The Reagan administration agreed yesterday to give congressional and Philippine investigators copies of 1,500 sensitive documents brought to Hawaii by Ferdinand Marcos and considered crucial to recouping the hidden wealth amassed abroad by the deposed president.

Copies of the documents -- which senior administration officials described as a road map for investigators trying to unravel a Marcos fortune estimated as high as $10 billion -- will be given to Rep. Stephen J. Solarz (D-N.Y.), who had threatened to subpoena the records, according to administration sources. Solarz said he expects to receive the documents by the end of this week.

Additional copies will be given to Jovita R. Salonga, chairman of a Philippine government commission formed to track Marcos' allegedly ill-gotten wealth. Salonga, who left Manila yesterday, will be given copies of the documents when he arrives in Washington next week, the sources said.

Solarz and the new Philippine government believe the documents contain "smoking-gun" evidence linking Marcos to vast real estate holdings in New York and elsewhere -- documents crucial to U.S. court challenges being brought by the government of Corazon Aquino in an effort to recover Marcos' wealth.

In other developments yesterday:

*The Aquino government empowered a commission to freeze assets and property of Marcos, his family and associates, including bank and trust accounts, stocks, condominiums, mansions, correspondent Jonathan C. Randal reported from Manila. Other governments were asked to enact similar freezes of Marcos' holdings. Also, sources said assets of Marcos associates Roland C. Gapud and Jose Campos were ordered seized in Manila after documents discovered there identified them as Marcos' "nominees" in several ventures.

*Salonga's commission has been auditing the records of the government-owned Philippine National Oil Co. following allegations that former Energy Minister Geronimo Velasco, who fled the country, inflated oil tanker shipping charges and passed some of the excess to Marcos, sources in Manila said.

*In Washington, Deputy Assistant Secretary of Defense James Kelly told a House panel that in Marcos' first week in exile, the United States spent $200,000 to fly him and his party from the Malacanang Palace to Hawaii, $150,000 to pay military personnel guarding them, $87,000 to cover their bills at military base stores and other purchases, and $500 a day for Marcos' international phone calls.

*Rep. David R. Obey (D-Wis.), chairman of a House Appropriations subcommittee, said he is investigating whether the Marcos government misused $45 million in U.S. aid that was converted into Philippine pesos and deposited in the Central Bank of the Philippines last December. Officials of the U.S. Agency for International Development promised to trace the money, which amounts to half of the annual AID economic support budget for the Philippines.

*In Hawaii last night, it appeared that Marcos would be leaving Hickam Air Force Base. Secret Service agents inspected a house bordering the Waialae Golf and Country Club in Honolulu's Kahala neighborhood, apparently in preparation for the arrival of Marcos and his wife, Imelda. The $620,000 house, owned by a Fresno, Calif., businessman, was reportedly rented by Marcos' daughter, Irene Araneta, and her husband, Gregorio, last week; a source close to the Marcos party indicated the move would be a temporary one.

The decision to give Solarz and Salonga copies of the Marcos documents came one day after Solarz threatened to subpoena the records and to hold U.S. Customs Service Commissioner William von Raab in contempt of Congress unless he delivered them.

U.S. government officials had said that releasing the records might compromise Marcos' privacy and jeopardize future federal investigations of financial dealings by Marcos and his associates.

An administration official emphasized that "purely personal" documents, such as birth certificates and "love letters," would not be released to Solarz and Salonga.

Salonga arrived in Hawaii yesterday, reportedly carrying documents to be submitted in U.S. court cases through which the Aquino government hopes to seize Marcos holdings. Salonga was to meet senior U.S. officials early next week, after talking with Filipino exiles and government lawyers in California.

"We need the Hawaii documents very badly to make sure Marcos' assets aren't dissipated," said Michael Rattner, one of the Aquino government's lawyers. Rattner said he feared Marcos and others already may have liquidated some holdings in the time since they evacuated Manila.

Solarz, whose subcommittee earlier heard testimony linking the Marcoses to $350 million worth of prime New York real estate, said he has instructed the General Accounting Office and his staff to review the documents on a "crash basis" once they are delivered. He said he also expects to get copies of some Salonga documents.

"I've always suspected that the real estate empire in the New York area is but the tip of the iceberg," Solarz said. "I would be surprised if we didn't find some fairly incriminating information in terms of hidden wealth in the United States."

Official government spokesmen would not confirm the impending release of the documents.

"We are really not in a position to comment on Congressman Solarz's statements," Customs spokesman Dennis Murphy said.

Kelly's testimony in Congress about the Marcos party's expenses prompted Rep. Matthew F. McHugh (D-N.Y.), to complain that the deposed leader may be taking advantage of American hospitality. McHugh said future U.S. presidents may not be so willing to invite ousted heads-of-state to come here.

"I hope and expect our government will ask Mr. Marcos to reimburse our government for expenses," McHugh said after the hearing.

AID assistant administrator Charles Greenleaf told Obey's panel that $45 million of Economic Support Fund monies were converted into pesos in the weeks before the Philippine election.

Marcos fled Manila with more than $1 million in pesos, according to the Customs Service, but there was no evidence that money was tied to the AID funds.