David Lloyd Kreeger, one of Washington's greatest arts patrons, leaves an estate that includes $75 million of Geico stock alone. His attorney, Walter Freedman, said yesterday that it will be some time before the estate is settled, but, as Kreeger had confirmed recently, his Foxhall Road home will become a museum to house his painting and sculpture collection after his wife, Carmen Kreeger, no longer lives there. The house is considered one of architect Philip Johnson's masterpieces, and Kreeger left an endowment sufficient to open and maintain the museum.

Kreeger is also believed to have left a trust to pay several bequests of near $1 million each to the National Symphony Orchestra; the Washington Opera; and Rutgers, Harvard and American universities. Other gifts to several Washington cultural institutions are likely to be announced.

The Corcoran Gallery of Art may not be included in his largess, knowledgeable sources said, though it had been one of Kreeger's passions. In the months of controversy following the gallery's cancellation of the Robert Mapplethorpe photo retrospective, Kreeger worked hard to straighten out the troubled institution. When he resigned as chairman of the board in June, he was frustrated with the damage done to the Corcoran by the cancellation. "It's painful," he said, "because I love the Corcoran and I've been connected with it for 25 years."