American International Group Inc.’s trading partners may force the insurer to bear the risk of losses on corporate loans and mortgages for years beyond the company’s expectations, complicating U.S. efforts to stabilize the firm, analysts said.

European banks including Societe Generale SA and BNP Paribas SA hold almost $200 billion in guarantees sold by New York-based AIG allowing the lenders to reduce the capital required for loss reserves. The firms may keep the contracts to hedge against declining assets rather than canceling them as AIG said it expects the banks to do, according to David Havens, managing director at investment bank Hexagon Securities.