Investments in fixed maturity securities are summarized as follows (in millions).


	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
June 30, 2025
U.S. Treasury, U.S. government corporations and agencies	$	3,845	$	13	$	(1	)	$	3,857
Foreign governments		9,674		86		(24	)		9,736
Corporate and other		1,257		237		(3	)		1,491
	$	14,776	$	336	$	(28	)	$	15,084
December 31, 2024
U.S. Treasury, U.S. government corporations and agencies	$	4,447	$	16	$	(4	)	$	4,459
Foreign governments		9,443		16		(97	)		9,362
Corporate and other		1,324		225		(6	)		1,543
	$	15,214	$	257	$	(107	)	$	15,364

As of June 30, 2025, approximately 93% of our foreign government holdings were rated AA or higher by at least one of the major rating agencies. The amortized cost and estimated fair value of fixed maturity securities at June 30, 2025 are summarized below by contractual maturity dates (in millions). Actual maturities may differ from contractual maturities due to prepayment rights held by issuers.


	Due in one year or less		Due after one year through five years		Due after five years through ten years		Due after ten years		Mortgage- backed securities		Total
Amortized cost	$	11,145	$	2,814	$	586	$	116	$	115	$	14,776
Fair value		11,262		2,788		779		127		128		15,084