Investments in fixed maturity securities (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of investments in securities with fixed maturities

Investments in fixed maturity securities as of December 31, 2022 and 2021 are summarized by type below (in millions).

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2022
U.S. Treasury, U.S. government corporations and agencies	$	10,039	$	12	$	(249	)	$	9,802
Foreign governments		10,454		50		(177	)		10,327
Corporate bonds		1,945		256		(6	)		2,195
Other		2,735		77		(8	)		2,804
	$	25,173	$	395	$	(440	)	$	25,128
December 31, 2021
U.S. Treasury, U.S. government corporations and agencies	$	3,286	$	22	$	(5	)	$	3,303
Foreign governments		10,998		29		(33	)		10,994
Corporate bonds		1,363		412		(1	)		1,774
Other		317		47		(1	)		363
	$	15,964	$	510	$	(40	)	$	16,434

Schedule of amortized cost and estimated fair value of securities with fixed maturities

The amortized cost and estimated fair value of fixed maturity securities at December 31, 2022 are summarized below by contractual maturity dates. Amounts are 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	$	7,720	$	13,413	$	1,393	$	842	$	1,805	$	25,173
Fair value		7,660		13,122		1,627		864		1,855		25,128