Investments in fixed maturity securities (Tables)

6 Months Ended

Jun. 30, 2021

Investments Debt And Equity Securities [Abstract]

Schedule of investments in securities with fixed maturities

Investments in fixed maturity securities as of June 30, 2021 and December 31, 2020 are summarized below (in millions).

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
June 30, 2021
U.S. Treasury, U.S. government corporations and agencies	$	3,435	$	37	$	(1	)	$	3,471
Foreign governments		12,635		79		(10	)		12,704
Corporate bonds		3,426		452		(1	)		3,877
Other		352		57		(1	)		408
	$	19,848	$	625	$	(13	)	$	20,460
December 31, 2020
U.S. Treasury, U.S. government corporations and agencies	$	3,348	$	55	$	—		$	3,403
Foreign governments		11,233		110		(5	)		11,338
Corporate bonds		4,729		464		(2	)		5,191
Other		414		66		(2	)		478
	$	19,724	$	695	$	(9	)	$	20,410

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

The amortized cost and estimated fair value of fixed maturity securities as of June 30, 2021 are summarized below by contractual maturity dates (in millions). Actual maturities may differ from contractual maturities due to early call or 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	$	9,331	$	9,561	$	433	$	257	$	266	$	19,848
Fair value		9,383		9,645		657		458		317		20,460