Investments in fixed maturity securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments Debt And Equity Securities [Abstract]

Schedule of investments in securities with fixed maturities

Investments in fixed maturity securities as of September 30, 2020 and December 31, 2019 are summarized by type below (in millions).

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
September 30, 2020
U.S. Treasury, U.S. government corporations and agencies	$	3,311	$	66	$	—		$	3,377
Foreign governments		9,898		82		(11	)		9,969
Corporate bonds		5,125		455		(6	)		5,574
Other		447		70		(2	)		515
	$	18,781	$	673	$	(19	)	$	19,435
December 31, 2019
U.S. Treasury, U.S. government corporations and agencies	$	3,054	$	37	$	(1	)	$	3,090
Foreign governments		8,584		63		(9	)		8,638
Corporate bonds		5,896		459		(3	)		6,352
Other		539		67		(1	)		605
	$	18,073	$	626	$	(14	)	$	18,685

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 September 30, 2020 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	$	9,847	$	7,885	$	302	$	405	$	342	$	18,781
Fair value		9,887		8,030		349		764		405		19,435