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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 482	$ 459	$ 1,636	$ 1,200
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in net unrealized gain on fixed maturities	(274)	376	(904)	747
Change in unrealized losses on fixed maturities for which an allowance for credit losses has been recorded	0	0	0	1
Changes in net gain on cash flow hedging instruments	1	(17)	1	22
Change in foreign currency translation adjustments	(4)	6	(1)	(1)
Changes in pension and other postretirement plan adjustments	(14)	(12)	(41)	(35)
Other comprehensive income (loss), net of tax	(263)	377	(863)	804
Comprehensive income	$ 219	$ 836	$ 773	$ 2,004

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