Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale securities, Before-Tax Amount:
Net unrealized gains/losses on securities	$ (4,731)
Other		$ (1)	$ 2
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	62	(549)	8
DAC/VOBA	1,121	288	(302)
Premium deficiency reserve adjustment		434	(224)
Change in unrealized gains (losses) on available-for-sale securities	(3,548)	(584)	793
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	43	20	(17)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	11	5	(5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	54	25	(22)
Available-for-sale securities, Income Tax:
Net unrealized gains/losses on securities	993
Other		0	0
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	(13)	115	(2)
DAC/VOBA	(235)	(61)	63
Premium deficiency reserve adjustment		(91)	47
Change in unrealized gains (losses) on available-for-sale securities	745	123	(167)
Available-for-sale securities, After-Tax Amount:
Net unrealized gains/losses on securities	(3,738)
Other		(1)	2
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	49	(434)	6
DAC/VOBA	886	227	(239)
Premium deficiency reserve adjustment		343	(177)
Change in unrealized gains (losses) on available-for-sale securities	(2,803)	(461)	626
Derivatives, Before-Tax Amount:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	20	21	23
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	16	17	18
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	27	3	(35)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	34	4	(45)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	4	4	5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(7)	(1)	10
Pension and other post-employment benefit liability, Before-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Consolidated Statements of Operations		(1)	(1)
Change in pension and other postretirement benefits liability	0	(1)	(1)
Other comprehensive income (loss), before tax	(3,514)	(581)	747
Pension and other post-employment benefit liability, Income Tax:
Amortization of prior service cost recognized in Operating expenses in the Consolidated Statements of Operations		0	0
Change in pension and other postretirement benefits liability		0	0
Other comprehensive income (loss)	738	122	(157)
Pension and other post-employment benefit liability, After-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Consolidated Statements of Operations		(1)	(1)
Change in pension and other postretirement benefits liability		(1)	(1)
Other comprehensive income (loss), after tax	$ (2,776)	(459)	590
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Net unrealized gains/losses on securities		(756)	1,309
Available-for-sale securities, Income Tax:
Net unrealized gains/losses on securities		160	(275)
Available-for-sale securities, After-Tax Amount:
Net unrealized gains/losses on securities		$ (596)	$ 1,034