Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale securities, Before-Tax Amount:
Net unrealized gains/losses on securities	$ (756)
Other	(1)	$ 2	$ 0
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	(549)	8	(11)
DAC/VOBA and Sales inducements	288	(302)	(479)
Premium deficiency reserve adjustment	434	(224)	(160)
Change in unrealized gains (losses) on available-for-sale securities	(584)	793	1,346
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	20	(17)	1
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	5	(5)	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	25	(22)	1
Available-for-sale securities, Income Tax:
Net unrealized gains/losses on securities	160
Other	0	0	0
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	115	(2)	2
DAC/VOBA and Sales inducements	(61)	63	100
Premium deficiency reserve adjustment	(91)	47	33
Change in unrealized gains (losses) on available-for-sale securities	123	(167)	(284)
Available-for-sale securities, After-Tax Amount:
Net unrealized gains/losses on securities	(596)
Other	(1)	2	0
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	(434)	6	(9)
DAC/VOBA and Sales inducements	227	(239)	(379)
Premium deficiency reserve adjustment	343	(177)	(127)
Change in unrealized gains (losses) on available-for-sale securities	(461)	626	1,062
Derivatives, Before-Tax Amount:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	21	23	23
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	17	18	18
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	3	(35)	(17)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	4	(45)	(22)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	4	5	5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(1)	10	5
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)	(1)
Change in pension and other postretirement benefits liability	(1)	(1)	(1)
Other comprehensive income (loss), before tax	(581)	747	1,323
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	3
Change in pension and other postretirement benefits liability	0	0	3
Other comprehensive income (loss)	122	(157)	(276)
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)	2
Change in pension and other postretirement benefits liability	(1)	(1)	2
Other comprehensive income (loss), after tax	$ (459)	590	1,047
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Net unrealized gains/losses on securities		1,309	1,996
Available-for-sale securities, Income Tax:
Net unrealized gains/losses on securities		(275)	(419)
Available-for-sale securities, After-Tax Amount:
Net unrealized gains/losses on securities		$ 1,034	$ 1,577