Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 376	$ 540	$ 873	$ 2,114
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	4	(44)	20	(31)
DAC/VOBA and Sales inducements	(99)	(134)	(286)	(520)
Premium deficiency reserve adjustment	(144)	(98)	(213)	(165)
Change in unrealized gains/losses on available-for-sale securities	137	264	394	1,399
Available-for-sale securities, Income Tax:
Fixed maturities	(80)	(115)	(184)	(444)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(1)	10	(4)	7
DAC/VOBA and Sales inducements	21	28	60	109
Premium deficiency reserve adjustment	31	21	45	35
Change in unrealized gains/losses on available-for-sale securities	(29)	(56)	(83)	(293)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	296	425	689	1,670
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	3	(34)	16	(24)
DAC/VOBA and Sales inducements	(78)	(106)	(226)	(411)
Premium deficiency reserve adjustment	(113)	(77)	(168)	(130)
Change in unrealized gains/losses on available-for-sale securities	108	208	311	1,106
Derivatives, Before-Tax Amount:
Derivatives	(36)	27	27	36
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(6)	(5)	(17)	(17)
Change in unrealized gains/losses on derivatives	(42)	22	10	19
Derivatives, Income Tax:
Derivatives	7	(6)	(6)	(8)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	2	1	4	4
Change in unrealized gains/losses on derivatives	9	(5)	(2)	(4)
Derivatives, After-Tax Amount:
Derivatives	(29)	21	21	28
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(4)	(4)	(13)	(13)
Change in unrealized gains/losses on derivatives	(33)	17	8	15
Pension and other post-employment benefit liability, Before-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	0	0	0	(1)
Change in pension and other postretirement benefits liability	0	0	(1)	(1)
Pension and other post-employment benefit liability, Income Tax:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	0	1	0	1
Change in pension and other postretirement benefits liability	0	1	0	1
Pension and other post-employment benefit liability, After-Tax Amount:
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	0	1	0	0
Change in pension and other postretirement benefits liability	0	1	(1)	0
Other comprehensive income (loss), before tax	95	286	403	1,417
Change in Other comprehensive income (loss)	(20)	(60)	(85)	(296)
Other comprehensive income (loss), after tax	75	226	318	1,121
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent	$ 0	0	$ 0	1
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent		0		0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent		$ 0		$ 1

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