Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 2,001	$ 687	$ 497	$ 1,574
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	1	(2)	16	13
DAC/VOBA and Sales inducements	(542)	(166)	(187)	(386)
Premium deficiency reserve adjustment	(170)	(32)	(69)	(67)
Change in unrealized gains/losses on available-for-sale securities	1,290	488	257	1,135
Available-for-sale securities, Income Tax:
Fixed maturities	(419)	(145)	(104)	(329)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	0	0	(3)	(3)
DAC/VOBA and Sales inducements	113	35	39	81
Premium deficiency reserve adjustment	35	7	14	14
Change in unrealized gains/losses on available-for-sale securities	(271)	(103)	(54)	(237)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	1,582	542	393	1,245
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	1	(2)	13	10
DAC/VOBA and Sales inducements	(429)	(131)	(148)	(305)
Premium deficiency reserve adjustment	(135)	(25)	(55)	(53)
Change in unrealized gains/losses on available-for-sale securities	1,019	385	203	898
Derivatives, Before-Tax Amount:
Derivatives	(16)	17	63	9
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5)	(6)	(11)	(12)
Change in unrealized gains/losses on derivatives	(21)	11	52	(3)
Derivatives, Income Tax:
Derivatives	4	(4)	(13)	(2)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1	2	2	3
Change in unrealized gains/losses on derivatives	5	(2)	(11)	1
Derivatives, After-Tax Amount:
Derivatives	(12)	13	50	7
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(4)	(4)	(9)	(9)
Change in unrealized gains/losses on derivatives	(16)	9	41	(2)
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	(1)	0	(1)
Change in pension and other postretirement benefits liability	(1)	(1)	(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	0	0	0
Change in pension and other postretirement benefits liability	0	0	0	0
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	(1)
Change in pension and other postretirement benefits liability	(1)	(1)	(1)	(1)
Other comprehensive income (loss), before tax	1,268	498	308	1,131
Change in Other comprehensive income (loss)	(266)	(105)	(65)	(236)
Other comprehensive income (loss), after tax	1,002	393	243	895
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent	$ 0	1	$ 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		$ (1)		$ 1

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