Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 687	$ (377)	$ 1,574	$ (1,064)
Other	0	0	0	(5)
Other-than-temporary impairments	1	0	1	7
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(2)	19	13	33
DAC/VOBA and Sales inducements	(166)	93	(386)	287
Premium deficiency reserve adjustment	(32)	21	(67)	54
Change in unrealized gains/losses on available-for-sale securities	488	(244)	1,135	(688)
Available-for-sale securities, Income Tax:
Fixed maturities	(145)	71	(329)	224
Other	0	0	0	1
OTTI	0	0	0	(1)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	0	(4)	(3)	(7)
DAC/VOBA and Sales inducements	35	(19)	81	(60)
Premium deficiency reserve adjustment	7	(4)	14	(11)
Change in unrealized gains/losses on available-for-sale securities	(103)	44	(237)	146
Available-for-sale securities, After-Tax Amount:
Fixed maturities	542	(306)	1,245	(840)
Other	0	0	0	(4)
OTTI	1	0	1	6
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(2)	15	10	26
DAC/VOBA and Sales inducements	(131)	74	(305)	227
Premium deficiency reserve adjustment	(25)	17	(53)	43
Change in unrealized gains/losses on available-for-sale securities	385	(200)	898	(542)
Derivatives, Before-Tax Amount:
Derivatives	17	32	9	7
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(6)	(6)	(12)	(12)
Change in unrealized gains/losses on derivatives	11	26	(3)	(5)
Derivatives, Income Tax:
Derivatives	(4)	(6)	(2)	(1)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	2	2	3	3
Change in unrealized gains/losses on derivatives	(2)	(4)	1	2
Derivatives, After-Tax Amount:
Derivatives	13	26	7	6
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	9	22	(2)	(3)
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	(1)	0	(1)	(1)
Change in pension and other postretirement benefits liability	(1)	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	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	(1)	0	(1)	(1)
Change in pension and other postretirement benefits liability	(1)	0	(1)	(1)
Other comprehensive income (loss), before tax	498	(218)	1,131	(694)
Change in Other comprehensive income (loss)	(105)	40	(236)	148
Other comprehensive income (loss), after tax	$ 393	$ (178)	$ 895	(546)
Income Tax Valuation Allowance				$ 6

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