Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 540	$ (124)	$ 2,114	$ (1,188)
Other	0	0	0	(5)
Other-than-temporary impairments	0	1	1	8
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(44)	9	(31)	42
DAC/VOBA and Sales inducements	(134)	31	(520)	318
Premium deficiency reserve adjustment	(98)	3	(165)	57
Change in unrealized gains/losses on available-for-sale securities	264	(80)	1,399	(768)
Available-for-sale securities, Income Tax:
Fixed maturities	(115)	35	(444)	259
Other	0	0	0	1
OTTI	0	(1)	0	(2)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	10	(2)	7	(9)
DAC/VOBA and Sales inducements	28	(7)	109	(67)
Premium deficiency reserve adjustment	21	(1)	35	(12)
Change in unrealized gains/losses on available-for-sale securities	(56)	24	(293)	170
Available-for-sale securities, After-Tax Amount:
Fixed maturities	425	(89)	1,670	(929)
Other	0	0	0	(4)
OTTI	0	0	1	6
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(34)	7	(24)	33
DAC/VOBA and Sales inducements	(106)	24	(411)	251
Premium deficiency reserve adjustment	(77)	2	(130)	45
Change in unrealized gains/losses on available-for-sale securities	208	(56)	1,106	(598)
Derivatives, Before-Tax Amount:
Derivatives	27	4	36	11
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5)	(6)	(17)	(18)
Change in unrealized gains/losses on derivatives	22	(2)	19	(7)
Derivatives, Income Tax:
Derivatives	(6)	(1)	(8)	(2)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1	1	4	4
Change in unrealized gains/losses on derivatives	(5)	0	(4)	2
Derivatives, After-Tax Amount:
Derivatives	21	3	28	9
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(4)	(5)	(13)	(14)
Change in unrealized gains/losses on derivatives	17	(2)	15	(5)
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)	(1)	(2)
Change in pension and other postretirement benefits liability	0	(1)	(1)	(2)
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	1	0	1	0
Change in pension and other postretirement benefits liability	1	0	1	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	(1)	0	(2)
Change in pension and other postretirement benefits liability	1	(1)	0	(2)
Other comprehensive income (loss), before tax	286	(83)	1,417	(777)
Change in Other comprehensive income (loss)	(60)	24	(296)	172
Other comprehensive income (loss), after tax	$ 226	$ (59)	$ 1,121	(605)
Income Tax Valuation Allowance				$ 12

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