Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 887	$ (687)
Other	0	(5)
Other-than-temporary impairments	0	7
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	15	14
DAC/VOBA and Sales inducements	(220)	194
Premium deficiency reserve adjustment	(35)	33
Change in unrealized gains/losses on available-for-sale securities	647	(444)
Available-for-sale securities, Income Tax:
Fixed maturities	(184)	153
Other	0	1
OTTI	0	(1)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(3)	(3)
DAC/VOBA and Sales inducements	46	(41)
Premium deficiency reserve adjustment	7	(7)
Change in unrealized gains/losses on available-for-sale securities	(134)	102
Available-for-sale securities, After-Tax Amount:
Fixed maturities	703	(534)
Other	0	(4)
OTTI	0	6
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	12	11
DAC/VOBA and Sales inducements	(174)	153
Premium deficiency reserve adjustment	(28)	26
Change in unrealized gains/losses on available-for-sale securities	513	(342)
Derivatives, Before-Tax Amount:
Derivatives	(8)	(25)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(6)	(6)
Change in unrealized gains/losses on derivatives	(14)	(31)
Derivatives, Income Tax:
Derivatives	2	5
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1	1
Change in unrealized gains/losses on derivatives	3	6
Derivatives, After-Tax Amount:
Derivatives	(6)	(20)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5)	(5)
Change in unrealized gains/losses on derivatives	(11)	(25)
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)
Change in pension and other postretirement benefits liability	0	(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
Change in pension and other postretirement benefits liability	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)
Change in pension and other postretirement benefits liability	0	(1)
Other comprehensive income (loss), before tax	633	(476)
Change in Other comprehensive income (loss)	(131)	108
Other comprehensive income (loss), after tax	502	(368)
Income Tax Valuation Allowance	$ 0	$ 11

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