Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Available-for-sale securities, Before-Tax Amount:
Other	$ (5)	$ 0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	14	19
DAC/VOBA and Sales inducements	194	(33)
Premium deficiency reserve adjustment	33	(5)
Change in unrealized gains/losses on available-for-sale securities	(444)	96
Available-for-sale securities, Income Tax:
Other	1	0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(3)	(7)
DAC/VOBA and Sales inducements	(41)	12
Premium deficiency reserve adjustment	(7)	2
Change in unrealized gains/losses on available-for-sale securities	102	(33)
Available-for-sale securities, After-Tax Amount:
Other	(4)	0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	11	12
DAC/VOBA and Sales inducements	153	(21)
Premium deficiency reserve adjustment	26	(3)
Change in unrealized gains/losses on available-for-sale securities	(342)	63
OTTI:
Other-than-temporary impairments	7	2
OTTI	(1)	(1)
OTTI	6	1
Derivatives, Before-Tax Amount:
Derivatives	(25)	(9)
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	(31)	(15)
Derivatives, Income Tax:
Derivatives	5	3
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1	2
Change in unrealized gains/losses on derivatives	6	5
Derivatives, After-Tax Amount:
Derivatives	(20)	(6)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(5)	(4)
Change in unrealized gains/losses on derivatives	(25)	(10)
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
Change in pension and other postretirement benefits liability	(1)	0
Other comprehensive income (loss), before tax	(476)	81
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
Change in Other comprehensive income (loss)	108	(28)
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
Change in pension and other postretirement benefits liability	(1)	0
Other comprehensive income (loss), after tax	(368)	53
Income Tax Valuation Allowance	11	0
Fixed maturities
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	(687)	113
Available-for-sale securities, Income Tax:
Fixed maturities	153	(39)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	(534)	74
Equity securities
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	0	0
Available-for-sale securities, Income Tax:
Fixed maturities	0	0
Available-for-sale securities, After-Tax Amount:
Fixed maturities	$ 0	$ 0

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