Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ (1,504)	$ 887
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	15	15
DAC/VOBA and Sales inducements	355	(220)
Premium deficiency reserve adjustment	101	(35)
Change in unrealized gains/losses on available-for-sale securities	(1,033)	647
Available-for-sale securities, Income Tax:
Fixed maturities	315	(184)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(3)	(3)
DAC/VOBA and Sales inducements	(74)	46
Premium deficiency reserve adjustment	(21)	7
Change in unrealized gains/losses on available-for-sale securities	217	(134)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	(1,189)	703
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	12	12
DAC/VOBA and Sales inducements	281	(174)
Premium deficiency reserve adjustment	80	(28)
Change in unrealized gains/losses on available-for-sale securities	(816)	513
Derivatives, Before-Tax Amount:
Derivatives	79	(8)
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	73	(14)
Derivatives, Income Tax:
Derivatives	(17)	2
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	(16)	3
Derivatives, After-Tax Amount:
Derivatives	62	(6)
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	57	(11)
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	0
Change in pension and other postretirement benefits liability	0	0
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	0
Change in pension and other postretirement benefits liability	0	0
Other comprehensive income (loss), before tax	(960)	633
Change in Other comprehensive income (loss)	201	(131)
Other comprehensive income (loss), after tax	$ (759)	$ 502

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