Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ 4,087	$ 1,574	$ 1,331	$ 3,439
Impairments	0	1	0	2
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	8	(11)	37	6
DAC/VOBA	(1,009)	(350)	(417)	(848)
Premium deficiency reserve	(178)	(41)	(75)	(77)
Sales inducements and other intangibles	(86)	(45)	(28)	(93)
Change in unrealized gains/losses on available-for-sale securities	2,822	1,128	848	2,429
Available-for-sale securities, Income Tax:
Fixed maturities	(858)	(332)	(280)	(722)
Impairments		0		0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(2)	3	(8)	(1)
DAC/VOBA	212	73	88	178
Premium deficiency reserve	38	8	16	16
Sales inducements and other intangibles	18	10	6	20
Change in unrealized gains/losses on available-for-sale securities	(592)	(238)	(178)	(509)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	3,229	1,242	1,051	2,717
Impairments		1		2
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	6	(8)	29	5
DAC/VOBA	(797)	(277)	(329)	(670)
Premium deficiency reserve	(140)	(33)	(59)	(61)
Sales inducements and other intangibles	(68)	(35)	(22)	(73)
Change in unrealized gains/losses on available-for-sale securities	2,230	890	670	1,920
Derivatives, Before-Tax Amount:
Derivatives	(34)	21	62	11
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(6)	(7)	(12)	(13)
Change in unrealized gains/losses on derivatives	(40)	14	50	(2)
Derivatives, Income Tax:
Derivatives	7	(4)	(13)	(2)
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	9	(2)	(10)	1
Derivatives, After-Tax Amount:
Derivatives	(27)	17	49	9
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(4)	(5)	(9)	(10)
Change in unrealized gains/losses on derivatives	(31)	12	40	(1)
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)	(1)	(2)	(2)
Change in pension and other postretirement benefits liability	(1)	(1)	(2)	(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	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)	(1)	(2)	(2)
Change in pension and other postretirement benefits liability	(1)	(1)	(2)	(2)
Other comprehensive income (loss), before tax	2,781	1,141	896	2,425
Other comprehensive income (loss), tax	(583)	(240)	(188)	(508)
Other comprehensive income (loss), after tax	$ 2,198	$ 901	$ 708	$ 1,917

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