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	$ (2,756)	$ 1,865
Impairments	0	1
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	29	17
DAC/VOBA	592	(498)
Premium deficiency reserve	103	(36)
Sales inducements and other intangibles	58	(48)
Change in unrealized gains/losses on available-for-sale securities	(1,974)	1,301
Available-for-sale securities, Income Tax:
Fixed maturities	578	(390)
Impairments	0	0
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(6)	(4)
DAC/VOBA	(124)	105
Premium deficiency reserve	(22)	8
Sales inducements and other intangibles	(12)	10
Change in unrealized gains/losses on available-for-sale securities	414	(271)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	(2,178)	1,475
Impairments	0	1
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	23	13
DAC/VOBA	468	(393)
Premium deficiency reserve	81	(28)
Sales inducements and other intangibles	46	(38)
Change in unrealized gains/losses on available-for-sale securities	(1,560)	1,030
Derivatives, Before-Tax Amount:
Derivatives	96	(10)
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	90	(16)
Derivatives, Income Tax:
Derivatives	(20)	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	(19)	3
Derivatives, After-Tax Amount:
Derivatives	76	(8)
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	71	(13)
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)
Change in pension and other postretirement benefits liability	(1)	(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	(1)	(1)
Change in pension and other postretirement benefits liability	(1)	(1)
Other comprehensive income (loss), before tax	(1,885)	1,284
Other comprehensive income (loss), tax	395	(268)
Other comprehensive income (loss), after tax	$ (1,490)	$ 1,016

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Amount before tax of other than temporary impairment (OTTI) loss on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss.

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