Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Fixed maturities, net of OTTI	$ 5,827		$ 1,486
Derivatives	195		142
DAC/VOBA adjustment on available-for-sale securities	(1,593)		(482)
Premium deficiency reserve	(257)		(109)
Sales inducements and other intangibles adjustment on available-for-sale securities	(204)		(82)
Unrealized capital gains (losses), before tax	3,968		955
Deferred income tax asset (liability)	(479)		(186)
Net unrealized capital gains (losses)	3,489		769
Pension and other postretirement benefits liability, net of tax	8		8
AOCI	3,497	$ 607	$ 777
Other Contract
Accumulated Other Comprehensive Income (Loss) [Line Items]
Portion of AOCI expected to be reclassified into earnings within next 12 months	$ 27

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Other than Temporary Impairment, before Tax

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Derivatives, Effect before Tax

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Accumulated Other Comprehensive Income (Loss), Deferred Acquisition Costs and Value Of Business Acquired (VOBA), Available for Sale Securities Adjustment, before Tax

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Accumulated Other Comprehensive Income (Loss), Premium Deficiency Reserve

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Accumulated Other Comprehensive Income (Loss), Tax Expense (Benefit)

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Accumulated Other Comprehensive Income (Loss), Unrealized Capital Gains (Losses), Adjustment, before Tax

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Accumulated Other Comprehensive Income (Loss), Unrealized Capital Gains (Losses), Adjustment, Net of Tax

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