Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, net of OTTI	$ 2,211		$ 312
Derivatives(1)	159		117
DAC/VOBA and Sales inducements adjustment on available-for-sale securities	(593)		(114)
Premium deficiency reserve adjustment	(216)		(58)
Unrealized capital gains (losses), before tax	1,561		257
Deferred income tax asset (liability)	(199)		(59)
Unrealized capital gains (losses), after tax	1,362		198
Pension and other postretirement benefits liability, net of tax	4		3
AOCI	1,366	$ 108	$ 201
Other Contract
Debt Securities, Available-for-sale [Line Items]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ 25

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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- Definition

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
-Publisher FASB
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-Topic 220
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, Value Of Business Acquired (VOBA) Adjustment and Sales Inducements On Available For Sale Securities

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Accumulated Other Comprehensive Income (Loss), Premium Deficiency Reserve, Adjustment for Available-for-sale Securities

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

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