Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 137	$ 148
Liability Fair Value	34	181
Securities pledged
Derivatives, Fair Value [Line Items]
Net cash collateral	0	0
Fair value of securities delivered as collateral	123	161
Over the Counter \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Net cash collateral	17	11
Exchange Cleared \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Net cash collateral	21	74
Credit contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Maximum potential future net exposure on sale of credit default swaps	$ 5	497
Term of derivative	5 years
Credit contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 0	10
Liability Fair Value	$ 2	$ 6

The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

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Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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