Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 235	$ 137
Liability Fair Value	341	34
Securities pledged
Derivatives, Fair Value [Line Items]
Net cash collateral	0	0
Fair value of securities delivered as collateral	113	123
Over the Counter \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Net cash collateral	7	17
Exchange Cleared \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Net cash collateral	55	21
Credit contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

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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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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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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