Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Collateralized financings	$ 540	$ 474
Derivative Asset, Fair Value, Gross Asset	210	335
Liability Fair Value	203	563
Securities pledged
Derivatives, Fair Value [Line Items]
Collateralized financings	0	0
Fair value of securities delivered as collateral	180	183
Credit contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Maximum potential future net exposure on sale of credit default swaps	0
Purchased protection on credit default swaps	$ 0
Derivative, term of contract	5 years
Credit contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0	0
Liability Fair Value	3	2
Over the Counter \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Collateralized financings	27	9
Cleared Derivative Contract \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Collateralized financings	16	82
Held for sale
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	140	312
Liability Fair Value	161	369
Held for sale \| Securities pledged
Derivatives, Fair Value [Line Items]
Collateralized financings	11	18
Fair value of securities delivered as collateral	6	2
Held for sale \| Credit contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Liability Fair Value	0	0
Held for sale \| Over the Counter \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Collateralized financings	64	213
Held for sale \| Cleared Derivative Contract \| Payables under securities loan agreement, including collateral held
Derivatives, Fair Value [Line Items]
Collateralized financings	$ 0	$ 0

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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- Definition

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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- Definition

Amount of purchased credit protection expected to cover future payments under the credit risk derivative.

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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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- Definition

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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- Definition

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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