Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Securities held as collateral	$ 432	$ 540
Fair value of credit default swaps included in Derivatives assets	469	273
Fair value of credit default swaps included in Derivatives liabilities	778	286
Securities pledged as collateral
Derivatives, Fair Value [Line Items]
Securities held as collateral	14	11
Securities delivered as collateral	171	187
Not Designated as Hedging Instrument \| Derivatives \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Fair value of credit default swaps included in Derivatives assets	0	0
Fair value of credit default swaps included in Derivatives liabilities	2	3
Over the counter \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	154	91
Cleared derivative contract \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	$ 163	$ 16

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 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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