Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Securities held as collateral	$ 368	$ 474
Securities pledged as collateral
Derivatives, Fair Value [Line Items]
Securities held as collateral	7	0
Securities delivered as collateral	210	183
Over the counter \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	106	9
Cleared derivative contract \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	292	82
Discontinued Operations, Held-for-sale \| Securities pledged as collateral
Derivatives, Fair Value [Line Items]
Securities held as collateral	9	18
Securities delivered as collateral	2	2
Discontinued Operations, Held-for-sale \| Over the counter \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	75	213
Discontinued Operations, Held-for-sale \| Cleared derivative contract \| Cash collateral, included in Payables
Derivatives, Fair Value [Line Items]
Securities held as collateral	$ 1	$ 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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 25
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109249708&loc=d3e113275-111724

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

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