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Fair Value Measurements - Significant Unobservable Inputs - Freestanding Derivatives (Details) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Significant Unobservable Inputs (Level 3)
Fair Value Inputs and Valuation Techniques
Derivative Assets (Liabilities), at Fair Value, Net	$ 1
Equity options
Fair Value Inputs and Valuation Techniques
Derivative Assets (Liabilities), at Fair Value, Net		$ (15)
Equity options | Minimum | Measurement Input, Option Volatility [Member]
Fair Value Inputs and Valuation Techniques
Derivative Asset (Liability) Net, Measurement Input		0.13
Equity options | Maximum | Measurement Input, Option Volatility [Member]
Fair Value Inputs and Valuation Techniques
Derivative Asset (Liability) Net, Measurement Input		0.28
Equity options | Weighted Average Expected Life | Measurement Input, Option Volatility [Member]
Fair Value Inputs and Valuation Techniques
Derivative Asset (Liability) Net, Measurement Input		0.17

X

- Definition

Value of input used to measure net derivative asset (liability).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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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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