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Fair Value Measurements - Significant Unobservable Inputs - Freestanding Derivatives (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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

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