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Fair Value Measurements - Significant Unobservable Inputs Freestanding Derivatives (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs $ 0    
Fair Value, Inputs, Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Derivative Assets (Liabilities), at Fair Value, Net $ 1,000,000    
Equity options      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Derivative Assets (Liabilities), at Fair Value, Net     $ (15,000,000)
Equity options | Measurement Input, Option Volatility [Member] | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   13.00%  
Equity options | Measurement Input, Option Volatility [Member] | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   28.00%  
Equity options | Measurement Input, Option Volatility [Member] | Weighted Average [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   17.00%