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Fair Value Measurements - Significant Unobservable Inputs Freestanding Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
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    
Equity options      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Derivative Assets (Liabilities), at Fair Value, Net $ (5) $ (5) $ 3
Interest rate swaptions [3]      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Derivative Assets (Liabilities), at Fair Value, Net     $ 1
Interest rate swaptions [3] | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve     3.00%
Interest rate swaptions [3] | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve     3.00%
Interest rate swaptions [3] | Weighted Average [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve     3.00%
Measurement Input, Option Volatility [Member] | Equity options | Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   11.00% 19.00%
Measurement Input, Option Volatility [Member] | Equity options | Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   25.00% 21.00%
Measurement Input, Option Volatility [Member] | Equity options | Weighted Average [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair Value Measurements, Unobservable Swap_Curve   15.00% 20.00%