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Fair Value Measurements - Significant Unobservable Inputs Freestanding Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Equity securities, at fair value $ 1,275 $ 1,214
Derivative liabilities (64) (68)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs 0  
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%
Equity Options    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Derivative Assets (Liabilities), at Fair Value, Net $ 1 $ 3
Equity Options | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Fair Value Measurements, Unobservable Swap_Curve   19.00%
Equity Options | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Fair Value Measurements, Unobservable Swap_Curve   21.00%
Equity Options | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)    
Fair Value Measurements, Unobservable Swap_Curve   20.00%
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 12.00%  
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 20.00%  
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 18.00%