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Investments (Variable Interest Entities - Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]      
Financial or other support to investees designated as VIEs $ 0 $ 0 $ 0
Proceeds From Securitizations of Loans Held-for-Investment, Carry Value 443 451  
Proceeds from Securitizations of Loans Held-for-investment 467 478  
Gain (Loss) on Securitization of Financial Assets 24 27  
RMBS      
Variable Interest Entity [Line Items]      
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds $ 131 $ 98