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Investments (Unconsolidated Variable Interest Entities - Narrative) (Details) - RMBS - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]          
Proceeds from securitization of loan held for investment carrying value     $ 443    
Proceeds from Securitizations of Loans Held-for-investment $ 0 $ 0 $ 467    
Gain (Loss) on Securitization of Financial Assets       $ 24  
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds         $ 131