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Investments Investments (Variable Interest Entities - Narrative) (Details) - RMBS - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Variable Interest Entity [Line Items]      
Proceeds from securitization of Loans Held for Investments Carry Value $ 451 $ 443 $ 451
Proceeds from Securitizations of Loans Held-for-investment 478 467 478
Gain (Loss) on Securitization of Financial Assets 27 24 27
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds $ 102 $ 136 $ 102