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Investments Investments (Variable Interest Entities - Narrative) (Details) - RMBS
$ in Millions
3 Months Ended
Jun. 30, 2019
USD ($)
Variable Interest Entity [Line Items]  
Proceeds from securitization of Loans Held for Investments Carry Value $ 443
Proceeds from Securitizations of Loans Held-for-investment 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 $ 133