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Payables and Other Liabilities - Repurchase Reserves (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Loans Subject to Repurchase Reserve [Roll Forward]        
Balance - beginning of period $ 29 $ 16 $ 25 $ 8
Provisions 4 8 9 16
Releases (4) (1) (5) (1)
Balance - end of period $ 29 $ 23 $ 29 $ 23