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Finance Receivables - Changes in Accretable Yield For Purchased Credit Impaired HFI and HFS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Real Estate Loans - Held for Sale    
Changes in accretable yield for purchased credit impaired finance receivables    
Balance at beginning of period $ 23 $ 27
Accretion (1) (2)
Transfer due to finance receivables sold 0 (3)
Balance at end of period 22 22
Finance receivable - Personal loan    
Changes in accretable yield for purchased credit impaired finance receivables    
Balance at beginning of period 46 39
Accretion (6) (15)
Reclassifications from nonaccretable difference 0 16
Balance at end of period $ 40 $ 40