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Finance Receivables - Purchased Credit Impaired Finance Receivables HFI (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Real Estate Loans - Held for Sale    
Financing Receivable, Impaired [Line Items]    
Carrying amount, net of allowance   $ 19
Outstanding balance   35
Finance receivable - Personal loan    
Financing Receivable, Impaired [Line Items]    
Carrying amount, net of allowance   40
Outstanding balance   74
Allowance for purchased credit impaired finance receivable losses $ 0 $ 0