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Loans and Interest Receivable - Loans and Interest Receivables by FICO Score (Details) - Consumer Receivables - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Consumer loans and interest receivable $ 6,401 $ 4,996
Greater Than 760    
Financing Receivable, Recorded Investment [Line Items]    
Consumer loans and interest receivable 832 665
680-759    
Financing Receivable, Recorded Investment [Line Items]    
Consumer loans and interest receivable 2,439 1,938
600-679    
Financing Receivable, Recorded Investment [Line Items]    
Consumer loans and interest receivable 2,378 1,840
Less Than 599    
Financing Receivable, Recorded Investment [Line Items]    
Consumer loans and interest receivable $ 752 $ 553