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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]        
Loans and Leases Receivable, Allowance $ 5,942 $ 5,738 $ 6,427 $ 5,574
Interest and fees on loans (Note 4) 4,687 4,172    
Provision for loan losses 859 1,362    
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Loans and Leases Receivable, Allowance 1,600   1,700  
Interest and fees on loans (Note 4) 1,200 1,200    
Provision for loan losses 188 316    
Interest on borrowings of consolidated securitization entities 100 $ 74    
Other Assets [Member] | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Restricted Cash Equivalents $ 68   $ 803