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Loans Held for Sale - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     $ 715 $ 1,809  
Transfer of loans to held for sale, net     1,253 1,588 $ 1,850
Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     648 844  
Valuation allowance     10 55  
Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     67 965  
Valuation allowance     5 57  
Commercial Loans - Fair Value Option [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     471 725  
Commercial Loans - Transferred to Held for Sale [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     62 102  
Commercial Real Estate [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     115 17  
Loans held for sale, sold, unpaid principal balance       1,161  
Gain (loss) on sale of loans held for sale       (3)  
Loans transferred to held for investment       612  
Residential Mortgage [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     6 890  
Lower of amortized cost or fair value adjustment attributed to non-credit factors       45  
Transfer of loans to held for sale, unpaid principal balance       568  
Transfer of loans to held for sale, net       473  
Loans held for sale, sold, unpaid principal balance $ 364        
Loans held for sale, sold, at aggregate carrying value 276        
Gain (loss) on sale of loans held for sale $ (2)        
Residential Mortgage And Home Equity [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfer of loans to held for sale, unpaid principal balance       648  
Transfer of loans to held for sale, net       628  
Lower of cost or fair value adjustment attributed to credit factors     (1)    
Loans held for sale, sold, unpaid principal balance     581    
Loans held for sale, sold, at aggregate carrying value     536    
Gain (loss) on sale of loans held for sale     50    
Subprime [Member] | Residential Mortgage [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total loans held for sale     2 3  
Other Income [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Lower of amortized cost or fair value adjustment attributed to non-credit factors     $ (5) 35 $ 16
Other Income [Member] | Residential Mortgage [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Additional lower of amortized cost or fair value adjustment   $ (5)   8  
Other Income [Member] | Residential Mortgage And Home Equity [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Additional lower of amortized cost or fair value adjustment       4  
Provision for Credit Losses [Member] | Residential Mortgage And Home Equity [Member] | Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Lower of cost or fair value adjustment attributed to credit factors       $ 11