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Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Individually evaluated $ 2,812 $ 2,821    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 196 204    
Collectively evaluated 139,618 140,164    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,498 1,531    
Total evaluated 142,430 142,985    
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans 1,694 1,735    
Loans Receivable, Fair Value Disclosure 188 196    
Total [1] 142,618 143,181    
Loans and Leases Receivable, Allowance 1,694 1,735 $ 1,714 $ 1,709
Commercial Portfolio Segment [Member]        
Individually evaluated 211 173    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 22 21    
Collectively evaluated 75,113 75,304    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,046 1,080    
Total evaluated 75,324 75,477    
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans 1,068 1,101    
Loans Receivable, Fair Value Disclosure 0 0    
Total 75,324 75,477    
Loans and Leases Receivable, Allowance 1,068 1,101 1,120 1,124
Residential Portfolio Segment [Member]        
Total 38,273 38,620    
Consumer Portfolio Segment [Member]        
Individually evaluated 2,601 2,648    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 174 183    
Collectively evaluated 64,505 64,860    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 452 451    
Total evaluated 67,106 67,508    
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans 626 634    
Loans Receivable, Fair Value Disclosure 188 196    
Total 67,294 67,704    
Loans and Leases Receivable, Allowance $ 626 $ 634 $ 594 $ 585
[1] Includes loans of consolidated VIEs of $171 million and $179 million at March 31, 2018 and December 31, 2017, respectively.