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Loans - Consumer Banking: Risk Profile by Geographic Region, Delinquency Status and Performing Status (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 240,588 $ 245,586 $ 227,613
Consumer Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 73,982 $ 73,054  
Percentage of portfolio 100.00% 100.00%  
Consumer Portfolio Segment [Member] | Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 49,771 $ 47,916  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 49,771 $ 47,916  
Percentage of portfolio 67.30% 65.60%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 6,549 $ 6,304  
Percentage of portfolio 8.90% 8.60%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | California      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 5,659 $ 5,448  
Percentage of portfolio 7.60% 7.50%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,219 $ 2,159  
Percentage of portfolio 3.00% 3.00%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,116 $ 2,065  
Percentage of portfolio 2.90% 2.80%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,175 $ 3,985  
Percentage of portfolio 5.60% 5.50%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Georgia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,581 $ 2,506  
Percentage of portfolio 3.50% 3.40%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,097 $ 2,017  
Percentage of portfolio 2.80% 2.80%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 24,375 $ 23,432  
Percentage of portfolio 33.00% 32.00%  
Consumer Portfolio Segment [Member] | Home loan      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20,738 $ 21,584  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20,738 $ 21,584  
Percentage of portfolio 28.00% 29.50%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | California      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,622 $ 4,993  
Percentage of portfolio 6.20% 6.80%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 942 $ 985  
Percentage of portfolio 1.30% 1.30%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,075 $ 2,036  
Percentage of portfolio 2.80% 2.80%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,199 $ 1,218  
Percentage of portfolio 1.60% 1.70%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,363 $ 1,409  
Percentage of portfolio 1.80% 1.90%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,114 $ 1,112  
Percentage of portfolio 1.50% 1.50%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,191 $ 1,204  
Percentage of portfolio 1.60% 1.70%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8,232 $ 8,627  
Percentage of portfolio 11.20% 11.80%  
Consumer Portfolio Segment [Member] | Retail banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,473 $ 3,554  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,473 $ 3,554  
Percentage of portfolio 4.70% 4.90%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 741 $ 756  
Percentage of portfolio 1.00% 1.00%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 979 $ 1,010  
Percentage of portfolio 1.30% 1.40%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 928 $ 941  
Percentage of portfolio 1.20% 1.30%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 186 $ 190  
Percentage of portfolio 0.30% 0.30%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 226 $ 238  
Percentage of portfolio 0.30% 0.30%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 152 $ 156  
Percentage of portfolio 0.20% 0.20%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 261 $ 263  
Percentage of portfolio 0.40% 0.40%