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Loans - Consumer Banking: Risk Profile by Geographic Region, Delinquency Status and Performing Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 254,473 $ 245,586 $ 229,851
Consumer Portfolio Segment [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 75,078 $ 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 $ 53,991 $ 47,916  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 53,991 $ 47,916  
Percentage of portfolio 71.90% 65.60%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,040 $ 6,304  
Percentage of portfolio 9.40% 8.60%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | California      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 6,099 $ 5,448  
Percentage of portfolio 8.10% 7.50%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Florida      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,486 $ 3,985  
Percentage of portfolio 6.00% 5.50%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Georgia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,726 $ 2,506  
Percentage of portfolio 3.60% 3.40%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Louisiana      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,236 $ 2,159  
Percentage of portfolio 3.00% 3.00%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Ohio      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,318 $ 2,017  
Percentage of portfolio 3.10% 2.80%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,181 $ 2,065  
Percentage of portfolio 2.90% 2.80%  
Consumer Portfolio Segment [Member] | Auto | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 26,905 $ 23,432  
Percentage of portfolio 35.80% 32.00%  
Consumer Portfolio Segment [Member] | Home loan      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 17,633 $ 21,584  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 17,633 $ 21,584  
Percentage of portfolio 23.50% 29.50%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Texas      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 882 $ 823  
Percentage of portfolio 1.20% 1.10%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | California      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,734 $ 4,993  
Percentage of portfolio 5.00% 6.80%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Illinois      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 976 $ 1,218  
Percentage of portfolio 1.30% 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 $ 6,909 $ 8,789  
Percentage of portfolio 9.20% 12.00%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,941 $ 2,036  
Percentage of portfolio 2.60% 2.80%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Maryland      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,226 $ 1,409  
Percentage of portfolio 1.60% 1.90%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | Virginia      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,034 $ 1,204  
Percentage of portfolio 1.40% 1.70%  
Consumer Portfolio Segment [Member] | Home loan | Loans Receivable | Geographic Concentration Risk | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 931 $ 1,112  
Percentage of portfolio 1.20% 1.50%  
Consumer Portfolio Segment [Member] | Retail banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,454 $ 3,554  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,454 $ 3,554  
Percentage of portfolio 4.60% 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 $ 717 $ 756  
Percentage of portfolio 0.90% 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 $ 953 $ 1,010  
Percentage of portfolio 1.30% 1.40%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 267 $ 263  
Percentage of portfolio 0.40% 0.40%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | New York      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 955 $ 941  
Percentage of portfolio 1.30% 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 $ 187 $ 190  
Percentage of portfolio 0.20% 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 $ 154 $ 156  
Percentage of portfolio 0.20% 0.20%  
Consumer Portfolio Segment [Member] | Retail banking | Loans Receivable | Geographic Concentration Risk | New Jersey      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 221 $ 238  
Percentage of portfolio 0.30% 0.30%