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Loans and Allowance for Credit Losses - Summary of Impaired Loans, which Include Nonaccrual and TDR Loans, by Portfolio Class (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 6,011 $ 5,902
Unpaid Principal Balance 7,860 7,879
Valuation Allowance 368 369
Commitments to Lend Additional Funds 385 160
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 820 520
Unpaid Principal Balance 1,365 1,110
Valuation Allowance 51 25
Commitments to Lend Additional Funds 376 154
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 316 336
Unpaid Principal Balance 784 847
Valuation Allowance 3 11
Commitments to Lend Additional Funds 5 1
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,504 2,575
Unpaid Principal Balance 3,141 3,248
Valuation Allowance 188 199
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 301 309
Unpaid Principal Balance 493 503
Valuation Allowance 34 35
Commitments to Lend Additional Funds 3 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 212 210
Unpaid Principal Balance 212 210
Valuation Allowance 57 57
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 4,153 3,950
Unpaid Principal Balance 5,995 5,918
Valuation Allowance 333 327
Commitments to Lend Additional Funds 384 159
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 38 39
Unpaid Principal Balance 45 48
Valuation Allowance 1 2
Commitments to Lend Additional Funds 1 1
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,820 1,913
Unpaid Principal Balance 1,820 1,913
Valuation Allowance $ 34 $ 40