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Loans and Allowance for Credit Losses - Impaired Loans Average Recorded Investment and Interest Income Recognized (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment $ 5,710 $ 6,160 $ 7,341
Interest Income Recognized 237 274 340
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 799 383 414
Interest Income Recognized 9 13 9
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 324 433 592
Interest Income Recognized 15 16 26
Residential Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 2,422 2,666 2,742
Interest Income Recognized 124 131 140
Other Retail [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 293 336 377
Interest Income Recognized 13 14 17
Credit Card [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 214 221 273
Interest Income Recognized 4 4 9
Total Loans, Excluding GNMA and Covered Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 4,052 4,039 4,398
Interest Income Recognized 165 178 201
Covered Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 38 42 334
Interest Income Recognized 1 1 15
Government National Mortgage Association [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 1,620 2,079 2,609
Interest Income Recognized $ 71 $ 95 $ 124