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Asset Quality - Past Due Loans Including Current Loans (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 84,057 $ 59,198  
Non-performing Loans 625 387  
Total Past Due and Non-performing Loans 1,116 667  
Purchased Credit Impaired 865 11  
Total Loans 86,038 59,876 $ 57,381
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 305 142  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 99 66  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 87 72  
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 39,242 31,116  
Non-performing Loans 297 82  
Total Past Due and Non-performing Loans 414 124  
Purchased Credit Impaired 112 0  
Total Loans 39,768 31,240  
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 14,655 7,917  
Non-performing Loans 26 19  
Total Past Due and Non-performing Loans 134 42  
Purchased Credit Impaired 322 0  
Total Loans 15,111 7,959  
Commercial Loans [Member] | Commercial Real Estate Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,314 1,042  
Non-performing Loans 3 9  
Total Past Due and Non-performing Loans 5 11  
Purchased Credit Impaired 26 0  
Total Loans 2,345 1,053  
Commercial Loans [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 16,969 8,959  
Non-performing Loans 29 28  
Total Past Due and Non-performing Loans 139 53  
Purchased Credit Impaired 348 0  
Total Loans 17,456 9,012  
Commercial Loans [Member] | Commercial Lease Financing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 4,641 3,952  
Non-performing Loans 8 13  
Total Past Due and Non-performing Loans 44 68  
Purchased Credit Impaired 0 0  
Total Loans 4,685 4,020  
Commercial Loans [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 60,852 44,027  
Non-performing Loans 334 123  
Total Past Due and Non-performing Loans 597 245  
Purchased Credit Impaired 460 0  
Total Loans 61,909 44,272  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 58 11  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 93 8  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 0 1  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 93 9  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Lease Financing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 28 33  
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 179 53  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 28 11  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 9 5  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 0 1  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 9 6  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Lease Financing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 3 11  
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 40 28  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 31 20  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 6 10  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 2 0  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 8 10  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Lease Financing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 5 11  
Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 44 41  
Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans   15,604  
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 5,098 2,149  
Non-performing Loans 56 64  
Total Past Due and Non-performing Loans 81 83  
Purchased Credit Impaired 368 10  
Total Loans 5,547 2,242  
Consumer Loans [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 12,327 10,056  
Non-performing Loans 223 190  
Total Past Due and Non-performing Loans 317 278  
Purchased Credit Impaired 30 1  
Total Loans 12,674 10,335  
Consumer Loans [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,705 1,580  
Non-performing Loans 6 2  
Total Past Due and Non-performing Loans 76 20  
Purchased Credit Impaired 7 0  
Total Loans 1,788 1,600  
Consumer Loans [Member] | Consumer Credit Card [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,082 785  
Non-performing Loans 2 2  
Total Past Due and Non-performing Loans 29 21  
Purchased Credit Impaired 0 0  
Total Loans 1,111 806  
Consumer Loans [Member] | Consumer Indirect Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,993 601  
Non-performing Loans 4 6  
Total Past Due and Non-performing Loans 16 20  
Purchased Credit Impaired 0 0  
Total Loans 3,009 621  
Consumer Loans [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 23,205 15,171  
Non-performing Loans 291 264  
Total Past Due and Non-performing Loans 519 422  
Purchased Credit Impaired 405 11  
Total Loans 24,129    
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 17 14  
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 49 50  
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 44 10  
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Credit Card [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 9 6  
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Indirect Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 7 9  
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 126 89  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 5 3  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 29 24  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 15 3  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Credit Card [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 6 4  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Indirect Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 4 4  
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 59 38  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 3 2  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 16 14  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 11 5  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Credit Card [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 12 9  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Indirect Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans 1 1  
Consumer Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due and Non-performing Loans $ 43 $ 31