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Loans and Allowance for Loan Losses (Details 6) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Aging of loans      
Transfer of Portfolio Loans and Leases to Held-for-sale $ 179 $ 202  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 2    
Loans covered under a loss share agreement with FDIC 14   $ 19
Commercial Loan      
Aging of loans      
Total loans 47,247   46,505
Commercial portfolio      
Aging of loans      
Total loans 47,160   46,392
Commercial portfolio | Commercial and industrial      
Aging of loans      
Total loans 29,886   30,337
Commercial portfolio | Construction      
Aging of loans      
Total loans 15,019   2,297
Commercial portfolio | Commercial mortgage      
Aging of loans      
Total loans 2,255   13,758
Commercial portfolio | Commercial Loan      
Aging of loans      
Financing Receivable, Significant Sales 112    
Financing Receivable, Reclassification to Held-for-sale 179 $ 207  
Purchased credit-impaired loans      
Aging of loans      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 16    
Purchased credit-impaired loans | Commercial Loan      
Aging of loans      
Total loans 87   113
Pass | Commercial Loan      
Aging of loans      
Total loans 44,332   43,978
Pass | Commercial portfolio      
Aging of loans      
Total loans 44,301   43,938
Pass | Commercial portfolio | Commercial and industrial      
Aging of loans      
Total loans 27,378   28,228
Pass | Commercial portfolio | Construction      
Aging of loans      
Total loans 14,723   2,240
Pass | Commercial portfolio | Commercial mortgage      
Aging of loans      
Total loans 2,200   13,470
Pass | Purchased credit-impaired loans | Commercial Loan      
Aging of loans      
Total loans 31   40
Special Mention | Commercial Loan      
Aging of loans      
Total loans 979   1,052
Special Mention | Commercial portfolio      
Aging of loans      
Total loans 973   1,040
Special Mention | Commercial portfolio | Commercial and industrial      
Aging of loans      
Total loans 783   844
Special Mention | Commercial portfolio | Construction      
Aging of loans      
Total loans 135   57
Special Mention | Commercial portfolio | Commercial mortgage      
Aging of loans      
Total loans 55   139
Special Mention | Purchased credit-impaired loans | Commercial Loan      
Aging of loans      
Total loans 6   12
Classified | Commercial Loan      
Aging of loans      
Total loans 1,936   1,475
Classified | Commercial portfolio      
Aging of loans      
Total loans 1,886   1,414
Classified | Commercial portfolio | Commercial and industrial      
Aging of loans      
Total loans 1,725   1,265
Classified | Commercial portfolio | Construction      
Aging of loans      
Total loans 161   0
Classified | Commercial portfolio | Commercial mortgage      
Aging of loans      
Total loans 0   149
Classified | Purchased credit-impaired loans | Commercial Loan      
Aging of loans      
Total loans 50   61
Oil and Gas [Member] | Criticized [Member] | Commercial portfolio      
Aging of loans      
Total loans $ 1,577   $ 1,226