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Loans and Allowance for Credit Losses, Loans by Credit Quality Indicator, Commercial (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]    
Loans [1] $ 949,878 $ 953,110
Total Commercial [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 512,245 513,405
Commercial and industrial loans [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 348,846 350,199
Commercial real estate mortgage [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 123,008 121,014
Commercial real estate construction [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 21,067 22,496
Commercial lease financing receivable [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 19,324 19,696
Non-PCI [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Nonaccrual loans 5,922 6,496
Non-PCI [Member] | Total Commercial [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 512,245 513,401
Nonaccrual loans 2,470 2,188
Non-PCI [Member] | Total Commercial [Member] | Pass [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 491,910 492,804
Non-PCI [Member] | Total Commercial [Member] | Criticized [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 20,335 20,597
Non-PCI [Member] | Commercial and industrial loans [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 348,846 350,195
Nonaccrual loans 1,634 1,486
Non-PCI [Member] | Commercial and industrial loans [Member] | Pass [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 334,034 335,412
Non-PCI [Member] | Commercial and industrial loans [Member] | Criticized [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 14,812 14,783
Non-PCI [Member] | Commercial real estate mortgage [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 123,008 121,014
Nonaccrual loans 737 580
Non-PCI [Member] | Commercial real estate mortgage [Member] | Pass [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 118,768 116,514
Non-PCI [Member] | Commercial real estate mortgage [Member] | Criticized [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 4,240 4,500
Non-PCI [Member] | Commercial real estate construction [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 21,067 22,496
Nonaccrual loans 36 32
Non-PCI [Member] | Commercial real estate construction [Member] | Pass [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 20,883 22,207
Non-PCI [Member] | Commercial real estate construction [Member] | Criticized [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 184 289
Non-PCI [Member] | Commercial lease financing receivable [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 19,324 19,696
Nonaccrual loans 63 90
Non-PCI [Member] | Commercial lease financing receivable [Member] | Pass [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 18,225 18,671
Non-PCI [Member] | Commercial lease financing receivable [Member] | Criticized [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 1,099 1,025
PCI [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 1,174 5,009
PCI loans 1,174 5,009
PCI [Member] | Total Commercial [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
Loans 0 4
PCI loans 0 4
PCI [Member] | Commercial and industrial loans [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
PCI loans 0 4
PCI [Member] | Commercial real estate mortgage [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
PCI loans 0 0
PCI [Member] | Commercial real estate construction [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
PCI loans 0 0
PCI [Member] | Commercial lease financing receivable [Member]    
Loans and Leases Receivable Disclosure [Abstract]    
PCI loans $ 0 $ 0
[1]
(1)
Parenthetical amounts represent assets and liabilities that we are required to carry at fair value or have elected the fair value option.