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Loans and Allowance for Credit Losses, Loans Outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 962,265 $ 953,110 $ 956,770 $ 967,604 $ 916,559
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Deferred income as a percentage of total loans outstanding 1.00% 1.00%      
PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 568 $ 5,009      
Total Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 515,719 513,405 503,388 506,536 456,583
Total Commercial [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 80,152 71,465 69,920 65,284 58,117
Total Commercial [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 0 4      
Total Commercial [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 515,719 513,401      
Commercial and industrial loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 354,125 350,199 333,125 330,840 299,892
Commercial and industrial loans [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 70,494 62,564 60,106 55,396 49,049
Commercial and industrial loans [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 0 4      
Commercial and industrial loans [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 354,125 350,195      
Commercial real estate mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 121,824 121,014 126,599 132,491 122,160
Commercial real estate mortgage [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 7,004 6,731 8,033 8,541 8,350
Commercial real estate mortgage [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 0 0      
Commercial real estate mortgage [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 121,824 121,014      
Commercial real estate construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 19,939 22,496 24,279 23,916 22,164
Commercial real estate construction [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 1,434 1,011 655 375 444
Commercial real estate construction [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 0 0      
Commercial real estate construction [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 19,939 22,496      
Lease financing [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 19,831 19,696 19,385 19,289 12,367
Lease financing [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 1,220 1,159 1,126 972 274
Lease financing [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 0 0      
Lease financing [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 19,831 19,696      
Total Consumer [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 446,546 439,705 453,382 461,068 459,976
Total Consumer [Member] | PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 568 5,005      
Total Consumer [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 445,978 434,700      
Residential mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 323,356 $ 319,463      
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility amount outstanding 37,900        
Financing receivable line of credit facility conversion to term loan amount outstanding $ 9,100        
Financing receivable line of credit facility conversion to term loan percentage 24.00%        
Financing receivable line of credit facility amount revolving credit conversion to term loan in next two years $ 1,600        
Financing receivable line of credit facility percentage revolving credit conversion to term loan in next two years 4.00%        
Financing receivable line of credit facility amount revolving credit conversion to term loan in two to four years $ 11,100        
Financing receivable line of credit facility percentage revolving credit conversion to term loan in two to four years 29.00%        
Financing receivable line of credit facility amount revolving credit conversion to term loan after four years $ 16,100        
Financing receivable line of credit facility percentage revolving credit conversion to term loan after four years 43.00%        
Financing receivable line of credit facility remaining borrowing capacity $ 58,900        
Residential mortgage [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility periodic payment 1.50%        
Financing receivable line of credit facility amount outstanding thirty or more days past due $ 488        
Financing receivable line of credit facility percentage thirty or more days past due 2.00%        
Residential mortgage [Member] | Amortizing payment period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility amount outstanding thirty or more days past due $ 399        
Financing receivable line of credit facility percentage thirty or more days past due 4.00%        
Residential mortgage [Member] | Minimum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 10 years        
Residential mortgage [Member] | Median [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 15 years        
Residential mortgage [Member] | Maximum [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility revolving credit conversion to term loan period 30 years        
Residential mortgage [Member] | Maximum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 20 years        
Residential mortgage [Member] | Geographic concentration risk [Member] | Loans [Member] | Maximum [Member] | California, larger metropolitan areas [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 5.00%        
Residential mortgage [Member] | Interest-only loans [Member] | Minimum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 3 years        
Residential mortgage [Member] | Interest-only loans [Member] | Maximum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 7 years        
Residential mortgage [Member] | Interest-only loans [Member] | Product concentration risk [Member] | Loans [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 3.00% 4.00%      
Residential mortgage [Member] | Option payment loans [Member] | Product concentration risk [Member] | Loans [Member] | Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 1.00%        
Residential mortgage [Member] | Fully amortizing payment loans [Member] | Minimum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 5 years        
Residential mortgage [Member] | Fully amortizing payment loans [Member] | Maximum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 30 years        
Residential mortgage [Member] | PCI [Member] | Geographic concentration risk [Member] | Loans [Member] | California [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 1.00% 1.00%      
Residential mortgage [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 322,788 $ 314,458      
Residential mortgage [Member] | Non-PCI [Member] | Geographic concentration risk [Member] | Loans [Member] | California [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 13.00% 12.00%      
Real estate 1-4 family first mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 293,847 $ 285,065 284,054 275,579 273,869
Real estate 1-4 family first mortgage [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 293,292 280,077      
Real estate 1-4 family junior lien mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 29,509 34,398 39,713 46,237 53,004
Real estate 1-4 family junior lien mortgage [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 29,496 34,381      
Credit card [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 41,013 39,025 37,976 36,700 34,039
Credit card [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 41,013 39,025      
Automobile [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 47,873 45,069 53,371 62,286 59,966
Automobile [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 47,873 45,069      
Other revolving credit and installment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 34,304 36,148 $ 38,268 $ 40,266 $ 39,098
Other revolving credit and installment [Member] | Non-PCI [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 34,304 $ 36,148      
Commercial and industrial loans and leases [Member] | Product concentration risk [Member] | Loans [Member] | Financial institutions except banks industry [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 12.00% 11.00%      
Commercial and industrial loans and leases [Member] | Product concentration risk [Member] | Loans [Member] | Domestic [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, financing receivable amount $ 0 $ 0      
Commercial and industrial loans and leases [Member] | Product concentration risk [Member] | Loans [Member] | Minimum [Member] | Domestic [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 10.00% 10.00%