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Loans and Allowance for Credit Losses, Loans Outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 887,637 $ 962,265 $ 953,110 $ 956,770 $ 967,604
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Deferred income as a percentage of total loans outstanding 1.00% 1.00%      
Total Commercial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 478,417 $ 515,719 513,405 503,388 506,536
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Financing receivable, accrued interest, writeoff 43        
Total Commercial [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 72,638 80,152 71,465 69,920 65,284
Commercial and industrial loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 318,805 354,125 350,199 333,125 330,840
Commercial and industrial loans [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 63,128 70,494 62,564 60,106 55,396
Commercial real estate construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 21,805 19,939 22,496 24,279 23,916
Commercial real estate construction [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 1,603 1,434 1,011 655 375
Commercial real estate mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 121,720 121,824 121,014 126,599 132,491
Commercial real estate mortgage [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 7,278 7,004 6,731 8,033 8,541
Lease financing [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 16,087 19,831 19,696 19,385 19,289
Lease financing [Member] | Non-U.S. [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 629 1,220 1,159 1,126 972
Total Consumer [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 409,220 446,546 439,705 453,382 461,068
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Financing receivable, accrued interest, writeoff 195        
Residential mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 299,960 $ 323,356      
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility amount outstanding 30,700        
Financing receivable line of credit facility conversion to term loan amount outstanding $ 7,300        
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 $ 4,800        
Financing receivable line of credit facility percentage revolving credit conversion to term loan in next two years 16.00%        
Financing receivable line of credit facility amount revolving credit conversion to term loan in two to four years $ 8,600        
Financing receivable line of credit facility percentage revolving credit conversion to term loan in two to four years 28.00%        
Financing receivable line of credit facility amount revolving credit conversion to term loan after four years $ 10,000        
Financing receivable line of credit facility percentage revolving credit conversion to term loan after four years 32.00%        
Financing receivable line of credit facility remaining borrowing capacity $ 53,600        
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 $ 381        
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 $ 378        
Financing receivable line of credit facility percentage thirty or more days past due 5.00%        
Residential mortgage [Member] | Minimum [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 10        
Residential mortgage [Member] | Median [Member] | Draw period [Member]          
Financing Receivable Line of Credit Facility [Abstract]          
Financing receivable line of credit facility expiration period 15        
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] | California [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 12.00% 13.00%      
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 4.00%        
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 three        
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 seven 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%        
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 five        
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        
Real estate 1-4 family first mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 276,674 $ 293,847 285,065 284,054 275,579
Real estate 1-4 family junior lien mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 23,286 29,509 34,398 39,713 46,237
Credit card [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 36,664 41,013 39,025 37,976 36,700
Auto [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 48,187 47,873 45,069 53,371 62,286
Other revolving credit and installment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 24,409 $ 34,304 $ 36,148 $ 38,268 $ 40,266
Commercial and industrial loans and leases [Member] | Product concentration risk [Member] | Loans [Member] | Financial institutions except banks [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 13.00% 12.00%      
Commercial real estate [Member] | Product concentration risk [Member] | Loans [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, financing receivable amount $ 0 $ 0      
Commercial real estate [Member] | Product concentration risk [Member] | Loans [Member] | Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Concentration risk, percentage 10.00% 10.00%