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Loans and Related Allowance for Credit Losses (Analysis of Loan Portfolio) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss $ 239,843 $ 241,928 $ 226,245
Percentage of total loans, past due 100.00% 100.00%  
Unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on purchased loans $ 1,100 $ 1,300  
Collateral Pledged      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due   1,500  
Other assets      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Accrued interest on loan portfolio   700  
Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due $ 234,819 $ 237,716  
Percentage of total loans, past due 97.90% 98.27%  
30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due $ 661 $ 620  
Percentage of total loans, past due 0.28% 0.26%  
60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due $ 258 $ 234  
Percentage of total loans, past due 0.11% 0.10%  
90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due $ 585 $ 509  
Percentage of total loans, past due 0.24% 0.21%  
Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due $ 1,504 $ 1,363  
Percentage of total loans, past due 0.63% 0.56%  
Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss $ 1,635 $ 2,286  
Percentage of total loans, past due 0.68% 0.94%  
Fair Value Option Nonaccrual Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Nonaccrual loans $ 166 $ 563  
Percentage of total loans, nonaccrual, past due 0.07% 0.23%  
Purchased Impaired Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Purchased impaired loans $ 1,719    
Percentage of total loans, past due 0.72%    
Commercial      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss $ 160,602 $ 167,203 152,282
Commercial | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 159,825 166,075  
Commercial | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 155 143  
Commercial | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 36 32  
Commercial | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 85 30  
Commercial | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 276 205  
Commercial | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 501 923  
Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 79,241 74,725 $ 73,963
Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 74,994 71,641  
Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 506 477  
Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 222 202  
Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 500 479  
Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 1,228 1,158  
Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 1,134 1,363  
Consumer | Fair Value Option Nonaccrual Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Nonaccrual loans 166 563  
Consumer | Purchased Impaired Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Purchased impaired loans 1,719    
Commercial and industrial | Commercial      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 125,337 132,073  
Commercial and industrial | Commercial | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 124,695 131,245  
Commercial and industrial | Commercial | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 102 106  
Commercial and industrial | Commercial | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 30 26  
Commercial and industrial | Commercial | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 85 30  
Commercial and industrial | Commercial | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 217 162  
Commercial and industrial | Commercial | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 425 666  
Commercial real estate | Commercial      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 28,110 28,716  
Commercial real estate | Commercial | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 28,061 28,485  
Commercial real estate | Commercial | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 4 6  
Commercial real estate | Commercial | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 1 1  
Commercial real estate | Commercial | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 5 7  
Commercial real estate | Commercial | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 44 224  
Equipment lease financing | Commercial      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 7,155 6,414  
Equipment lease financing | Commercial | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 7,069 6,345  
Equipment lease financing | Commercial | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 49 31  
Equipment lease financing | Commercial | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 5 5  
Equipment lease financing | Commercial | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 54 36  
Equipment lease financing | Commercial | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 32 33  
Home equity      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 25,085 24,088  
Home equity | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 25,085 24,088  
Home equity | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 23,791 23,318  
Home equity | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 58 50  
Home equity | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 24 21  
Home equity | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 82 71  
Home equity | Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 669 645  
Home equity | Consumer | Fair Value Option Nonaccrual Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Nonaccrual loans   54  
Home equity | Consumer | Purchased Impaired Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Purchased impaired loans 543    
Residential real estate      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 21,821 22,560  
Residential real estate | Government insured or guaranteed loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 584 922  
Residential real estate | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 21,821 22,560  
Residential real estate | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 19,640 20,945  
Residential real estate | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 140 181  
Residential real estate | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 69 78  
Residential real estate | Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 315 319  
Residential real estate | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 524 578  
Residential real estate | Consumer | Total Past Due | Government insured or guaranteed loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 400    
Total loans, before allowance for credit loss   400  
Residential real estate | Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 315 528  
Residential real estate | Consumer | Fair Value Option Nonaccrual Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Nonaccrual loans 166 509  
Residential real estate | Consumer | Purchased Impaired Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Purchased impaired loans 1,176    
Automobile | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 16,754 14,218  
Automobile | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 16,376 13,863  
Automobile | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 178 134  
Automobile | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 47 34  
Automobile | Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 18 12  
Automobile | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 243 180  
Automobile | Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 135 175  
Credit card      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 7,308    
Credit card | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 7,308 6,215  
Credit card | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 7,133 6,074  
Credit card | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 60 43  
Credit card | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 37 30  
Credit card | Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 67 60  
Credit card | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 164 133  
Credit card | Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 11 8  
Education      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 3,336 2,946  
Education | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 3,336 2,946  
Education | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 3,156 2,785  
Education | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 55 55  
Education | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 34 29  
Education | Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 91 77  
Education | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 180 161  
Education | Consumer | Total Past Due | Government insured or guaranteed loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 200    
Total loans, before allowance for credit loss   200  
Other consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 4,937 4,698  
Other consumer | Consumer      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss 4,937 4,698  
Other consumer | Consumer | Current or Less Than 30 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 4,898 4,656  
Other consumer | Consumer | 30-59 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 15 14  
Other consumer | Consumer | 60-89 Days Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 11 10  
Other consumer | Consumer | 90 Days Or More Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 9 11  
Other consumer | Consumer | Total Past Due      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, past due 35 35  
Other consumer | Consumer | Nonperforming Loans      
Financing Receivable. Recorded Investment, Past Due [Line Items]      
Total loans, before allowance for credit loss $ 4 $ 7