Outstanding Loans and Leases - Past Due (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 1,050,785 | $ 983,426 |
Percentage of outstandings, total outstanding | 100.00% | 100.00% |
Loans and leases, measured at fair value | $ 9,016 | $ 8,335 |
Loans and leases, pledged as collateral | 32,700 | 25,900 |
Loans pledged to secure borrowings | 217,600 | 168,200 |
Estimate of Fair Value Measurement | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 9,016 | $ 8,335 |
Percentage of outstandings, total outstanding | 0.86% | 0.85% |
Direct/indirect consumer | Nonperforming Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Nonperforming loans | $ 43 | $ 45 |
Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 465,954 | 465,769 |
Consumer Portfolio Segment | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 465,398 | 465,175 |
Consumer Portfolio Segment | Estimate of Fair Value Measurement | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 556 | 594 |
Consumer Portfolio Segment | Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Loans and leases, measured at fair value | 231 | 257 |
Consumer Portfolio Segment | Home equity lines of credit | | |
Financing Receivable, Past Due [Line Items] | | |
Loans and leases, measured at fair value | 325 | 337 |
Consumer real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 39,567 | |
Consumer real estate | Nonperforming Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Nonperforming loans | 878 | 856 |
Consumer real estate | Core Portfolio Residential Mortgage | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 233,635 | 225,770 |
Consumer real estate | Core Portfolio Home Equity | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 34,873 | 35,226 |
Consumer real estate | Non-core Residential Mortgage | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 9,910 | 10,399 |
Consumer real estate | Non-core Home Equity | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 4,694 | 4,982 |
Consumer real estate | Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 243,545 | |
Credit card and other consumer | Credit Card | Carrying Value | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 91,890 | 97,608 |
Credit card and other consumer | Direct/indirect consumer | Dealer Financial Services Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 50,000 | 50,400 |
Credit card and other consumer | Direct/indirect consumer | Securities Based Lending Loans | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 36,400 | 36,700 |
Credit card and other consumer | Direct/indirect consumer | Securities Based Lending Loans | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 3,000 | 2,800 |
Credit card and other consumer | Direct/indirect consumer | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 90,246 | 90,998 |
Credit card and other consumer | Other consumer | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 150 | 192 |
Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 584,831 | 517,657 |
Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 358,504 | |
Loans and leases, measured at fair value | 5,100 | 4,700 |
Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 116,612 | |
Loans and leases, measured at fair value | 3,400 | 3,100 |
Commercial portfolio | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 576,371 | 509,916 |
Commercial portfolio | Carrying Value | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 358,504 | 307,048 |
Commercial portfolio | Carrying Value | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 116,612 | 104,966 |
Commercial portfolio | Estimate of Fair Value Measurement | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 8,460 | 7,741 |
Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 66,654 | |
Commercial portfolio | Commercial real estate | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 62,900 | 59,000 |
Commercial portfolio | Commercial real estate | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 3,800 | 3,700 |
Commercial portfolio | Commercial real estate | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 66,654 | 62,689 |
Commercial portfolio | Commercial lease financing | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 19,180 | 19,880 |
Commercial portfolio | U.S. small business commercial | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 7,884 | |
Commercial portfolio | U.S. small business commercial | Carrying Value | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 15,421 | 15,333 |
30 to 59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 3,948 | $ 4,052 |
Percentage of outstandings | 0.38% | 0.41% |
30 to 59 Days Past Due | Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 2,774 | $ 2,866 |
30 to 59 Days Past Due | Consumer real estate | US Government Agency Insured Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Non-performing troubled debt with no change in repayment terms at time of discharge, past due | 474 | 517 |
30 to 59 Days Past Due | Consumer real estate | Nonperforming Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Non-performing troubled debt with no change in repayment terms at time of discharge, past due | 138 | 139 |
30 to 59 Days Past Due | Consumer real estate | Core Portfolio Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,348 | 1,378 |
30 to 59 Days Past Due | Consumer real estate | Core Portfolio Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 129 | 135 |
30 to 59 Days Past Due | Consumer real estate | Non-core Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 434 | 458 |
30 to 59 Days Past Due | Consumer real estate | Non-core Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 34 | 34 |
30 to 59 Days Past Due | Credit card and other consumer | Credit Card | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 541 | 564 |
30 to 59 Days Past Due | Credit card and other consumer | Direct/indirect consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 288 | 297 |
30 to 59 Days Past Due | Credit card and other consumer | Other consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 0 | 0 |
30 to 59 Days Past Due | Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,174 | 1,186 |
30 to 59 Days Past Due | Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 715 | 788 |
30 to 59 Days Past Due | Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 29 | 35 |
30 to 59 Days Past Due | Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 188 | 144 |
30 to 59 Days Past Due | Commercial portfolio | Commercial lease financing | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 119 | 100 |
30 to 59 Days Past Due | Commercial portfolio | U.S. small business commercial | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 123 | 119 |
60 to 89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 1,473 | $ 1,503 |
Percentage of outstandings | 0.14% | 0.15% |
60 to 89 Days Past Due | Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 953 | $ 1,070 |
60 to 89 Days Past Due | Consumer real estate | US Government Agency Insured Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Non-performing troubled debt with no change in repayment terms at time of discharge, past due | 174 | 206 |
60 to 89 Days Past Due | Consumer real estate | Nonperforming Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Non-performing troubled debt with no change in repayment terms at time of discharge, past due | 123 | 114 |
60 to 89 Days Past Due | Consumer real estate | Core Portfolio Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 262 | 261 |
60 to 89 Days Past Due | Consumer real estate | Core Portfolio Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 59 | 70 |
60 to 89 Days Past Due | Consumer real estate | Non-core Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 172 | 209 |
60 to 89 Days Past Due | Consumer real estate | Non-core Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 15 | 16 |
60 to 89 Days Past Due | Credit card and other consumer | Credit Card | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 368 | 429 |
60 to 89 Days Past Due | Credit card and other consumer | Direct/indirect consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 77 | 85 |
60 to 89 Days Past Due | Credit card and other consumer | Other consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 0 | 0 |
60 to 89 Days Past Due | Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 520 | 433 |
60 to 89 Days Past Due | Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 378 | 279 |
60 to 89 Days Past Due | Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 41 | 23 |
60 to 89 Days Past Due | Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 25 | 19 |
60 to 89 Days Past Due | Commercial portfolio | Commercial lease financing | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 25 | 56 |
60 to 89 Days Past Due | Commercial portfolio | U.S. small business commercial | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 51 | 56 |
90 Days or More Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 3,812 | $ 3,819 |
Percentage of outstandings | 0.36% | 0.39% |
90 Days or More Past Due | Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 2,994 | $ 3,175 |
90 Days or More Past Due | Consumer real estate | US Government Agency Insured Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Non-performing troubled debt with no change in repayment terms at time of discharge, past due | 1,000 | 1,100 |
90 Days or More Past Due | Consumer real estate | Core Portfolio Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 580 | 565 |
90 Days or More Past Due | Consumer real estate | Core Portfolio Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 215 | 198 |
90 Days or More Past Due | Consumer real estate | Non-core Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,109 | 1,263 |
90 Days or More Past Due | Consumer real estate | Non-core Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 67 | 72 |
90 Days or More Past Due | Credit card and other consumer | Credit Card | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 991 | 1,042 |
90 Days or More Past Due | Credit card and other consumer | Direct/indirect consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 32 | 35 |
90 Days or More Past Due | Credit card and other consumer | Other consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 0 | 0 |
90 Days or More Past Due | Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 818 | 644 |
90 Days or More Past Due | Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 504 | 371 |
90 Days or More Past Due | Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1 | 8 |
90 Days or More Past Due | Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 137 | 119 |
90 Days or More Past Due | Commercial portfolio | Commercial lease financing | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 68 | 39 |
90 Days or More Past Due | Commercial portfolio | U.S. small business commercial | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 108 | 107 |
Total Past Due 30 Days or More | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 9,233 | $ 9,374 |
Percentage of outstandings | 0.88% | 0.95% |
Total Past Due 30 Days or More | Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 6,721 | $ 7,111 |
Total Past Due 30 Days or More | Consumer real estate | Core Portfolio Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 2,190 | 2,204 |
Total Past Due 30 Days or More | Consumer real estate | Core Portfolio Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 403 | 403 |
Total Past Due 30 Days or More | Consumer real estate | Non-core Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,715 | 1,930 |
Total Past Due 30 Days or More | Consumer real estate | Non-core Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 116 | 122 |
Total Past Due 30 Days or More | Credit card and other consumer | Credit Card | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,900 | 2,035 |
Total Past Due 30 Days or More | Credit card and other consumer | Direct/indirect consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 397 | 417 |
Total Past Due 30 Days or More | Credit card and other consumer | Other consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 0 | 0 |
Total Past Due 30 Days or More | Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 2,512 | 2,263 |
Total Past Due 30 Days or More | Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 1,597 | 1,438 |
Total Past Due 30 Days or More | Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 71 | 66 |
Total Past Due 30 Days or More | Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 350 | 282 |
Total Past Due 30 Days or More | Commercial portfolio | Commercial lease financing | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 212 | 195 |
Total Past Due 30 Days or More | Commercial portfolio | U.S. small business commercial | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 282 | 282 |
Total Current or Less Than 30 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 1,032,536 | $ 965,717 |
Percentage of outstandings, total outstanding | 98.26% | 98.20% |
Total Current or Less Than 30 Days Past Due | Consumer Portfolio Segment | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 458,677 | $ 458,064 |
Total Current or Less Than 30 Days Past Due | Consumer real estate | Core Portfolio Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 231,445 | 223,566 |
Total Current or Less Than 30 Days Past Due | Consumer real estate | Core Portfolio Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 34,470 | 34,823 |
Total Current or Less Than 30 Days Past Due | Consumer real estate | Non-core Residential Mortgage | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 8,195 | 8,469 |
Total Current or Less Than 30 Days Past Due | Consumer real estate | Non-core Home Equity | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 4,578 | 4,860 |
Total Current or Less Than 30 Days Past Due | Credit card and other consumer | Credit Card | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 89,990 | 95,573 |
Total Current or Less Than 30 Days Past Due | Credit card and other consumer | Direct/indirect consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 89,849 | 90,581 |
Total Current or Less Than 30 Days Past Due | Credit card and other consumer | Other consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 150 | 192 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 573,859 | 507,653 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 356,907 | 305,610 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | Non United States | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 116,541 | 104,900 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 66,304 | 62,407 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | Commercial lease financing | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | 18,968 | 19,685 |
Total Current or Less Than 30 Days Past Due | Commercial portfolio | U.S. small business commercial | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, before credit loss allowance | $ 15,139 | $ 15,051 |