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LOANS - Consumer Loans Credit Scores (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | $ 733,905 | $ 694,488
Unallocated portfolio layer cumulative basis adjustments |  | (72)
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 398,628 | 393,102
Unallocated portfolio layer cumulative basis adjustments | 592 | (224)
Consumer loans | In North America offices |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 320,595 | 321,948
Consumer loans | In North America offices | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 2,996 | 3,162
Consumer loans | In North America offices | 90+ days past due | Banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 25,200 | 25,900
Consumer loans | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 77,441 | 71,378
Consumer loans | In offices outside North America | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 399 | 310
Consumer loans | In offices outside North America | 90+ days past due | Banking |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 21,600 | 17,600
Consumer loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 319,191 | 320,631
Consumer loans | Residential mortgages | In North America offices |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 117,799 | 114,593
Consumer loans | Residential mortgages | In North America offices | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 548 | 349
Consumer loans | Residential mortgages | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 24,078 | 24,456
Consumer loans | Residential mortgages | In offices outside North America | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 73 | 60
Consumer loans | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 117,799 | 114,593
Consumer loans | Home equity loans | In North America offices |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 2,916 | 3,141
Consumer loans | Home equity loans | In North America offices | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 40 | 58
Consumer loans | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 2,916 | 3,141
Consumer loans | Credit cards | In North America offices |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 167,446 | 171,059
Consumer loans | Credit cards | In North America offices | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 2,377 | 2,705
Consumer loans | Credit cards | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving loans converted to term loans | 50 | 33
Total loans, net of unearned income | 13,754 | 12,927
Consumer loans | Credit cards | In offices outside North America | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 286 | 214
Consumer loans | Credit cards | Canada |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 572 | 562
Consumer loans | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 166,874 | 170,497
Consumer loans | Personal, small business and other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving loans converted to term loans | 16 | 22
Consumer loans | Personal, small business and other | In North America offices |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 32,434 | 33,155
Consumer loans | Personal, small business and other | In North America offices | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 31 | 50
Consumer loans | Personal, small business and other | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 39,609 | $ 33,995
Consumer loans | Personal, small business and other | In offices outside North America | Internal Investment Grade |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage of loans rated investment grade |  | 83.00%
Consumer loans | Personal, small business and other | In offices outside North America | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 40 | $ 36
Consumer loans | Personal, small business and other | Canada |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 833 | 755
Consumer loans | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 31,602 | 32,400
Consumer loans | Classifiably Managed and Delinquency Managed | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 79,400 | 72,500
Consumer loans | Less than 660 | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 28,159 | 27,952
Consumer loans | Less than 660 | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 91 | 123
One year prior to current fiscal year | 151 | 223
Two years prior to current fiscal year | 210 | 354
Three years prior to current fiscal year | 344 | 312
Four years prior to current fiscal year | 346 | 298
Prior | 1,715 | 1,473
Total loans, net of unearned income | 2,857 | 2,783
Consumer loans | Less than 660 | Home equity line of credit (pre-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 240 | 266
Consumer loans | Less than 660 | Home equity line of credit (post-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 60 | 58
Consumer loans | Less than 660 | Home equity term loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
One year prior to current fiscal year | 0 | 0
Two years prior to current fiscal year | 0 | 0
Three years prior to current fiscal year | 0 | 0
Four years prior to current fiscal year | 0 | 0
Prior | 40 | 45
Total loans, net of unearned income | 40 | 45
Consumer loans | Less than 660 | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 340 | 369
Consumer loans | Less than 660 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 22,826 | 22,855
Consumer loans | Less than 660 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving loans converted to term loans | 1,660 | 1,462
Total loans, net of unearned income | 24,486 | 24,317
Consumer loans | Less than 660 | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 47 | 96
One year prior to current fiscal year | 146 | 132
Two years prior to current fiscal year | 101 | 131
Three years prior to current fiscal year | 79 | 28
Four years prior to current fiscal year | 13 | 2
Prior | 90 | 94
Total loans, net of unearned income | 476 | 483
Consumer loans | 660 to 739 | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 78,270 | 79,930
Consumer loans | 660 to 739 | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 1,603 | 2,213
One year prior to current fiscal year | 1,770 | 2,451
Two years prior to current fiscal year | 2,111 | 3,272
Three years prior to current fiscal year | 3,022 | 2,745
Four years prior to current fiscal year | 2,488 | 1,990
Prior | 6,264 | 5,034
Total loans, net of unearned income | 17,258 | 17,705
Consumer loans | 660 to 739 | Home equity line of credit (pre-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 702 | 764
Consumer loans | 660 to 739 | Home equity line of credit (post-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 76 | 80
Consumer loans | 660 to 739 | Home equity term loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
One year prior to current fiscal year | 0 | 0
Two years prior to current fiscal year | 0 | 0
Three years prior to current fiscal year | 0 | 0
Four years prior to current fiscal year | 0 | 1
Prior | 75 | 86
Total loans, net of unearned income | 75 | 87
Consumer loans | 660 to 739 | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 853 | 931
Consumer loans | 660 to 739 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 58,363 | 59,574
Consumer loans | 660 to 739 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving loans converted to term loans | 805 | 668
Total loans, net of unearned income | 59,168 | 60,242
Consumer loans | 660 to 739 | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 219 | 398
One year prior to current fiscal year | 349 | 282
Two years prior to current fiscal year | 173 | 180
Three years prior to current fiscal year | 95 | 38
Four years prior to current fiscal year | 17 | 2
Prior | 138 | 152
Total loans, net of unearned income | 991 | 1,052
Consumer loans | Greater than or equal to 740 | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 175,576 | 174,872
Consumer loans | Greater than or equal to 740 | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 9,348 | 10,308
One year prior to current fiscal year | 8,988 | 12,936
Two years prior to current fiscal year | 11,884 | 16,034
Three years prior to current fiscal year | 15,372 | 14,651
Four years prior to current fiscal year | 14,117 | 12,245
Prior | 30,830 | 20,573
Total loans, net of unearned income | 90,539 | 86,747
Consumer loans | Greater than or equal to 740 | Home equity line of credit (pre-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 1,512 | 1,597
Consumer loans | Greater than or equal to 740 | Home equity line of credit (post-reset) | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 70 | 75
Consumer loans | Greater than or equal to 740 | Home equity term loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 0 | 0
One year prior to current fiscal year | 0 | 0
Two years prior to current fiscal year | 0 | 0
Three years prior to current fiscal year | 0 | 1
Four years prior to current fiscal year | 1 | 2
Prior | 96 | 111
Total loans, net of unearned income | 97 | 114
Consumer loans | Greater than or equal to 740 | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 1,679 | 1,786
Consumer loans | Greater than or equal to 740 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 81,063 | 83,935
Consumer loans | Greater than or equal to 740 | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Revolving loans converted to term loans | 155 | 129
Total loans, net of unearned income | 81,218 | 84,064
Consumer loans | Greater than or equal to 740 | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Current fiscal year | 754 | 1,219
One year prior to current fiscal year | 789 | 577
Two years prior to current fiscal year | 307 | 271
Three years prior to current fiscal year | 133 | 54
Four years prior to current fiscal year | 21 | 4
Prior | 136 | 150
Total loans, net of unearned income | 2,140 | 2,275
Consumer loans | Classifiably managed | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 21,562 | 17,553
Consumer loans | Classifiably managed | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 25,223 | 25,860
Consumer loans | Classifiably managed | Residential mortgages | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 0 | 0
Consumer loans | Classifiably managed | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 0 | 0
Consumer loans | Classifiably managed | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 0 | 0
Consumer loans | Classifiably managed | Credit cards | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 0 | 0
Consumer loans | Classifiably managed | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 0 | 0
Consumer loans | Classifiably managed | Personal, small business and other | In offices outside North America |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 21,562 | 17,553
Consumer loans | Classifiably managed | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 25,223 | 25,860
Consumer loans | FICO not available | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 11,963 | 12,017
Consumer loans | FICO not available | Residential mortgages | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 7,145 | 7,358
Consumer loans | FICO not available | Home equity loans | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 44 | 55
Consumer loans | FICO not available | Credit cards | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | 2,002 | 1,874
Consumer loans | FICO not available | Personal, small business and other | U.S. plans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans, net of unearned income | $ 2,772 | $ 2,730

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