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LOANS - Types of Consumer Loan Modifications and Their Financial Effect (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 666,348 $ 666,348 $ 657,221
Consumer loans      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 377,714 $ 377,714 368,067
Consumer loans | In North America offices      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.13% 0.31%  
Total modifications balance $ 392 $ 931  
Loans, net of unearned income 302,453 302,453 289,014
Consumer loans | In North America offices | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 339 758  
Consumer loans | In North America offices | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 25 53  
Consumer loans | In North America offices | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 20 90  
Consumer loans | In North America offices | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 8 30  
Consumer loans | In North America offices | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance $ 0 $ 0  
Consumer loans | In offices outside North America      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.37% 0.47%  
Total modifications balance $ 280 $ 356  
Loans, net of unearned income 75,261 75,261 79,053
Consumer loans | In offices outside North America | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 14 35  
Consumer loans | In offices outside North America | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 2 6  
Consumer loans | In offices outside North America | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 7 25  
Consumer loans | In offices outside North America | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 4 13  
Consumer loans | In offices outside North America | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 253 277  
Consumer loans | Residential mortgages      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 106,369 $ 106,369 96,039
Consumer loans | Residential mortgages | In North America offices      
Financing Receivable, Impaired [Line Items]      
Trial modifications, period   3 months  
Trial modifications, amount 12 $ 22  
Loans that had gone through bankruptcy $ 4 $ 6  
Modifications as % of loans 0.05% 0.14%  
Total modifications balance $ 48 $ 145  
Weighted average interest rate reduction % 1.00% 1.00%  
Weighted average term extension 220 months 202 months  
Weighted average delay in payments 6 months 8 months  
Loans, net of unearned income $ 106,369 $ 106,369 96,039
Consumer loans | Residential mortgages | In North America offices | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 1  
Consumer loans | Residential mortgages | In North America offices | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 25 53  
Consumer loans | Residential mortgages | In North America offices | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 19 82  
Consumer loans | Residential mortgages | In North America offices | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 4 9  
Consumer loans | Residential mortgages | In North America offices | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance $ 0 $ 0  
Consumer loans | Residential mortgages | In offices outside North America      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.99% 1.15%  
Total modifications balance $ 260 $ 303  
Weighted average interest rate reduction % 0.00% 2.00%  
Weighted average term extension 1 month 3 months  
Weighted average delay in payments 1 month 4 months  
Payment deferral period   4 months  
Loans, net of unearned income $ 26,389 $ 26,389 28,114
Consumer loans | Residential mortgages | In offices outside North America | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Residential mortgages | In offices outside North America | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Residential mortgages | In offices outside North America | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 7 25  
Consumer loans | Residential mortgages | In offices outside North America | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 1  
Consumer loans | Residential mortgages | In offices outside North America | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 253 277  
Consumer loans | Home equity loans      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 3,796 $ 3,796 4,580
Consumer loans | Home equity loans | In North America offices      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.03% 0.55%  
Total modifications balance $ 1 $ 21  
Weighted average interest rate reduction % 2.00% 2.00%  
Weighted average term extension 146 months 122 months  
Weighted average delay in payments 6 months 8 months  
Loans, net of unearned income $ 3,796 $ 3,796 4,580
Consumer loans | Home equity loans | In North America offices | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Home equity loans | In North America offices | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Home equity loans | In North America offices | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 1 8  
Consumer loans | Home equity loans | In North America offices | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 13  
Consumer loans | Home equity loans | In North America offices | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards      
Financing Receivable, Impaired [Line Items]      
Loans forgiven 17 38  
Loans, net of unearned income $ 155,092 $ 155,092 150,098
Consumer loans | Credit cards | In North America offices      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.22% 0.49%  
Total modifications balance $ 339 $ 756  
Weighted average interest rate reduction % 22.00% 22.00%  
Loans, net of unearned income $ 155,698 $ 155,698 150,643
Consumer loans | Credit cards | In North America offices | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 339 756  
Consumer loans | Credit cards | In North America offices | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards | In North America offices | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards | In North America offices | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards | In North America offices | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance $ 0 $ 0  
Consumer loans | Credit cards | In offices outside North America      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.10% 0.24%  
Total modifications balance $ 13 $ 33  
Weighted average interest rate reduction % 18.00% 18.00%  
Weighted average term extension   28 months  
Loans, net of unearned income $ 13,573 $ 13,573 12,955
Consumer loans | Credit cards | In offices outside North America | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 13 32  
Consumer loans | Credit cards | In offices outside North America | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards | In offices outside North America | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Credit cards | In offices outside North America | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 1  
Consumer loans | Credit cards | In offices outside North America | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Personal, small business and other      
Financing Receivable, Impaired [Line Items]      
Loans forgiven 1 2  
Loans, net of unearned income $ 35,691 $ 35,691 36,812
Consumer loans | Personal, small business and other | In North America offices      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.01% 0.02%  
Total modifications balance $ 4 $ 9  
Weighted average interest rate reduction % 6.00% 6.00%  
Weighted average term extension 15 months 15 months  
Loans, net of unearned income $ 36,590 $ 36,590 37,752
Consumer loans | Personal, small business and other | In North America offices | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 1  
Consumer loans | Personal, small business and other | In North America offices | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Personal, small business and other | In North America offices | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Personal, small business and other | In North America offices | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 4 8  
Consumer loans | Personal, small business and other | In North America offices | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance $ 0 $ 0  
Consumer loans | Personal, small business and other | In offices outside North America      
Financing Receivable, Impaired [Line Items]      
Modifications as % of loans 0.02% 0.06%  
Total modifications balance $ 7 $ 20  
Weighted average interest rate reduction % 8.00% 8.00%  
Weighted average term extension 21 months 19 months  
Loans, net of unearned income $ 35,299 $ 35,299 $ 37,984
Consumer loans | Personal, small business and other | In offices outside North America | Interest rate reduction      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 1 3  
Consumer loans | Personal, small business and other | In offices outside North America | Term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 2 6  
Consumer loans | Personal, small business and other | In offices outside North America | Payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 0 0  
Consumer loans | Personal, small business and other | In offices outside North America | Combination: interest rate reduction and term extension      
Financing Receivable, Impaired [Line Items]      
Total modifications balance 4 11  
Consumer loans | Personal, small business and other | In offices outside North America | Combination: term extension and payment delay      
Financing Receivable, Impaired [Line Items]      
Total modifications balance $ 0 $ 0