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FAIR VALUE MEASUREMENT - Estimate Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Loans | $ 7,896 |  | $ 8,040 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 1,383,929 |  | 1,284,458 |  |  |
Investments | 450,732 |  | 476,657 |  |  |
Allowance for credit losses | 19,206 | $ 19,123 | 18,574 | $ 18,356 | $ 18,216 | $ 18,145
Loans, net of unearned income | 733,905 |  | 694,488 |  |  |
Corporate loans |  |  |  |  |  |
Assets |  |  |  |  |  |
Loans | 7,870 |  | 7,759 |  |  |
Liabilities |  |  |  |  |  |
Allowance for credit losses | 3,001 | $ 3,023 | 2,556 | $ 2,591 | $ 2,484 | $ 2,714
Loans, net of unearned income | 335,277 |  | 301,386 |  |  |
Lease financing |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Loans, net of unearned income | 200 |  | 300 |  |  |
Carrying value |  |  |  |  |  |
Assets |  |  |  |  |  |
HTM debt securities, net of allowance(1) | 202,300 |  | 247,600 |  |  |
Securities borrowed and purchased under agreements to resell | 156,600 |  | 133,200 |  |  |
Loans | 706,600 |  | 667,600 |  |  |
Other financial assets | 457,700 |  | 362,200 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 1,380,200 |  | 1,280,900 |  |  |
Securities loaned and sold under agreements to repurchase | 147,600 |  | 205,600 |  |  |
Long-term debt | 186,000 |  | 174,500 |  |  |
Other financial liabilities | 155,700 |  | 137,700 |  |  |
Allowance for credit losses | 19,200 |  | 18,600 |  |  |
Estimated fair value |  |  |  |  |  |
Assets |  |  |  |  |  |
HTM debt securities, net of allowance(1) | 190,600 |  | 229,800 |  |  |
Securities borrowed and purchased under agreements to resell | 156,600 |  | 133,200 |  |  |
Loans | 722,800 |  | 673,500 |  |  |
Other financial assets | 457,700 |  | 362,200 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 1,380,200 |  | 1,280,900 |  |  |
Securities loaned and sold under agreements to repurchase | 147,600 |  | 205,600 |  |  |
Long-term debt | 190,700 |  | 178,000 |  |  |
Other financial liabilities | 155,700 |  | 137,700 |  |  |
Estimated fair value | Corporate loans |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Loans, net of unearned income | 7,870 |  | 7,759 |  |  |
Estimated fair value | Level 1 |  |  |  |  |  |
Assets |  |  |  |  |  |
HTM debt securities, net of allowance(1) | 89,800 |  | 120,200 |  |  |
Securities borrowed and purchased under agreements to resell | 0 |  | 0 |  |  |
Loans | 0 |  | 0 |  |  |
Other financial assets | 348,100 |  | 260,600 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 0 |  | 0 |  |  |
Securities loaned and sold under agreements to repurchase | 0 |  | 0 |  |  |
Long-term debt | 0 |  | 0 |  |  |
Other financial liabilities | 0 |  | 0 |  |  |
Estimated fair value | Level 2 |  |  |  |  |  |
Assets |  |  |  |  |  |
HTM debt securities, net of allowance(1) | 98,600 |  | 107,400 |  |  |
Securities borrowed and purchased under agreements to resell | 156,600 |  | 133,200 |  |  |
Loans | 0 |  | 0 |  |  |
Other financial assets | 109,600 |  | 15,900 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 1,380,200 |  | 1,280,900 |  |  |
Securities loaned and sold under agreements to repurchase | 147,600 |  | 205,600 |  |  |
Long-term debt | 186,300 |  | 162,100 |  |  |
Other financial liabilities | 155,700 |  | 34,700 |  |  |
Estimated fair value | Level 3 |  |  |  |  |  |
Assets |  |  |  |  |  |
HTM debt securities, net of allowance(1) | 2,200 |  | 2,200 |  |  |
Securities borrowed and purchased under agreements to resell | 0 |  | 0 |  |  |
Loans | 722,800 |  | 673,500 |  |  |
Other financial assets | 0 |  | 85,700 |  |  |
Liabilities |  |  |  |  |  |
Deposits | 0 |  | 0 |  |  |
Securities loaned and sold under agreements to repurchase | 0 |  | 0 |  |  |
Long-term debt | 4,400 |  | 15,900 |  |  |
Other financial liabilities | 0 |  | 103,000 |  |  |
Estimated fair value | Level 3 | Corporate loans |  |  |  |  |  |
Fair value measurements additional disclosures |  |  |  |  |  |
Unfunded lending commitments | 10,700 |  | 13,500 |  |  |
Carried at cost | Non-marketable equity securities |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Investments | $ 5,200 |  | $ 5,200 |  |  |

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