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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 04, 2023 | Mar. 27, 2023 | Dec. 31, 2023
FDIC Credit Facility |  |  |
Business Acquisition [Line Items] |  |  |
FDIC advances, maximum amount available |  | $ 70,000 |
Purchase Money Note |  |  |
Business Acquisition [Line Items] |  |  |
Debt instrument, term |  | 5 years |
Principal amount |  | $ 36,070 |
Notes payable, fair value disclosure |  | 35,810 |
SVBB |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired |  | 107,539 |
Loans and leases, net of the initial PCD ALLL |  | 68,468 |
Cash and interest-earning deposits at banks |  | 35,310 |
Total liabilities assumed |  | 61,423 |
Deposits |  | 56,014 |
Assets acquired, discount |  | 16,450 |
Business combination, financing receivable acquired, amount covered by share-loss agreement |  | $ 60,000 |
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss up to $5 billion |  | 0.00% |
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss in excess of $5 billion |  | $ 5,000 |
Business combination, financing receivable acquired, above threshold amount covered by share-loss agreement, percentage |  | 50.00% |
Share-Loss Agreement, reimbursement percentage |  | 50.00% |
Share-Loss Agreement, term |  | 5 years |
Share-Loss Agreement, reimbursement term |  | 8 years |
Loans funded after acquisition date, loss share term |  | 1 year |
Cash settled value appreciation instrument issued and issuable (in shares) |  | 5,000,000 |
Cash settled value appreciation instrument issued and issuable, number of shares benchmark (in shares) |  | 1 |
Number of trading days |  | 2 days |
Cash settled value appreciation instrument, threshold amount (in dollars per share) |  | $ 582.55 |
Cash settled value appreciation instrument, maximum amount |  | $ 500 |
Payment to acquire business, value appreciation instrument exercised | $ 500 |  |
Gain on acquisition, after income taxes |  | 9,808 | $ 9,810
Deferred tax liabilities |  | $ 3,364 | $ 3,360
SVBB | Purchase Money Note |  |  |
Business Acquisition [Line Items] |  |  |
Debt instrument, term |  | 5 years |
Debt instrument, face amount |  | $ 35,000 |
SVBB | Purchase Money Note | Secured Debt |  |  |
Business Acquisition [Line Items] |  |  |
Debt instrument, stated interest rate |  | 3.50% |

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