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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 04, 2023 | Mar. 27, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net interest income |  |  | $ 1,821 | $ 1,961 | $ 3,638 | $ 2,811 |
Noninterest income |  |  | 639 | 658 | 1,266 | 10,917 |
Net income |  |  | $ 707 | $ 682 | $ 1,438 | 10,200 |
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 |  |  |  |  |
SVB |  |  |  |  |  |  |
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 |  |  |  |  |
Share-Loss Agreement, true-up payment term |  | 45 days |  |  |  |  |
True-up amount |  | $ 1,500 |  |  |  |  |
Cash settled value appreciation instrument issued and issuable (in shares) |  | 5 |  |  |  |  |
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
UPB |  | 71,287 |  |  |  |  |
Purchase accounting adjustment of discount |  | 2,300 |  |  |  |  |
Net interest income |  |  |  |  |  | 700 |
Noninterest income |  |  |  |  |  | 183 |
Net income |  |  |  |  |  | $ 224 |
SVB | Non-PCD |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans and leases acquired, FV |  | 66,420 |  |  |  |  |
UPB |  | $ 68,719 |  |  |  |  |
SVB | FDIC Credit Facility |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
FHLB, advances, interest rate |  | 0.00% |  |  |  |  |
SVB | Secured Debt | FDIC Credit Facility |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.25% |  |  |  |  |
SVB | Purchase Money Note |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |
Debt instrument, face amount |  | $ 35,000 |  |  |  |  |
SVB | Purchase Money Note | Secured Debt |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt instrument, stated interest rate |  | 3.50% |  |  |  |  |

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