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ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 06, 2022 USD ($) branch $ / shares shares | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Feb. 18, 2022 USD ($) branch
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 8,173 | $ 8,188 | $ 8,173 | $ 7,116 |
Credit mark on PCD loans | $ 101 |  |  |  |  |  |
Income before income tax expense |  |  |  | 2,030 | 2,655 | 2,977 |
Cumulative costs incurred in connection with acquisition |  | $ 13 |  |  |  |  |
Allowance on PCD loans and leases at acquisition |  |  |  |  | 101 |  |
Provision expense (benefit) for loans and leases |  |  |  | $ 724 | $ 394 | $ (360) |
Financial Asset Acquired and No Credit Deterioration |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Provision expense (benefit) for loans and leases |  |  | $ 145 |  |  |  |
Online Deposit Business And 80 East Coast Branches Of HSBC Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  | $ 6,300
Loans receivable, net |  |  |  |  |  |  | 1,500
Goodwill |  |  |  |  |  |  | $ 120
Online Deposit Business And 80 East Coast Branches Of HSBC Bank | New York City Metro |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  |  |  |  |  |  | 66
Online Deposit Business And 80 East Coast Branches Of HSBC Bank | Mid-Atlantic/Washington D.C. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  |  |  |  |  |  | 9
Online Deposit Business And 80 East Coast Branches Of HSBC Bank | Southeast Florida |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch |  |  |  |  |  |  | 5
Investors Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | branch | 154 |  |  |  |  |  |
Goodwill | $ 887 |  |  |  |  |  |
Number of shares issued for acquisition | shares | 73,600,000 |  |  |  |  |  |
Cash consideration, in dollars per share for each share of investors stock (in dollars per share) | $ / shares | $ 1.46 |  |  |  |  |  |
Stock options granted (in shares) | shares | 1,151,301 |  |  |  |  |  |
Accretable discount on PCD loans | $ 320 |  |  |  |  |  |
Accretable discount on PCD loans, interest rate mark | 179 |  |  |  |  |  |
Accretable discount on non-PCD loans, credit mark | 141 |  |  |  |  |  |
Intangible asset, amortization period |  |  |  | 10 years |  |  |
Allowance on PCD loans and leases at acquisition | 101 |  |  |  |  |  |
Fair value of acquired receivables | 20,139 |  |  |  |  |  |
Unpaid principal balance of acquired receivables | 20,560 |  |  |  |  |  |
Investors Acquisition | Acquisition-related Costs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Income before income tax expense |  |  |  | $ 335 |  |  |
Provision expense (benefit) for loans and leases |  |  |  | $ 145 |  |  |
Investors Acquisition | Financial Asset Acquired and No Credit Deterioration |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired receivables | 15,600 |  |  |  |  |  |
Unpaid principal balance of acquired receivables | 15,900 |  |  |  |  |  |
Investors Acquisition | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired receivables | 4,500 |  |  |  |  |  |
Unpaid principal balance of acquired receivables | $ 4,700 |  |  |  |  |  |
Investors Acquisition | Restricted Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Awards granted (in shares) | shares | 259,316 |  |  |  |  |  |
Investors Acquisition | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stock consideration (in dollars per each share) | $ / shares | $ 0.297 |  |  |  |  |  |

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