| **PARENT COMPANY FINANCIAL INFORMATION - Statements of Operations and Comprehensive Income/Loss (Details) - USD ($) $ in Thousands** | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Condensed Income Statements, Captions [Line Items]**                                                                               |            |   |   |
| Interest expense                                                                                                                     | $ 6,479,742     | $ 2,246,730 | $ 1,103,408 |
| Income tax benefit                                                                                                                   | (146,146)       | 343,123 | 1,083,583 |
| NET INCOME                                                                                                                           | 932,902         | 1,405,007 | 2,982,362 |
| **Other comprehensive income, net of tax:**                                                                                          |            |   |   |
| TOTAL OTHER COMPREHENSIVE INCOME / (LOSS), NET OF TAX                                                                                | 270,455         | (1,147,913) | (354,405) |
| COMPREHENSIVE INCOME ATTRIBUTABLE TO SHUSA                                                                                           | 1,203,357       | 257,094 | 2,627,957 |
| Parent Company                                                                                                                       |            |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                               |            |   |   |
| Interest income                                                                                                                      | 288,045         | 247,043 | 289,846 |
| Income/(expense) from equity method investments                                                                                      | 37              | (1,355) | 59 |
| Other income                                                                                                                         | 111,283         | 84,363 | 75,387 |
| Total income                                                                                                                         | 2,578,328       | 4,870,051 | 701,445 |
| Interest expense                                                                                                                     | 484,058         | 357,727 | 369,861 |
| Other expense                                                                                                                        | 318,472         | 297,162 | 279,697 |
| Total expense                                                                                                                        | 802,530         | 654,889 | 649,558 |
| Income before income taxes and equity in net income/(loss) less dividends from subsidiaries                                          | 1,775,798       | 4,215,162 | 51,887 |
| Income tax benefit                                                                                                                   | (168,423)       | (72,191) | (38,800) |
| Income/(loss) before equity in net income/(loss) less dividends from subsidiaries                                                    | 1,944,221       | 4,287,353 | 90,687 |
| Equity in net (loss)/income less dividends from bank subsidiaries                                                                    | (27,186)        | 341,935 | 463,075 |
| Equity in net (loss)/income less dividends from non-bank subsidiaries                                                                | (984,133)       | (3,224,281) | 2,428,600 |
| NET INCOME                                                                                                                           | 932,902         | 1,405,007 | 2,982,362 |
| **Other comprehensive income, net of tax:**                                                                                          |            |   |   |
| Net unrealized gains/(losses) on cash flow hedge derivative financial instruments                                                    | 261,145         | (435,647) | (158,184) |
| Net unrealized gains/(losses) recognized on investment securities                                                                    | 6,021           | (716,667) | (197,168) |
| Pension and post-retirement actuarial gains, net of tax                                                                              | 3,289           | 4,401 | 947 |
| TOTAL OTHER COMPREHENSIVE INCOME / (LOSS), NET OF TAX                                                                                | 270,455         | (1,147,913) | (354,405) |
| COMPREHENSIVE INCOME ATTRIBUTABLE TO SHUSA                                                                                           | 1,203,357       | 257,094 | 2,627,957 |
| Parent Company | Subsidiary Banks                                                                                                    |            |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                               |            |   |   |
| Dividends                                                                                                                            | 420,000         | 40,000 | 40,000 |
| Parent Company | Non-Bank Subsidiaries                                                                                               |            |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                               |            |   |   |
| Dividends                                                                                                                            | $ 1,758,963     | $ 4,500,000 | $ 296,153 |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount of operating dividend income on securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) for proportionate share of equity method investee's income (loss).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount of income related to nonoperating activities, classified as other.
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