| **LOANS AND ALLOWANCE FOR CREDIT LOSSES (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |             |
|---------------------------------------------------------------------------------------------------------------------------|----------------|----------------|-------------|
||
| **Allowance for Loan Losses [Roll Forward]**                                                                              |           |           |        |   |   |
| Allowance for loan losses, beginning of period                                                                            | $ 3,070,458    | $ 1,425,856    | $ 2,108,817 | $ 834,337 |   |
| Provision for/ (Recovery of) loan losses                                                                                  | 854,180        | 1,033,357      | 2,723,118   | 2,099,721 |   |
| Other                                                                                                                     |           | (61,220)       | (27,117)    | (61,220) |   |
| Charge-offs                                                                                                               | (1,533,731)    | (1,010,199)    | (3,433,650) | (1,825,242) |   |
| Recoveries                                                                                                                | 521,439        | 417,595        | 1,541,178   | 757,793 |   |
| Charge-offs, net of recoveries                                                                                            | (1,012,292)    | (592,604)      | (1,892,472) | (1,067,449) |   |
| Allowance for loan losses, end of period                                                                                  | 2,912,346      | 1,805,389      | 2,912,346   | 1,805,389 |   |
| Reserve for unfunded lending commitments, beginning of period                                                             | 137,641        | 170,274        | 132,641     | 220,000 |   |
| Provision for unfunded lending commitments                                                                                | 0              | (20,000)       | 5,000       | (65,000) |   |
| Loss on unfunded lending commitments                                                                                      | 0              | (633)          | 0           | (5,359) |   |
| Reserve for unfunded lending commitments, end of period                                                                   | 137,641        | 149,641        | 137,641     | 149,641 |   |
| Total allowance for credit losses, end of period                                                                          | 3,049,987      | 1,955,030      | 3,049,987   | 1,955,030 |   |
| Ending balance, individually evaluated for impairment                                                                     | 412,302        | 208,757        | 412,302     | 208,757 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 2,500,044      | 1,596,632      | 2,500,044   | 1,596,632 |   |
| **Financing receivables:**                                                                                                |           |           |        |   |   |
| Ending balance                                                                                                            | 81,700,429     | 74,803,876     | 81,700,429  | 74,803,876 |   |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                      | 3,364,866      | 1,303,570      | 3,364,866   | 1,303,570 |   |
| Ending balance, individually evaluated for impairment                                                                     | 4,029,493      | 1,501,585      | 4,029,493   | 1,501,585 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 74,306,070     | 71,998,721     | 74,306,070  | 71,998,721 |   |
| Sale of TDRs and NPLs classified as held-for-sale                                                                         |           | 484,000        |        |   |   |
| Commercial                                                                                                                |           |           |        |   |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                              |           |           |        |   |   |
| Allowance for loan losses, beginning of period                                                                            | 414,462        | 359,811        | 396,489     | 443,074 |   |
| Provision for/ (Recovery of) loan losses                                                                                  | 4,824          | 31,506         | 59,745      | (8,990) |   |
| Other                                                                                                                     |           |           | 0           |   |   |
| Charge-offs                                                                                                               | (45,440)       | (28,680)       | (96,561)    | (81,157) |   |
| Recoveries                                                                                                                | 25,091         | 8,841          | 39,264      | 18,551 |   |
| Charge-offs, net of recoveries                                                                                            | (20,349)       | (19,839)       | (57,297)    | (62,606) |   |
| Allowance for loan losses, end of period                                                                                  | 398,937        | 371,478        | 398,937     | 371,478 |   |
| Reserve for unfunded lending commitments, beginning of period                                                             | 137,641        | 170,274        | 132,641     | 220,000 |   |
| Provision for unfunded lending commitments                                                                                | 0              | (20,000)       | 5,000       | (65,000) |   |
| Loss on unfunded lending commitments                                                                                      | 0              | (633)          | 0           | (5,359) |   |
| Reserve for unfunded lending commitments, end of period                                                                   | 137,641        | 149,641        | 137,641     | 149,641 |   |
| Total allowance for credit losses, end of period                                                                          | 536,578        | 521,119        | 536,578     | 521,119 |   |
| Ending balance, individually evaluated for impairment                                                                     | 56,787         | 73,193         | 56,787      | 73,193 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 342,150        | 298,285        | 342,150     | 298,285 |   |
| **Financing receivables:**                                                                                                |           |           |        |   |   |
| Ending balance                                                                                                            | 39,824,202     | 35,683,403     | 39,824,202  | 35,683,403 |   |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                      | 0              | 19,167         | 0           | 19,167 |   |
| Ending balance, individually evaluated for impairment                                                                     | 367,871        | 502,922        | 367,871     | 502,922 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 39,456,331     | 35,161,314     | 39,456,331  | 35,161,314 |   |
| Consumer                                                                                                                  |           |           |        |   |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                              |           |           |        |   |   |
| Allowance for loan losses, beginning of period                                                                            | 2,584,404      | 1,027,044      | 1,679,304   | 363,647 |   |
| Provision for/ (Recovery of) loan losses                                                                                  | 875,614        | 1,012,355      | 2,651,063   | 2,107,830 |   |
| Other                                                                                                                     |           | (61,220)       | (27,117)    | (61,220) |   |
| Charge-offs                                                                                                               | (1,488,291)    | (981,519)      | (3,337,089) | (1,744,085) |   |
| Recoveries                                                                                                                | 496,348        | 408,754        | 1,501,914   | 739,242 |   |
| Charge-offs, net of recoveries                                                                                            | (991,943)      | (572,765)      | (1,835,175) | (1,004,843) |   |
| Allowance for loan losses, end of period                                                                                  | 2,468,075      | 1,405,414      | 2,468,075   | 1,405,414 |   |
| Total allowance for credit losses, end of period                                                                          | 2,468,075      | 1,405,414      | 2,468,075   | 1,405,414 |   |
| Ending balance, individually evaluated for impairment                                                                     | 355,515        | 135,564        | 355,515     | 135,564 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 2,112,560      | 1,269,850      | 2,112,560   | 1,269,850 |   |
| **Financing receivables:**                                                                                                |           |           |        |   |   |
| Ending balance                                                                                                            | 41,876,227     | 39,120,473     | 41,876,227  | 39,120,473 |   |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                      | 3,364,866      | 1,284,403      | 3,364,866   | 1,284,403 |   |
| Ending balance, individually evaluated for impairment                                                                     | 3,661,622      | 998,663        | 3,661,622   | 998,663 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 34,849,739     | 36,837,407     | 34,849,739  | 36,837,407 |   |
| Consumer | Retail installment contracts and auto loans                                                                    |           |           |        |   |   |
| **Financing receivables:**                                                                                                |           |           |        |   |   |
| Loans held-for-sale                                                                                                       |           |           |        |   | $ 1,000,000 |
| Unallocated                                                                                                               |           |           |        |   |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                              |           |           |        |   |   |
| Allowance for loan losses, beginning of period                                                                            | 71,592         | 39,001         | 33,024      | 27,616 |   |
| Provision for/ (Recovery of) loan losses                                                                                  | (26,258)       | (10,504)       | 12,310      | 881 |   |
| Other                                                                                                                     |           |           | 0           |   |   |
| Charge-offs                                                                                                               | 0              | 0              | 0           | 0 |   |
| Recoveries                                                                                                                | 0              | 0              | 0           | 0 |   |
| Charge-offs, net of recoveries                                                                                            | 0              | 0              | 0           | 0 |   |
| Allowance for loan losses, end of period                                                                                  | 45,334         | 28,497         | 45,334      | 28,497 |   |
| Total allowance for credit losses, end of period                                                                          | 45,334         | 28,497         | 45,334      | 28,497 |   |
| Ending balance, individually evaluated for impairment                                                                     | 0              | 0              | 0           | 0 |   |
| Ending balance, collectively evaluated for impairment                                                                     | 45,334         | 28,497         | 45,334      | 28,497 |   |
| **Financing receivables:**                                                                                                |           |           |        |   |   |
| Ending balance                                                                                                            | 0              | 0              | 0           | 0 |   |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                      | 0              | 0              | 0           | 0 |   |
| Ending balance, individually evaluated for impairment                                                                     | 0              | 0              | 0           | 0 |   |
| Ending balance, collectively evaluated for impairment                                                                     | $ 0            | $ 0            | $ 0         | $ 0 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible and reserve for unfunded lending commitments.
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No definition available.
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Net amount of direct write-downs and recoveries of financing receivables charged against the allowance.
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Gain (Loss) on Unfunded Commitments
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Increase (Decrease) in Allowance for Credit Losses from Sale of Troubled Debt Restructuring and Non-performing Loans Held-for-sale
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Loans Receivable Held-for-sale, Net, Fair Value Option
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| - Definition
Net change in reserve for unfunded commitments which is included in the provision for credit losses.
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Reserve for unfunded loan commitments and letters of credit.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios.
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| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
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| - Definition
Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
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| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
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The balance of financing receivables that were collectively evaluated for impairment.
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The balance of financing receivables that were individually evaluated for impairment.
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| - Definition
Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
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No definition available.
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| - Definition
Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.
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| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
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