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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Yen/Dollar Exchange Rates Used (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) ¥ / $ | Dec. 31, 2023 USD ($) ¥ / $ | Dec. 31, 2022 USD ($) ¥ / $
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Weighted-average yen/dollar exchange rate | ¥ / $ | [1] | 150.97 | 140.57 | 130.17
Yen percent strengthening (weakening) |  | (6.90%) | (7.40%) | (15.70%)
Exchange effect on pretax operating earnings (in millions) |  | $ (125) | $ (131) | $ (318)
Yen/dollar exchange rate at December 31 | ¥ / $ | [1] | 158.18 | 141.83 |
Yen percent strengthening (weakening) |  | (10.30%) | (6.40%) |
Exchange effect on total assets |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ (6,127) | $ (3,984) |
Exchange effect on total liabilities |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ (9,624) | $ (6,936) |
[1] | Rates are based on the published MUFG Bank, Ltd. telegraphic transfer middle rate (TTM).

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