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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, 2023 USD ($) ¥ / $ | Dec. 31, 2022 USD ($) ¥ / $ | Dec. 31, 2021 USD ($) ¥ / $
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Weighted-average yen/dollar exchange rate | ¥ / $ | [1] | 140.57 | 130.17 | 109.79
Yen percent strengthening (weakening) |  | (7.40%) | (15.70%) | (2.70%)
Exchange effect on pretax operating earnings (in millions) |  | $ (131) | $ (318) | $ (43)
Yen/dollar exchange rate at December 31 | ¥ / $ | [1] | 141.83 | 132.70 |
Yen percent strengthening (weakening) |  | (6.40%) | (13.30%) |
Exchange effect on total assets |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ (3,984) | $ (11,099) |
Exchange effect on total liabilities |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ (6,936) | $ (9,513) |
[1] | Rates are based on the published MUFG Bank, Ltd. telegraphic transfer middle rate (TTM)

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