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BUSINESS SEGMENT AND FOREIGN INFORMATION - Yen/Dollar Exchange Rates Used (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) ¥ / $ | Dec. 31, 2018 USD ($) ¥ / $ | Dec. 31, 2017 USD ($) ¥ / $
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Weighted-average yen/dollar exchange rate | ¥ / $ | [1] | 109.07 | 110.39 | 112.16
Yen percent strengthening (weakening) |  | 1.20% | 1.60% | (3.10%)
Exchange effect on pretax operating earnings (in millions) |  | $ 20 | $ 38 | $ (63)
Yen/dollar exchange rate at December 31 | ¥ / $ | [1] | 109.56 | 111.00 |
Yen percent strengthening (weakening) |  | 1.30% | 1.80% |
Exchange effect on total assets |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ 1,225 | $ 1,362 |
Exchange effect on total liabilities |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Exchange effect |  | $ 1,533 | $ 1,270 |
[1] | Rates are based on the published MUFG Bank, Ltd. telegraphic transfer middle rate (TTM)

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