Derivative financial instruments - Additional Information (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Text block 1 [Abstract] | |||
| Gain/Loss on derivative transactions | ¥ (80,831) | ¥ (267,190) | ¥ (129,782) |
| The aggregate fair value amount of derivative financial instruments that contain credit risk related contingent features that are in a net liability position after being offset by cash collateral | 20,213 | 13,166 | |
| The aggregate fair value amount of assets that are already posted as cash collateral | 87,644 | ¥ 98,840 | |
| The maximum amount of assets to be posted or for which Toyota could be required to settle the contracts if the ratings of Toyota decline below specified thresholds | ¥ 20,213 | ||