Supplemental cash flow information - Additional Information (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of supplement cash flow information [Line Items] | |||
| Other, net | ¥ 1,159,304 | ¥ (494,551) | ¥ (1,392,565) |
| Net increase in time deposits [Member] | |||
| Disclosure of supplement cash flow information [Line Items] | |||
| Other, net | ¥ 1,292,045 | ¥ 666,401 | |