Right of Use Assets and Lease Liabilities - Summary of Gains and Losses on Lessee's Leases (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of quantitative information about lease costs [Line items] | |||
| Depreciation of right of use assets | ¥ 221,871 | ¥ 100,838 | ¥ 121,698 |
| Interest expense on lease liabilities | 5,023 | 4,331 | 6,152 |
| Short-term leases | 124,636 | 117,834 | 103,544 |
| Total | 351,531 | 223,003 | 231,394 |
| Land [Member] | |||
| Disclosure of quantitative information about lease costs [Line items] | |||
| Depreciation of right of use assets | 7,796 | 5,094 | 9,699 |
| Buildings [Member] | |||
| Disclosure of quantitative information about lease costs [Line items] | |||
| Depreciation of right of use assets | 55,911 | 52,178 | 69,962 |
| Other [Member] | |||
| Disclosure of quantitative information about lease costs [Line items] | |||
| Depreciation of right of use assets | ¥ 158,164 | ¥ 43,566 | ¥ 42,038 |