Financial Risk Management - Unused Portions of the Credit Facility (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Commercial paper [member] | ||
| Disclosure of unused portion of borrowing facility [line items] | ||
| Unused portions of the credit facility | ¥ 1,617,134 | ¥ 711,885 |
| Medium-term notes [member] | ||
| Disclosure of unused portion of borrowing facility [line items] | ||
| Unused portions of the credit facility | 6,180,379 | 2,381,972 |
| Credit facility [member] | ||
| Disclosure of unused portion of borrowing facility [line items] | ||
| Unused portions of the credit facility | ¥ 7,797,513 | ¥ 3,093,857 |