Equity and Other Equity Items - Disclosure of Matters Relating To Repurchase (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| May 10, 2023 [member] | |||
| Disclosure of treasury shares [Line items] | |||
| Number of common shares repurchased | 64,590,700 | ||
| Total purchase price for repurchase of shares | ¥ 150,000 | ||
| November 1, 2023 [member] | |||
| Disclosure of treasury shares [Line items] | |||
| Number of common shares repurchased | 5,216,600 | 26,880,600 | |
| Total purchase price for repurchase of shares | ¥ 18,962 | ¥ 81,037 | |
| May 8, 2024 and september 24, 2024 [member] | |||
| Disclosure of treasury shares [Line items] | |||
| Number of common shares repurchased | 16,226,100 | 420,633,175 | |
| Total purchase price for repurchase of shares | ¥ 39,949 | ¥ 1,160,051 | |
| May 8, 2024 [member] | |||
| Disclosure of treasury shares [Line items] | |||
| Number of common shares retired | 520,000,000 | ||