Trade Accounts and Other Receivables - Summary of Changes in the Allowance for Doubtful Accounts (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Text block 1 [Abstract] | ||
| Allowance for doubtful accounts at beginning of year | ¥ 122,105 | ¥ 121,628 |
| Provision for doubtful accounts, net of reversal | 9,835 | 4,708 |
| Write-offs | (3,128) | (3,759) |
| Other | (1,516) | (472) |
| Allowance for doubtful accounts at end of year | ¥ 127,296 | ¥ 122,105 |