Short-term borrowings and long-term debt - Summary of Short-Term Borrowings and Long-Term Debt (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	¥ 51,183	¥ 1,843,959
Long-term debt
Long-term loans	516,460	1,090,427
Unsecured bonds	474,343	664,390
Total	990,803	1,754,817
Less - Portion due within one year	166,410	196,950
Non-current portion of non-current borrowings	¥ 824,393	¥ 1,557,867
Short-term borrowings [member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	1.86%	2.13%
Long-term loans [member] \| Bottom of range [member]
Long-term debt
Borrowings, maturity	2026	2025
Long-term loans [member] \| Top of range [member]
Long-term debt
Borrowings, maturity	2040	2058
Long-term loans [member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	3.21%	1.81%
Unsecured Bonds [Member] \| Bottom of range [member]
Long-term debt
Borrowings, maturity	2026	2025
Unsecured Bonds [Member] \| Top of range [member]
Long-term debt
Borrowings, maturity	2035	2035
Unsecured Bonds [Member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	0.70%	0.66%

The amount of bonds issued by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The maturity of borrowings. [Refer: Borrowings]

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The current portion of non-current borrowings. [Refer: Borrowings]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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The amount of loans received.

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The non-current portion of non-current borrowings. [Refer: Borrowings]

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The amount of current borrowings. [Refer: Borrowings]

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Long Term Debt.

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No definition available.

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