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, 2025	Mar. 31, 2024
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	¥ 1,843,959	¥ 1,812,605
Long-term debt
Long-term loans	1,090,427	1,160,024
Unsecured bonds	664,390	544,078
Lease liabilities	599,470	571,726
Total	2,354,287	2,275,828
Less — Portion due within one year	287,445	217,711
Non-current portion of non-current borrowings	¥ 2,066,842	¥ 2,058,117
Short-term borrowings [member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	2.13%	2.64%
Long-term loans [member] \| Bottom of range [member]
Long-term debt
Borrowings, maturity	2025	2024
Long-term loans [member] \| Top of range [member]
Long-term debt
Borrowings, maturity	2058	2058
Long-term loans [member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	1.81%	1.90%
Unsecured Bonds [Member] \| Bottom of range [member]
Long-term debt
Borrowings, maturity	2025	2024
Unsecured Bonds [Member] \| Top of range [member]
Long-term debt
Borrowings, maturity	2035	2034
Unsecured Bonds [Member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	0.66%	0.41%
Lease liabilities [member] \| Weighted average [member]
Long-term debt
Borrowings, interest rate	2.74%	2.53%

The amount of bonds issued by the entity.

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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 liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

Long Term Debt.

+ References

No definition available.

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