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Pension Plans (Summary of Projected Benefit Obligations and Fair Value of Plan Assets for Pension Plans) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Japan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligations | ¥ 17,856 | ¥ 13,811
Fair value of plan assets | 2,563 | 0
Overseas plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligations | 7,307 | 8,484
Fair value of plan assets | ¥ 5,630 | ¥ 6,834

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