v3.25.2
Employee benefits - Summary of Amounts Recognized in Relation to Net Defined Benefit Liability Asset in Statements of Financial Position (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of defined benefit plans [line items]    
Net defined benefit asset ¥ (86,914) ¥ (71,536)
Japanese Defined Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Present value of defined benefit obligations 488,818 543,292
Fair value of plan assets (439,943) (464,376)
The impact of minimum funding requirement and asset ceiling 10,147 9,837
Net defined benefit asset (84,009) (69,208)
Net defined benefit liability 143,031 157,961
Net amount 59,022 88,753
Foreign Defined Benefit Plan [Member]    
Disclosure of defined benefit plans [line items]    
Present value of defined benefit obligations 130,259 126,987
Fair value of plan assets (49,648) (47,893)
The impact of minimum funding requirement and asset ceiling 3,225 3,457
Net defined benefit asset (2,905) (2,328)
Net defined benefit liability 86,741 84,879
Net amount ¥ 83,836 ¥ 82,551