v3.25.2
Employee benefits - Summary of Fair Value of Plan Assets Foreign Defined Benefit Plans (Detail) - Foreign Defined Benefit Plan [Member] - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents ¥ 4,599 ¥ 4,692
Equity securities [1] 101 84
Fixed income securities contributed to fair value of plan assets [Abstract]    
Government bonds [2] 1,207 1,152
Corporate bonds [3] 175 160
Asset-backed securities 43 36
Insurance contracts [4] 23,057 21,736
Commingled funds [5] 16,929 16,682
Real estate and other 3,537 3,351
Total 49,648 47,893
Quoted Market Prices in Active Market [Member]    
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents 4,599 4,692
Equity securities [1] 101 84
Fixed income securities contributed to fair value of plan assets [Abstract]    
Insurance contracts [4] 334 359
Real estate and other   10
Total 5,034 5,145
Unquoted Market Prices in Active Market [Member]    
Fixed income securities contributed to fair value of plan assets [Abstract]    
Government bonds [2] 1,207 1,152
Corporate bonds [3] 175 160
Asset-backed securities 43 36
Insurance contracts [4] 22,723 21,377
Commingled funds [5] 16,929 16,682
Real estate and other 3,537 3,341
Total ¥ 44,614 ¥ 42,748
[1] Represents primarily foreign equity securities.
[2] Includes primarily foreign government debt securities.
[3] Includes primarily foreign corporate debt securities.
[4] Represents annuity contracts with or without profit sharing and bulk insurance contracts.
[5] Commingled funds represent pooled institutional investments, including primarily investment trusts.