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Pension Plans (Funded Status of Defined Benefit Pension Plans) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Change in benefit obligation:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax  
Japan      
Change in benefit obligation:      
Benefit obligation at beginning of year ¥ 105,109 ¥ 109,759  
Service cost 5,078 5,542 ¥ 5,704
Interest cost 1,421 1,216 731
Actuarial loss (income) (7,621) (3,586)  
Plan participant's contributions 0 0  
Benefits paid (5,032) (5,014)  
Business combinations 86 0  
Divestitures (1,937) (2,808)  
Plan amendments 0 0  
Settlements (3,300) 0  
Foreign currency exchange rate change 0 0  
Benefit obligation at end of year 93,804 105,109 109,759
Change in plan assets:      
Fair value of plan assets at beginning of year 143,101 136,803  
Actual return on plan assets 449 12,103  
Employer contribution 3,855 4,195  
Plan participant's contributions 0 0  
Benefits paid (4,404) (4,392)  
Divestitures (3,272) (5,608)  
Settlements (2,017) 0  
Foreign currency exchange rate change 0 0  
Fair value of plan assets at end of year 137,712 143,101 136,803
The funded status of the plans 43,908 37,992  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in other assets 59,111 53,641  
Accrued benefit liability included in other liabilities (15,203) (15,649)  
Net amount recognized 43,908 37,992  
Overseas plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 129,934 108,416  
Service cost 3,268 2,999 3,432
Interest cost 4,091 3,395 2,309
Actuarial loss (income) (11,712) 3,448  
Plan participant's contributions 233 233  
Benefits paid (2,375) (2,499)  
Business combinations 0 0  
Divestitures 0 0  
Plan amendments 179 360  
Settlements 0 0  
Foreign currency exchange rate change (874) 13,582  
Benefit obligation at end of year 122,744 129,934 108,416
Change in plan assets:      
Fair value of plan assets at beginning of year 153,803 122,204  
Actual return on plan assets (1,435) 15,799  
Employer contribution 2,446 2,262  
Plan participant's contributions 233 233  
Benefits paid (2,182) (2,314)  
Divestitures 0 0  
Settlements 0 0  
Foreign currency exchange rate change (1,046) 15,619  
Fair value of plan assets at end of year 151,819 153,803 ¥ 122,204
The funded status of the plans 29,075 23,869  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in other assets 30,809 25,723  
Accrued benefit liability included in other liabilities (1,734) (1,854)  
Net amount recognized ¥ 29,075 ¥ 23,869