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Pension Plans (Funded Status of Defined Benefit Pension Plans) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
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 ¥ 109,759 ¥ 111,010  
Service cost 5,542 5,704 ¥ 6,058
Interest cost 1,216 731 791
Actuarial loss (income) (3,586) (6,538)  
Plan participant's contributions 0 0  
Benefits paid (5,014) (4,770)  
Business combinations 0 4,733  
Divestitures (2,808) 0  
Plan amendments 0 (1,111)  
Foreign currency exchange rate change 0 0  
Benefit obligation at end of year 105,109 109,759 111,010
Change in plan assets:      
Fair value of plan assets at beginning of year 136,803 137,317  
Actual return on plan assets 12,103 (3,108)  
Employer contribution 4,195 4,162  
Plan participant's contributions 0 0  
Benefits paid (4,392) (3,913)  
Business combinations 0 2,456  
Divestitures (5,608) 0  
Plan amendments 0 (111)  
Foreign currency exchange rate change 0 0  
Fair value of plan assets at end of year 143,101 136,803 137,317
The funded status of the plans 37,992 27,044  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in other assets 53,641 42,337  
Accrued benefit liability included in other liabilities (15,649) (15,293)  
Net amount recognized 37,992 27,044  
Overseas plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 108,416 121,148  
Service cost 2,999 3,432 3,947
Interest cost 3,395 2,309 1,329
Actuarial loss (income) 3,448 (25,124)  
Plan participant's contributions 233 334  
Benefits paid (2,499) (1,131)  
Business combinations 0 196  
Divestitures 0 0  
Plan amendments 360 (285)  
Foreign currency exchange rate change 13,582 7,537  
Benefit obligation at end of year 129,934 108,416 121,148
Change in plan assets:      
Fair value of plan assets at beginning of year 122,204 127,251  
Actual return on plan assets 15,799 (15,709)  
Employer contribution 2,262 2,927  
Plan participant's contributions 233 334  
Benefits paid (2,314) (962)  
Business combinations 0 175  
Divestitures 0 0  
Plan amendments 0 0  
Foreign currency exchange rate change 15,619 8,188  
Fair value of plan assets at end of year 153,803 122,204 ¥ 127,251
The funded status of the plans 23,869 13,788  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in other assets 25,723 15,465  
Accrued benefit liability included in other liabilities (1,854) (1,677)  
Net amount recognized ¥ 23,869 ¥ 13,788