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Segment Information (Reconciliation of Segment Totals to Consolidated Financial Statement Amounts) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Segment revenues:      
Revenues ¥ 2,874,821 ¥ 2,814,361 ¥ 2,663,659
Segment profits:      
Total segment profits 331,826 360,713 335,923
Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests (394) (137) (32)
Income before Income Taxes 480,463 469,975 392,178
Segment assets:      
Assets 16,866,251 16,322,100 15,289,385
Operating Segment      
Segment revenues:      
Revenues 2,871,405 2,804,921 2,661,264
Segment profits:      
Total segment profits 544,668 561,521 448,510
Segment assets:      
Assets 16,456,627 16,022,129 14,703,812
Corporate, Non-Segment      
Segment revenues:      
Revenues 64,628 64,922 51,993
Segment profits:      
Corporate losses (64,475) (84,644) (64,337)
Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests 270 (6,902) 8,005
Segment assets:      
Assets 2,494,395 2,307,313 2,760,471
Intersegment Eliminations      
Segment revenues:      
Revenues (61,212) (55,482) (49,598)
Segment assets:      
Assets ¥ (2,084,771) ¥ (2,007,342) ¥ (2,174,898)