v3.25.2
Property, Plant and Equipment - Schedule of Reconciliation of Changes in Property, Plant and Equipment (Details) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period ¥ 1,989,777 ¥ 1,691,229
Ending of period 1,968,209 1,989,777
Buildings and structures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 1,171,629 980,578
Ending of period 1,117,720 1,171,629
Machinery and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 395,865 364,763
Ending of period 385,195 395,865
Tools, furniture, and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 49,761 43,660
Ending of period 51,587 49,761
Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 105,572 97,983
Ending of period 104,119 105,572
Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 266,950 204,245
Ending of period 309,589 266,950
Acquisition cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 3,210,478 2,698,984
Additions and other increases 225,155 324,423
Transfers 0 0
Disposals and other decreases (79,245) (70,440)
Reclassification to assets held for sale (Note 19) (38,803) (16,558)
Foreign currency translation differences (44,345) 274,069
Ending of period 3,273,239 3,210,478
Acquisition cost | Buildings and structures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 1,679,054 1,400,108
Additions and other increases 37,969 158,460
Transfers 36,236 26,434
Disposals and other decreases (36,322) (45,337)
Reclassification to assets held for sale (Note 19) (22,552) (9,188)
Foreign currency translation differences (22,509) 148,576
Ending of period 1,671,876 1,679,054
Acquisition cost | Machinery and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 981,944 851,382
Additions and other increases 22,271 27,662
Transfers 48,722 39,784
Disposals and other decreases (29,931) (11,583)
Reclassification to assets held for sale (Note 19) (15,493) (6,236)
Foreign currency translation differences (12,205) 80,936
Ending of period 995,309 981,944
Acquisition cost | Tools, furniture, and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 164,945 141,867
Additions and other increases 10,480 11,508
Transfers 13,185 10,803
Disposals and other decreases (5,668) (10,694)
Reclassification to assets held for sale (Note 19) (346) (483)
Foreign currency translation differences (2,539) 11,946
Ending of period 180,056 164,945
Acquisition cost | Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 105,845 98,227
Additions and other increases 0 5
Transfers 68 0
Disposals and other decreases 0 (9)
Reclassification to assets held for sale (Note 19) (399) (597)
Foreign currency translation differences (1,172) 8,220
Ending of period 104,342 105,845
Acquisition cost | Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period 278,689 207,400
Additions and other increases 154,435 126,788
Transfers (98,211) (77,021)
Disposals and other decreases (7,325) (2,817)
Reclassification to assets held for sale (Note 19) (12) (53)
Foreign currency translation differences (5,920) 24,391
Ending of period 321,656 278,689
Accumulated depreciation and accumulated impairment losses    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (1,220,701) (1,007,755)
Disposals and other decreases 52,298 42,192
Reclassification to assets held for sale (Note 19) 25,968 13,733
Foreign currency translation differences 15,575 (83,078)
Depreciation expenses (173,392) (170,339)
Impairment losses (4,778) (15,454)
Ending of period (1,305,030) (1,220,701)
Accumulated depreciation and accumulated impairment losses | Buildings and structures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (507,425) (419,530)
Disposals and other decreases 19,132 22,173
Reclassification to assets held for sale (Note 19) 14,087 7,961
Foreign currency translation differences 6,892 (36,879)
Depreciation expenses (86,344) (80,067)
Impairment losses (498) (1,082)
Ending of period (554,156) (507,425)
Accumulated depreciation and accumulated impairment losses | Machinery and vehicles    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (586,080) (486,618)
Disposals and other decreases 24,985 8,682
Reclassification to assets held for sale (Note 19) 11,642 5,353
Foreign currency translation differences 6,541 (37,869)
Depreciation expenses (66,372) (71,588)
Impairment losses (830) (4,039)
Ending of period (610,114) (586,080)
Accumulated depreciation and accumulated impairment losses | Tools, furniture, and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (115,184) (98,207)
Disposals and other decreases 5,341 10,127
Reclassification to assets held for sale (Note 19) 192 419
Foreign currency translation differences 1,974 (8,058)
Depreciation expenses (20,676) (18,684)
Impairment losses (116) (781)
Ending of period (128,469) (115,184)
Accumulated depreciation and accumulated impairment losses | Land    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (273) (243)
Disposals and other decreases 0 0
Reclassification to assets held for sale (Note 19) 47 0
Foreign currency translation differences 3 (30)
Depreciation expenses 0 0
Impairment losses 0 0
Ending of period (223) (273)
Accumulated depreciation and accumulated impairment losses | Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning of period (11,739) (3,156)
Disposals and other decreases 2,840 1,210
Reclassification to assets held for sale (Note 19) 0 0
Foreign currency translation differences 166 (242)
Depreciation expenses 0 0
Impairment losses (3,333) (9,552)
Ending of period ¥ (12,068) ¥ (11,739)