v3.26.1
Property Plant and Equipment - Changes in Cost, Accumulated Depreciation and Impairment Losses, and the Carrying Amounts of Property, Plant and Equipment (Detail) - Property, plant and equipment [member] - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance ¥ 3,209,921  
Ending balance 3,196,382 ¥ 3,209,921
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 11,113,036 11,004,888
Additions 838,443 612,666
Reclassification
Sales or disposal (463,500) (344,440)
Transfers to assets held for sale (225,510)  
Exchange differences on translating foreign operations 577,484 (151,828)
Other (12,069) (8,250)
Ending balance 11,827,884 11,113,036
Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (7,903,115) (7,770,475)
Depreciation (487,653) (531,809)
Impairment losses (402,122)  
Sales or disposal 418,681 301,518
Transfers to assets held for sale 178,672  
Exchange differences on translating foreign operations (435,833) 111,085
Other (132) (13,434)
Ending balance (8,631,502) (7,903,115)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 652,478  
Ending balance 655,174 652,478
Land [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 681,258 674,562
Additions 8,500 14,867
Reclassification 4,372 3,336
Sales or disposal (3,414) (9,128)
Transfers to assets held for sale (16,578)  
Exchange differences on translating foreign operations 14,813 (2,385)
Other 154 6
Ending balance 689,105 681,258
Land [member] | Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (28,780) (25,442)
Depreciation (6,988) (6,399)
Impairment losses (291)  
Sales or disposal 1,365 3,372
Transfers to assets held for sale 1,447  
Exchange differences on translating foreign operations (473) 44
Other (211) (355)
Ending balance (33,931) (28,780)
Buildings and structures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,101,044  
Ending balance 1,151,040 1,101,044
Buildings and structures [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 3,005,496 2,954,398
Additions 44,656 36,761
Reclassification 84,869 84,185
Sales or disposal (100,687) (39,708)
Transfers to assets held for sale (43,796)  
Exchange differences on translating foreign operations 128,530 (26,961)
Other (916) (3,179)
Ending balance 3,118,152 3,005,496
Buildings and structures [member] | Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,904,452) (1,845,450)
Depreciation (108,060) (106,045)
Impairment losses (530)  
Sales or disposal 95,110 34,386
Transfers to assets held for sale 30,728  
Exchange differences on translating foreign operations (80,152) 15,566
Other 244 (2,909)
Ending balance (1,967,112) (1,904,452)
Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,161,257  
Ending balance 1,079,299 1,161,257
Machinery and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 7,130,701 7,156,049
Additions 80,698 98,025
Reclassification 239,373 292,186
Sales or disposal (356,226) (295,604)
Transfers to assets held for sale (164,120)  
Exchange differences on translating foreign operations 405,163 (117,006)
Other (7,179) (2,949)
Ending balance 7,328,410 7,130,701
Machinery and equipment [member] | Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (5,969,444) (5,899,182)
Depreciation (372,605) (419,365)
Impairment losses (27,463)  
Sales or disposal 322,206 263,760
Transfers to assets held for sale 146,497  
Exchange differences on translating foreign operations (348,101) 95,475
Other (201) (10,132)
Ending balance (6,249,111) (5,969,444)
Construction in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 295,142  
Ending balance 310,869 295,142
Construction in progress [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 295,581 219,879
Additions 704,589 463,013
Reclassification (328,614) (379,707)
Sales or disposal (3,173)
Transfers to assets held for sale (1,016)  
Exchange differences on translating foreign operations 28,978 (5,476)
Other (4,128) (2,128)
Ending balance 692,217 295,581
Construction in progress [member] | Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (439) (401)
Depreciation
Impairment losses (373,838)  
Sales or disposal
Transfers to assets held for sale  
Exchange differences on translating foreign operations (7,107)
Other 36 (38)
Ending balance ¥ (381,348) ¥ (439)