v3.25.2
Financial liabilities - Summary of Financial Liabilities (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance ¥ 36,561,780 ¥ 29,380,273
Cash flow 2,584,995 3,706,760
Acquisitions 164,348 101,534
Changes in foreign currency exchange rates (535,545) 3,372,889
Other 17,301 324
Ending balance 38,792,879 36,561,780
Current liabilities [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 15,406,284 12,305,639
Cash flow (10,796,586) (8,350,589)
Reclassification 11,440,383 10,051,801
Changes in foreign currency exchange rates (241,512) 1,418,811
Other 20,947 (19,378)
Ending balance 15,829,516 15,406,284
Current liabilities [Member] | Short-term debt [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 5,487,959 4,590,173
Cash flow 75,675 401,740
Changes in foreign currency exchange rates (99,165) 519,138
Other 0 (23,093)
Ending balance 5,464,469 5,487,959
Current liabilities [Member] | Current portion of long-term debt [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 9,844,870 7,648,596
Cash flow (10,786,012) (8,673,349)
Reclassification 11,336,112 9,974,103
Changes in foreign currency exchange rates (141,748) 896,377
Other 19,679 (858)
Ending balance 10,272,900 9,844,870
Current liabilities [Member] | Current portion of long-term lease liabilities [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 73,456 66,870
Cash flow (86,249) (78,981)
Reclassification 104,271 77,698
Changes in foreign currency exchange rates (599) 3,295
Other 1,268 4,573
Ending balance 92,147 73,456
Non current liabilities [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 21,155,496 17,074,634
Cash flow 13,381,581 12,057,349
Acquisitions 164,348 101,534
Reclassification (11,440,383) (10,051,801)
Changes in foreign currency exchange rates (294,033) 1,954,078
Other (3,646) 19,702
Ending balance 22,963,363 21,155,496
Non current liabilities [Member] | Long-term debt [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 20,766,384 16,685,384
Cash flow 13,381,581 12,057,349
Reclassification (11,336,112) (9,974,103)
Changes in foreign currency exchange rates (290,753) 1,933,312
Other 1,059 64,442
Ending balance 22,522,158 20,766,384
Non current liabilities [Member] | Long-term lease liabilities [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 389,112 389,250
Acquisitions 164,348 101,534
Reclassification (104,271) (77,698)
Changes in foreign currency exchange rates (3,280) 20,766
Other (4,705) (44,740)
Ending balance 441,204 389,112
Derivatives [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance (40,578) (62,359)
Cash flow (5,189) 95,572
Changes in foreign currency exchange rates (478) (4,792)
Changes in fair value 84,074 (68,999)
Ending balance ¥ 37,829 ¥ (40,578)