v3.25.2
Segment Information - Summary of Operating Segments (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of operating segments [line items]      
Sales revenues ¥ 48,036,704 ¥ 45,095,325 ¥ 37,154,298
Operating expenses 43,241,118 39,742,390 34,429,273
Operating income 4,795,586 5,352,934 2,725,025
Total assets 93,601,350 90,114,296 74,303,180
Investments accounted for using the equity method 5,798,051 5,710,106 5,227,345
Depreciation and amortization 2,251,233 2,087,066 2,039,904
Capital expenditures 5,991,268 4,848,042 3,496,219
Automotive [Member]      
Disclosure of operating segments [line items]      
Sales revenues 43,199,865 41,266,204 33,820,000
Operating expenses 39,259,587 36,644,729 31,639,363
Operating income 3,940,278 4,621,475 2,180,637
Total assets 30,117,987 29,351,344 26,321,858
Investments accounted for using the equity method 5,201,784 5,114,364 4,717,231
Depreciation and amortization 1,378,107 1,268,479 1,205,687
Capital expenditures 2,193,872 2,011,361 1,688,114
Financial services [Member]      
Disclosure of operating segments [line items]      
Sales revenues 4,481,180 3,484,198 2,809,647
Operating expenses 3,797,661 2,914,175 2,372,131
Operating income 683,519 570,023 437,516
Total assets 46,770,786 43,834,183 35,525,441
Investments accounted for using the equity method 112,640 110,308 92,903
Depreciation and amortization 838,167 784,013 799,156
Capital expenditures 3,687,890 2,763,931 1,786,373
All other [Member]      
Disclosure of operating segments [line items]      
Sales revenues 1,447,114 1,368,164 1,224,943
Operating expenses 1,265,920 1,192,923 1,121,492
Operating income 181,194 175,241 103,451
Total assets 2,884,421 3,011,363 2,946,994
Investments accounted for using the equity method 309,121 282,888 272,752
Depreciation and amortization 34,958 34,574 35,062
Capital expenditures 100,941 103,242 38,748
Inter-segment Elimination/Unallocated Amount [Member]      
Disclosure of operating segments [line items]      
Sales revenues (1,091,455) (1,023,242) (700,293)
Operating expenses (1,082,050) (1,009,437) (703,713)
Operating income (9,405) (13,805) 3,420
Total assets 13,828,157 13,917,406 9,508,887
Investments accounted for using the equity method 174,505 202,546 144,460
Capital expenditures 8,565 (30,492) (17,015)
Revenues from external customers [Member]      
Disclosure of operating segments [line items]      
Sales revenues 48,036,704 45,095,325 37,154,298
Revenues from external customers [Member] | Automotive [Member]      
Disclosure of operating segments [line items]      
Sales revenues 42,996,299 41,080,731 33,776,870
Revenues from external customers [Member] | Financial services [Member]      
Disclosure of operating segments [line items]      
Sales revenues 4,437,827 3,447,195 2,786,679
Revenues from external customers [Member] | All other [Member]      
Disclosure of operating segments [line items]      
Sales revenues 602,578 567,399 590,749
Inter-segment revenues and transfers [Member] | Automotive [Member]      
Disclosure of operating segments [line items]      
Sales revenues 203,566 185,473 43,131
Inter-segment revenues and transfers [Member] | Financial services [Member]      
Disclosure of operating segments [line items]      
Sales revenues 43,353 37,003 22,968
Inter-segment revenues and transfers [Member] | All other [Member]      
Disclosure of operating segments [line items]      
Sales revenues 844,536 800,766 634,194
Inter-segment revenues and transfers [Member] | Inter-segment Elimination/Unallocated Amount [Member]      
Disclosure of operating segments [line items]      
Sales revenues ¥ (1,091,455) ¥ (1,023,242) ¥ (700,293)