v3.25.2
Goodwill and intangible assets - Summary of Other Changes In Other Intangible Assets (Detail) - Other intangible assets [member] - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance ¥ 615,602 ¥ 563,842
Changes in carrying amount:    
Additions 180,008 160,427
Acquisitions through business combinations 41,788 4,397
Internal development 23,128 20,096
Disposals or classified as held for sale (4,717) (8,182)
Amortization (166,047) (153,890)
Impairment losses (10,350) (595)
Translation adjustment (3,586) 27,283
Other (4,614) 2,224
Total changes 55,610 51,760
Ending Balance 671,212 615,602
Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 19,918 19,022
Changes in carrying amount:    
Additions 4,121 8,854
Acquisitions through business combinations 8,433 371
Disposals or classified as held for sale (8) (16)
Amortization (6,734) (8,838)
Impairment losses (10) (16)
Translation adjustment (406) 444
Other 56 97
Total changes 5,452 896
Ending Balance 25,370 19,918
Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 14,933 22,321
Changes in carrying amount:    
Additions 230  
Acquisitions through business combinations 4,338 2,003
Disposals or classified as held for sale (414) (1,697)
Amortization (6,485) (10,166)
Impairment losses   0
Translation adjustment (74) 2,472
Other   0
Total changes (2,405) (7,388)
Ending Balance 12,528 14,933
Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 39,620 39,213
Changes in carrying amount:    
Additions 825 20
Acquisitions through business combinations 6,288 1,887
Disposals or classified as held for sale (1) (616)
Amortization (5,547) (5,874)
Translation adjustment (478) 5,094
Other 23 (104)
Total changes 1,110 407
Ending Balance 40,730 39,620
Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 409,990 347,072
Changes in carrying amount:    
Additions 169,476 145,515
Acquisitions through business combinations 4,698 13
Internal development 23,128 20,096
Disposals or classified as held for sale (3,897) (5,576)
Amortization (127,401) (110,296)
Impairment losses (10,337) (8)
Translation adjustment (1,567) 10,981
Other (6,372) 2,193
Total changes 47,728 62,918
Ending Balance 457,718 409,990
Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 25,447 26,280
Changes in carrying amount:    
Disposals or classified as held for sale   (33)
Amortization (4,324) (4,129)
Translation adjustment (358) 3,329
Other 26  
Total changes (4,656) (833)
Ending Balance 20,791 25,447
Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 105,694 109,934
Changes in carrying amount:    
Additions 5,356 6,038
Acquisitions through business combinations 18,031 123
Disposals or classified as held for sale (397) (244)
Amortization (15,556) (14,587)
Impairment losses (3) (571)
Translation adjustment (703) 4,963
Other 1,653 38
Total changes 8,381 (4,240)
Ending Balance 114,075 105,694
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 1,825,767 1,631,220
Changes in carrying amount:    
Ending Balance 2,017,703 1,825,767
Gross carrying amount [member] | Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 212,000 201,243
Changes in carrying amount:    
Ending Balance 216,960 212,000
Gross carrying amount [member] | Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 70,560 66,593
Changes in carrying amount:    
Ending Balance 73,654 70,560
Gross carrying amount [member] | Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 59,377 51,747
Changes in carrying amount:    
Ending Balance 65,643 59,377
Gross carrying amount [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 1,196,266 1,045,743
Changes in carrying amount:    
Ending Balance 1,353,946 1,196,266
Gross carrying amount [member] | Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 75,716 66,583
Changes in carrying amount:    
Ending Balance 73,958 75,716
Gross carrying amount [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance 211,848 199,311
Changes in carrying amount:    
Ending Balance 233,542 211,848
Accumulated depreciation and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (1,210,165) (1,067,378)
Changes in carrying amount:    
Ending Balance (1,346,491) (1,210,165)
Accumulated depreciation and impairment losses [member] | Patent rights, know-how and license agreements [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (192,082) (182,221)
Changes in carrying amount:    
Ending Balance (191,590) (192,082)
Accumulated depreciation and impairment losses [member] | Customer relationships [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (55,627) (44,272)
Changes in carrying amount:    
Ending Balance (61,126) (55,627)
Accumulated depreciation and impairment losses [member] | Trademarks [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (19,757) (12,534)
Changes in carrying amount:    
Ending Balance (24,913) (19,757)
Accumulated depreciation and impairment losses [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (786,276) (698,671)
Changes in carrying amount:    
Ending Balance (896,228) (786,276)
Accumulated depreciation and impairment losses [member] | Television carriage contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (50,269) (40,303)
Changes in carrying amount:    
Ending Balance (53,167) (50,269)
Accumulated depreciation and impairment losses [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning Balance (106,154) (89,377)
Changes in carrying amount:    
Ending Balance ¥ (119,467) ¥ (106,154)