v3.26.1
Income Taxes - Components by Major Factor in Deferred Tax Assets and Deferred Tax Liabilities (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets ¥ 301,011 ¥ 143,499
Deferred tax liabilities 677,391 718,084
Gross carrying amount [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 1,255,422 838,231
Deferred tax liabilities 1,631,802 1,412,816
Net deferred tax assets (liabilities) (376,380) (574,585)
Gross carrying amount [member] | Inventories [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 100,609 62,292
Gross carrying amount [member] | Accrued expenses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 88,280 64,632
Gross carrying amount [member] | Provisions [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 349,210 243,174
Gross carrying amount [member] | Property, plant and equipment [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 29,954 55,231
Deferred tax liabilities 166,998 151,402
Gross carrying amount [member] | Intangible assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 24,796 91,540
Deferred tax liabilities 145,488 236,577
Gross carrying amount [member] | Retirement benefit liabilities [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 65,601 60,634
Gross carrying amount [member] | Lease liabilities [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 83,511 82,117
Gross carrying amount [member] | Carryforward of unused tax losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 289,535 36,057
Gross carrying amount [member] | Carryforward of unused tax credit [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 31,182 4,932
Gross carrying amount [member] | Other [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 192,744 137,622
Gross carrying amount [member] | Other financial assets [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 109,506 62,934
Gross carrying amount [member] | Operating leases [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 969,049 721,248
Gross carrying amount [member] | Undistributed earnings [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 64,126 71,781
Gross carrying amount [member] | Retirement benefit assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 40,709 44,309
Gross carrying amount [member] | Receivables from financial services [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities 32,874 34,337
Gross carrying amount [member] | Other [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities ¥ 103,052 ¥ 90,228