v3.26.1
Financial Instruments - Schedule of Derivative Financial Liabilities by Maturity (Details) - Measured at fair value through profit or loss - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount ¥ 23,709 ¥ 20,671
Bonds    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount 4,656,812 4,190,632
Financial liabilities, at fair value 6,448,659 5,635,859
Bonds | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 650,604 499,779
Bonds | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 263,936 570,054
Bonds | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 404,913 216,517
Bonds | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 1,121,772 355,414
Bonds | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 469,763 1,046,745
Bonds | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 3,537,671 2,947,350
Long-term loans    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount 225,026 324,633
Financial liabilities, at fair value 246,247 334,907
Long-term loans | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 3,505 161,958
Long-term loans | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 3,629 1,837
Long-term loans | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 78,885 1,903
Long-term loans | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 43,490 76,945
Long-term loans | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 2,010 41,495
Long-term loans | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 114,727 50,769
Trade and other payables    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount   475,541
Financial liabilities, at fair value 491,345 475,541
Trade and other payables | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 491,345 475,541
Trade and other payables | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Trade and other payables | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Trade and other payables | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Trade and other payables | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Trade and other payables | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Lease liabilities    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount 594,520 573,325
Financial liabilities, at fair value 847,049 825,819
Lease liabilities | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 65,443 64,443
Lease liabilities | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 62,679 57,426
Lease liabilities | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 58,269 54,117
Lease liabilities | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 55,393 50,974
Lease liabilities | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 51,561 49,114
Lease liabilities | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 553,705 549,744
Derivative liabilities    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount 20,524 16,528
Financial liabilities, at fair value 22,935 18,043
Derivative liabilities | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 9,188 7,766
Derivative liabilities | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 1,457 1,078
Derivative liabilities | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 1,474 1,047
Derivative liabilities | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 1,560 1,013
Derivative liabilities | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 1,715 1,081
Derivative liabilities | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value 7,541 6,057
Derivative assets    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Carrying amount (167,920) (84,369)
Financial liabilities, at fair value (311,149) (269,425)
Derivative assets | Within one year    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value (33,383) (35,404)
Derivative assets | Between one and two years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value (31,610) (29,400)
Derivative assets | Between two and three years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value (51,246) (29,428)
Derivative assets | Between three and four years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value (19,777) (30,556)
Derivative assets | Between four and five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value (49,702) (18,240)
Derivative assets | More than five years    
Disclosure of maturity analysis for financial liabilities [Line Items]    
Financial liabilities, at fair value ¥ (125,430) ¥ (126,397)