v3.25.2
Financial Instruments - Schedule of Fair Value Measurement of Assets and Liabilities (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets ¥ 14,248,344 ¥ 15,108,792
Liabilities 7,312,365 7,834,788
Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 413,592 413,709
Liabilities 20,890 34,677
Fair value | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 16,309 13,783
Fair value | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 219 11,325
Fair value | Financial liabilities associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 4,362 7,772
Fair value | Other | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities   1,797
Fair value | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 12,361 17,617
Fair value | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 72,007 102,606
Fair value | Investments in convertible notes | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 10,424 13,459
Fair value | Investments in debt instruments | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 12,005 1,113
Fair value | Investments in debt instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 79,342  
Fair value | Financial assets associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 10,197 12,293
Fair value | Trade and other receivables | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 65,568 83,734
Fair value | Equity instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 151,687 182,887
Fair value | Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 157,415 93,962
Liabilities 0 0
Fair value | Level 1 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 0 0
Fair value | Level 1 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 0 0
Fair value | Level 1 | Financial liabilities associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 0 0
Fair value | Level 1 | Other | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities   0
Fair value | Level 1 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Investments in convertible notes | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Investments in debt instruments | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Investments in debt instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 79,342  
Fair value | Level 1 | Financial assets associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Trade and other receivables | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 1 | Equity instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 78,073 93,962
Fair value | Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 140,467 194,851
Liabilities 6,694 16,002
Fair value | Level 2 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 6,475 4,677
Fair value | Level 2 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 219 11,325
Fair value | Level 2 | Financial liabilities associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 0 0
Fair value | Level 2 | Other | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities   0
Fair value | Level 2 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 2,892 8,511
Fair value | Level 2 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 72,007 102,606
Fair value | Level 2 | Investments in convertible notes | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 2 | Investments in debt instruments | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 2 | Investments in debt instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0  
Fair value | Level 2 | Financial assets associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 2 | Trade and other receivables | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 65,568 83,734
Fair value | Level 2 | Equity instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 115,709 124,896
Liabilities 14,196 18,675
Fair value | Level 3 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 9,834 9,106
Fair value | Level 3 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 0 0
Fair value | Level 3 | Financial liabilities associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities 4,362 7,772
Fair value | Level 3 | Other | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Liabilities   1,797
Fair value | Level 3 | Derivatives | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 9,470 9,106
Fair value | Level 3 | Derivatives | Derivative hedging instruments | Derivative hedging instruments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 3 | Investments in convertible notes | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 10,424 13,459
Fair value | Level 3 | Investments in debt instruments | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 12,005 1,113
Fair value | Level 3 | Investments in debt instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0  
Fair value | Level 3 | Financial assets associated with contingent consideration arrangements | Measured at fair value through profit or loss    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 10,197 12,293
Fair value | Level 3 | Trade and other receivables | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets 0 0
Fair value | Level 3 | Equity instruments | Measured at fair value through other comprehensive income    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Assets ¥ 73,614 ¥ 88,925