v3.25.2
Financial Instruments - Schedule of Carrying Value and Fair Value of Financial Instruments by Categories (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost $ 8,738 $ 7,449
Financial assets at fair value through profit or loss designated upon initial recognition 3  
Financial assets at fair value through profit or loss mandatory 326 395
Financial assets at fair value through OCI equity instruments designated upon initial recognition 27 25
Financial assets at fair value through OCI mandatory 2,228 2,331
Financial assets total carrying value 11,322 10,200
Financial assets total fair value 11,333 10,215
Financial liabilities amortised cost 3,381 3,363
Financial liabilities at fair value through profit or loss mandatory 83 76
Financial liabilities at fair value through OCI mandatory 4  
Financial liabilities total carrying value 3,468 3,439
Financial liabilities total fair value 3,468 3,439
Trade Payables    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities amortised cost 487 474
Financial liabilities total carrying value 487 474
Financial liabilities total fair value 487 474
Lease liabilities    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities amortised cost 962 1,002
Financial liabilities total carrying value 962 1,002
Financial liabilities total fair value 962 1,002
Derivative Financial Instruments    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities at fair value through profit or loss mandatory 3 4
Financial liabilities at fair value through OCI mandatory 4  
Financial liabilities total carrying value 7 4
Financial liabilities total fair value 7 4
Financial Liability Under Option Arrangements    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities at fair value through profit or loss mandatory 77 72
Financial liabilities total carrying value 77 72
Financial liabilities total fair value 77 72
Other Liabilities Including Contingent Consideration    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities amortised cost 1,932 1,887
Financial liabilities at fair value through profit or loss mandatory 3  
Financial liabilities total carrying value 1,935 1,887
Financial liabilities total fair value 1,935 1,887
Contingent Consideration    
Disclosure Of Financial Instruments [Line Items]    
Financial liabilities total fair value 3  
Cash and Cash Equivalents    
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost 2,861 1,773
Financial assets total carrying value 2,861 1,773
Financial assets total fair value 2,861 1,773
Liquid Mutual Funds    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 229 313
Liquid Mutual Funds | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through profit or loss mandatory 229 313
Financial assets total carrying value 229 313
Financial assets total fair value 229 313
Quoted Debt Securities    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 1,602 1,620
Quoted Debt Securities | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost 193 211
Financial assets at fair value through OCI mandatory 1,389 1,384
Financial assets total carrying value 1,582 1,595
Financial assets total fair value 1,602 [1] 1,620 [2]
Target Maturity Fund Units    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 54 51
Target Maturity Fund Units | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through profit or loss mandatory 54 51
Financial assets total carrying value 54 51
Financial assets total fair value 54 51
Certificates of Deposit    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 410 365
Certificates of Deposit | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through OCI mandatory 410 365
Financial assets total carrying value 410 365
Financial assets total fair value 410 365
Commercial Paper    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 426 579
Commercial Paper | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through OCI mandatory 426 579
Financial assets total carrying value 426 579
Financial assets total fair value 426 579
Quoted Equity Securities    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 7 14
Quoted Equity Securities | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through OCI equity instruments designated upon initial recognition 7 14
Financial assets total carrying value 7 14
Financial assets total fair value 7 14
Unquoted Equity and Preference Securities    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 23 11
Unquoted Equity and Preference Securities | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through profit or loss designated upon initial recognition 3  
Financial assets at fair value through OCI equity instruments designated upon initial recognition 20 11
Financial assets total carrying value 23 11
Financial assets total fair value 23 11
Unquoted Investments Others    
Disclosure Of Financial Instruments [Line Items]    
Financial assets total fair value 23 24
Unquoted Investments Others | Investments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through profit or loss mandatory 23 24
Financial assets total carrying value 23 24
Financial assets total fair value 23 24
Trade Receivables    
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost 3,645 3,620
Financial assets total carrying value 3,645 3,620
Financial assets total fair value 3,645 3,620
Unbilled Revenue    
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost 1,195 [3] 1,151 [4]
Financial assets total carrying value 1,195 [3] 1,151 [4]
Financial assets total fair value 1,195 [3] 1,151 [4]
Prepayments and Other Assets    
Disclosure Of Financial Instruments [Line Items]    
Financial assets amortised cost 844 694
Financial assets total carrying value 844 694
Financial assets total fair value 835 [5] 684 [6]
Derivative Financial Instruments    
Disclosure Of Financial Instruments [Line Items]    
Financial assets at fair value through profit or loss mandatory 20 7
Financial assets at fair value through OCI mandatory 3 3
Financial assets total carrying value 23 10
Financial assets total fair value $ 23 $ 10
[1] On account of fair value changes including interest accrued
[2] On account of fair value changes including interest accrued
[3] Excludes unbilled revenue on contracts where the right to consideration is dependent on completion of contractual milestones
[4] Excludes unbilled revenue on contracts where the right to consideration is dependent on completion of contractual milestones
[5] Excludes interest accrued on quoted debt securities carried at amortized cost of $9 million
[6] Excludes interest accrued on quoted debt securities carried at amortized cost of $10 million