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Investments - Schedule of Carrying Value of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current $ 1,548 $ 841
Carrying value of investments, Non-Current 1,404 1,530
Total Investments 2,952 2,371
Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 211 233
Fair Value Through Profit or Loss    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 388 189
Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 2,353 1,949
Cost | Quoted Debt Securities | Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current   18
Carrying value of investments, Non-Current 211 215
Fair Value    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 2,977 2,399
Fair Value | Quoted Debt Securities | Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 236 261
Fair Value | Quoted Debt Securities | Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current 291 179
Carrying value of investments, Non-Current 1,093 1,221
Total Investments 1,384 1,400
Fair Value | Liquid Mutual Funds | Fair Value Through Profit or Loss    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current 313 119
Total Investments 313 119
Fair Value | Commercial Paper | Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current 579 90
Total Investments 579 90
Fair Value | Certificates of Deposit | Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current 365 435
Total Investments 365 435
Fair Value | Quoted Equity Secutities | Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Non-Current 14  
Total Investments 14  
Fair Value | Unquoted Equity and Preference Securities | Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Non-Current 11 24
Total Investments 11 24
Fair Value | Target Maturity Fund Units | Fair Value Through Profit or Loss    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Non-Current 51 49
Total Investments 51 49
Fair Value | Others | Fair Value Through Profit or Loss    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Non-Current 24 21
Total Investments $ 24 $ 21