v3.26.1
Investments - Schedule of Carrying Value of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current $ 1,365 $ 1,460
Carrying value of investments, Non-Current 942 1,294
Total Investments 2,307 2,754
Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 57 193
Fair Value Through Profit or Loss    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 285 309
Fair Value Through Other Comprehensive Income    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 1,965 2,252
Cost | Quoted Debt Securities | Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Carrying value of investments, Current 11 20
Carrying value of investments, Non-Current 46 173
Fair Value    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 2,309 2,774
Fair Value | Quoted Debt Securities | Amortized Cost    
Disclosure Of Investments Other Than Investments Accounted For Using Equity Method [Line Items]    
Total Investments 59 213
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 132 375
Carrying value of investments, Non-Current 790 1,014
Total Investments 922 1,389
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 251 229
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 127 426
Total Investments 127 426
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 844 410
Total Investments 844 410
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 6 7
Total Investments 6 7
Fair Value | Unquoted Equity and Preference Securities | 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 6 3
Total Investments 6 3
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 66 20
Total Investments 66 20
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 0 54
Total Investments 0 54
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 28 23
Total Investments $ 28 $ 23