v3.26.1
Financial Instruments - Schedule of Analysis of Foreign Currency Risk From Monetary Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure Of Financial Instruments [Line Items]    
Net financial assets $ 10,357 $ 11,322
Net financial liabilities (3,570) (3,468)
Foreign Currency Risk    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 5,345 5,298
Net financial liabilities (2,592) (2,435)
Total 2,753 2,863
Foreign Currency Risk | U.S. Dollars    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 3,025 3,138
Net financial liabilities (1,551) (1,539)
Total 1,474 1,599
Foreign Currency Risk | Euro    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 1,384 1,379
Net financial liabilities (482) (440)
Total 902 939
Foreign Currency Risk | United Kingdom Pound Sterling    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 259 261
Net financial liabilities (142) (120)
Total 117 141
Foreign Currency Risk | Australian Dollars    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 235 159
Net financial liabilities (131) (83)
Total 104 76
Foreign Currency Risk | Other Currencies    
Disclosure Of Financial Instruments [Line Items]    
Net financial assets 442 361
Net financial liabilities (286) (253)
Total $ 156 $ 108