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Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Financial assets    
Short-term investments $ 830 $ 850
Financial liabilities    
Foreign currency forward contracts 9 10
Total financial liabilities 9 10
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Financial assets    
Money market funds 2,487 2,456
Short-term investments 830 850
Equity investments 342 153
Available-for-sale debt securities 18 13
Total financial assets 3,677 3,472
Level 1    
Financial assets    
Money market funds 2,487 2,456
Short-term investments 830 850
Equity investments 290 96
Available-for-sale debt securities 0 0
Total financial assets 3,607 3,402
Financial liabilities    
Foreign currency forward contracts 0 0
Total financial liabilities 0 0
Level 2    
Financial assets    
Money market funds 0 0
Short-term investments 0 0
Equity investments 0 0
Available-for-sale debt securities 0 0
Total financial assets 0 0
Financial liabilities    
Foreign currency forward contracts 9 10
Total financial liabilities 9 10
Level 3    
Financial assets    
Money market funds 0 0
Short-term investments 0 0
Equity investments 52 57
Available-for-sale debt securities 18 13
Total financial assets 70 70
Financial liabilities    
Foreign currency forward contracts 0 0
Total financial liabilities $ 0 $ 0