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Hedging Activities - Schedule of Fair Value of Derivatives (Details) - Derivatives designated for hedge accounting - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Derivatives, Fair Value [Line Items]    
Total $ 140 $ 121
Total 163 42
Cross-currency swaps | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Asset 90 54
Liability 0 0
U.S. Dollar notional amount, asset 1,200 595
Cross-currency swaps | Other non-current assets/liabilities    
Derivatives, Fair Value [Line Items]    
Asset 50 66
Liability 154 18
U.S. Dollar notional amount, asset 5,049 5,550
Interest rate swaps (non-current) | Other non-current liabilities    
Derivatives, Fair Value [Line Items]    
Asset 0 0
Liability 9 18
U.S. Dollar, notional amount, liability 750 750
Interest Rate Swap Locks (non-current) | Other non-current liabilities    
Derivatives, Fair Value [Line Items]    
Asset 0 0
Liability 0 6
U.S. Dollar, notional amount, liability 0 850
Foreign currency forwards | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Asset 0 1
Liability 0 0
U.S. Dollar notional amount, asset $ 0 $ 14