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Hedging Activities (Tables)
 6 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivatives
At September 30, 2025 and March 31, 2025, the notional amounts of the Company’s outstanding derivatives were as follows:
September 30, 2025March 31, 2025
(In millions)Currency
Maturity Date (1)
Notional
Derivatives designated as net investment hedges: (2)
Cross-currency swaps (3)
CADDec-26 to Mar-27C$6,500 C$6,500 
Derivatives designated as fair value hedges: (2)
Cross-currency swaps (4)
GBPNov-28£450 £450 
Cross-currency swaps (4)
EUR
Nov-25 to Jul-26
€1,100 €1,100 
Floating interest rate swaps (5)
USDAug-27 to Sep-29$750 $750 
Derivatives designated as cash flow hedges: (2)
Foreign currency forwardsGBP£— £11 
Interest rate swap locks
USD$— $850 
(1)The maturity date reflected is for outstanding derivatives as of September 30, 2025.
(2)There was no ineffectiveness in these hedges for the three and six months ended September 30, 2025 and 2024.
(3)The Company agreed with third parties to exchange fixed interest payments in one currency for fixed interest payments in another currency at specified intervals and to exchange principal in one currency for principal in another currency, calculated by reference to agreed-upon notional amounts.
(4)Represents cross-currency fixed-to-fixed interest rate swaps to mitigate the foreign currency exchange fluctuations on its foreign currency-denominated notes.
(5)Represents fixed-to-floating interest rate swaps to hedge the changes in fair value caused by fluctuations in the benchmark interest rates.
Schedule of Cash Flow Hedges Gains (Losses) From Derivatives Included in Other Comprehensive Income (Loss)
Gains (losses) from derivatives included in other comprehensive income (loss) in the Condensed Consolidated Statements of Comprehensive Income were as follows:
Three Months Ended September 30, Six Months Ended September 30,
(In millions)2025202420252024
Derivatives designated as net investment hedges:
Cross-currency swaps$98 $(20)$(135)$(13)
Derivatives designated as cash flow and other hedges:
Cross-currency swaps (1)
$(5)$(14)$— $(14)
Interest rate swap locks, Foreign currency forwards and Other(2)2 12 2 
(1)Includes other comprehensive income (loss) related to the excluded component of certain fair value hedges.
Schedule of Net Investment Hedges Gains (Losses) From Derivatives Included in Other Comprehensive Income (Loss)
Gains (losses) from derivatives included in other comprehensive income (loss) in the Condensed Consolidated Statements of Comprehensive Income were as follows:
Three Months Ended September 30, Six Months Ended September 30,
(In millions)2025202420252024
Derivatives designated as net investment hedges:
Cross-currency swaps$98 $(20)$(135)$(13)
Derivatives designated as cash flow and other hedges:
Cross-currency swaps (1)
$(5)$(14)$— $(14)
Interest rate swap locks, Foreign currency forwards and Other(2)2 12 2 
(1)Includes other comprehensive income (loss) related to the excluded component of certain fair value hedges.
Schedule of Fair Value of Derivatives
Information regarding the fair value of derivatives on a gross basis were as follows:
Balance Sheet
Caption		September 30, 2025March 31, 2025
Fair Value of
Derivative		U.S. Dollar NotionalFair Value of
Derivative		U.S. Dollar Notional
(In millions)AssetLiabilityAssetLiability
Derivatives designated for hedge accounting:
Cross-currency swaps (current)Prepaid expenses and other$90 $— $1,200 $54 $— $595 
Cross-currency swaps (non-current)Other non-current assets/liabilities50 154 5,049 66 18 5,550 
Interest rate swaps (non-current)Other non-current liabilities— 9 750 — 18 750 
Interest Rate Swap Locks (non-current)
Other non-current liabilities— — — — 6 850 
Foreign currency forwards (current)Prepaid expenses and other— — — 1 — 14 
Total$140 $163 $121 $42