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Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Financial Instruments    
Cost or Amortized Cost $ 112 $ 112
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 112 112 [1]
Corporate bonds    
Financial Instruments    
Cost or Amortized Cost 46 46
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 46 46
U.S. Treasury securities    
Financial Instruments    
Cost or Amortized Cost 21 12
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 21 12
Foreign government securities    
Financial Instruments    
Cost or Amortized Cost 7 4
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 7 4
Asset-backed securities    
Financial Instruments    
Cost or Amortized Cost 38 50
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 38 $ 50
[1] Derived from audited Consolidated Financial Statements.