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Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Mar. 31, 2024
Financial Instruments    
Cost or Amortized Cost $ 379 $ 362
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 379 362 [1]
Corporate bonds    
Financial Instruments    
Cost or Amortized Cost 135 130
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 135 130
U.S. Treasury securities    
Financial Instruments    
Cost or Amortized Cost 99 95
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 99 95
U.S. agency securities    
Financial Instruments    
Cost or Amortized Cost 3 9
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 3 9
Commercial paper    
Financial Instruments    
Cost or Amortized Cost 73 66
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 73 66
Foreign government securities    
Financial Instruments    
Cost or Amortized Cost 8 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 8 8
Asset-backed securities    
Financial Instruments    
Cost or Amortized Cost 46 41
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 46 41
Certificates of deposit    
Financial Instruments    
Cost or Amortized Cost 15 13
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 15 $ 13
[1] Derived from audited Consolidated Financial Statements.