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Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Mar. 31, 2024
Financial Instruments    
Cost or Amortized Cost $ 365 $ 362
Gross Unrealized Gains 1 0
Gross Unrealized Losses 0 0
Fair Value 366 362 [1]
Corporate bonds    
Financial Instruments    
Cost or Amortized Cost 139 130
Gross Unrealized Gains 1 0
Gross Unrealized Losses 0 0
Fair Value 140 130
U.S. Treasury securities    
Financial Instruments    
Cost or Amortized Cost 84 95
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 84 95
U.S. agency securities    
Financial Instruments    
Cost or Amortized Cost 4 9
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 9
Commercial paper    
Financial Instruments    
Cost or Amortized Cost 71 66
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 71 66
Foreign government securities    
Financial Instruments    
Cost or Amortized Cost 5 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 5 8
Asset-backed securities    
Financial Instruments    
Cost or Amortized Cost 43 41
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 43 41
Certificates of deposit    
Financial Instruments    
Cost or Amortized Cost 19 13
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 19 $ 13
[1] Derived from audited Consolidated Financial Statements.