Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	$ 362	$ 344
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Short-term investments, Fair Value	362	343
Corporate bonds
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	130	114
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Short-term investments, Fair Value	130	113
U.S. Treasury securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	95	80
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	95	80
U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	9	25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	9	25
Commercial paper
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	66	63
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	66	63
Foreign government securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	8	11
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	8	11
Asset-backed securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	41	37
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	41	37
Certificates of deposit
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	13	14
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 13	$ 14