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(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Financial Instruments [Line Items] |  |
Short-term investments, Fair Value | $ 343 | $ 330
Short-Term Investments [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 344 | 332
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (2)
Short-term investments, Fair Value | 343 | 330
Short-Term Investments [Member] | Corporate bonds |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 114 | 117
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (1)
Short-term investments, Fair Value | 113 | 116
Short-Term Investments [Member] | U.S. Treasury securities |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 80 | 103
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (1)
Short-term investments, Fair Value | 80 | 102
Short-Term Investments [Member] | U.S. Agency Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 25 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 25 | 0
Short-Term Investments [Member] | Commercial paper |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 63 | 39
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 63 | 39
Short-Term Investments [Member] | Foreign government securities |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 11 | 17
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 11 | 17
Short-Term Investments [Member] | Asset-backed securities |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 37 | 38
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 37 | 38
Short-Term Investments [Member] | Certificates of deposit |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 14 | 18
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | $ 14 | $ 18

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