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(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | ---
Financial Instruments [Line Items] |  |
Short-term investments, Fair Value | $ 330 | $ 1,106
Short-Term Investments [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 332 | 1,105
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | 0
Short-term investments, Fair Value | 330 | 1,106
Short-Term Investments [Member] | Corporate Bonds [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 117 | 372
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Short-term investments, Fair Value | 116 | 372
Short-Term Investments [Member] | U.S. Treasury Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 103 | 374
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (1) | 0
Short-term investments, Fair Value | 102 | 375
Short-Term Investments [Member] | U.S. Agency Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 0 | 3
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 0 | 3
Short-Term Investments [Member] | Commercial Paper [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 39 | 136
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 39 | 136
Short-Term Investments [Member] | Debt Security, Government, Non-US [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 17 | 67
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 17 | 67
Short-Term Investments [Member] | Asset-backed Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 38 | 112
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 38 | 112
Short-Term Investments [Member] | Certificates of Deposit [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 18 | 41
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | $ 18 | $ 41

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