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(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Financial Instruments [Line Items] |  |
Short-term investments, Fair Value | $ 1,967 | $ 737
Short-Term Investments [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 1,970 | 738
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | (8) | (1)
Short-term investments, Fair Value | 1,967 | 737
Short-Term Investments [Member] | Corporate Bonds [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 684 | 325
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (4) | (1)
Short-term investments, Fair Value | 681 | 324
Short-Term Investments [Member] | U.S. Treasury Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 530 | 153
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 534 | 153
Short-Term Investments [Member] | U.S. Agency Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 8 | 44
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 8 | 44
Short-Term Investments [Member] | Commercial Paper [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 377 | 112
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 377 | 112
Short-Term Investments [Member] | Debt Security, Government, Non-US [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 42 | 50
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | 42 | 50
Short-Term Investments [Member] | Asset-backed Securities [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 273 | 53
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | 0
Short-term investments, Fair Value | 269 | 53
Short-Term Investments [Member] | Certificates of Deposit [Member] |  |
Financial Instruments [Line Items] |  |
Short-term investments, Amortized Cost | 56 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | $ 56 | $ 1

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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