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Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020
Financial Instruments |  |  |
Fair Value | $ 1,938 | $ 1,967 | [1]
Short-term investments |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 1,935 | 1,970 |
Gross Unrealized Gains | 3 | 5 |
Gross Unrealized Losses | 0 | (8) |
Fair Value | 1,938 | 1,967 |
Short-term investments | Corporate bonds |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 647 | 684 |
Gross Unrealized Gains | 1 | 1 |
Gross Unrealized Losses | 0 | (4) |
Fair Value | 648 | 681 |
Short-term investments | U.S. Treasury securities |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 559 | 530 |
Gross Unrealized Gains | 1 | 4 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 560 | 534 |
Short-term investments | U.S. agency securities |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 4 | 8 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 4 | 8 |
Short-term investments | Commercial paper |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 369 | 377 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 369 | 377 |
Short-term investments | Debt Security, Government, Non-US [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 72 | 42 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 72 | 42 |
Short-term investments | Asset-backed Securities [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 208 | 273 |
Gross Unrealized Gains | 1 | 0 |
Gross Unrealized Losses | 0 | (4) |
Fair Value | 209 | 269 |
Short-term investments | Certificates of Deposit [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 76 | 56 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | $ 76 | $ 56 |
[1] | Derived from audited Consolidated Financial Statements.

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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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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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