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Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021
Financial Instruments |  |  |
Fair Value | $ 881 | $ 1,106 | [1]
Short-term investments |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 880 | 1,105 |
Gross Unrealized Gains | 1 | 1 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 881 | 1,106 |
Short-term investments | Corporate bonds |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 335 | 372 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 335 | 372 |
Short-term investments | U.S. Treasury securities |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 199 | 374 |
Gross Unrealized Gains | 1 | 1 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 200 | 375 |
Short-term investments | U.S. agency securities |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 3 | 3 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 3 | 3 |
Short-term investments | Commercial paper |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 126 | 136 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 126 | 136 |
Short-term investments | Debt Security, Government, Non-US [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 63 | 67 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 63 | 67 |
Short-term investments | Asset-backed Securities [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 117 | 112 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 117 | 112 |
Short-term investments | Certificates of Deposit [Member] |  |  |
Financial Instruments |  |  |
Cost or Amortized Cost | 37 | 41 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | $ 37 | $ 41 |
[1] | Derived from audited Consolidated Financial Statements.

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- Definition Financial Instruments [Line Items] + References No definition available. + Details
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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 investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + 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=123581744&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=123581744&loc=d3e27161-111563 + Details
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