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Fair Value Measurements (Fair Value of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets at fair value | $ 1,525 | $ 1,413
Total liabilities at fair value | 51 | 89
Short-term investments | 362 | 343
Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 130 | 113
U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 95 | 80
U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9 | 25
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 66 | 63
Foreign government securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 8 | 11
Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 41 | 37
Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 13 | 14
Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets at fair value | 1,221 | 1,115
Total liabilities at fair value | 31 | 24
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets at fair value | 304 | 298
Total liabilities at fair value | 20 | 65
Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets at fair value | 0 | 0
Total liabilities at fair value | 0 | 0
Cash equivalents | Bank and time deposits | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 58 | 56
Cash equivalents | Money market funds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 1,038 | 956
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank and time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 58 | 56
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 1,038 | 956
Cash equivalents | Significant Other Observable Inputs (Level 2) | Bank and time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 0 | 0
Cash equivalents | Significant Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 0 | 0
Cash equivalents | Fair Value, Inputs, Level 3 | Bank and time deposits |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 0 | 0
Cash equivalents | Fair Value, Inputs, Level 3 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, cash equivalents | 0 | 0
Short-term investments | Corporate bonds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 130 | 113
Short-term investments | U.S. Treasury securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 95 | 80
Short-term investments | U.S. agency securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9 |
Short-term investments | Foreign government securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 8 | 11
Short-term investments | Asset-backed securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Asset-backed securities | 41 | 37
Short-term investments | Certificates of deposit | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 13 | 14
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 95 | 80
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 |
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign government securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Asset-backed securities | 0 | 0
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 130 | 113
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9 |
Short-term investments | Significant Other Observable Inputs (Level 2) | Foreign government securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 8 | 11
Short-term investments | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Asset-backed securities | 41 | 37
Short-term investments | Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 13 | 14
Short-term investments | Fair Value, Inputs, Level 3 | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 |
Short-term investments | Fair Value, Inputs, Level 3 | Foreign government securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Asset-backed securities | 0 | 0
Short-term investments | Fair Value, Inputs, Level 3 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments and cash equivalents | U.S. agency securities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments |  | 28
Short-term investments and cash equivalents | Commercial paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 74 | 66
Short-term investments and cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments |  | 0
Short-term investments and cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Short-term investments and cash equivalents | Significant Other Observable Inputs (Level 2) | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments |  | 28
Short-term investments and cash equivalents | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 74 | 66
Short-term investments and cash equivalents | Fair Value, Inputs, Level 3 | U.S. agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments |  | 0
Short-term investments and cash equivalents | Fair Value, Inputs, Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Other current assets and other assets | Foreign currency derivatives | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives | 29 | 29
Other current assets and other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives | 0 | 0
Other current assets and other assets | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives | 29 | 29
Other current assets and other assets | Fair Value, Inputs, Level 3 | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives | 0 | 0
Other assets | Deferred compensation plan assets | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 30 | 23
Other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 30 | 23
Other assets | Significant Other Observable Inputs (Level 2) | Deferred compensation plan assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 0 | 0
Other assets | Fair Value, Inputs, Level 3 | Deferred compensation plan assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 0 | 0
Accrued and other current liabilities and other liabilities | Foreign currency derivatives | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities | 20 | 65
Accrued and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities |  | 0
Accrued and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities | 0 |
Accrued and other current liabilities and other liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities | 20 | 65
Accrued and other current liabilities and other liabilities | Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities |  | 0
Accrued and other current liabilities and other liabilities | Fair Value, Inputs, Level 3 | Foreign currency derivatives |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, foreign currency derivatives, liabilities | 0 |
Other liabilities | Deferred compensation plan liabilities | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 31 | 24
Other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 31 | 24
Other liabilities | Significant Other Observable Inputs (Level 2) | Deferred compensation plan liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | 0 | 0
Other liabilities | Fair Value, Inputs, Level 3 | Deferred compensation plan liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value, deferred compensation plan assets and liabilities | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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