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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, 2025	Mar. 31, 2024
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	$ 1,138	$ 1,525
Total liabilities at fair value	62	51
Short-term investments	112	362
Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	46	130
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	12	95
U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	9
Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	66
Foreign government securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	4	8
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	50	41
Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	13
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	1,010	1,221
Total liabilities at fair value	36	31
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value	128	304
Total liabilities at fair value	26	20
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	58
Cash equivalents | Money market funds | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value, cash equivalents	904	1,038
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	58
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	904	1,038
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	46	130
Short-term investments | U.S. Treasury securities | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	12	95
Short-term investments | Foreign government securities | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	4	8
Short-term investments | Asset-backed securities | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset-backed securities	50	41
Short-term investments | Certificates of deposit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		13
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	12	95
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
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	46	130
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) | Foreign government securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	4	8
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	50	41
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
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 | 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
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		9
Short-term investments and cash equivalents | Commercial paper | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		74
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
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		9
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
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
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	28	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	28	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	36	30
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	36	30
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
Accounts payable, 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	26	20
Accounts payable, 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
Accounts payable, 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
Accounts payable, 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	26	20
Accounts payable, 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
Accounts payable, 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	36	31
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	36	31
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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Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value of financial and nonfinancial obligations.

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Data Type:	na
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Period Type: