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Maximum Percentage That Employees Authorized For Payroll Deductions

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Minimum Percentage That Employees Authorized For Payroll Deductions

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Number of Shares Available for Grant, Employee Stock Purchase Plans

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Percentage Allowed Of Exercise Price Of Stock Options Compared To Fair Market Value On Date Of Grant

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Percentage range of shares received at vesting for stock units based on our total stockholder return ("TSR") relative to the performance of companies in the NASDAQ-100 Index for each measurement period.

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Share Based Compensation Arrangement Performance-based Milestone Percentage

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Discount rate from fair value on offering date that participants pay for shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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(Stock-Based Compensation And Employee Benefit Plans Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Income Tax Expense (Benefit)	$ (142)	$ (1,876)	$ (16)
Common Stock, Shares, Outstanding	286.0	288.0
Deferred Compensation Plan Assets	$ 18	$ 13
Deferred Compensation Liability, Classified, Noncurrent	19	14
Deferred Compensation Arrangement with Individual, Contributions by Employer	40	29	43
Stock Repurchased and Retired During Period, Value	$ 729	1,207	1,192
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	17.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 76	$ 22	$ 24
2019 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Allowed Of Exercise Price Of Stock Options Compared To Fair Market Value On Date Of Grant	100.00%
2019 Equity Plan \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	13.5
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant, Employee Stock Purchase Plans	4.9
Minimum Percentage That Employees Authorized For Payroll Deductions	2.00%
Maximum Percentage That Employees Authorized For Payroll Deductions	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	85.00%
Employee Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP Exercise Price For Shares Issued	$ 74.70	$ 74.70	$ 89.46
Employee Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP Exercise Price For Shares Issued	$ 119.37	$ 74.89	$ 107.51
Restricted Stock Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	12.4
Performance Based Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement	0.00%
Performance Based Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement	200.00%
Market Based Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement	0.00%
Market Based Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Range Of Shares Received At Vesting Based On Total Stock Return Measurement	200.00%
Stock-based compensation expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Income Tax Expense (Benefit)	$ 56	$ 43	$ 40
Free cash flow [Member] \| Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement Performance-based Milestone Percentage	50.00%