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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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- Definition

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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Percentage of vesting of share-based compensation awards.

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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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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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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, 2019	Mar. 31, 2018	Mar. 31, 2017	May 08, 2017	May 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Income Tax Expense (Benefit)	$ (16)	$ 203	$ 103
Common Stock, Shares, Outstanding	298.0	306.0
Deferred Compensation Plan Assets	$ 11	$ 10
Deferred Compensation Liability, Classified, Noncurrent	12	11
Deferred Compensation Arrangement with Individual, Contributions by Employer	43	31	28
Stock Repurchased and Retired During Period, Value	$ (1,192)	601	508
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	15.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 24	$ 43	$ 39
Equity Plan [Member]
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%
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant, Employee Stock Purchase Plans	6.3
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	$ 89.46	$ 67.56	$ 54.60
Employee Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP Exercise Price For Shares Issued	$ 107.51	$ 99.82	$ 67.56
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	11.0
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	67.00%
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%
May 2015 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount					$ 1,000
Stock Repurchased and Retired During Period, Value	$ 0	$ 31	$ 508
Stock Repurchased and Retired During Period, Shares	0.0	0.3	6.5
May 2017 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount				$ 1,200
Stock Repurchased and Retired During Period, Value	$ 76	$ 570
Stock Repurchased and Retired During Period, Shares	0.6	5.0
Stock-based compensation expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Income Tax Expense (Benefit)	$ 40	$ 29	$ 43
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%