Espp Exercise Price For Shares Issued

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- Definition

Maximum Percentage That Employees Authorized For Payroll Deductions

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Minimum Percentage That Employees Authorized For Payroll Deductions

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- Definition

Number of Shares Available for Grant, Employee Stock Purchase Plans

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- Definition

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

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- Definition

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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- Definition

Reduction In Shares Available Per Grant Of Stock Right

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Grants

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Outstanding

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- Definition

Stock Based Compensation Deferred Tax Write Off

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- Definition

Target percentage of presented shares granted that may potentially vest

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- Definition

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

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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No definition available.

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- Definition

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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No definition available.

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- Definition

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

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- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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- Definition

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

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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- Definition

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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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-Number 210

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- Definition

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

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Amount of stock repurchase plan authorized.

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(Stock-Based Compensation And Employee Benefit Plans Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax costs from exercise of stock options	$ 22	$ 13	$ 0
Common Stock, Shares, Outstanding	310,000,000us-gaap_CommonStockSharesOutstanding	311,000,000us-gaap_CommonStockSharesOutstanding
Number of Shares Available for Grant, Employee Stock Purchase Plans	6,100,000
Deferred Compensation Plan Assets	9us-gaap_DeferredCompensationPlanAssets	9us-gaap_DeferredCompensationPlanAssets
Deferred Compensation Liability, Classified, Noncurrent	9	9
Deferred Compensation Arrangement with Individual, Employer Contribution	27	16	19
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%
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%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	16
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months
Deferred Tax Expense from Stock Options Exercised			1
Stock Based Compensation Deferred Tax Write Off			1
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	19,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 12.01	$ 8.61	$ 4.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	22	16
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]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 8.26	$ 4.67	$ 4.83
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%
Stock Issued During Period, Shares, Employee Stock Purchase Plans	1,000,000
Employee Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP Exercise Price For Shares Issued	$ 22.64
Employee Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP Exercise Price For Shares Issued	$ 32.16
Restricted Stock Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction In Shares Available Per Grant Of Stock Right	1.43
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	222
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	13,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 37.22	$ 23.01	$ 12.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	209.0	163.0	102.0
Market Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 48.14	$ 30.18	$ 12.60
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	23.0	7.0	2.0
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Grants	400,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Target Maximum, Outstanding	1,300,000
Market Based Restricted Stock Units [Member] \| Target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of presented shares granted that may potentially vest	100.00%
Fiscal Year 2012 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount			500
Stock Repurchased and Retired During Period, Shares	0		22,000,000
Fiscal Year 2015 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount	750
Stock Repurchased and Retired During Period, Shares	8,300,000
Fiscal Year 2016 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount	$ 1,000