Business Combinations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Dec. 01, 2017
Business Combination, Consideration Transferred		$ 273
Payments to Acquire Businesses, Gross		151
Business Combination, Contingent Consideration, Liability		122
Business Acquisition, Goodwill, Expected Tax Deductible Amount		171
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		74
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		28
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		140
Respawn Entertainment, LLC [Member]
Business Acquisition [Line Items]
Stock Granted, Value, Share-based Compensation, Gross		$ 167
Subsequent Event [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 50
Subsequent Event [Member] \| Gamefly [Member]
Business Acquisition [Line Items]
Stock Granted, Value, Share-based Compensation, Gross	$ 4

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 25
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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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