Business Combinations (Narrative) (Details) $ in Millions			12 Months Ended
	May 03, 2018 USD ($)	Dec. 01, 2017 USD ($)	Mar. 31, 2019 USD ($)	May 22, 2019 USD ($)	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired that were immaterial			1
Contingent consideration expense			$ 14
GameFly, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	May 03, 2018
Payments to Acquire Businesses, Gross	$ 50
Business Acquisition, Goodwill, Expected Tax Deductible Amount	7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	43
Stock Granted, Value, Share-based Compensation, Gross	$ 4
Respawn Entertainment, LLC [Member]
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	35	$ 105
Stock Granted, Value, Share-based Compensation, Gross		$ 167
Contingent consideration expense			14
Contingent Consideration [Member] | Respawn Entertainment, LLC [Member]
Business Acquisition [Line Items]
Fair value, Contingent consideration			136		$ 0
Other Liabilities [Member] | Contingent Consideration [Member] | Fair Value, Inputs, Level 3 [Member]
Business Acquisition [Line Items]
Fair value, Contingent consideration			$ 136		$ 122	[1]

[1] The contingent consideration represents the estimated fair value of the additional variable cash consideration payable in connection with our acquisition of Respawn Entertainment, LLC (“Respawn”) that is contingent upon the achievement of certain performance milestones. We estimated fair value using a probability-weighted income approach combined with a real options methodology, and applied a discount rate that appropriately captures the risk associated with the obligation. At March 31, 2019, the discount rates used ranged from 2.9 percent to 3.1 percent. See Note 7 for additional information regarding the Respawn acquisition. At March 31, 2018, the discount rates used ranged from 3.3 percent to 3.6 percent.