Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions		Sep. 30, 2018	Mar. 31, 2018
Loss Contingencies [Line Items]
Liability for Uncertainty in Income Taxes, Noncurrent		$ 248
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		140
Unrecorded Unconditional Purchase Obligation Payable in Common Stock Per Year | Maximum
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation		10
Unrecorded Unconditional Purchase Obligation Payable in Common Stock | Maximum
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation		30
Contingent consideration | Fair Value, Inputs, Level 3 [Member] | Other liabilities
Loss Contingencies [Line Items]
Accrued Liabilities, Fair Value Disclosure	[1]	$ 124	$ 122

[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 September 30, 2018, the discount rates used ranged from 3.3 percent to 3.7 percent. At March 31, 2018, the discount rates used ranged from 3.3 percent to 3.6 percent. See Note 6 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2018, for additional information regarding the Respawn acquisition.