Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs (Level 3)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments	$ (28)		$ (25)		$ 0
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning Balance	112		51
Additions			100
Change in fair value	(64)	[1]	11	[1]
Payments	(5)	[2]	(25)	[2]
Reclassification			(25)	[3]
Ending Balance	$ 43		$ 112

[1] The change in fair value is reported as acquisition-related contingent consideration in our Consolidated Statements of Operations.

[2] During the fiscal year 2013, we made payments totaling $5 million to settle certain performance milestones achieved in connection with two of our acquisitions. During the fourth quarter of fiscal year 2012, we made a payment of $25 million to settle certain performance milestones achieved through December 31, 2011 in connection with our acquisition of Playfish Limited (“Playfish”).

[3] During the fourth quarter of fiscal year 2012, we reclassified $25 million of contingent consideration in connection with our acquisition of Playfish to other current liabilities in our Consolidated Balance Sheet as the contingency was settled. This amount was paid during the second quarter of fiscal 2013.