Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) Contingent Consideration		Mar. 31, 2013 Significant Unobservable Inputs (Level 3) Contingent Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance			$ 43		$ 112
Change in fair value			7	[1]	(64)	[1]
Payments	1	1	(3)	[2]	(5)	[2]
Ending Balance			$ 47		$ 43

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

[2] During the three months ended June 30, 2013, we made payments totaling $3 million to settle certain performance milestones achieved in connection with one of our acquisitions. During fiscal year 2013, we made payments totaling $5 million to settle certain performance milestones achieved in connection with two of our acquisitions.