Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Assets And Liabilities Measured On Recurring Basis

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets  for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs
	As of March 31, 2014		(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Money market funds	$	588	$	588	$	—	$	—	Cash equivalents
Available-for-sale securities:
Corporate bonds	279		—		279		—		Short-term investments
Commercial paper	146		—		146		—		Short-term investments and cash equivalents
U.S. Treasury securities	118		118		—		—		Short-term investments and cash equivalents
U.S. agency securities	89		—		89		—		Short-term investments and cash equivalents
Deferred compensation plan assets (a)	9		9		—		—		Other assets
Total assets at fair value	$	1,229	$	715	$	514	$	—
Liabilities
Contingent consideration (b)	$	4	$	—	$	—	$	4	Accrued and other current  liabilities and other liabilities
Foreign currency derivatives	6		—		6		—		Accrued and other current liabilities
Deferred compensation plan liabilities	9		9		—		—		Other liabilities
Total liabilities at fair value	$	19	$	9	$	6	$	4

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets  for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs
	As of September 30, 2014		(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Money market funds	$	6	$	6	$	—	$	—	Cash equivalents
Available-for-sale securities:
Corporate bonds	389		—		389		—		Short-term investments
U.S. Treasury securities	165		165		—		—		Short-term investments
U.S. agency securities	146		—		146		—		Short-term investments and cash equivalents
Commercial paper	99		—		99		—		Short-term investments and cash equivalents
Foreign currency derivatives	12		—		12		—		Other current assets
Deferred compensation plan assets (a)	10		10		—		—		Other assets
Total assets at fair value	$	827	$	181	$	646	$	—
Liabilities
Foreign currency derivatives	$	6	$	—	$	6	$	—	Accrued and other current liabilities
Deferred compensation plan liabilities	10		10		—		—		Other liabilities
Total liabilities at fair value	$	16	$	10	$	6	$	—

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Contingent Consideration
Balance as of March 31, 2013		$	43
Change in fair value (c)		(35		)
Payment (d)		(4		)
Balance as of March 31, 2014 (b)		$	4

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Contingent Consideration
Balance as of March 31, 2014		$	4
Change in fair value(c)		(2		)
Payments(d)		(2		)
Balance as of September 30, 2014 (b)		$	—