Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Assets And Liabilities Measured On Recurring Basis

			Fair Value Measurements at Reporting Date Using
	As of March 31, 2016		Quoted Prices in Active Markets for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs
			(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Bank and time deposits	$	345	$	345	$	—	$	—	Cash equivalents
Money market funds	143		143		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	745		—		745		—		Short-term investments and cash equivalents
U.S. Treasury securities	407		407		—		—		Short-term investments and cash equivalents
U.S. agency securities	170		—		170		—		Short-term investments and cash equivalents
Commercial paper	81		—		81		—		Short-term investments and cash equivalents
Foreign currency derivatives	16		—		16		—		Other current assets and other assets
Deferred compensation plan assets (a)	8		8		—		—		Other assets
Total assets at fair value	$	1,915	$	903	$	1,012	$	—
Liabilities
Foreign currency derivatives	10		—		10		—		Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	9		9		—		—		Other liabilities
Total liabilities at fair value	$	19	$	9	$	10	$	—

			Fair Value Measurements at Reporting Date Using
	As of March 31, 2015		Quoted Prices in Active Markets for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs
			(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Bank and time deposits	$	175	$	175	$	—	$	—	Cash equivalents
Money market funds	7		7		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	468		—		468		—		Short-term investments and cash equivalents
U.S. Treasury securities	214		214		—		—		Short-term investments
U.S. agency securities	180		—		180		—		Short-term investments and cash equivalents
Commercial paper	140		—		140		—		Short-term investments and cash equivalents
Foreign currency derivatives	18		—		18		—		Other current assets
Deferred compensation plan assets (a)	9		9		—		—		Other assets
Total assets at fair value	$	1,211	$	405	$	806	$	—
Liabilities
Foreign currency derivatives	9		—		9		—		Accrued and other current liabilities
Deferred compensation plan liabilities (a)	9		9		—		—		Other liabilities
Total liabilities at fair value	$	18	$	9	$	9	$	—