Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2017

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	623		—		623		—		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 government securities	122		—		122		—		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, 2017		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	$	233	$	233	$	—	$	—	Cash equivalents
Money market funds	405		405		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	963		—		963		—		Short-term investments and cash equivalents
U.S. Treasury securities	460		460		—		—		Short-term investments and cash equivalents
U.S. agency securities	172		—		172		—		Short-term investments and cash equivalents
Commercial paper	270		—		270		—		Short-term investments and cash equivalents
Foreign government securities	113		—		113		—		Short-term investments
Asset-backed securities	135		—		135		—		Short-term investments
Foreign currency derivatives	19		—		19		—		Other current assets and other assets
Deferred compensation plan assets (a)	8		8		—		—		Other assets
Total assets at fair value	$	2,778	$	1,106	$	1,672	$	—
Liabilities
Foreign currency derivatives	8		—		8		—		Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	9		9		—		—		Other liabilities
Total liabilities at fair value	$	17	$	9	$	8	$	—