Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2017

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 September 30, 2017		(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Bank and time deposits	$	304	$	304	$	—	$	—	Cash equivalents
Money market funds	93		93		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	1,247		—		1,247		—		Short-term investments and cash equivalents
U.S. Treasury securities	453		453		—		—		Short-term investments and cash equivalents
U.S. agency securities	133		—		133		—		Short-term investments and cash equivalents
Commercial paper	320		—		320		—		Short-term investments and cash equivalents
Foreign government securities	101		—		101		—		Short-term investments
Asset-backed securities	119		—		119		—		Short-term investments
Certificates of deposit	26		—		26		—		Short-term investments
Foreign currency derivatives	9		—		9		—		Other current assets and other assets
Deferred compensation plan assets (a)	10		10		—		—		Other assets
Total assets at fair value	$	2,815	$	860	$	1,955	$	—
Liabilities
Foreign currency derivatives	48		—		48		—		Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	10		10		—		—		Other liabilities
Total liabilities at fair value	$	58	$	10	$	48	$	—

			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, 2017		(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	$	—