Fair Value Measurements (Tables)

9 Months Ended

Dec. 31, 2017

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

			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 December 31, 2017		(Level 1)		(Level 2)		(Level 3)		Balance Sheet Classification
Assets
Bank and time deposits	$	299	$	299	$	—	$	—	Cash equivalents
Money market funds	563		563		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	1,258		—		1,258		—		Short-term investments and cash equivalents
U.S. Treasury securities	446		446		—		—		Short-term investments
U.S. agency securities	118		—		118		—		Short-term investments and cash equivalents
Commercial paper	341		—		341		—		Short-term investments and cash equivalents
Foreign government securities	100		—		100		—		Short-term investments and cash equivalents
Asset-backed securities	134		—		134		—		Short-term investments
Certificates of deposit	22		—		22		—		Short-term investments
Foreign currency derivatives	8		—		8		—		Other current assets and other assets
Deferred compensation plan assets (a)	10		10		—		—		Other assets
Total assets at fair value	$	3,299	$	1,318	$	1,981	$	—
Liabilities
Contingent consideration (b)	$	122	$	—	$	—	$	122	Other liabilities
Foreign currency derivatives	41		—		41		—		Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	11		11		—		—		Other liabilities
Total liabilities at fair value	$	174	$	11	$	41	$	122

			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	$	—

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Contingent Consideration
Balance as of March 31, 2017		$	—
Additions		122
Balance as of December 31, 2017		$	122