Fair Value Measurements (Tables)

6 Months Ended

12 Months Ended

Sep. 30, 2021

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements at Reporting Date Using
	As of September 30, 2021		Quoted Prices in Active Markets  for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Balance Sheet  Classification
			(Level 1)		(Level 2)		(Level 3)
Assets
Bank and time deposits	$	25	$	25	$	—	$	—	Cash equivalents
Money market funds	112		112		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	152		—		152		—		Short-term investments
U.S. Treasury securities	65		65		—		—		Short-term investments
Commercial paper	35		—		35		—		Short-term investments
Foreign government securities	32		—		32		—		Short-term investments
Asset-backed securities	40		—		40		—		Short-term investments
Certificates of deposit	18		—		18		—		Short-term investments
Foreign currency derivatives	49		—		49		—		Other current assets and other assets
Deferred compensation plan assets (a)	23		23		—		—		Other assets
Total assets at fair value	$	551	$	225	$	326	$	—
Liabilities
Foreign currency derivatives	$	12	$	—	$	12	$	—	Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	23		23		—		—		Other liabilities
Total liabilities at fair value	$	35	$	23	$	12	$	—

			Fair Value Measurements at Reporting Date Using
	As of March 31, 2021		Quoted Prices in Active Markets for Identical Financial Instruments		Significant Other Observable Inputs		Significant Unobservable Inputs		Balance Sheet  Classification
			(Level 1)		(Level 2)		(Level 3)
Assets
Bank and time deposits	$	157	$	157	$	—	$	—	Cash equivalents
Money market funds	2,100		2,100		—		—		Cash equivalents
Available-for-sale securities:
Corporate bonds	380		—		380		—		Short-term investments and cash equivalents
U.S. Treasury securities	437		437		—		—		Short-term investments and cash equivalents
U.S. agency securities	3		—		3		—		Short-term investments
Commercial paper	142		—		142		—		Short-term investments and cash equivalents
Foreign government securities	67		—		67		—		Short-term investments
Asset-backed securities	112		—		112		—		Short-term investments
Certificates of deposit	41		—		41		—		Short-term investments
Foreign currency derivatives	33		—		33		—		Other current assets and other assets
Deferred compensation plan assets (a)	18		18		—		—		Other assets
Total assets at fair value	$	3,490	$	2,712	$	778	$	—
Liabilities
Foreign currency derivatives	$	40	$	—	$	40	$	—	Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a)	19		19		—		—		Other liabilities
Total liabilities at fair value	$	59	$	19	$	40	$	—

(a)The Deferred Compensation Plan assets consist of various mutual funds. See Note 15 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2021, for additional information regarding our Deferred Compensation Plan.