Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2019

Financial Instruments [Abstract]

Fair Value Of Short-Term Investments

Short-term investments consisted of the following as of March 31, 2019 and 2018 (in millions):

	As of March 31, 2019									As of March 31, 2018
	Cost or Amortized Cost		Gross Unrealized					Fair Value		Cost or Amortized Cost		Gross Unrealized					Fair Value
			Gains		Losses							Gains		Losses
Corporate bonds	$	325	$	—	$	(1	)	$	324	$	629	$	—	$	(5	)	$	624
U.S. Treasury securities	153		—		—			153		212		—		(2		)	210
U.S. agency securities	44		—		—			44		79		—		(1		)	78
Commercial paper	112		—		—			112		109		—		—			109
Foreign government securities	50		—		—			50		53		—		(1		)	52
Asset-backed securities	53		—		—			53		—		—		—			—
Certificates of deposit	1		—		—			1		—		—		—			—
Short-term investments	$	738	$	—	$	(1	)	$	737	$	1,082	$	—	$	(9	)	$	1,073

Fair Value Of Short-Term Investments By Stated Maturity Date Schedule

The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of March 31, 2019 and 2018 (in millions):

	As of March 31, 2019				As of March 31, 2018
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Short-term investments
Due within 1 year	$	449	$	448	$	521	$	520
Due 1 year through 5 years	287		287		561		553
Due after 5 years	2		2		—		—
Short-term investments	$	738	$	737	$	1,082	$	1,073