Cash and Cash Equivalents and Investments in Marketable Securities (Tables)

12 Months Ended

Mar. 31, 2019

Summary of Investments in Marketable Securities

Investments in marketable securities consisted of the following:

	March 31, 2019
	Amortized		Unrealized		Unrealized			Fair
	cost		gains		losses			value
Available-for-sale debt securities:
U.S. government and agency obligations	$	213	$	2	$	(3	)	$	212
Municipal debt securities		9		2	-				11
Certificates of deposit		50	-		-				50
Commercial paper		70	-		-				70
Corporate debt securities		160		3		(1	)		162
Mortgage-backed securities:
U.S. government agency		35	-		-				35
Non-agency residential		1	-		-				1
Non-agency commercial		39	-		-				39
Asset-backed securities		52		1	-				53
Total available-for-sale debt securities	$	629	$	8	$	(4	)	$	633
Equity investments								$	2,275
Total investments in marketable securities								$	2,908

	March 31, 2018
	Amortized		Unrealized		Unrealized			Fair
	cost		gains		losses			value
Available-for-sale securities:
Debt securities:
U.S. government and agency obligations	$	2,821	$	-	$	(23	)	$	2,798
Municipal debt securities		10		1		-			11
Certificates of deposit		475		-		(1	)		474
Commercial paper		52		-		-			52
Corporate debt securities		203		1		(3	)		201
Mortgage-backed securities:
U.S. government agency		38		1		-			39
Non-agency residential		1		1		-			2
Non-agency commercial		30		-		(1	)		29
Asset-backed securities		39		-		-			39
Equity investments		2,196		11		(23	)		2,184
Total investments in marketable securities	$	5,865	$	15	$	(51	)	$	5,829

Schedule of Gains and Losses on Investments in Marketable Securities Presented in Our Consolidated Statement of Income

The following table represents gains and losses on our investments in marketable securities presented in our Consolidated Statements of Income:


	Years Ended March 31,
	2019			2018		2017
Available-for-sale securities:
Realized (losses) gains	$	(12	)	$	41	$	226

Equity investments:
Unrealized gains recognized	$	14

Summary of Contractual Maturities of Available-For-Sale Debt Securities

The amortized cost, fair value and contractual maturities of available-for-sale debt securities are summarized in the following table. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay certain obligations.

	March 31, 2019
	Amortized Cost		Fair Value
Available-for-sale debt securities:
Due within 1 year	$	177	$	177
Due after 1 year through 5 years		102		102
Due after 5 years through 10 years		146		147
Due after 10 years		77		79
Mortgage-backed and asset-backed securities¹		127		128
Total	$	629	$	633

¹ Mortgage-backed and asset-backed securities are shown separately from other maturity groupings as these securities have multiple maturity dates.