Investments in Marketable Securities (Tables)

9 Months Ended

Dec. 31, 2018

Summary of Investments in Marketable Securities

Investments in marketable securities consisted of the following:

	December 31, 2018
	Amortized		Unrealized		Unrealized			Fair
	cost		gains		losses			value
Available-for-sale debt securities:
U.S. government and agency obligations	$	209	$	1	$	(5	)	$	205
Municipal debt securities		9		1	-				10
Commercial paper		189	-		-				189
Corporate debt securities		180	-			(5	)		175
Mortgage-backed securities:
U.S. government agency		36		1		(1	)		36
Non-agency residential		1		1	-				2
Non-agency commercial		40	-			(1	)		39
Asset-backed securities		48	-		-				48
Total available-for-sale debt securities	$	712	$	4	$	(12	)	$	704
Equity investments								$	2,198
Total investments in marketable securities								$	2,902

	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:

	Three Months Ended					Nine Months Ended
	December 31,					December 31,
	2018			2017		2018			2017
Available-for-sale securities:
Realized (losses) gains	$	(11	)	$	3	$	(12	)	$	45

Equity investments:
Unrealized losses recognized	$	(8	)			$	(48	)

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.

	December 31, 2018
	Amortized Cost		Fair Value
Available-for-sale debt securities:
Due within 1 year	$	264	$	264
Due after 1 year through 5 years		96		95
Due after 5 years through 10 years		156		152
Due after 10 years		71		68
Mortgage-backed and asset-backed securities¹		125		125
Total	$	712	$	704

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