Investments in Marketable Securities (Tables)

6 Months Ended

Sep. 30, 2019

Summary of Investments in Marketable Securities

Investments in marketable securities consisted of the following:

	September 30, 2019
	Amortized		Unrealized		Unrealized		Fair
	cost		gains		losses		value
Available-for-sale debt securities:
U.S. government and agency obligations	$	196	$	8	$	-	$	204
Municipal debt securities		9		2		-		11
Certificates of deposit		150		-		-		150
Commercial paper		350		-		-		350
Corporate debt securities		164		10		-		174
Mortgage-backed securities:
U.S. government agency		32		1		-		33
Non-agency residential		1		-		-		1
Non-agency commercial		44		1		-		45
Asset-backed securities		79		2		-		81
Total available-for-sale debt securities	$	1,025	$	24	$	-	$	1,049
Equity investments							$	2,403
Total investments in marketable securities							$	3,452

	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

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					Six Months Ended
	September 30,					September 30,
	2019		2018			2019		2018
Available-for-sale debt securities:
Realized gains (losses)	$	1	$	(1	)	$	1	$	(1	)

Equity investments:
Unrealized gains (losses) recognized	$	31	$	(15	)	$	86	$	(40	)
Realized gains (losses) on sales	$	1	$	-		$	3	$	-

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

The amortized cost and fair value, by contractual maturity 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.

	September 30, 2019
	Amortized Cost		Fair Value
Available-for-sale debt securities:
Due within 1 year	$	542	$	542
Due after 1 year through 5 years		128		130
Due after 5 years through 10 years		124		131
Due after 10 years		75		86
Mortgage-backed and asset-backed securities¹		156		160
Total	$	1,025	$	1,049

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