Fair Value (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

	December 31, 2017		Level 1		Level 2		Level 3
Available-for-sale securities	$	252	$	132	$	120	$	-
Trading securities		37		37		-		-
Fair value of interest rate swap agreements		1		-		1		-
Total assets	$	290	$	169	$	121	$	-
Contingent Value Right (CVR)	$	2	$	2	$	-	$	-
CVR-related liability		256		-		-		256
Fair value of interest rate swap agreements		18		-		18		-
Total liabilities	$	276	$	2	$	18	$	256
	December 31, 2016		Level 1		Level 2		Level 3
Available-for-sale securities	$	299	$	163	$	136	$	-
Trading securities		80		80		-		-
Total assets	$	379	$	243	$	136	$	-
Contingent Value Right (CVR)	$	1	$	1	$	-	$	-
CVR-related liability		252		-		-		252
Fair value of interest rate swap agreements		49		-		49		-
Total liabilities	$	302	$	1	$	49	$	252

Available-for-sale Securities

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Values
As of December 31, 2017:
Debt securities and debt-based mutual funds
Government and corporate	$	189	$	-	$	(4)	$	185
Equity securities and equity-based mutual funds
Domestic		51		10		-		61
International		5		1		-		6
Totals	$	245	$	11	$	(4)	$	252

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Values
As of December 31, 2016:
Debt securities and debt-based mutual funds
Government and corporate	$	232	$	-	$	(9)	$	223
Equity securities and equity-based mutual funds
Domestic		67		3		-		70
International		6		-		-		6
Totals	$	305	$	3	$	(9)	$	299

Contractual Maturities of Debt Securities

	December 31, 2017				December 31, 2016
	Amortized		Estimated		Amortized		Estimated
	Cost		Fair Values		Cost		Fair Values
Within 1 year	$	4	$	4	$	2	$	2
After 1 year and through year 5		46		46		40		40
After 5 years and through year 10		32		31		42		40
After 10 years		41		40		57		54

Gross Realized Gains and Losses and Investment Income on Available-for-sale Securities

	Year Ended December 31,
	2017		2016		2015
Realized gains	$	3	$	28	$	8
Realized losses		(2)		(6)		(6)
Investment income		8		7		8