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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair value of assets measured on recurring basis

Our financial instruments measured at fair value on a recurring basis at December 31, 2017, were as follows:

	Total				Level 1				Level 2				Level 3
	(In millions)
Corporate debt securities	$	1,588			$	—			$	1,588			$	—
U.S. treasury notes	388				388				—				—
Government-sponsored enterprise securities (GSEs)	253				253				—				—
Municipal securities	141				—				141				—
Asset-backed securities	117				—				117				—
Certificates of deposit	37				—				37				—
Subtotal - current investments	2,524				641				1,883				—
Corporate debt securities	101				—				101				—
U.S. treasury notes	68				68				—				—
Subtotal - current restricted investments	169				68				101				—
1.125% Call Option derivative asset	522				—				—				522
Total assets measured at fair value on a recurring basis	$	3,215			$	709			$	1,984			$	522
1.125% Conversion Option derivative liability	$	522			$	—			$	—			$	522
Total liabilities measured at fair value on a recurring basis	$	522			$	—			$	—			$	522

Our financial instruments measured at fair value on a recurring basis at December 31, 2016, were as follows:

	Total				Level 1				Level 2				Level 3
	(In millions)
Corporate debt securities	$	1,179			$	—			$	1,179			$	—
U.S. treasury notes	84				84				—				—
GSEs	231				231				—				—
Municipal securities	142				—				142				—
Asset-backed securities	69				—				69				—
Certificates of deposit	53				—				53				—
Subtotal - current investments	1,758				315				1,443				—
1.125% Call Option derivative asset	267				—				—				267
Total assets measured at fair value on a recurring basis	$	2,025			$	315			$	1,443			$	267
1.125% Conversion Option derivative liability	$	267			$	—			$	—			$	267
Total liabilities measured at fair value on a recurring basis	$	267			$	—			$	—			$	267

Fair value measurements of senior notes

	December 31, 2017								December 31, 2016
	Carrying				Fair Value				Carrying				Fair Value
	Value								Value
	(In millions)
5.375% Notes	$	692			$	730			$	691			$	714
1.125% Convertible Notes	496				1,052				471				792
4.875% Notes	325				329				—				—
Credit Facility	300				300				—				—
1.625% Convertible Notes	157				220				284				344
	$	1,970			$	2,631			$	1,446			$	1,850

X

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2C
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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