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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, were as follows:

	Total				Level 1				Level 2				Level 3
	(In millions)
Corporate debt securities	$	1,179			$	—			$	1,179			$	—
Government-sponsored enterprise securities (GSEs)	231				231				—				—
Municipal securities	142				—				142				—
U.S. treasury notes	84				84				—				—
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

Our financial instruments measured at fair value on a recurring basis at December 31, 2015, were as follows:

	Total				Level 1				Level 2				Level 3
	(In millions)
Corporate debt securities	$	1,184			$	—			$	1,184			$	—
GSEs	211				211				—				—
Municipal securities	185				—				185				—
U.S. treasury notes	78				78				—				—
Asset-backed securities	63				—				63				—
Certificates of deposit	80				—				80				—
Subtotal - current investments	1,801				289				1,512				—
1.125% Call Option derivative asset	374				—				—				374
Total assets measured at fair value on a recurring basis	$	2,175			$	289			$	1,512			$	374
1.125% Conversion Option derivative liability	$	374			$	—			$	—			$	374
Total liabilities measured at fair value on a recurring basis	$	374			$	—			$	—			$	374

Fair value measurements of senior notes

The carrying amounts and estimated fair values of our senior notes, which are classified as Level 2 financial instruments, are indicated in the following table.

	December 31, 2016								December 31, 2015
	Carrying				Fair Value				Carrying				Fair Value
	Value								Value
	(In millions)
5.375% Notes	$	691			$	714			$	689			$	700
1.125% Convertible Notes	471				792				448				865
1.625% Convertible Notes	284				344				273				365
	$	1,446			$	1,850			$	1,410			$	1,930

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

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-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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