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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2017, were as follows:

	Total				Quoted Market Prices (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	(In millions)
Corporate debt securities	$	1,386			$	—			$	1,386			$	—
U.S. treasury notes	263				263				—				—
Government-sponsored enterprise securities (GSEs)	241				241				—				—
Municipal securities	140				—				140				—
Asset-backed securities	128				—				128				—
Certificates of deposit	34				—				34				—
Subtotal - current investments	2,192				504				1,688				—
Corporate debt securities	228				—				228				—
U.S. treasury notes	97				97				—				—
Subtotal - current restricted investments	325				97				228				—
1.125% Call Option derivative asset	440				—				—				440
Total assets	$	2,957			$	601			$	1,916			$	440
1.125% Conversion Option derivative liability	$	440			$	—			$	—			$	440
Total liabilities	$	440			$	—			$	—			$	440

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

	Total				Quoted Market Prices (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (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	$	2,025			$	315			$	1,443			$	267
1.125% Conversion Option derivative liability	$	267			$	—			$	—			$	267
Total liabilities	$	267			$	—			$	—			$	267

Schedule of fair value, asset and liabilities measured on recurring basis - disclosure only

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.

	June 30, 2017								December 31, 2016
	Carrying Value				Fair Value				Carrying Value				Fair Value
	(In millions)
5.375% Notes	$	692			$	745			$	691			$	714
1.125% Convertible Notes	483				976				471				792
4.875% Notes	325				333				—				—
1.625% Convertible Notes	289				386				284				344
	$	1,789			$	2,440			$	1,446			$	1,850

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- Definition

Schedule of Fair Value, Asset and Liabilities Measured on Recurring Basis [Table Text Block]

+ References

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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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