Investments (Tables)

12 Months Ended

Dec. 31, 2014

Investments [Abstract]

Fair value of short and long-term investments classified as available for sale

	December 31, 2014
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Short-term investments:
Restricted cash	$	29	$	—	$	—		$	29
Corporate debt securities	2,519		1		(1		)	2,519
Government and agency securities	3		—		—			3
Time deposits and other	181		—		—			181
Equity instruments	10		1,028		—			1,038
	$	2,742	$	1,029	$	(1	)	$	3,770
Long-term investments:
Corporate debt securities	5,319		18		(18		)	5,319
Government and agency securities	232		1		—			233
	$	5,551	$	19	$	(18	)	$	5,552

	December 31, 2013
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Short-term investments:
Restricted cash	$	17	$	—	$	—		$	17
Corporate debt securities	3,525		4		—			3,529
Government and agency securities	43		—		—			43
Time deposits and other	49		—		—			49
Equity instruments	12		881		—			893
	$	3,646	$	885	$	—		$	4,531
Long-term investments:
Corporate debt securities	4,409		41		(5		)	4,445
Government and agency securities	250		1		—			251
	$	4,659	$	42	$	(5	)	$	4,696

Estimated fair values of short and long-term investments classified by date of contractual maturity

	December 31, 2014
	(In millions)
One year or less (including restricted cash of $29)	$	2,732
One year through two years	1,550
Two years through three years	2,055
Three years through four years	1,106
Four years through five years	736
Five years through six years	86
Six years through seven years	2
Seven years through eight years	—
Eight years through nine years	17
Nine years through ten years	—
	$	8,284