Investments (Tables)

9 Months Ended

Sep. 30, 2015

Investments [Abstract]

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

At September 30, 2015 and December 31, 2014, the estimated fair value of our short-term and long-term investments classified as available for sale, were as follows:

	September 30, 2015
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Short-term investments:
Restricted cash	$	30	$	—	$	—		$	30
Corporate debt securities	2,039		1		(1		)	2,039
Government and agency securities	55		—		—			55
Time deposits and other	50		—		—			50
Equity instruments	9		731		—			740
	$	2,183	$	732	$	(1	)	$	2,914
Long-term investments:
Corporate debt securities	3,468		15		(34		)	3,449
	$	3,468	$	15	$	(34	)	$	3,449

	December 31, 2014
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Short-term investments:
Restricted cash	$	19	$	—	$	—		$	19
Corporate debt securities	2,519		1		(1		)	2,519
Government and agency securities	3		—		—			3
Time deposits and other	152		—		—			152
Equity instruments	9		1,028		—			1,037
	$	2,702	$	1,029	$	(1	)	$	3,730
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

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

The estimated fair values of our short-term and long-term investments classified as available for sale by date of contractual maturity at September 30, 2015 are as follows:

	September 30, 2015
	(In millions)
One year or less (including restricted cash of $30)	$	2,174
One year through two years	1,186
Two years through three years	1,273
Three years through four years	866
Four years through five years	115
Five years through six years	—
Six years through seven years	—
Seven years through eight years	8
Eight years through nine years	—
Nine years through ten years	1
	$	5,623