Cash and Marketable Securities (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Cash and Marketable Securities [Abstract]

Amortized cost, fair value and gross unrealized gains and losses of the Company's short- and long-term investments in Debt and Equity securities

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(In millions)	Cost		Gains		Losses		Value
Available-for-sale and trading securities, September 30, 2014
Debt securities	$	70	$	1	$	—	$	71
Equity securities		34		8		(1)		41
Total securities	$	104	$	9	$	(1)	$	112
Available-for-sale and trading securities, December 31, 2013
Debt securities	$	97	$	3	$	(1)	$	99
Equity securities		41		9		—		50
Total securities	$	138	$	12	$	(1)	$	149

(In millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale and trading securities, December 31, 2013:
Debt securities	$	97	$	3	$	(1	)	$	99
Equity securities		41		9		—			50
Total securities	$	138	$	12	$	(1	)	$	149

(In millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale and trading securities, December, 31, 2012:
Debt securities	$	99	$	6	$	—		$	105
Equity securities		39		4		(2	)		41
Total securities	$	138	$	10	$	(2	)	$	146

Schedule of proceeds, gross realized gains, gross realized losses, each resulting from sales of available-for-sale securities and impairment charges due to other than temporary declines in the value of certain investments

	Nine Months Ended September 30,
(In millions)	2014			2013
Proceeds from sale of securities	$	43		$	8
Gross realized gains, pre-tax		5			1
Gross realized gains, net of tax		3			1
Gross realized losses, pre-tax		(1	)		—
Gross realized losses, net of tax		—			—

	Year Ended December 31,
(In millions)	2013			2012		2011
Proceeds from sales of securities	$	23		$	23	$	45
Gross realized gains, pre-tax		2			2		6
Gross realized gains, net of tax		1			1		4
Gross realized losses, pre-tax		(1	)		—		—