Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (89)	$ (90)	$ (90)
Current period change	153	11	6
Other comprehensive income (loss) before reclassifications	153
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	(68)	(10)	(6)
Balance as of the end of the period	(4)	(89)	(90)
Unrealized Gain (Loss) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(1)	(1)	(1)
Current period change		0	0
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	0	0	0
Balance as of the end of the period	0	(1)	(1)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(23)	(28)	(1)
Current period change		13	(29)
Other comprehensive income (loss) before reclassifications	55
Amounts reclassified from accumulated other comprehensive income (loss)	0
Income tax (provision) benefit	(35)	(8)	2
Balance as of the end of the period	(3)	(23)	(28)
Gain (Loss) on Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(50)	(57)	(84)
Current period change		10	37
Other comprehensive income (loss) before reclassifications	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	11
Income tax (provision) benefit	(3)	(3)	(10)
Balance as of the end of the period	(44)	(50)	(57)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(15)	(4)	(4)
Current period change		(12)	(2)
Other comprehensive income (loss) before reclassifications	99
Amounts reclassified from accumulated other comprehensive income (loss)	(11)
Income tax (provision) benefit	(30)	1	2
Balance as of the end of the period	$ 43	$ (15)	$ (4)