Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (4)	$ (89)	$ (90)
Current period change	(272)	153	11
Other comprehensive income (loss) before reclassifications	(198)	153
Amounts reclassified from accumulated other comprehensive income (loss)	(74)	0
Income tax (provision) benefit	111	(68)	(10)
Balance as of the end of the period	(165)	(4)	(89)
Unrealized Gain (Loss) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	0	(1)	(1)
Current period change			0
Other comprehensive income (loss) before reclassifications	0	1
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Income tax (provision) benefit	1	0	0
Balance as of the end of the period	1	0	(1)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(3)	(23)	(28)
Current period change			13
Other comprehensive income (loss) before reclassifications	(188)	55
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Income tax (provision) benefit	40	(35)	(8)
Balance as of the end of the period	(151)	(3)	(23)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(44)	(50)	(57)
Current period change			10
Other comprehensive income (loss) before reclassifications	(9)	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	9	11
Income tax (provision) benefit	40	(3)	(3)
Balance as of the end of the period	(4)	(44)	(50)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	43	(15)	(4)
Current period change			(12)
Other comprehensive income (loss) before reclassifications	(1)	99
Amounts reclassified from accumulated other comprehensive income (loss)	(83)	(11)
Income tax (provision) benefit	30	(30)	1
Balance as of the end of the period	$ (11)	$ 43	$ (15)