Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	$ (165)	$ (4)	$ (89)
Amounts reclassified from accumulated other comprehensive income (loss)	(186)	(272)	153
Other comprehensive income (loss) before reclassifications	(189)	(198)
Amounts reclassified from accumulated other comprehensive income (loss)	3	(74)	0
Income tax (provision) benefit	3	111	(68)
Balance as of the end of the period	(348)	(165)	(4)
Unrealized Gain (Loss) on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	1	0	(1)
Amounts reclassified from accumulated other comprehensive income (loss)			1
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	0	1	0
Balance as of the end of the period	1	1	0
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(151)	(3)	(23)
Amounts reclassified from accumulated other comprehensive income (loss)			55
Other comprehensive income (loss) before reclassifications	(193)	(188)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Income tax (provision) benefit	5	40	(35)
Balance as of the end of the period	(339)	(151)	(3)
Gain (Loss) from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(4)	(44)	(50)
Amounts reclassified from accumulated other comprehensive income (loss)			(2)
Other comprehensive income (loss) before reclassifications	(2)	(9)
Amounts reclassified from accumulated other comprehensive income (loss)	5	9	11
Income tax (provision) benefit	(1)	40	(3)
Balance as of the end of the period	(2)	(4)	(44)
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of the beginning of the period	(11)	43	(15)
Amounts reclassified from accumulated other comprehensive income (loss)			99
Other comprehensive income (loss) before reclassifications	6	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(83)	(11)
Income tax (provision) benefit	(1)	30	(30)
Balance as of the end of the period	$ (8)	$ (11)	$ 43