Stockholders' Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cumulative translation adjustment	$ (244)	$ 213	$ 219
Net revaluation and clearance of cash flow hedges to earnings	41	(31)	(65)
Net unrealized gain (loss) on securities	3	2	1
Accumulated other comprehensive loss	(8,750)	(5,790)	(5,771)
Pension Plans, Defined Benefit [Member]
Net losses	(8,204)	(5,950)	(5,873)
Net prior service (cost) benefit	(72)	(82)	(94)
Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Net losses	(824)	(577)	(551)
Net prior service (cost) benefit	$ 550	$ 635	$ 592