Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Objectives for Using Derivative Instruments	The Company’s objective in managing exposure to market risk is to limit the impact on earnings and cash flow.
Net loss to be reclassified to earnings	$ (37)
Loss, net of tax, expected to be reclassified to earnings	(29)
Reclassification of anticipated transactions that were no longer considered probable	0
Changes in fair value of the derivative financial instruments, excluded from the assessment and measurement of hedge effectiveness reported in earnings	1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(20)	39
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on foreign exchange contracts designated as fair value hedges	(6)	2
Gain (loss) on foreign exchange contracts not designated as fair value hedges	$ (12)	$ 1
Minimum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Lower Remaining Maturity Range	1 month
Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Higher Remaining Maturity Range	33 months