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Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Net Effect of Exchange Rate Fluctuations
Mar. 31, 2013
Change in Certain Derivative Instruments
Mar. 31, 2013
Employee Benefit Plans
Mar. 31, 2013
Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax              
Balance at beginning of the period $ (1,485) $ (1,506) $ (1,205) $ 455 $ (14) $ (1,947) $ (1,506)
Change before reclassifications       (28) 3   (25)
Amounts reclassified from accumulated other comprehensive income         1 37 38
Translation effect           10 10
Tax effect           (2) (2)
Other comprehensive income attributable to the Company       (28) 4 45 21
Balance at end of the period $ (1,485) $ (1,506) $ (1,205) $ 427 $ (10) $ (1,902) $ (1,485)