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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2011
Net Effect of Exchange Rate Fluctuations
Dec. 31, 2010
Net Effect of Exchange Rate Fluctuations
Dec. 31, 2009
Net Effect of Exchange Rate Fluctuations
Dec. 31, 2011
Deferred Tax Effect for Translation
Dec. 31, 2010
Deferred Tax Effect for Translation
Dec. 31, 2009
Deferred Tax Effect for Translation
Dec. 31, 2008
Deferred Tax Effect for Translation
Dec. 31, 2011
Change in Certain Derivative Instruments
Dec. 31, 2010
Change in Certain Derivative Instruments
Dec. 31, 2009
Change in Certain Derivative Instruments
Dec. 31, 2011
Employee Benefit Plans
Dec. 31, 2010
Employee Benefit Plans
Dec. 31, 2009
Employee Benefit Plans
Dec. 31, 2011
Accumulated Other Comprehensive Loss
Dec. 31, 2010
Accumulated Other Comprehensive Loss
Dec. 31, 2009
Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Income (Loss), Net of Tax                                      
Balance at beginning of the period     $ (1,321) $ 672 $ 290 $ 61 $ 13 $ 13 $ 13 $ 13 $ (16) $ (14) $ (38) $ (1,566) $ (1,607) $ (1,657) $ (897) $ (1,318) $ (1,621)
Change       (187) 382 229         (3) (2) 37 (218) 60 133 (408) 440 399
Translation effect                           1 (1) (34) 1 (1) (34)
Tax effect                           (8) (4) (14) (8) (4) (14)
Acquisition of noncontrolling interest 12     (9)                              
Intraperiod tax allocation 8 48                     (13)   (14) (35)   (14) (48)
Balance at end of the period (897)   (1,321) 476 672 290 13 13 13 13 (19) (16) (14) (1,791) (1,566) (1,607) (1,321) (897) (1,318)
Loss related due to entity's decision to translate the balance sheets of its Venezuelan subsidiaries using the parallel market rate   $ 133