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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of accumulated other comprehensive income (loss)      
Defined Benefit Plans, Beginning balance $ (48) $ (49) $ (40)
Currency Translation Adjustments, Beginning balance 133 120 20
Derivative Financial Instruments, Beginning balance 6 19 (141)
Total, Beginning balance 91 90 (161)
Defined Benefit Plans, Current period activity 19 1 (14)
Currency Translation Adjustments, Current period activity (86) 19 150
Derivative Financial Instruments, Current period activity (88) (17) 223
Total, Current period activity (155) 3 359
Defined Benefit Plans, Tax effect (5)   5
Currency Translation Adjustments, Tax effect 21 (6) (50)
Derivative Financial Instruments, Tax effect 25 4 (63)
Total, Tax effect 41 (2) (108)
Defined Benefit Plans, Ending balance (34) (48) (49)
Currency Translation Adjustments, Ending balance 68 133 120
Derivative Financial Instruments, Ending balance (57) 6 19
Total, Ending balance $ (23) $ 91 $ 90