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Pension Benefit Plans and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
U.S Pension Plans
      
Changes in the pension and postretirement benefit obligations      
Obligations at beginning of year $ 2,437 $ 2,307  
Change in benefit obligations:      
Service cost 25 25 24
Interest cost 125 131 134
Actuarial (gain) loss, including the effect of change in discount rates 130 147  
Benefit payments (172) (173)  
Other 2    
Net change in benefit obligations 110 130  
Obligations at end of year 2,547 2,437 2,307
Changes in fair value of pension plan assets      
Fair value at beginning of year 2,195 2,061  
Actual gain (loss) on plan assets (13) 306  
Employer contributions 1 1  
Net change in fair value of assets (184) 134  
Fair value at end of year 2,011 2,195 2,061
Non-U.S. Pension Plans
      
Changes in the pension and postretirement benefit obligations      
Obligations at beginning of year 1,567 1,518  
Change in benefit obligations:      
Service cost 24 21 18
Interest cost 83 79 82
Actuarial (gain) loss, including the effect of change in discount rates (37) 59  
Participant contributions 8 7  
Benefit payments (87) (84)  
Curtailments   (3)  
Other 19    
Foreign currency translation (24) (30)  
Net change in benefit obligations (14) 49  
Obligations at end of year 1,553 1,567 1,518
Changes in fair value of pension plan assets      
Fair value at beginning of year 1,279 1,223  
Actual gain (loss) on plan assets 80 130  
Employer contributions 58 22  
Participant contributions 8 7  
Foreign currency translation (25) (18)  
Other 12 (1)  
Net change in fair value of assets 46 56  
Fair value at end of year 1,325 1,279 1,223
U.S Postretirement Benefit Plans
      
Changes in the pension and postretirement benefit obligations      
Obligations at beginning of year 195 201  
Change in benefit obligations:      
Service cost 1 1 1
Interest cost 10 11 12
Actuarial (gain) loss, including the effect of change in discount rates 4 (1)  
Benefit payments (16) (17)  
Net change in benefit obligations (1) (6)  
Obligations at end of year 194 195 201
Non-U.S. Postretirement Benefit Plans
      
Changes in the pension and postretirement benefit obligations      
Obligations at beginning of year 85 88  
Change in benefit obligations:      
Service cost 1 1 1
Interest cost 4 5 4
Actuarial (gain) loss, including the effect of change in discount rates 11 (10)  
Benefit payments (4) (3)  
Foreign currency translation (2) 4  
Net change in benefit obligations 10 (3)  
Obligations at end of year $ 95 $ 85 $ 88