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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Change in benefit obligation, plan assets and the funded status of the defined benefit pension plans.    
Fair value of plan assets at end of year $ 419 $ 203
Pension benefits [Member]
    
Change in benefit obligation, plan assets and the funded status of the defined benefit pension plans.    
Benefit obligation at beginning of year 272 262
Service cost 7 5
Interest cost 19 14
Actuarial loss (gain) (14) 10
Benefits paid (14) (12)
Participants contributions 1 1
Exchange rate loss (gain) (6) (7)
Acquisitions 299  
Curtailments (9)  
Other 1 (1)
Benefit obligation at end of year 556 272
Fair value of plan assets at beginning of year 203 193
Actual return 19 18
Company contributions 19 8
Acquisitions 196  
Other   (1)
Fair value of plan assets at end of year 419 203
Funded status (137) (69)
Accumulated benefit obligation at end of year 527 254
Postretirement benefits [Member]
    
Change in benefit obligation, plan assets and the funded status of the defined benefit pension plans.    
Benefit obligation at beginning of year 33 39
Interest cost 1 2
Actuarial loss (gain) 1 (3)
Benefits paid (5) (5)
Acquisitions 5  
Benefit obligation at end of year 35 33
Fair value of plan assets at beginning of year 0 0
Company contributions 5 5
Fair value of plan assets at end of year 0 0
Funded status (35) (33)
Accumulated benefit obligation at end of year $ 0 $ 0