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Pensions, Other Post-employment Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits
      
Net Periodic Benefit Cost [Line Items]      
Service cost $ 30 $ 29 $ 30
Interest cost 77 83 85
Expected return on plan assets (62) (67) (60)
Amortization of actuarial losses 39 26 27
Amortization of prior service credit 1 0 0
Settlement gain (1) 0 0
Curtailment gain (1) 0 (1)
Net periodic benefit cost 83 71 81
Other Post-Employment Benefits
      
Net Periodic Benefit Cost [Line Items]      
Service cost 1 1 1
Interest cost 14 18 21
Expected return on plan assets 0 0 0
Amortization of actuarial losses 2 1 0
Amortization of prior service credit (14) (16) (12)
Settlement gain 0 0 0
Curtailment gain (51) (1) (29)
Net periodic benefit cost $ (48) $ 3 $ (19)