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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
U.S. Pension Benefits
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 41 45
Expected return on plan assets (48) (48)
Amortization    
Actuarial loss 16 11
Prior service credit (1) (1)
Settlement and curtailment (gain) loss 0 2
Net periodic benefit cost 8 9
Foreign Pension Plans, Defined Benefit
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 2
Interest cost 4 4
Expected return on plan assets (3) (2)
Amortization    
Actuarial loss 2 1
Prior service credit 0 0
Settlement and curtailment (gain) loss 0 0
Net periodic benefit cost 5 5
Other Postretirement Benefits
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 5 6
Expected return on plan assets 0 0
Amortization    
Actuarial loss 0 0
Prior service credit (10) (12)
Settlement and curtailment (gain) loss 0 0
Net periodic benefit cost $ (4) $ (5)