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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
U.S. Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 1 $ 1
Interest cost 40 44 81 89
Expected return on plan assets (48) (49) (96) (97)
Amortization        
Actuarial loss 15 12 31 23
Prior service credit 0 (1) (1) (2)
Settlement and curtailment (gain) loss 0 2 0 4
Net periodic benefit cost 8 9 16 18
Foreign Pension Plans, Defined Benefit
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 3
Interest cost 4 5 8 9
Expected return on plan assets (2) (3) (5) (5)
Amortization        
Actuarial loss 1 1 3 2
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 1 0 1 0
Net periodic benefit cost 5 4 10 9
Other Postretirement Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 2 3
Interest cost 4 5 9 11
Expected return on plan assets 0 0 0 0
Amortization        
Actuarial loss 0 0 0 0
Prior service credit (9) (11) (19) (23)
Settlement and curtailment (gain) loss 0 (49) 0 (49)
Net periodic benefit cost $ (4) $ (53) $ (8) $ (58)