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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
U.S. Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 42 41 126 122
Expected return on plan assets (49) (48) (145) (144)
Amortization        
Actuarial loss 11 16 32 47
Prior service credit 0 (1) (2) (2)
Settlement and curtailment loss 0 3 0 3
Net periodic benefit cost (credit) 5 12 13 28
Foreign Pension Plans, Defined Benefit
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 4 5 13 13
Expected return on plan assets (2) (3) (8) (8)
Amortization        
Actuarial loss 1 2 4 5
Prior service credit 0 0 0 0
Settlement and curtailment loss 0 0 2 1
Net periodic benefit cost (credit) 4 5 15 15
Other Postretirement Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 3
Interest cost 7 4 19 13
Expected return on plan assets 0 0 0 0
Amortization        
Actuarial loss 0 1 0 1
Prior service credit (10) (10) (29) (29)
Settlement and curtailment loss 0 0 0 0
Net periodic benefit cost (credit) $ (2) $ (4) $ (8) $ (12)