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Pension and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amortization:      
Curtailment gain $ 0 $ (52) $ (35)
United States Pension Benefits
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2 2 2
Interest cost 162 178 192
Expected return on plan assets (191) (194) (194)
Amortization:      
Actuarial loss 62 46 31
Prior service cost (credit) (3) (3) (3)
Curtailment gain 0 0 0
Settlement loss 3 5 0
Net periodic benefit cost 35 34 28
Foreign Pension Benefits
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 6 7
Interest cost 17 20 20
Expected return on plan assets (10) (11) (10)
Amortization:      
Actuarial loss 6 4 4
Prior service cost (credit) 1 1 1
Curtailment gain 0 0 0
Settlement loss 1 3 2
Net periodic benefit cost 21 23 24
Other Postretirement Benefits
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 4 5 8
Interest cost 18 21 31
Expected return on plan assets 0 0 0
Amortization:      
Actuarial loss 1 1 1
Prior service cost (credit) (39) (42) (43)
Curtailment gain 0 (52) (35)
Settlement loss 0 0 0
Net periodic benefit cost $ (16) $ (67) $ (38)