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Pension and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 69 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Amortization:            
Curtailment gain $ (16) $ (47) $ 0 $ (63) $ 0  
United States Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     3 3 2  
Interest cost     147 150 167  
Expected return on plan assets     (186) (191) (193)  
Amortization:            
Actuarial loss     46 53 43  
Prior service cost (credit)     (3) (3) (3)  
Curtailment gain     4 0 0  
Settlement loss     0 0 0  
Net periodic benefit cost     11 12 16  
Foreign Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     5 5 5  
Interest cost     27 31 22  
Expected return on plan assets     (30) (33) (16)  
Amortization:            
Actuarial loss     4 5 5  
Prior service cost (credit)     0 0 1  
Curtailment gain     (1) 0 0  
Settlement loss     3 12 4  
Net periodic benefit cost     8 20 21  
Other Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     7 2 3  
Interest cost     18 19 24  
Expected return on plan assets     0 0 0  
Amortization:            
Actuarial loss     0 0 0  
Prior service cost (credit)     (15) (23) (36)  
Curtailment gain     0 (63) 0  
Settlement loss     0 0 0  
Net periodic benefit cost     $ 10 $ (65) $ (9) $ 104