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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 54 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Amortization:            
Curtailment gain $ (16) $ (47) $ (63) $ 0 $ 0  
United States Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     3 2 2  
Interest cost     150 167 162  
Expected return on plan assets     (191) (193) (191)  
Amortization:            
Actuarial loss     53 43 62  
Prior service cost (credit)     (3) (3) (3)  
Curtailment gain     0 0 0  
Settlement loss     0 0 3  
Net periodic benefit cost     12 16 35  
Foreign Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     5 5 6  
Interest cost     31 22 17  
Expected return on plan assets     (33) (16) (10)  
Amortization:            
Actuarial loss     5 5 6  
Prior service cost (credit)     0 1 1  
Curtailment gain     0 0 0  
Settlement loss     12 4 1  
Net periodic benefit cost     20 21 21  
Other Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Service cost     2 3 4  
Interest cost     19 24 18  
Expected return on plan assets     0 0 0  
Amortization:            
Actuarial loss     0 0 1  
Prior service cost (credit)     (23) (36) (39)  
Curtailment gain     (63) 0 0  
Settlement loss     0 0 0  
Net periodic benefit cost     $ (65) $ (9) $ (16) $ 106