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Employee Retirement Plans (Obligations and Funded Status Schedule) (Details) - Pension Benefits [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation          
Benefit obligation at beginning of year $ 4,188 $ 3,887      
Service cost 103 92 $ 85    
Interest cost 132 126 124    
Plan participants’ contributions 1 2      
Plan amendments 21        
Actuarial loss (gain) (210) 208      
Other (1) 3      
Benefits paid (202) (195)      
Foreign currency translation (29) 65      
Benefit obligation at end of year 4,003 4,188 3,887    
Change in plan assets          
Fair value of plan assets at beginning of year 3,539 3,225      
Actual return on plan assets (201) 413      
Employer contributions 135 46      
Plan participants’ contributions 1 1      
Benefits paid (208) (195)      
Foreign currency translation (27) 49      
Fair value of plan assets at end of year 3,239 3,539 3,225    
Funded status at end of year          
Fair value of plan assets 3,539 3,225 3,225 $ 3,239 $ 3,539
Benefit obligations (4,188) (3,887) (3,887) (4,003) (4,188)
Funded status of plans       (764) (649)
Amounts recognized in the consolidated balance sheets consist of:          
Noncurrent asset       81 76
Current liability       (29) (20)
Noncurrent liability       (816) (705)
Recognized liability       (764) (649)
Amounts recognized in accumulated other comprehensive income consist of:          
Net actuarial loss       338 300
Prior service cost (credit)       36 22
Amount recognized at end of year       374 322
United States [Member]          
Change in benefit obligation          
Benefit obligation at beginning of year 3,522 3,289      
Service cost 78 66 61    
Interest cost 116 112 111    
Plan participants’ contributions 1 1      
Plan amendments 20        
Actuarial loss (gain) (200) 222      
Other   3      
Benefits paid (179) (171)      
Benefit obligation at end of year 3,358 3,522 3,289    
Change in plan assets          
Fair value of plan assets at beginning of year 3,004 2,765      
Actual return on plan assets (202) 395      
Employer contributions 118 14      
Plan participants’ contributions 1 1      
Benefits paid (179) (171)      
Fair value of plan assets at end of year 2,742 3,004 2,765    
Funded status at end of year          
Fair value of plan assets 3,004 2,765 2,765 2,742 3,004
Benefit obligations (3,522) (3,289) (3,289) (3,358) (3,522)
Funded status of plans       (616) (518)
Amounts recognized in the consolidated balance sheets consist of:          
Current liability       (13) (12)
Noncurrent liability       (603) (506)
Recognized liability       (616) (518)
Amounts recognized in accumulated other comprehensive income consist of:          
Net actuarial loss       324 285
Prior service cost (credit)       37 25
Amount recognized at end of year       361 310
International [Member]          
Change in benefit obligation          
Benefit obligation at beginning of year 666 598      
Service cost 25 26 24    
Interest cost 16 14 13    
Plan participants’ contributions   1      
Plan amendments 1        
Actuarial loss (gain) (10) (14)      
Other (1)        
Benefits paid (23) (24)      
Foreign currency translation (29) 65      
Benefit obligation at end of year 645 666 598    
Change in plan assets          
Fair value of plan assets at beginning of year 535 460      
Actual return on plan assets 1 18      
Employer contributions 17 32      
Benefits paid (29) (24)      
Foreign currency translation (27) 49      
Fair value of plan assets at end of year 497 535 460    
Funded status at end of year          
Fair value of plan assets 535 460 460 497 535
Benefit obligations $ (666) $ (598) $ (598) (645) (666)
Funded status of plans       (148) (131)
Amounts recognized in the consolidated balance sheets consist of:          
Noncurrent asset       81 76
Current liability       (16) (8)
Noncurrent liability       (213) (199)
Recognized liability       (148) (131)
Amounts recognized in accumulated other comprehensive income consist of:          
Net actuarial loss       14 15
Prior service cost (credit)       (1) (3)
Amount recognized at end of year       $ 13 $ 12