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Employee Benefit Plans - Change in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S.      
Change in Benefit Obligation      
Recognition of termination benefits     $ 14
Pension Plans Defined Benefit [Member] | U.S.      
Change in Benefit Obligation      
Benefit obligation at January 1 $ 3,236 $ 3,416  
Service cost 83 89 108
Interest cost 99 118 133
Plan participant contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss (44) 244  
Benefits paid (507) (631)  
Curtailment (4) 0  
Settlement (730) 0  
Recognition of termination benefits 3 0  
Foreign currency exchange rate change 0 0  
Benefit obligation at December 31 2,136 [1] 3,236 3,416
Change in Fair Value of Plan Assets      
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 2,541    
Actual return on plan assets (112) 336  
Company contributions 144 755  
Plan participant contributions 0 0  
Defined Benefit Plan Plan Assets Benefits Paid (507) (631)  
Settlement (730) 0  
Foreign currency exchange rate change 0 0  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,336 2,541  
Funded Status (800) (695)  
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]      
Change in Benefit Obligation      
Benefit obligation at January 1 3,845 3,445  
Service cost 81 77 76
Interest cost 107 103 120
Plan participant contributions 2 2  
Plan amendments 7 0  
Actuarial (gain) loss (259) 52  
Benefits paid (143) (117)  
Curtailment (3) 0  
Settlement 0 0  
Recognition of termination benefits 0 0  
Foreign currency exchange rate change (199) 283  
Benefit obligation at December 31 3,438 [1] 3,845 3,445
Change in Fair Value of Plan Assets      
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 3,647    
Actual return on plan assets (106) 313  
Company contributions 156 114  
Plan participant contributions 2 2  
Defined Benefit Plan Plan Assets Benefits Paid (143) (117)  
Settlement   0  
Foreign currency exchange rate change (198) 267  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 3,358 3,647  
Funded Status (80) (198)  
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Change in Benefit Obligation      
Benefit obligation at January 1 265 286  
Service cost 1 2 2
Interest cost 8 9 13
Plan participant contributions 22 23  
Plan amendments 0 0  
Actuarial (gain) loss (10) 12  
Benefits paid (67) (68)  
Curtailment 0 0  
Settlement 0 0  
Recognition of termination benefits 0 0  
Foreign currency exchange rate change (1) 1  
Benefit obligation at December 31 218 265 $ 286
Change in Fair Value of Plan Assets      
Actual return on plan assets 0 0  
Company contributions 45 45  
Plan participant contributions 22 23  
Defined Benefit Plan Plan Assets Benefits Paid (67) (68)  
Foreign currency exchange rate change 0 0  
Funded Status $ (218) $ (265)  
[1]
*Accumulated benefit obligation portion of above at December 31: $1,969; $3,066; $3,076; $3,404