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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plans Defined Benefit [Member] | U.S.        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 20 $ 21 $ 63 $ 67
Interest cost 22 29 76 90
Expected return on plan assets (22) (32) (91) (97)
Amortization of prior service cost (credit) 0 1 0 3
Recognized net actuarial (gain) loss 10 17 41 53
Settlements 14 21 161 118
Curtailments (gain) loss 0 0 0 0
Net periodic benefit cost 44 57 250 234
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 20 20 63 59
Interest cost 26 27 80 78
Expected return on plan assets (38) (41) (118) (119)
Amortization of prior service cost (credit) (1) (1) (4) (4)
Recognized net actuarial (gain) loss 9 12 27 36
Settlements 0 0 0 0
Curtailments (gain) loss (1) 0 (1) 0
Net periodic benefit cost 15 17 47 50
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 1 1
Interest cost 2 3 6 7
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (9) (9) (26) (27)
Recognized net actuarial (gain) loss 0 (1) (1) (2)
Settlements 0 0 0 0
Curtailments (gain) loss 0 0 0 0
Net periodic benefit cost $ (7) $ (7) $ (20) $ (21)