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Employee Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 234 $ 280 $ 463 $ 550
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 120 122 240 244
Interest cost 93 92 185 183
Expected return on plan assets (159) (149) (318) (298)
Amortization of prior service credits 0 (1) 1 (2)
Amortization of actuarial losses 76 85 152 170
Settlement losses 66 78 132 156
Net Periodic Other Benefit Costs 196 227 392 453
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 33 39 73 76
Interest cost 60 57 106 110
Expected return on plan assets (65) (59) (131) (117)
Amortization of prior service credits 4 3 6 6
Amortization of actuarial losses 6 13 17 22
Settlement losses 0 0 0 0
Net Periodic Other Benefit Costs 38 53 71 97
Other Benefits        
Net Periodic Benefit Cost        
Service cost 8 8 21 16
Interest cost 27 25 48 48
Amortization of prior service credits (7) (7) (14) (14)
Amortization of actuarial losses 3 (2) 7 (3)
Net Periodic Other Benefit Costs $ 31 $ 24 $ 62 $ 47