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Employee Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Benefits    
Net Periodic Benefit Cost    
Net Periodic Other Benefit Costs $ 229 $ 270
Pension Benefits | United States    
Net Periodic Benefit Cost    
Service cost 120 122
Interest cost 92 91
Expected return on plan assets (159) (149)
Amortization of prior service credits 1 (1)
Amortization of actuarial losses 76 85
Settlement losses 66 78
Net Periodic Other Benefit Costs 196 226
Pension Benefits | International    
Net Periodic Benefit Cost    
Service cost 40 37
Interest cost 46 53
Expected return on plan assets (66) (58)
Amortization of prior service credits 2 3
Amortization of actuarial losses 11 9
Settlement losses 0 0
Net Periodic Other Benefit Costs 33 44
Other Benefits    
Net Periodic Benefit Cost    
Service cost 13 8
Interest cost 21 23
Amortization of prior service credits (7) (7)
Amortization of actuarial losses 4 (1)
Net Periodic Other Benefit Costs $ 31 $ 23