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Employee Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 221 $ 234 $ 437 $ 463
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 102 120 203 240
Interest cost 99 93 198 185
Expected return on plan assets (141) (159) (282) (318)
Amortization of prior service costs (credits) 1 0 1 1
Amortization of actuarial losses (gains) 59 76 119 152
Settlement losses 60 66 120 132
Net Periodic Other Benefit Costs 180 196 359 392
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 36 33 71 73
Interest cost 53 60 104 106
Expected return on plan assets (57) (65) (115) (131)
Amortization of prior service costs (credits) 3 4 6 6
Amortization of actuarial losses (gains) 6 6 11 17
Settlement losses 0 0 1 0
Net Periodic Other Benefit Costs 41 38 78 71
Other Benefits        
Net Periodic Benefit Cost        
Service cost 9 8 18 21
Interest cost 24 27 48 48
Amortization of prior service costs (credits) (7) (7) (14) (14)
Amortization of actuarial losses (gains) 0 3 (1) 7
Net Periodic Other Benefit Costs $ 26 $ 31 $ 51 $ 62