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Employee Benefits - Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 114 $ 297 $ 304 $ 775
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 117 108 235 225
Interest cost 69 64 135 119
Expected return on plan assets (162) (145) (323) (294)
Amortization of prior service costs (credits) 1 0 1 1
Amortization of actuarial losses (gains) 60 73 125 177
Settlement losses 21 151 107 468
Net Periodic Other Benefit Costs 106 251 280 696
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 21 37 43 71
Interest cost 35 36 71 69
Expected return on plan assets (44) (43) (92) (89)
Amortization of prior service costs (credits) 1 2 3 4
Amortization of actuarial losses (gains) 4 14 8 24
Settlement losses (9) 0 (9) 0
Net Periodic Other Benefit Costs 8 46 24 79
Other Benefits        
Net Periodic Benefit Cost        
Service cost 10 10 21 21
Interest cost 16 13 31 26
Amortization of prior service costs (credits) (7) (6) (13) (13)
Amortization of actuarial losses (gains) 3 4 6 8
Net Periodic Other Benefit Costs $ 22 $ 21 $ 45 $ 42