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Employee Benefits - Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 331 $ 231 $ 635 $ 1,006
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 116 112 351 337
Interest cost 72 56 207 175
Expected return on plan assets (161) (145) (484) (439)
Amortization of prior service costs (credits) 0 0 1 1
Amortization of actuarial losses (gains) 55 68 180 245
Settlement losses 233 108 340 576
Net Periodic Other Benefit Costs 315 199 595 895
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 20 27 63 98
Interest cost 33 35 104 104
Expected return on plan assets (43) (42) (135) (131)
Amortization of prior service costs (credits) 2 2 5 6
Amortization of actuarial losses (gains) 4 11 12 35
Settlement losses 0 (1) (9) (1)
Net Periodic Other Benefit Costs 16 32 40 111
Other Benefits        
Net Periodic Benefit Cost        
Service cost 11 11 32 32
Interest cost 14 15 45 41
Amortization of prior service costs (credits) (7) (7) (20) (20)
Amortization of actuarial losses (gains) 4 3 10 11
Net Periodic Other Benefit Costs $ 22 $ 22 $ 67 $ 64