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Employee Benefits - Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Benefits        
Net Periodic Benefit Cost        
Net Periodic Other Benefit Costs $ 179 $ 331 $ 427 $ 635
Pension Benefits | United States        
Net Periodic Benefit Cost        
Service cost 86 116 257 351
Interest cost 112 72 336 207
Expected return on plan assets (140) (161) (419) (484)
Amortization of prior service costs (credits) 1 0 3 1
Amortization of actuarial losses (gains) 51 55 152 180
Settlement losses 53 233 53 340
Net Periodic Other Benefit Costs 163 315 382 595
Pension Benefits | International        
Net Periodic Benefit Cost        
Service cost 15 20 44 63
Interest cost 49 33 145 104
Expected return on plan assets (52) (43) (154) (135)
Amortization of prior service costs (credits) 2 2 6 5
Amortization of actuarial losses (gains) 2 4 6 12
Settlement losses 0 0 0 (9)
Acquisitions / (divestitures) 0 0 (2) 0
Net Periodic Other Benefit Costs 16 16 45 40
Other Benefits        
Net Periodic Benefit Cost        
Service cost 9 11 25 32
Interest cost 23 14 72 45
Amortization of prior service costs (credits) (6) (7) (19) (20)
Amortization of actuarial losses (gains) (5) 4 (14) 10
Net Periodic Other Benefit Costs $ 21 $ 22 $ 64 $ 67