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Employee Benefits - Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension Benefits    
Net Periodic Benefit Cost    
Net Periodic Other Benefit Costs $ 101 $ 137
Pension Benefits | United States    
Net Periodic Benefit Cost    
Service cost 90 89
Interest cost 124 116
Expected return on plan assets (174) (149)
Amortization of prior service costs (credits) 1 1
Amortization of actuarial losses (gains) 30 61
Net Periodic Other Benefit Costs 71 118
Pension Benefits | International    
Net Periodic Benefit Cost    
Service cost 14 14
Interest cost 48 47
Expected return on plan assets (47) (50)
Amortization of prior service costs (credits) 3 3
Amortization of actuarial losses (gains) 12 5
Net Periodic Other Benefit Costs 30 19
Other Benefits    
Net Periodic Benefit Cost    
Service cost 7 8
Interest cost 25 25
Amortization of prior service costs (credits) (6) (6)
Amortization of actuarial losses (gains) (4) (4)
Net Periodic Other Benefit Costs $ 22 $ 23