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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Settlements loss (gain) $ 6 $ 37 $ 102
Pension Benefits | U.S.      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 51 58 73
Interest cost 77 62 53
Expected return on plan assets (58) (50) (80)
Amortization of prior service credit 0 0 0
Recognized net actuarial loss (gain) 12 24 43
Settlements loss (gain) 6 37 102
Curtailment loss (gain) 0 0 12
Net periodic benefit cost 88 131 203
Pension Benefits | Int’l.      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 38 47 61
Interest cost 113 77 79
Expected return on plan assets (148) (124) (120)
Amortization of prior service credit 0 (1) (1)
Recognized net actuarial loss (gain) 67 11 33
Settlements loss (gain) 0 0 0
Curtailment loss (gain) 0 0 0
Net periodic benefit cost 70 10 52
Other Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 1 1 2
Interest cost 5 4 4
Expected return on plan assets 0 0 0
Amortization of prior service credit (38) (38) (37)
Recognized net actuarial loss (gain) (3) 0 0
Settlements loss (gain) 0 0 0
Curtailment loss (gain) 0 0 0
Net periodic benefit cost $ (35) $ (33) $ (31)