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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Other Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 0 $ 1 $ 0 $ 1
Interest cost 2 1 3 2
Expected return on plan assets 0 0 0 0
Amortization of prior service credit (10) (10) (19) (20)
Recognized net actuarial loss (gain) (1) 0 (2) 0
Settlements 0 0 0 0
Net periodic benefit cost (9) (8) (18) (17)
United States | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 13 16 26 32
Interest cost 20 12 39 24
Expected return on plan assets (14) (13) (29) (26)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss (gain) 3 5 6 11
Settlements 0 18 4 22
Net periodic benefit cost 22 38 46 63
Int'l. | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 9 13 19 26
Interest cost 29 21 57 42
Expected return on plan assets (37) (34) (74) (68)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss (gain) 17 2 34 4
Settlements 0 0 0 0
Net periodic benefit cost $ 18 $ 2 $ 36 $ 4