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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 1 $ 1 $ 1 $ 1
Interest cost 1 1 2 2
Expected return on plan assets 0 0 0 0
Amortization of prior service credit (10) (10) (20) (19)
Recognized net actuarial loss 0 1 0 1
Settlements 0 0 0 0
Curtailments     0 0
Special Termination Benefits     0 0
Net periodic benefit cost (8) (7) (17) (15)
United States | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 16 18 32 39
Interest cost 12 15 24 28
Expected return on plan assets (13) (20) (26) (44)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 5 12 11 27
Settlements 18 42 22 44
Curtailments     0 12
Special Termination Benefits     0 9
Net periodic benefit cost 38 67 63 115
Int'l. | Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 13 16 26 31
Interest cost 21 20 42 40
Expected return on plan assets (34) (30) (68) (60)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 2 8 4 16
Settlements 0 0 0 0
Curtailments     0 0
Special Termination Benefits     0 0
Net periodic benefit cost $ 2 $ 14 $ 4 $ 27