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Retirement Benefits (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer     $ 24  
Estimated future employer contributions in next fiscal year $ 50   50  
United States        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 $ 0 1 $ 1
Expected return on plan assets (1) (1) (2) (2)
Amortization of prior service cost 0 0 0 0
Recognized actuarial loss 0 1 1 1
Net periodic pension cost (benefit) 0 0 0 0
Int’l        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 8 9 16 19
Expected return on plan assets (22) (14) (43) (29)
Amortization of prior service cost 1 1 1 1
Recognized actuarial loss 8 5 16 11
Net periodic pension cost (benefit) $ (5) $ 1 $ (10) $ 2