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Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 2 2 3
Expected return on plan assets (3) (3) (3)
Prior service cost amortization 0 0 0
Recognized actuarial loss 2 2 2
Net periodic benefit cost 1 1 2
Int’l      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3 2 2
Interest cost 33 39 50
Expected return on plan assets (87) (59) (77)
Prior service cost amortization 1 1 1
Recognized actuarial loss 31 22 16
Net periodic benefit cost $ (19) $ 5 $ (8)