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Retirement Benefits (Schedule of Amounts Recognized on Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
United States    
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 0 $ 0
Pension obligations (8) (16)
Int’l    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 1 0
Pension obligations $ (80) $ (365)