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Retirement Benefits (Schedule of Accumulated Other Comprehensive Income to be Amortized into Net Periodic Benefit Cost in Next Fiscal Year) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
United States  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss $ 1
Total 1
Int’l  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial loss 20
Total $ 20