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Retirement Benefits (Net Periodic Benefit Costs Schedule) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 2 3
Expected return on plan assets (2) (2)
Prior service cost amortization 0 0
Net periodic benefit cost 0 1
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 4 5
Expected return on plan assets (11) (11)
Prior service cost amortization 19 19
Net periodic benefit cost $ 13 $ 14