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Pension and Other Post-Employment Benefits (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement (Benefit) Expense $ 17 $ 15
Operating Expense [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement (Benefit) Expense 16 15
Administrative Expense [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement (Benefit) Expense 4 4
Other Nonoperating Income (Expense) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension and Other Postretirement (Benefit) Expense $ (3) $ (4)