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Pension and Other Post-Employment Benefits (Defined Periodic Pension And OPEB Expense) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 2 $ 2
Interest Cost 7 5
Expected Return on Plan Assets $ (4) $ (4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Amortization of net actuarial (gains) and losses $ (6) $ (5)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Total Net Defined Periodic Benefit Cost $ (1) $ (2)
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0 0
Interest Cost $ 5 $ 4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Expected Return on Plan Assets $ (4) $ (4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Amortization of net actuarial (gains) and losses $ 0 $ 0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Total Net Defined Periodic Benefit Cost $ 1 $ 0
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 2 2
Interest Cost $ 2 $ 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Expected Return on Plan Assets $ 0 $ 0
Amortization of net actuarial (gains) and losses $ (6) $ (5)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Total Net Defined Periodic Benefit Cost $ (2) $ (2)