Retirement Benefits (Schedule of Asset Allocation) (Details)	Dec. 31, 2023
DB Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	100.00%
DB Pension Plans | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	42.00%
DB Pension Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	38.00%
DB Pension Plans | Real asset investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	9.00%
DB Pension Plans | Return-seeking fixed income
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	6.00%
DB Pension Plans | Liquid alternative investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	4.00%
DB Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	1.00%
OPEB Plan
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	100.00%
OPEB Plan | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	40.00%
OPEB Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	42.00%
OPEB Plan | Real asset investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	8.00%
OPEB Plan | Return-seeking fixed income
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	5.00%
OPEB Plan | Liquid alternative investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	4.00%
OPEB Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	1.00%