Retirement Benefits (Schedule Of Asset Allocation) (Details)	Dec. 31, 2021
DB Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	100.00%
DB Pension Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	54.00%
DB Pension Plans | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	28.00%
DB Pension Plans | Real asset investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	12.00%
DB Pension Plans | Multi-asset investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	5.00%
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 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	55.00%
OPEB Plan | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	28.00%
OPEB Plan | Real asset investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	12.00%
OPEB Plan | Multi-asset 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%