Commitments And Contingencies (Schedule Of Environmental Liabilities) (Details) - Natural Gas Processing Plant [Member] $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($)
Current and non-current environmental liabilities	$ 11
IPL [Member]
Current and non-current environmental liabilities	8
Minimum [Member]
Range of estimated future costs	9
Minimum [Member] \| IPL [Member]
Range of estimated future costs	6
Maximum [Member]
Range of estimated future costs	25
Maximum [Member] \| IPL [Member]
Range of estimated future costs	$ 19

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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