Interest Rate Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Derivative Instruments
Interest Rate Derivatives [Abstract]
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net	$ (1)	$ (1)	$ (1)
Natural Gas Commodity Contract | Other Derivative Instruments
Interest Rate Derivatives [Abstract]
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net	(1)	$ (1)	$ (1)
Cash Flow Hedges
Interest Rate Derivatives [Abstract]
Derivative Instruments in Hedges, at Fair Value, Net	$ 0