(Schedule of Notional Amounts of Financial Instruments) (Details) $ in Millions		12 Months Ended
		Dec. 31, 2021 USD ($) MWh	Dec. 31, 2020 USD ($) MWh
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, notional amount | $	[1]	$ 0	$ 3
Not Designated as Hedging Instrument [Member] | Energy Commodities and Service | Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh		500,000	200,000

[1] These contracts had maturities of two years or less as of December 31, 2021.