Fair Value (Nonrecurring Measurements) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Asset Impairment Charges	$ 20,000,000	$ 1,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(12,000,000)	81,000,000	$ 17,000,000	$ 101,000,000
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(69,000,000)	(13,000,000)	$ (47,000,000)	$ (1,000,000)
Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	7,000,000
Commodity Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(76,000,000)
Jordan (IPP1 & IPP4)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Selling Expense	5,000,000
Weighted Average [Member] | Commodity | United States of America, Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices	63.35
Maximum [Member] | Commodity | United States of America, Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices	112.11
Minimum [Member] | Commodity | United States of America, Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Commodity prices	21
Long Lived Assets Held And Used [Member] | Jordan (IPP1 & IPP4)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Asset Impairment Charges	$ 14,000,000	0
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Jordan (IPP1 & IPP4)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		179,000,000
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Jordan (IPP1 & IPP4) | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		0
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Jordan (IPP1 & IPP4) | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		170,000,000
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Jordan (IPP1 & IPP4) | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Carrying Amount Disclosure Nonrecurring		$ 0