Derivatives (Outstanding Derivatives Entered Into to Hedge Inventory or Fixed Price Purchase Commitments) (Details) gal in Thousands, bbl in Thousands, T in Thousands	12 Months Ended
	Dec. 31, 2023 MMBTU T $ / bbl $ / MMBTU $ / gal $ / units $ / T bbl gal
Sell (Short) Contracts | Designated as hedges under accounting rules | Futures | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	234
Weighted average contract price | $ / bbl	74.71
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	8
Weighted average contract price | $ / bbl	74.89
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU	210,000
Weighted average contract price | $ / MMBTU	2.54
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Fuel
Derivative [Line Items]
Contract volumes (MT) | T	0
Weighted average contract price (MT) | $ / T	0
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Swap | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU	0
Weighted average contract price | $ / bbl	0
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Options | Natural Gas
Derivative [Line Items]
Contract volumes (bbls)	6
Weighted average contract price | $ / MMBTU	0.75
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Commodity Option | Natural Gas and Natural Gas Liquids
Derivative [Line Items]
Contract volumes (bbls) | gal	0
Weighted average contract price | $ / gal	0
Buy (Long) Contracts | Designated as hedges under accounting rules | Futures | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	29
Weighted average contract price | $ / bbl	74.89
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	1
Weighted average contract price | $ / bbl	74.89
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU	1,344,000
Weighted average contract price | $ / MMBTU	3.58
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Fuel
Derivative [Line Items]
Contract volumes (MT) | T	62
Weighted average contract price (MT) | $ / T	537.45
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Swap | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU	1,323,000
Weighted average contract price | $ / units	0.56
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Options | Natural Gas
Derivative [Line Items]
Contract volumes (bbls)	3
Weighted average contract price | $ / MMBTU	0.02
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Commodity Option | Natural Gas and Natural Gas Liquids
Derivative [Line Items]
Contract volumes (bbls) | gal	2,750
Weighted average contract price | $ / gal	0.33