Commitments And Contingencies (Narrative) (Details) - USD ($)	12 Months Ended	42 Months Ended	57 Months Ended	180 Months Ended
	Dec. 31, 2019	Jul. 01, 2022	Dec. 31, 2022	Dec. 31, 2032	May 31, 2019	Apr. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Current annual salaries of officers and key employees	$ 15,000,000
South Texas divestiture
Loss Contingencies [Line Items]
Deficiency Fee Liability	(394,000,000)
Guarantor Obligations, Reimbursement	69,000,000
Guarantor Obligations, Liquidation Proceeds, Monetary Amount	325,000,000
South Texas divestiture | Forecast [Member]
Loss Contingencies [Line Items]
Loss Contingency, Obligation, Percentage		10000.00%
Loss Contingency, Buyer Recovery, Percentage		18.00%
Divestitures Obligations, Raton Transportation [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Liquidation Proceeds, Monetary Amount	50,000,000
Deficiency fees paid and reimbursed	12,000,000
West Eagle Ford Shale
Loss Contingencies [Line Items]
Guarantor Obligations, Liquidation Proceeds, Monetary Amount	$ 19,000,000
Maximum | South Texas divestiture
Loss Contingencies [Line Items]
Loss Contingency, Obligation, Percentage	10000.00%
Deficiency Fee Liability	$ 620,000,000
Maximum | South Texas divestiture | Forecast [Member]
Loss Contingencies [Line Items]
Loss Contingency, Obligation, Percentage		10000.00%
Loss Contingency, Buyer Recovery, Percentage		2000.00%
Maximum | Divestitures Obligations, Raton Transportation [Member]
Loss Contingencies [Line Items]
Deficiency Fee Liability	90,000,000
Maximum | Divestitures Obligations, Raton Transportation [Member] | Forecast [Member]
Loss Contingencies [Line Items]
Loss Contingency, Obligation, Percentage				10000.00%
Maximum | West Eagle Ford Shale
Loss Contingencies [Line Items]
Deficiency Fee Liability	20,000,000
Maximum | West Eagle Ford Shale | Forecast [Member]
Loss Contingencies [Line Items]
Loss Contingency, Obligation, Percentage			10000.00%
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Monetary sanctions	(188,400)
Divestitures Obligations, South Texas [Member]
Loss Contingencies [Line Items]
Deficiency Fee Liability	348,000,000					$ (49,000,000)
Divestitures Obligations, South Texas [Member] | South Texas divestiture
Loss Contingencies [Line Items]
Guarantor Obligations, Reimbursement					$ 72,000,000
Divestitures Obligations, South Texas [Member] | South Texas divestiture | Other Current Liabilities [Member]
Loss Contingencies [Line Items]
Monetary sanctions	$ (153,000,000)