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Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details)		Sep. 30, 2021 MMbtu Megawatt barrels bbl	Dec. 31, 2020 MMbtu Megawatt bbl barrels
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount | bbl			5,840
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | bbl		2,785
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		8,893	29,173
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		48,675
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount			11,208
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		45,588	53,575
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		10,071	11,861
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount	[1]	81,963	44,225
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount		475	1,603
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		21,255	30,113
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount		21,255	30,113
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount		21,255	30,113
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | Megawatt		290,400
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | Megawatt		36,704	2,343,293
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | Megawatt		712,400	1,392,400
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount | Megawatt		640,800
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | Megawatt			18,706
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | Megawatt			519,071
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Long [Member]
Derivative, Nonmonetary Notional Amount | bbl		1,693	0
Refined product sales | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member]
Derivative, Nonmonetary Notional Amount | barrels		3,272	2,765
[1] Includes aggregate amounts for open positions related to Houston Ship Channel, Waha Hub, NGPL TexOk, West Louisiana Zone and Henry Hub locations.

X

- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=123477628&loc=d3e90205-114008

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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