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Derivative Assets And Liabilities (Outstanding Commodity-Related Derivatives) (Details) | Dec. 31, 2021 MB_bls BBtu MW barrels | Dec. 31, 2020 BBtu MB_bls MW barrels
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Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 106,333 |
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 63,898 | 53,575
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 29,173
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 5,950 | 11,861
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | [1] | 66,665 | 44,225
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 40,533 | 30,113
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 40,533 | 30,113
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  |  | 11,208
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 6,738 |
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 585 | 1,603
Natural Gas [Member] | Long [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 40,533 | 30,113
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  | 30,932 |
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  | 604,920 |
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  | 7,859 |
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  |  | 2,343,293
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  | 653,000 | 1,392,400
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  |  | 18,706
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  |  | 519,071
Natural Gas Liquids [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MB_bls |  |  | 5,840
Natural Gas Liquids [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MB_bls |  | 8,493 |
Refined Products [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MB_bls |  | 3,349 | 2,765
Crude Oil [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | barrels |  | 3,672 | 0
[1] | Includes aggregate amounts for open positions related to Houston Ship Channel, Waha Hub, NGPL TexOk, West Louisiana Zone and Henry Hub locations.

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