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Derivative Assets And Liabilities (Outstanding Commodity-Related Derivatives) (Details) | Dec. 31, 2020 barrels MW BBtu MB_bls thousandBushels | Dec. 31, 2019 BBtu MW thousandBushels barrels MB_bls
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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 |  |  | 9,265
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 53,575 | 3,085
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 | 18,923
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 11,861 | 13,364
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | [1] | 44,225 | 35,208
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 30,113 | 31,780
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 30,113 | 31,780
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] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 1,603 | 1,483
Natural Gas [Member] | Long [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume |  | 30,113 | 31,780
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  |  | 2,704,330
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MW |  |  | 353,527
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 |  | 1,392,400 | 3,213,450
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 | 51,615
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 | 1,300
Refined Products [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | MB_bls |  | 2,765 | 2,473
Corn [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | thousandBushels |  | 0 | 1,210
Crude Oil [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount, Volume | barrels |  | 0 | 4,465
[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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