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Derivative Assets And Liabilities (Outstanding Commodity-Related Derivatives) (Details) | Dec. 31, 2019 MW barrels BBtu MB_bls bushels | Dec. 31, 2018 MW MMbtu barrels BBtu bushels
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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 |  | (9,265) |
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (3,085) | (1,068)
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (18,923) | (30,228)
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (13,364) | (123,254)
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount | [1] | (35,208) |
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (31,780) | (17,445)
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (31,780) | (17,445)
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | (54,158)
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (1,483) | (468)
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount | [1] |  | (16,845)
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 0 | (10,000)
Natural Gas [Member] | Long [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (31,780) | (17,445)
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | (2,704,330) |
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | (353,527) |
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  |  | (284,800)
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | (3,213,450) | (3,141,520)
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  |  | (56,656)
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | (51,615) | (18,400)
Natural Gas Liquids [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (1,300) | (2,135)
Refined Products [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (2,473) | (1,403)
Corn [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | bushels |  | (1,210) | (1,920)
Crude Oil [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | barrels |  | (4,465) | (20,888)
[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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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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