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Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details) | Sep. 30, 2019 MMbtu barrels bbl Megawatt bushels | Dec. 31, 2018 MMbtu barrels bbl Megawatt bushels
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Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | bushels |  | (1,760) |
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Short [Member] |  |  |
Notional Volume | bbl |  | (9,687) | (2,135)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member] |  |  |
Notional Volume |  | (23,653) | (30,228)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Long [Member] |  |  |
Notional Volume |  | (22,365) | (54,158)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Notional Volume |  |  | (1,068)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member] |  |  |
Notional Volume |  | (2,323) |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Short [Member] |  |  |
Notional Volume |  | (29,492) | (123,254)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Long [Member] |  |  |
Notional Volume | [1] | (20,563) | (16,845)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member] |  |  |
Notional Volume |  | (1,723) | (468)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Long [Member] |  |  |
Notional Volume |  | 0 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] | Long [Member] |  |  |
Notional Volume |  |  | (10,000)
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member] |  |  |
Notional Volume |  | (31,703) | (17,445)
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Notional Volume |  | (31,703) | (17,445)
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] | Long [Member] |  |  |
Notional Volume |  | (31,703) | (17,445)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (515,317) |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] | Short [Member] |  |  |
Notional Volume | Megawatt |  | (756,153) |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  |  | (284,800)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (2,847,350) | (3,141,520)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (222,440) | (56,656)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  |  | (18,400)
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume | bbl |  | (9,510) | (20,888)
Refined product sales | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | barrels |  | (906) | (1,403)
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | bushels |  |  | (1,920)
[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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