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Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 MMbtu barrels Megawatt bbl bushels | Dec. 31, 2018 MMbtu barrels Megawatt bbl bushels
Maximum Term Of Commodity Derivatives |  | 2019 |
Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | bushels |  | (2,070) |
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Short [Member] |  |  |
Notional Volume | bbl |  | (857) | (2,135)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member] |  |  |
Notional Volume |  | (18,250) | (30,228)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Long [Member] |  |  |
Notional Volume |  | (39,685) | (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 |  | (80) |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Short [Member] |  |  |
Notional Volume |  | (27,096) | (123,254)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Long [Member] |  |  |
Notional Volume | [1] | (2,595) | (16,845)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member] |  |  |
Notional Volume |  | (610) | (468)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Long [Member] |  |  |
Notional Volume |  | (10,000) |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] | Long [Member] |  |  |
Notional Volume |  |  | (10,000)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2022 | 2021
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 | 2021
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member] |  |  |
Notional Volume |  | (30,958) | (17,445)
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Notional Volume |  | (30,958) | (17,445)
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] | Long [Member] |  |  |
Notional Volume |  | (30,958) | (17,445)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Short [Member] |  |  |
Notional Volume | Megawatt |  | (144,611) |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (391,740) | (284,800)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (2,554,800) | (3,141,520)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (14,776) | (56,656)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  |  | (18,400)
Power [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 |
Power [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 | 2021
Power [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Put Option [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 |
Power [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Power [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Put Option [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume | bbl |  | (13,832) | (20,888)
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  |
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  |
NGL [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 |
NGL [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Refined product sales | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Refined product sales | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | barrels |  | (592) | (1,403)
Refined product sales | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 |
Refined product sales | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
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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