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Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 MB_bls Megawatt BBtu bushels | Dec. 31, 2017 barrels Megawatt BBtu bbl bushels
Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 | 2020
Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2019
Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2020
Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2018
Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2018
Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Long [Member] |  |  |
Notional Volume |  | (6,600) | (4,650)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Long [Member] |  |  |
Notional Volume |  | (52,413) | (87,253)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Notional Volume |  |  | (4,390)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member] |  |  |
Notional Volume |  | (5,460) |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Short [Member] |  |  |
Notional Volume |  | (174,465) | (145,105)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Long [Member] |  |  |
Notional Volume | [1] | (102,328) | (48,510)
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Long [Member] |  |  |
Notional Volume |  | (465) | (1,078)
Maximum Term Of Commodity Derivatives |  | 2018 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Short [Member] |  |  |
Notional Volume |  | (3,043) |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Long [Member] |  |  |
Notional Volume |  |  | (13,000)
Maximum Term Of Commodity Derivatives |  |  | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2020 |
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Basis Swaps IFERC/NYMEX [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC/NYMEX [Member] | Short [Member] |  |  |
Notional Volume |  | (21,475) | (39,770)
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Short [Member] |  |  |
Notional Volume |  | (21,475) | (39,770)
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] | Long [Member] |  |  |
Notional Volume |  | (21,475) | (39,770)
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
NGL [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Short [Member] |  |  |
Notional Volume |  | (1,590) | (2,493)
NGL [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
NGL [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] | Short [Member] |  |  |
Notional Volume | Megawatt |  | (30,532) | (153,600)
Maximum Term Of Commodity Derivatives |  |  | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Call Option [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (996,172) | (137,600)
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume | Megawatt |  | (3,196,100) | (435,960)
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | Megawatt |  | (42,768) | (25,760)
Power [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  |
Power [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  |
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forwards Swaps [Member] | Long [Member] |  |  |
Notional Volume |  | (44,335) | (9,237)
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Forwards Swaps [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume |  | (776) | (3,901)
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2021 |
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  |  | 2018
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Short [Member] |  |  |
Notional Volume | bushels |  | (3,320) |
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Long [Member] |  |  |
Notional Volume | bushels |  |  | (1,870)
Corn [Member] | Mark-To-Market Derivatives [Member] | Maximum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2019 |
Corn [Member] | Mark-To-Market Derivatives [Member] | Minimum [Member] | Non Trading [Member] | Future [Member] |  |  |
Maximum Term Of Commodity Derivatives |  | 2018 |
[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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