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Derivative Assets And Liabilities (Outstanding Commodity-Related Derivatives) (Details) | 12 Months Ended
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Dec. 31, 2018 barrels MB_bls MW BBtu bushels | Dec. 31, 2017 barrels MMbtu MW BBtu bushels
Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2020 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2021 | 2019
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2021 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2020 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2020 | 2020
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 1,068 | 4,390
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 30,228 |
Natural Gas [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 123,254 | 145,105
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 17,445 | 39,770
Natural Gas [Member] | Short [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 17,445 | 39,770
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 54,158 | 87,253
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | 4,650
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 468 | 1,078
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount | [1] | 16,845 | 48,510
Natural Gas [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 10,000 | 13,000
Natural Gas [Member] | Long [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 17,445 | 39,770
Power [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forward Swaps [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2019
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forward Swaps [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2021 |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  |  | 25,760
Power [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Put Option [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  |  | 153,600
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | 284,800 | 137,600
Power [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | MW |  | 3,141,520 | 435,960
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 |  | 18,400 |
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2019
Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Natural Gas Liquids [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 2,135 | 2,493
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2019
Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Refined Products [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | 1,403 | 3,901
Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 | 2018
Corn [Member] | Short [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | bushels |  | 1,920 |
Corn [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | bushels |  |  | 1,870
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Term Of Commodity Derivatives |  | 2019 |
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2019
Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Crude Oil [Member] | Long [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | barrels |  | 20,888 | 9,237
[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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