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Derivative Assets And Liabilities (Outstanding Commodity-Related Derivatives) (Details) | 12 Months Ended
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Dec. 31, 2016 barrels MMbtu Megawatt bushels | Dec. 31, 2015 barrels MMbtu Megawatt bushels
Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  |
Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  |
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (5,662,500) |
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (52,652,500) | (14,380,000)
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2018 | 2018
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2017 | 2016
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | (6,522,500)
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (22,492,489) |
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (682,500) | (602,500)
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Fixed Swaps/Futures [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount | [1] |  | (31,240,000)
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Short [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Short [Member] | Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Fixed Swaps/Futures [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (36,370,000) | (37,555,000)
Term Of Commodity Derivatives |  | 2017 | 2016
Short [Member] | Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (36,370,000) | (37,555,000)
Term Of Commodity Derivatives |  | 2017 | 2016
Short [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  |  | (109,791)
Term Of Commodity Derivatives |  |  | 2016
Short [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  | (50,400) |
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | WTI Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | barrels |  | (617,000) | (591,000)
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | WTI Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Short [Member] | WTI Crude Oil [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Short [Member] | Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | barrels |  | (5,786,627) | (8,146,800)
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2018
Short [Member] | Natural Gas Liquids [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Swaps [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Short [Member] | Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | barrels |  | (3,144,000) | (1,289,000)
Term Of Commodity Derivatives |  | 2017 |
Short [Member] | Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Short [Member] | Refined Products [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | (71,340,000)
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Swing Swaps IFERC [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (10,750,000) |
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2018 | 2017
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Basis Swaps IFERC NYMEX [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2017 | 2016
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  |  | (21,922,484)
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2017
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Forward Physical Contracts [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  |  | 2016
Long [Member] | Natural Gas [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Basis Swaps IFERC NYMEX [Member] |  |  |
Derivative, Nonmonetary Notional Amount | [1] | (2,242,500) |
Term Of Commodity Derivatives |  | 2017 |
Long [Member] | Natural Gas [Member] | Fair Value Hedging [Member] | Non Trading [Member] | Hedged Item - Inventory (MMBtu) [Member] |  |  |
Derivative, Nonmonetary Notional Amount |  | (36,370,000) | (37,555,000)
Term Of Commodity Derivatives |  | 2017 | 2016
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Calls [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  | (186,400) | (1,300,647)
Term Of Commodity Derivatives |  | 2017 | 2016
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  | (109,564) |
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2018 |
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Future [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2017 |
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Options - Puts [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  |  | (260,534)
Term Of Commodity Derivatives |  |  | 2016
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] |  |  |
Derivative, Nonmonetary Notional Amount | Megawatt |  | (391,880) | (357,092)
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Maximum [Member] |  |  |
Term Of Commodity Derivatives |  | 2018 | 2017
Long [Member] | Power [Member] | Mark-To-Market Derivatives [Member] | Trading [Member] | Forwards Swaps [Member] | Minimum [Member] |  |  |
Term Of Commodity Derivatives |  | 2017 | 2016
Long [Member] | Corn [Member] | Mark-To-Market Derivatives [Member] | Non Trading [Member] | Future [Member] |  |  |
Derivative, Nonmonetary Notional Amount | bushels |  | (1,580,000) | (1,185,000)
Term Of Commodity Derivatives |  | 2017 | 2016
[1] | (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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