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Derivative Assets And Liabilities Outstanding Commodity Derivatives (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2017
MMbtu
barrels
Megawatt
bbl
Dec. 31, 2016
MMbtu
barrels
Megawatt
bbl
WTI Crude Oil [Member] | Future [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
WTI Crude Oil [Member] | Future [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume | bbl 160,000 617,000
Natural Gas Liquids [Member] | Forwards Swaps [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Natural Gas Liquids [Member] | Forwards Swaps [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume | bbl 4,647,000 5,786,627
Power [Member] | Forwards Swaps [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume | Megawatt 665,040 391,880
Power [Member] | Forwards Swaps [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Power [Member] | Forwards Swaps [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018 2018
Power [Member] | Options - Calls [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Power [Member] | Options - Calls [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume | Megawatt 545,600 186,400
Power [Member] | Options - Calls [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Power [Member] | Options - Calls [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018  
Power [Member] | Future [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume | Megawatt 213,840  
Power [Member] | Future [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume | Megawatt   109,564
Power [Member] | Future [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Power [Member] | Future [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018 2018
Power [Member] | Options - Puts [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Power [Member] | Options - Puts [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume | Megawatt 280,800 50,400
Power [Member] | Options - Puts [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Power [Member] | Options - Puts [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018  
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume 20,220,000 52,652,500
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member] | Short [Member]    
Notional Volume 41,102,500 36,370,000
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume   682,500
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume 1,297,500  
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Minimum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Maximum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2019 2019
Natural Gas [Member] | Fixed Swaps/Futures [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018  
Natural Gas [Member] | Forward Physical Swaps [Member] | Minimum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Natural Gas [Member] | Forward Physical Swaps [Member] | Maximum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018  
Natural Gas [Member] | Forward Physical Contracts [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Natural Gas [Member] | Forward Physical Contracts [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume 140,937,993 22,492,489
Natural Gas [Member] | Hedged Item - Inventory (MMBtu) [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Natural Gas [Member] | Hedged Item - Inventory (MMBtu) [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member] | Long [Member]    
Notional Volume 41,102,500 36,370,000
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume 67,500 10,750,000
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Non Trading [Member] | Fair Value Hedging Derivatives [Member] | Short [Member]    
Notional Volume 41,102,500 36,370,000
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives [1]   2017
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume [1] 15,810,000  
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume [1]   2,242,500
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Minimum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017 2017
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Maximum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2020 2018
Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2019  
Natural Gas [Member] | Swing Swaps IFERC [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Natural Gas [Member] | Swing Swaps IFERC [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume   5,662,500
Natural Gas [Member] | Swing Swaps IFERC [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume 91,897,500  
Natural Gas [Member] | Swing Swaps IFERC [Member] | Minimum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Natural Gas [Member] | Swing Swaps IFERC [Member] | Maximum [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2019  
Natural Gas [Member] | Options - Puts [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2018  
Natural Gas [Member] | Options - Puts [Member] | Trading [Member] | Mark-To-Market Derivatives [Member] | Long [Member]    
Notional Volume 13,000,000 0
Natural Gas [Member] | Options - Puts [Member] | Minimum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2017  
Natural Gas [Member] | Options - Puts [Member] | Maximum [Member] | Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives 2019  
Refined Products [Member] | Future [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member]    
Term Of Commodity Derivatives   2017
Refined Products [Member] | Future [Member] | Non Trading [Member] | Mark-To-Market Derivatives [Member] | Short [Member]    
Notional Volume | barrels 0 2,240,000
[1] Includes aggregate amounts for open positions related to Houston Ship Channel, Waha Hub, NGPL TexOk, West Louisiana Zone and Henry Hub locations.