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Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details)		3 Months Ended	12 Months Ended
		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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+ References

No definition available.

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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