Price Risk Management Assets And Liabilities Interest Rate Swaps Outstanding (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Fixed Interest Rate Of 4.02% [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	July 2013	[1]
Fixed rate	4.03%
Fixed Interest Rate Of 4.26 Percent [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	July 2014	[1]
Fixed rate	4.25%
Floating Interest Rate Of 6.70% [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	July 2018
Fixed rate	6.70%
Floating Interest Rate of 4.65 Percent [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	June 2021
Fixed rate	4.65%
Floating Interest Rate Of 3.60 Percent [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	February 2023
Fixed rate	3.60%
Fixed Rate of 2.91 Percent [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	November 2016
Spread on floating rate	2.97%
Fixed Rate of 3.75 Percent [Member] | Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member]
Term	November 2021
Spread on floating rate	3.75%
July 2013 [Member] | Interest Rate Derivatives [Member] | ETP [Member]
Notional Amount	$ 0		$ 400
Type	Forward-starting to pay a fixed rate of 4.03% and receive a floating rate
July 2014 [Member] | Interest Rate Derivatives [Member] | ETP [Member]
Notional Amount	400		400
Type	Forward-starting to pay a fixed rate of 4.25% and receive a floating rate
July 2018 [Member] | Interest Rate Derivatives [Member] | ETP [Member]
Notional Amount	600		600
Type	Pay a floating rate plus a spread of 4.17% and receive a fixed rate of 6.70%
June 2021 [Member] | Interest Rate Derivatives [Member] | ETP [Member]
Notional Amount	200		0
Type	Pay a floating rate plus a spread of 2.15% and receive a fixed rate of 4.65%
February 2023 [Member] | Interest Rate Derivatives [Member] | ETP [Member]
Notional Amount	400		0
Type	Pay a floating rate plus a spread of 1.32% and receive a fixed rate of 3.60%
November 2016 [Member] | Interest Rate Derivatives [Member] | Southern Union [Member]
Notional Amount	25		75
Type	Pay a fixed rate of 2.97% and receive a floating rate
November 2021 [Member] | Interest Rate Derivatives [Member] | Southern Union [Member]
Notional Amount	$ 450		$ 450
Type	Pay a fixed rate of 3.75% and receive a floating rate

[1] Represents the effective date. These forward starting swaps have a term of 10 years with a mandatory termination date the same as the effective date.