Acquisitions and Divestitures (2013 Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended			1 Months Ended						3 Months Ended					1 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2013 SUGS Contribution [Member]	Apr. 30, 2013 Holdco Transaction [Member]	Apr. 30, 2013 Holdco Transaction [Member] Common Units [Member]	Sep. 30, 2013 Missouri Gas Energy [Member]	Dec. 31, 2013 New England Gas Company [Member]	Dec. 31, 2013 AmeriGas [Member]	Jun. 30, 2012 AmeriGas [Member] Propane Cylinder Exchange Business [Member]	Oct. 05, 2012 ETP [Member]	Dec. 31, 2013 ETP [Member] Holdco Transaction [Member]	Oct. 05, 2012 Parent Company [Member]	Apr. 30, 2013 Parent Company [Member] Holdco Transaction [Member]	Apr. 30, 2013 Common Units [Member] Regency [Member] SUGS Contribution [Member]	Apr. 30, 2013 Class F Units [Member] Regency [Member] SUGS Contribution [Member]	Feb. 28, 2014 Trunkline LNG Transaction [Member]
Business Acquisition [Line Items]
Senior note interest rate		4.50%
Relinquishment of Rights of Incentive Distributions, Percentage						50.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	2.2						49.5									31.4	6.3
Guarantor Obligations, Current Carrying Value		$ 600
Proceeds from Divestiture of Businesses								975	40		43
Noncash or Part Noncash Divestiture, Amount of Consideration Received									20
Business Acquisition Units Acquired										29.6
Business Combination, Consideration Transferred					463	1,400
Estimated Closing Adjustments						68
Cash (paid) received from all other acquisitions		(405)	531	(1,972)	30
Equity interest in Holdco												40.00%	100.00%	60.00%	60.00%
Partners' Capital Account, Units, Redeemed																		18.7
Related Party Transaction, Expenses from Transactions with Related Party																		$ 75