Mergers, Deconsolidations and Related Transactions (Narrative) (Details) (USD $) In Millions, unless otherwise specified												1 Months Ended	12 Months Ended	1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Regency [Member]	Mar. 31, 2014 ETP	Feb. 19, 2014 ETP	Mar. 31, 2014 7.60% Senior Notes, due February 1, 2024 [Member]	Jan. 10, 2014 7.60% Senior Notes, due February 1, 2024 [Member]	Mar. 31, 2014 8.25% Senior Notes, due November 14, 2029 [Member]	Jan. 10, 2014 8.25% Senior Notes, due November 14, 2029 [Member]	Mar. 31, 2014 Regency 4.50% Senior Notes Due 2023 [Member]	Mar. 31, 2014 Class F Units [Member] Regency [Member]	Dec. 31, 2013 New England Gas Company [Member]	Dec. 31, 2013 Missouri Gas Energy [Member]	Apr. 30, 2013 SUGS Contribution [Member]	Feb. 28, 2014 Trunkline LNG Transaction [Member]	Feb. 19, 2014 Trunkline LNG Transaction [Member]
Business Acquisition
Debt Instrument, Interest Rate, Stated Percentage						7.60%	7.60%	8.25%	8.25%	4.50%
Number of common units of a subsidiary partnership that are held by a less than wholly-owned subsidiary of the Parent.			31.4								6.3
Number of common units of a subsidiary partnership that are held by a wholly-owned subsidiary of the Parent.				2.2
Guarantor Obligations, Current Carrying Value										$ 600
NOTE PAYABLE TO RELATED PARTY	0	1,090			1,090
Partners' Capital Account, Units, Redeemed															18.7
Goodwill	1,152	1,336														184
Impairment of Intangible Assets (Excluding Goodwill)																50
Proceeds from Divestiture of Businesses												40	975
Noncash or Part Noncash Divestiture, Amount of Consideration Received												20
Business Combination, Consideration Transferred														463
Cash Acquired from Acquisition														$ 30