Equity Method Investments (Schedule Of Equity Method Investments) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Centennial [Member]	Dec. 31, 2012 Centennial [Member]	Dec. 31, 2013 LOCAP LLC [Member]	Dec. 31, 2012 LOCAP LLC [Member]	Dec. 31, 2013 LOOP [Member]	Dec. 31, 2012 LOOP [Member]	Dec. 31, 2013 North Dakota Pipeline Class B Units [Member]		Dec. 31, 2012 North Dakota Pipeline Class B Units [Member]	Dec. 31, 2013 TAAE [Member]	Oct. 02, 2013 TAAE [Member]	Dec. 31, 2012 TAAE [Member]	Dec. 31, 2013 TACE [Member]	Dec. 31, 2012 TACE [Member]	Dec. 31, 2013 TAEI [Member]	Dec. 31, 2012 TAEI [Member]	Dec. 31, 2013 TAME [Member]		Dec. 31, 2012 TAME [Member]	Dec. 31, 2013 TAME [Member] Direct Ownership Interest [Member]		Dec. 31, 2013 Other Equity Method Investees [Member]	Dec. 31, 2012 Other Equity Method Investees [Member]	Jan. 02, 2016 North Dakota Pipeline Class A Units [Member] Scenario, Forecast [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments, Ownership Percentage			50.00%		59.00%		51.00%		38.00%	[1]		43.00%	43.00%		60.00%		34.00%		67.00%			50.00%	[2]			27.00%
Equity method investments	$ 463	$ 321	$ 29	$ 27	$ 24	$ 26	$ 214	$ 198	$ 24	[1]	$ 0	$ 29		$ 0	$ 70	$ 29	$ 23	$ 0	$ 35	[2]	$ 27			$ 15	$ 14

[1] We own a 38 percent interest in the Class B units of this entity. Our Class B units will be converted to an approximate 27 percent ownership interest in the Class A units of this entity upon completion of the Sandpiper pipeline construction project in 2016.

[2] Excludes TAEI's investment in TAME.