CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY (USD $) In Millions, unless otherwise specified	Total		Common Units	General Partner	Accumulated Other Comprehensive Loss
Partners' equity at Dec. 31, 2011	$ 1,333		$ 1,307	$ 27	$ (1)
Partners' equity (in units) at Dec. 31, 2011	53.5		53.5
Increase (Decrease) in Partners' Equity
Net income	72	[1]	70	2
Distributions paid	(84)		(82)	(2)
Partners' equity at Jun. 30, 2012	$ 1,321		$ 1,295	$ 27	$ (1)
Partners' equity (in units) at Jun. 30, 2012	53.5		53.5

[1] 25 percent interests in each of GTN and Bison were acquired in May 2011.