CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY - Business Acquisition, Acquiree [Domain] - 6 months ended Jun. 30, 2015 - USD ($) shares in Millions, $ in Millions	Limited Partners Common units ATM Equity Issuance Program	Limited Partners Common units	Limited Partners Class B units Unit issuances	Limited Partners Class B units	General Partner ATM Equity Issuance Program	General Partner	Accumulated Other Comprehensive Loss		Non-controlling interests	ATM Equity Issuance Program	Unit issuances	Total
Balance as of beginning year at Dec. 31, 2014		$ 1,325				$ 29	$ (2)		$ 234			$ 1,586
Partners' Equity at beginning of year (in units) at Dec. 31, 2014		63.6
Increase (Decrease) in Partners' Equity
Net income		$ 98				3			7			108
Other comprehensive loss							(1)					(1)
Equity issuance, net (Note 7); Unit Issuances (Note 6)	$ 25		$ 95		$ 1					$ 26	$ 95
Equity issuance (Note 7); Unit issuances (Note 6) (in units)	0.4		1.9
Acquisition of the remaining 30 percent interest in GTN (Note 6)		(124)				(3)			(232)			(359)
Equity contribution (Note 6)						2						2
Distributions paid		(107)				(3)			$ (9)			(119)
Balance as of end year at Jun. 30, 2015		$ 1,217		$ 95		$ 29	$ (3)	[1]				$ 1,338
Partners' Equity at End of Year (in units) at Jun. 30, 2015		64.0		1.9

[1] Losses related to cash flow hedges reported in Accumulated Other Comprehensive Loss and expected to be reclassified to Net Income in the next 12 months are estimated to be $1 million. These estimates assume constant interest rates over time; however, the amounts reclassified will vary based on actual value of interest rates at the date of settlement.