CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY - 9 months ended Sep. 30, 2016 - USD ($) shares in Millions, $ in Millions	Limited Partners Common units	Limited Partners Class B units	General Partner	Accumulated Other Comprehensive Loss	[1]	Total
Partners' Equity at beginning of period at Dec. 31, 2015	$ 1,021	$ 107	$ 25	$ (2)		$ 1,151
Partners' Equity at beginning of period (in units) at Dec. 31, 2015	64.3	1.9
Increase (Decrease) in Partners' Equity
Net income	$ 164	$ 12	9			185
Other Comprehensive Loss				(1)		(1)
ATM Equity Issuance, net (Note 7)	$ 35					35
ATM Equity Issuance (Note 7) (in units)	0.7
Common unit issuance subject to rescission, net (Note 7)	$ 81		2			83
Common unit issuance subject to rescission, net (Note 7) (in units)	1.6
Reclassification of common unit issuance subject to rescission, net (Note 7)	$ (81)		(2)			(83)
Reclassification of common unit issuance subject to rescission, net (Note 7) (in units)	(1.6)
Acquisition of 49.9 percent interest in PNGTS (Note 6)	$ (72)		(1)			(73)
Distributions	(177)	(12)	(7)			(196)
Partners' Equity at end of period at Sep. 30, 2016	$ 971	$ 107	$ 26	$ (3)		$ 1,101
Partners' Equity at end of period (in units) at Sep. 30, 2016	65.0	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.