CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	[1]	Jun. 30, 2017		Jun. 30, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 55	$ 57		$ 138	[2]	$ 138	[1]
Other comprehensive income
Change in fair value of cash flow hedges (Note 12)		(1)		1		(3)
Amortization of realized loss on derivative financial instruments (Note 12)	1	1		1		1	[1]
Reclassification to net income of gains and losses on cash flow hedges (Note 12)	(1)			(1)
Comprehensive income	55	57		139		136
Comprehensive income attributable to non-controlling interests		2		6		8
Comprehensive income attributable to controlling interests	$ 55	$ 55		$ 133		$ 128

[1] Recast to consolidate PNGTS for all periods presented (Refer to Notes 2 and 6).

[2] Recast to consolidate PNGTS for all periods presented. See Notes 2 and 6.