CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 204	$ 191	[1]	$ 229	[1]
Other comprehensive income
Change in fair value of cash flow hedges (Note 18)	(1)
Reclassification to net income of gains and losses on cash flow hedges (Note 10)			[1]		[1]
Other comprehensive income	(1)
Total comprehensive income	203	191	[1]	229	[1]
Comprehensive income attributable to non-controlling interests	32	36	[1]	37	[1]
Comprehensive income attributable to controlling interests	$ 171	$ 155	[1]	$ 192	[1]

[1] Recast as discussed in Note 2 and Note 6.