CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME
Net income	$ 45	$ 42	[1]	$ 112	$ 95	[1]
Other comprehensive income
Change in fair value of cash flow hedges (Note 10)	(1)			(1)
Reclassification to net income of gains and losses on cash flow hedges (Note 10)
Comprehensive income	44	42	[1]	111	95	[1]
Comprehensive income attributable to non-controlling interests	8	8	[1]	18	17	[1]
Comprehensive income attributable to controlling interests	$ 36	$ 34	[1]	$ 93	$ 78	[1]

[1] (a) Recast as discussed in Note 2.