Accounting for Derivative Instruments and Hedging Activities Derivative instruments effect on the Company's condensed consolidated statements of operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative instruments, Gain (Loss) [Line Items]
Loss on derivative instruments, net	$ (6)	$ (2)
Gain (loss) on derivative instruments, net [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative instruments, Gain (Loss) [Line Items]
Loss reclassified from accumulated other comprehensive loss into earnings	(3)	(6)
Not Designated as Hedging Instrument [Member] | Gain (loss) on derivative instruments, net [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative instruments, Gain (Loss) [Line Items]
Change in fair value of interest rate derivative instruments not designated as cash flow hedges	(3)	4
Loss on derivative instruments, net	$ (6)	$ (2)