Derivative instruments effect on the Company's consolidated statement of operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net	$ (7)	$ 11	$ 0
Gain (loss) on derivative instruments, net [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivatives, Gain (Loss) [Line Items]
Loss reclassified from accumulated other comprehensive loss into earnings	(19)	(27)	0
Gain (loss) on derivative instruments, net	(7)	11	0
Interest Expense [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivatives, Gain (Loss) [Line Items]
Loss reclassified from accumulated other comprehensive loss into earnings	0	(10)	(36)
Not Designated as Hedging Instrument [Member] \| Gain (loss) on derivative instruments, net [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivatives, Gain (Loss) [Line Items]
Change in fair value of interest rate derivative instruments not designated as cash flow hedges	$ 12	$ 38	$ 0

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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