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Risk Management And Financial Instruments - Realized and Unrealized Gains and Losses Recognized In Consolidated Statement of Operations (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate contracts not designated as instrument hedging	$ 0	$ 18,000,000
Gain / (loss) on derivative financial instruments	(4,000,000)	7,000,000
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate contracts not designated as instrument hedging	(1,000,000)	(18,000,000)
Cross Currency Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate contracts not designated as instrument hedging	0	29,000,000
Foreign Currency Forwards [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate contracts not designated as instrument hedging	0	1,000,000
Interest Rate Cap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (loss) on derivative financial instruments	(7,000,000)
Convertible Loan Agreement [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain / (loss) on derivative financial instruments	$ 4,000,000	$ (5,000,000)

X

- Definition

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

+ References

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=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated 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
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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