Noncurrent Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Other Liabilities, Noncurrent [Abstract]

Schedule of Noncurrent Other Liabilities

	As of December 31,
	2015	2014
	(In $ millions)
Asset retirement obligations	26	28
Deferred proceeds	43	47
Deferred revenue	13	21
Derivatives (Note 22)	—	10
Environmental (Note 16)	61	63
Income taxes payable	7	13
Insurance	50	51
Other	47	50
Total	247	283

Schedule of Changes in Asset Retirement Obligations

Changes in asset retirement obligations are as follows:

	Year Ended December 31,
	2015		2014		2013
	(In $ millions)
Balance at beginning of year	37		47		64
Additions(1)	—		4		5
Accretion	1		1		2
Payments	(4	)	(8	)	(23	)
Revisions to cash flow estimates(2)	2		(7	)	(2	)
Exchange rate changes	—		—		1
Balance at end of year	36		37		47

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⁽¹⁾  Primarily relates to sites which management no longer considers to have an indeterminate life.

⁽²⁾  Primarily relates to revisions to the estimated cost and timing of future obligations.