Noncurrent Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

Other Liabilities, Noncurrent [Abstract]

Schedule of Noncurrent Other Liabilities

	As of December 31,
	2016	2015
	(In $ millions)
Asset retirement obligations	20	26
Deferred proceeds	41	43
Deferred revenue	9	13
Environmental (Note 16)	50	61
Income taxes payable	6	7
Insurance	46	50
Other	43	47
Total	215	247

Schedule of Changes in Asset Retirement Obligations

Changes in asset retirement obligations are as follows:

	Year Ended December 31,
	2016		2015		2014
	(In $ millions)
Balance at beginning of year	36		37		47
Additions(1)	2		—		4
Accretion	1		1		1
Payments	(10	)	(4	)	(8	)
Revisions to cash flow estimates(2)	—		2		(7	)
Exchange rate changes	—		—		—
Balance at end of year	29		36		37

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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.