Noncurrent Other Liabilities



	As of December 31,
	2014	2013
	(In $ millions)
Asset retirement obligations	28	18
Deferred proceeds	47	53
Deferred revenue	21	28
Derivatives (Note 22)	10	3
Environmental (Note 16)	63	67
Income taxes payable	13	20
Insurance	51	50
Restructuring (Note 18)	—	2
Other	50	46
Total	283	287

Changes in asset retirement obligations are as follows:



	Year Ended December 31,
	2014		2013		2012
	(In $ millions)
Balance at beginning of year	47		64		64
Additions⁽¹⁾	4		5		3
Accretion	1		2		3
Payments	(8	)	(23	)	(12	)
Revisions to cash flow estimates⁽²⁾	(7	)	(2	)	5
Exchange rate changes	—		1		1
Balance at end of year	37		47		64

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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.

Included in the asset retirement obligations for the years ended December 31, 2014 and 2013 is $10 million and $10 million, respectively, related to indemnifications received for a business acquired in 2005. The Company has a corresponding receivable of $1 million in Non-trade receivables, net and $9 million included in noncurrent Other assets in the consolidated balance sheet as of December 31, 2014.