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Noncurrent Other Liabilities
 12 Months Ended
Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]  
Noncurrent Other Liabilities
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


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

______________________________
(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, 2015 and 2014 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, 2015.