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Noncurrent Other Liabilities
 12 Months Ended
Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]  
Noncurrent Other Liabilities
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


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

______________________________
(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, 2016 and 2015 is $10 million and $10 million, respectively, related to indemnifications received for a business acquired in 2005. The corresponding $10 million receivable is included in noncurrent Other assets in the consolidated balance sheet as of December 31, 2016.