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Noncurrent Other Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]  
Noncurrent Other Liabilities
Noncurrent Other Liabilities
 
As of December 31,
 
2017
 
2016
 
(In $ millions)
Asset retirement obligations
7

 
20

Deferred proceeds
47

 
41

Deferred revenue
6

 
9

Environmental (Note 16)
59

 
50

Income taxes payable (Note 19)
197

 
6

Insurance
43

 
46

Other
54

 
43

Total
413

 
215


Changes in asset retirement obligations are as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In $ millions)
Balance at beginning of year
29

 
36

 
37

Additions(1)
—

 
2

 
—

Accretion
1

 
1

 
1

Payments
(5
)
 
(10
)
 
(4
)
Revisions to cash flow estimates(2)
1

 
—

 
2

Balance at end of year
26

 
29

 
36

______________________________
(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, 2017 and 2016 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 Non-trade receivables, net in the consolidated balance sheet as of December 31, 2017.