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Noncurrent Other Liabilities
 12 Months Ended
Dec. 31, 2018
Other Liabilities, Noncurrent [Abstract]  
Noncurrent Other Liabilities
Noncurrent Other Liabilities
 
As of December 31,
 
2018
 
2017
 
(In $ millions)
Asset retirement obligations
13

 
7

Deferred proceeds
44

 
47

Deferred revenue
7

 
6

Derivatives (Note 22)
11

 
—

Environmental (Note 16)
49

 
59

Income taxes payable (Note 19)
—

 
197

Insurance
37

 
43

Other
47

 
54

Total
208

 
413


Changes in asset retirement obligations are as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In $ millions)
Balance at beginning of year
26

 
29

 
36

Additions(1)
2

 
—

 
2

Accretion
—

 
1

 
1

Payments
(4
)
 
(5
)
 
(10
)
Revisions to cash flow estimates(2)
(8
)
 
1

 
—

Balance at end of year
16

 
26

 
29

______________________________
(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 year ended 2017 was $10 million related to indemnifications received for a business acquired in 2005. The corresponding indemnification receivable is included in Non-trade receivables, net in the consolidated balance sheet as of December 31, 2017. The asset retirement obligation related to the indemnification receivable was completed during 2018.