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Noncurrent Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]  
Schedule of 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
Schedule of Changes in Asset Retirement Obligations
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.