Noncurrent Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Other Liabilities, Noncurrent [Abstract]

Schedule of Noncurrent Other Liabilities

	As of December 31,
	2019	2018
	(In $ millions)
Asset retirement obligations	13	13
Deferred proceeds	43	44
Deferred revenue	6	7
Derivatives (Note 22)	50	11
Environmental (Note 16)	49	49
Insurance	34	37
Other	28	47
Total	223	208

Schedule of Changes in Asset Retirement Obligations

Changes in asset retirement obligations are as follows:

	Year Ended December 31,
	2019		2018		2017
	(In $ millions)
Balance at beginning of year	16		26		29
Additions(1)	5		2		—
Accretion	—		—		1
Payments	(3	)	(4	)	(5	)
Revisions to cash flow estimates(2)	1		(8	)	1
Balance at end of year	19		16		26

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⁽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.