Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

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Schedule of Carrying Values and Fair Values of Financial Instruments

Carrying values and fair values of financial instruments that are not carried at fair value are as follows:

			Fair Value Measurement
	Carrying Amount		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Total
	As of December 31,
	2017	2016	2017	2016	2017	2016	2017	2016
	(In $ millions)
Cost investments	159	155	—	—	—	—	—	—
Insurance contracts in nonqualified trusts	42	49	42	49	—	—	42	49
Long-term debt, including current installments of long-term debt	3,398	2,938	3,299	2,826	208	217	3,507	3,043