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Marketable Securities, at Fair Value
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities, at Fair Value
Marketable Securities, at Fair Value
The Company's nonqualified trusts hold available-for-sale securities for funding requirements of the Company's nonqualified pension plans (Note 11) as follows:
 
As of
September 30,
2018
 
As of
December 31,
2017
 
(In $ millions)
Amortized cost
31

 
32

Gross unrealized gain
—

 
—

Gross unrealized loss
—

 
—

Fair value
31

 
32