Marketable Securities, at Fair Value (Tables)
 9 Months Ended
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities
The amortized cost, gross unrealized gain, gross unrealized loss and fair values for available-for-sale securities by major security type are as follows:
 
As of
September 30,
2014
 
As of
December 31,
2013
 
(In $ millions)
Mutual Funds
 
 
 
Amortized cost
36

 
41

Gross unrealized gain
—

 
—

Gross unrealized loss
—

 
—

Fair value
36

 
41