Marketable Securities, at Fair Value (Tables)

9 Months Ended

Sep. 30, 2012

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	As of
	September 30, 2012	December 31, 2011
	(In $ millions)
Mutual Funds
Amortized cost	56	64
Gross unrealized gain	—	—
Gross unrealized loss	—	—
Fair value	56	64