Marketable Securities, at Fair Value (Tables)

6 Months Ended

Jun. 30, 2013

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 June 30, 2013	As of December 31, 2012
	(In $ millions)
Mutual Funds
Amortized cost	45	53
Gross unrealized gain	—	—
Gross unrealized loss	—	—
Fair value	45	53