Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Our investments in marketable securities consisted of the following:



	As of September 30, 2013				As of December 31, 2012
(millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Corporate debt securities	$	88	$	88	$	82	$	82
U.S. government and agency debt securities	11		11		16		16
Non-U.S. government debt securities	—		—		1		1
Asset-backed debt securities	14		14		6		6
Certificates of deposit	17		17		16		16
Municipal debt securities	8		8		10		10
Total marketable securities	$	138	$	138	$	131	$	131

Contractual maturities of marketable securities

Contractual maturities of marketable securities as of September 30, 2013 were as follows:



(millions)	Amortized Cost		Fair Value
Due in 1 year or less	$	100	$	100
Due in 1-5 years	38		38
Total marketable securities	$	138	$	138

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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