Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Our investments in marketable securities consisted of the following:



	As of March 31, 2015				As of December 31, 2014
(millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Corporate debt securities	$	57	$	57	$	93	$	93
U.S. government and agency debt securities	6		6		22		22
Asset-backed debt securities	13		13		17		17
Certificates of deposit	11		11		18		18
Municipal debt securities	2		2		4		4
Total marketable securities	$	89	$	89	$	154	$	154

Contractual maturities of marketable securities

Contractual maturities of marketable securities as of March 31, 2015 were as follows:



(millions)	Amortized Cost		Fair Value
Due in 1 year or less	$	61	$	61
Due in 1-5 years	28		28
Total marketable securities	$	89	$	89

- 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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