Available-For-Sale Investments (Tables)

12 Months Ended

Dec. 31, 2012

Available-For-Sale Investments [Abstract]

Summary Of Fair Value Of Available-For-Sale Securities

	Amortized cost December 31,				Fair value December 31,
	2012		2011		2012		2011
Bonds, notes and other securities:
U.S. government and agencies	$	1,153	$	1,150	$	1,156	$	1,155
Other debt securities				6				9
Total short-term investments	$	1,153	$	1,156	$	1,156	$	1,164
Asset-backed securities	$	51	$	57	$	40	$	35
Total long-term investments	$	51	$	57	$	40	$	35

Summary Of Contractual Maturities Of Available-For-Sale Securities

The following table summarizes the contractual maturities of available-for-sale securities at December 31, 2012 (in millions):

Less than one year	$   821
Due in 1-5 years	335
Due in 5-10 years
Due after 10 years (1)	40
Total	$1,196

(1) Included in the maturity table is $40 million of asset-based securities that mature over time and are being reported at their final maturity dates.

Fair Value And Gross Unrealized Losses Of Investments By Length Of Time In Continuous Unrealized Loss Position

	Number of securities  in a loss position	December 31, 2012
		12 months or greater				Total
		Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	22	$	40	$	(11)	$	40	$	(11)
Total long-term investments	22	$	40	$	(11)	$	40	$	(11)

(1) Unrealized losses in securities less than 12 months were not significant.

	Number of securities  in a loss position	December 31, 2011
		12 months or greater				Total
		Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	22	$	35	$	(23)	$	35	$	(23)
Total long-term investments	22	$	35	$	(23)	$	35	$	(23)

(1)      Unrealized losses in securities less than 12 months were not significant.