Available-For-Sale Investments (Tables)

3 Months Ended

Mar. 31, 2012

Available-For-Sale Investments [Abstract]

Summary Of Fair Value Of Available-For-Sale Investments

	Amortized cost				Fair value
	March 31, 2012		December 31, 2011		March 31, 2012		December 31, 2011
Bonds, notes and other securities:
U.S. government and agencies	$	1,342	$	1,150	$	1,346	$	1,155
Other debt securities				6				9
Total short-term investments	$	1,342	$	1,156	$	1,346	$	1,164
Asset-backed securities	$	56	$	57	$	36	$	35
Total long-term investments	$	56	$	57	$	36	$	35

Summary Of Maturities Of Available-For-Sale Securities

Less than one year	$1,024
Due in 1-5 years	322
Due in 5-10 years
Due after 10 years (1)	36
Total	$1,382

(1) Includes $36 million of asset-based securities that mature over time and are being reported at their final maturity dates.

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

		March 31, 2012
		12 months or greater				Total
	Number of securities in a loss position	Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	22	$	36	$	(19)	$	36	$	(19)
Total long-term investments	22	$	36	$	(19)	$	36	$	(19)

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

		December 31, 2011
		12 months or greater				Total
	Number of securities in a loss position	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.