Available-For-Sale Investments (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2011

Dec. 31, 2010

Available-For-Sale Investments

Summary Of Fair Value Of Available-For-Sale Investments

	Amortized cost				Fair value
	September 30, 2011		December 31, 2010		September 30, 2011		December 31, 2010
Bonds, notes and other securities:
U.S. government and agencies	$	1,507	$	1,734	$	1,512	$	1,737
Other debt securities		6		11		8		15
Total short-term investments	$	1,513	$	1,745	$	1,520	$	1,752
Asset-backed securities	$	59	$	64	$	38	$	45
Total long-term investments	$	59	$	64	$	38	$	45

Summary Of Contractual Maturities Of Available-For-Sale Securities

The following table summarizes the maturities at market value of available-for-sale securities at September 30, 2011 (in millions):

Less than one year	$1,193
Due in 1-5 years	319
Due in 5-10 years
Due after 10 years (1)	46
Total	$1,558

(1) Includes $38 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

		September 30, 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	$	38	$	(21)	$	38	$	(21)
Total long-term investments	22	$	38	$	(21)	$	38	$	(21)

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

		December 31, 2010
		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	$	45	$	(20)	$	45	$	(20)
Total long-term investments	22	$	45	$	(20)	$	45	$	(20)

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

Reconciliation Of The Changes In Credit Losses Recognized In Earnings

	2011	2010
Beginning balance of credit losses, January 1	$ 4	$ 2
Additions for credit losses not previously recognized in earnings
Balance of credit losses, March 31	$ 4	$ 2
Additions for credit losses not previously recognized in earnings	1	1
Ending balance of credit losses, June 30	$ 5	$ 3
Additions for credit losses not previously recognized in earnings
Ending balance of credit losses, September 30	$ 5	$ 3