Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities

Schedule of Marketable Securities

	Dec. 31,		Dec. 31,
(Millions)	2011		2010
U.S. government agency securities	$	119	$	246
Foreign government agency securities	8		52
Corporate debt securities	413		280
Commercial paper	30		55
Certificates of deposit/time deposit	49		29
U.S. treasury securities	—		55
U.S. municipal securities	9		20
Asset-backed securities:
Automobile loan related	530		253
Credit card related	244		79
Equipment lease related	54		24
Other	5		8
Asset-backed securities total	833		364
Current marketable securities	$	1,461	$	1,101
U.S. government agency securities	$	361	$	63
Foreign government agency securities	15		3
Corporate debt securities	255		192
U.S. treasury securities	34		44
U.S. municipal securities	5		3
Auction rate securities	4		7
Asset-backed securities:
Automobile loan related	188		144
Credit card related	24		70
Equipment lease related	10		14
Asset-backed securities total	222		228
Non-current marketable securities	$	896	$	540
Total marketable securities	$	2,357	$	1,641

Marketable securities by contractual maturity

	Dec. 31,
(Millions)	2011
Due in one year or less	$	867
Due after one year through three years	1,339
Due after three years through five years	138
Due after five years	13
Total marketable securities	$	2,357