Investment Securities (Tables)

12 Months Ended

Dec. 31, 2011

Investment Securities [Abstract]

Schedule Of Securities Classified As Current And Long-Term

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2011
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	705	$	20	$	0		$	725
Mortgage-backed securities		1,701		85		(2	)		1,784
Tax-exempt municipal securities		2,709		149		(2	)		2,856
Mortgage-backed securities:
Residential		46		0		(2	)		44
Commercial		356		25		0			381
Asset-backed securities		82		1		0			83
Corporate debt securities		3,329		262		(11	)		3,580
Total debt securities	$	8,928	$	542	$	(17	)	$	9,453
December 31, 2010
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	698	$	14	$	0		$	712
Mortgage-backed securities		1,615		50		(1	)		1,664
Tax-exempt municipal securities		2,440		37		(44	)		2,433
Mortgage-backed securities:
Residential		58		1		(3	)		56
Commercial		306		15		0			321
Asset-backed securities		148		2		0			150
Corporate debt securities		2,906		140		(14	)		3,032
Redeemable preferred stock		5		0		0			5
Total debt securities	$	8,176	$	259	$	(62	)	$	8,373

Schedule Of Gross Unrealized Losses And Fair Value Of Securities

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2011
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	117	$	0		$	0	$	0		$	117	$	0
Mortgage-backed securities		67		(1	)		18		(1	)		85		(2	)
Tax-exempt municipal securities		53		0			48		(2	)		101		(2	)
Mortgage-backed securities:
Residential		3		0			24		(2	)		27		(2	)
Commercial		14		0			0		0			14		0
Asset-backed securities		16		0			4		0			20		0
Corporate debt securities		355		(10	)		41		(1	)		396		(11	)
Total debt securities	$	625	$	(11	)	$	135	$	(6	)	$	760	$	(17	)
December 31, 2010
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	142	$	0		$	0	$	0		$	142	$	0
Mortgage-backed securities		110		(1	)		6		0			116		(1	)
Tax-exempt municipal securities		1,168		(33	)		98		(11	)		1,266		(44	)
Mortgage-backed securities:
Residential		0		0			33		(3	)		33		(3	)
Commercial		0		0			3		0			3		0
Asset-backed securities		17		0			0		0			17		0
Corporate debt securities		384		(10	)		31		(4	)		415		(14	)
Total debt securities	$	1,821	$	(44	)	$	171	$	(18	)	$	1,992	$	(62	)

Schedule Of Realized Gains (Losses) Related To Investment Securities And Included With Investment Income

	2011			2010			2009
	(in millions)
Gross realized gains	$	33		$	35		$	123
Gross realized losses		(22	)		(29	)		(103	)
Net realized capital gains	$	11		$	6		$	20

Schedule Of Contractual Maturity Of Debt Securities Available For Sale

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	427	$	431
Due after one year through five years		1,841		1,905
Due after five years through ten years		2,688		2,863
Due after ten years		1,787		1,962
Mortgage and asset-backed securities		2,185		2,292
Total debt securities	$	8,928	$	9,453