Investment Securities (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Investment Securities Classified as Current and Long-Term

Investment securities classified as current and long-term were as follows at December 31, 2012 and 2011, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2012
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	602	$	16	$	0		$	618
Mortgage-backed securities		1,519		85		(1	)		1,603
Tax-exempt municipal securities		2,890		185		(4	)		3,071
Mortgage-backed securities:
Residential		33		2		(1	)		34
Commercial		615		44		0			659
Asset-backed securities		66		2		0			68
Corporate debt securities		3,394		402		(2	)		3,794
Total debt securities	$	9,119	$	736	$	(8	)	$	9,847
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

Schedule of Gross Unrealized Losses and Fair Value of Securities

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2012 and 2011, respectively:

	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, 2012
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	56	$	0		$	2	$	0		$	58	$	0
Mortgage-backed securities		38		0			25		(1	)		63		(1	)
Tax-exempt municipal securities		233		(3	)		27		(1	)		260		(4	)
Mortgage-backed securities:
Residential		0		0			4		(1	)		4		(1	)
Commercial		94		0			0		0			94		0
Asset-backed securities		2		0			4		0			6		0
Corporate debt securities		104		(2	)		4		0			108		(2	)
Total debt securities	$	527	$	(5	)	$	66	$	(3	)	$	593	$	(8	)
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	)

Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2012, 2011, and 2010:

	2012			2011			2010
	(in millions)
Gross realized gains	$	38		$	33		$	35
Gross realized losses		(5	)		(22	)		(29	)
Net realized capital gains	$	33		$	11		$	6

Schedule of Contractual Maturity of Debt Securities Available for Sale

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	359	$	362
Due after one year through five years		1,826		1,907
Due after five years through ten years		2,946		3,220
Due after ten years		1,755		1,994
Mortgage and asset-backed securities		2,233		2,364
Total debt securities	$	9,119	$	9,847