FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 2014

Financial Assets Measured at Fair Value on Recurring Basis

The following table summarizes our fair value measurements at March 31, 2014 and December 31, 2013, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
March 31, 2014
Cash equivalents	$	1,197	$	1,197	$	0	$	0
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations		520		0		520		0
Mortgage-backed securities		1,872		0		1,872		0
Tax-exempt municipal securities		3,166		0		3,153		13
Mortgage-backed securities:
Residential		20		0		20		0
Commercial		665		0		665		0
Asset-backed securities		50		0		49		1
Corporate debt securities		3,755		0		3,732		23
Total debt securities		10,048		0		10,011		37
Total invested assets	$	11,245	$	1,197	$	10,011	$	37
December 31, 2013
Cash equivalents	$	876	$	876	$	0	$	0
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations		584		0		584		0
Mortgage-backed securities		1,820		0		1,820		0
Tax-exempt municipal securities		2,971		0		2,958		13
Mortgage-backed securities:
Residential		22		0		22		0
Commercial		673		0		673		0
Asset-backed securities		63		0		62		1
Corporate debt securities		3,667		0		3,644		23
Total debt securities		9,800		0		9,763		37
Total invested assets	$	10,676	$	876	$	9,763	$	37

Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs

During the three months ended March 31, 2014 and 2013, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:

	For the three months ended March 31,
	2014						2013
	Private Placements		Auction Rate Securities		Total		Private Placements			Auction Rate Securities		Total
	(in millions)
Beginning balance at January 1	$	24	$	13	$	37	$	25		$	13	$	38
Total gains or losses:
Realized in earnings		0		0		0		0			0		0
Unrealized in other comprehensive income		0		0		0		1			0		1
Purchases		0		0		0		0			0		0
Sales		0		0		0		0			0		0
Settlements		0		0		0		(1	)		0		(1	)
Balance at March 31	$	24	$	13	$	37	$	25		$	13	$	38