Invested Assets (Tables)

6 Months Ended

Jun. 30, 2011

Invested Assets (Tables) [Abstract]

Amortized cost and fair value of fixed maturities and equity securities

	June 30, 2011
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Appreciation		Depreciation		Value
	(in millions)
Fixed maturities
Tax exempt	$	19,216	$	1,008	$	60	$	20,164
Taxable
U.S. Government and government agency and authority obligations		803		36		7		832
Corporate bonds		6,453		419		17		6,855
Foreign government and government agency obligations		6,312		222		12		6,522
Residential mortgage-backed securities		1,061		53		6		1,108
Commercial mortgage-backed securities		1,811		76		1		1,886
		16,440		806		43		17,203
Total fixed maturities	$	35,656	$	1,814	$	103	$	37,367
Equity securities	$	1,292	$	421	$	50	$	1,663

	December 31, 2010
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Appreciation		Depreciation		Value
	(in millions)
Fixed maturities
Tax exempt	$	19,072	$	824	$	122	$	19,774
Taxable
U.S. Government and government agency and authority obligations		807		31		9		829
Corporate bonds		6,258		411		21		6,648
Foreign government and government agency obligations		5,943		231		13		6,161
Residential mortgage-backed securities		1,293		63		6		1,350
Commercial mortgage-backed securities		1,688		70		1		1,757
		15,989		806		50		16,745
Total fixed maturities	$	35,061	$	1,630	$	172	$	36,519
Equity securities	$	1,285	$	340	$	75	$	1,550

Amortized cost and fair value of fixed maturities by contractual maturity

	Amortized		Fair
	Cost		Value
	(in millions)
Due in one year or less	$	1,991	$	2,023
Due after one year through five years		11,536		12,102
Due after five years through ten years		11,870		12,647
Due after ten years		7,387		7,601
		32,784		34,373
Residential mortgage-backed securities		1,061		1,108
Commercial mortgage-backed securities		1,811		1,886
	$	35,656	$	37,367

Components of unrealized appreciation or depreciation of investments

	June 30		December 31
	2011		2010
	(in millions)
Fixed maturities
Gross unrealized appreciation	$	1,814	$	1,630
Gross unrealized depreciation		103		172
		1,711		1,458
Equity securities
Gross unrealized appreciation		421		340
Gross unrealized depreciation		50		75
		371		265
		2,082		1,723
Deferred income tax liability		729		603
	$	1,353	$	1,120

Fair value and gross unrealized depreciation of investments in an unrealized loss position

	Less Than 12 Months				12 Months or More				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Depreciation		Value		Depreciation		Value		Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	1,453	$	22	$	253	$	38	$	1,706	$	60
Taxable
U.S. Government and government agency and authority obligations		108		3		47		4		155		7
Corporate bonds		552		10		156		7		708		17
Foreign government and government agency obligations		1,120		10		42		2		1,162		12
Residential mortgage-backed securities		70		2		23		4		93		6
Commercial mortgage-backed securities		45		1		—		—		45		1
		1,895		26		268		17		2,163		43
Total fixed maturities		3,348		48		521		55		3,869		103
Equity securities		114		14		189		36		303		50
	$	3,462	$	62	$	710	$	91	$	4,172	$	153

	Less Than 12 Months				12 Months or More				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Depreciation		Value		Depreciation		Value		Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	2,498	$	79	$	284	$	43	$	2,782	$	122
Taxable
U.S. Government and government agency and authority obligations		111		3		45		6		156		9
Corporate bonds		474		12		166		9		640		21
Foreign government and government agency obligations		990		12		27		1		1,017		13
Residential mortgage-backed securities		9		1		41		5		50		6
Commercial mortgage-backed securities		38		1		—		—		38		1
		1,622		29		279		21		1,901		50
Total fixed maturities		4,120		108		563		64		4,683		172
Equity securities		69		14		299		61		368		75
	$	4,189	$	122	$	862	$	125	$	5,051	$	247

Change in unrealized appreciation or depreciation of investments carried at fair value

	Periods Ended June 30
	Second Quarter					Six Months
	2011		2010			2011		2010
			(in millions)
Change in unrealized appreciation of fixed maturities	$	430	$	331		$	253	$	442
Change in unrealized appreciation of equity securities		15		(243	)		106		(185	)
		445		88			359		257
Deferred income tax		156		31			126		90
	$	289	$	57		$	233	$	167

Realized investment gains and losses

	Periods Ended June 30
	Second Quarter						Six Months
	2011			2010			2011			2010
	(in millions)
Fixed maturities
Gross realized gains	$	10		$	19		$	23		$	57
Gross realized losses		(4	)		(6	)		(15	)		(11	)
Other-than-temporary impairment losses		—			(2	)		—			(3	)
		6			11			8			43
Equity securities
Gross realized gains		10			3			29			12
Gross realized losses		(1	)		(1	)		(1	)		(1	)
Other-than-temporary impairment losses		(14	)		(6	)		(16	)		(6	)
		(5	)		(4	)		12			5
Other invested assets		68			83			209			169
	$	69		$	90		$	229		$	217