Investments (tables)

3 Months Ended

Mar. 31, 2015

Investments disclosure

Amortized cost and fair value of investments in fixed maturities [Table Text Block]

	Amortized		Gross Unrealized				Fair
(at March 31, 2015, in millions)	Cost		Gains		Losses		Value
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,036	$	45	$	2	$	2,079
Obligations of states, municipalities and political subdivisions:
Pre-refunded	6,893		324		—		7,217
All other	24,591		1,276		24		25,843
Total obligations of states, municipalities and political subdivisions	31,484		1,600		24		33,060
Debt securities issued by foreign governments	2,117		65		—		2,182
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	1,986		170		3		2,153
All other corporate bonds	22,180		1,036		45		23,171
Redeemable preferred stock	113		11		—		124
Total	$	59,916	$	2,927	$	74	$	62,769

	Amortized		Gross Unrealized				Fair
(at December 31, 2014, in millions)	Cost		Gains		Losses		Value
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,022	$	36	$	5	$	2,053
Obligations of states, municipalities and political subdivisions:
Pre-refunded	7,229		332		—		7,561
All other	24,666		1,356		10		26,012
Total obligations of states, municipalities and political subdivisions	31,895		1,688		10		33,573
Debt securities issued by foreign governments	2,320		48		—		2,368
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	2,052		165		4		2,213
All other corporate bonds	22,390		844		99		23,135
Redeemable preferred stock	122		10		—		132
Total	$	60,801	$	2,791	$	118	$	63,474

Cost and fair value of investments in equity securities [Table Text Block]

			Gross Unrealized				Fair
(at March 31, 2015, in millions)	Cost		Gains		Losses		Value
Public common stock	$	399	$	278	$	3	$	674
Non-redeemable preferred stock	164		30		2		192
Total	$	563	$	308	$	5	$	866

			Gross Unrealized				Fair
(at December 31, 2014, in millions)	Cost		Gains		Losses		Value
Public common stock	$	400	$	295	$	4	$	691
Non-redeemable preferred stock	179		31		2		208
Total	$	579	$	326	$	6	$	899

Unrealized investment losses [Table Text Block]

	Less than 12 months				12 months or longer				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(at March 31, 2015, in millions)	Value		Losses		Value		Losses		Value		Losses
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	500	$	2	$	15	$	—	$	515	$	2
Obligations of states, municipalities and political subdivisions	1,884		20		143		4		2,027		24
Debt securities issued by foreign governments	75		—		—		—		75		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	60		—		133		3		193		3
All other corporate bonds	1,494		27		593		18		2,087		45
Redeemable preferred stock	1		—		—		—		1		—
Total fixed maturities	4,014		49		884		25		4,898		74
Equity securities
Public common stock	74		3		1		—		75		3
Non-redeemable preferred stock	72		1		30		1		102		2
Total equity securities	146		4		31		1		177		5
Total	$	4,160	$	53	$	915	$	26	$	5,075	$	79

	Less than 12 months				12 months or longer				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(at December 31, 2014, in millions)	Value		Losses		Value		Losses		Value		Losses
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	180	$	2	$	125	$	3	$	305	$	5
Obligations of states, municipalities and political subdivisions	173		1		797		9		970		10
Debt securities issued by foreign governments	50		—		24		—		74		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	68		—		192		4		260		4
All other corporate bonds	2,148		38		2,355		61		4,503		99
Total fixed maturities	2,619		41		3,493		77		6,112		118
Equity securities
Public common stock	81		4		1		—		82		4
Non-redeemable preferred stock	44		1		42		1		86		2
Total equity securities	125		5		43		1		168		6
Total	$	2,744	$	46	$	3,536	$	78	$	6,280	$	124