Investments (tables)

6 Months Ended

Jun. 30, 2015

Investments disclosure

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

	Amortized		Gross Unrealized				Fair
(at June 30, 2015, in millions)	Cost		Gains		Losses		Value
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,025	$	28	$	7	$	2,046
Obligations of states, municipalities and political subdivisions:
Pre-refunded	6,966		306		1		7,271
All other	24,704		888		153		25,439
Total obligations of states, municipalities and political subdivisions	31,670		1,194		154		32,710
Debt securities issued by foreign governments	2,049		52		1		2,100
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	1,905		147		6		2,046
All other corporate bonds	22,341		714		147		22,908
Redeemable preferred stock	113		10		—		123
Total	$	60,103	$	2,145	$	315	$	61,933

	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 June 30, 2015, in millions)	Cost		Gains		Losses		Value
Public common stock	$	410	$	235	$	6	$	639
Non-redeemable preferred stock	163		29		3		189
Total	$	573	$	264	$	9	$	828

			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
(at June 30, 2015, in millions)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	507	$	7	$	24	$	—	$	531	$	7
Obligations of states, municipalities and political subdivisions	7,737		147		135		7		7,872		154
Debt securities issued by foreign governments	154		1		—		—		154		1
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	274		2		126		4		400		6
All other corporate bonds	5,509		114		570		33		6,079		147
Redeemable preferred stock	2		—		—		—		2		—
Total fixed maturities	14,183		271		855		44		15,038		315
Equity securities
Public common stock	51		6		29		—		80		6
Non-redeemable preferred stock	55		1		50		2		105		3
Total equity securities	106		7		79		2		185		9
Total	$	14,289	$	278	$	934	$	46	$	15,223	$	324

	Less than 12 months				12 months or longer				Total
(at December 31, 2014, in millions)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized 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