Investments (tables)

9 Months Ended

Sep. 30, 2015

Investments disclosure

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

	Amortized		Gross Unrealized				Fair
(at September 30, 2015, in millions)	Cost		Gains		Losses		Value
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,324	$	24	$	3	$	2,345
Obligations of states, municipalities and political subdivisions:
Pre-refunded	6,287		302		—		6,589
All other	24,075		1,009		46		25,038
Total obligations of states, municipalities and political subdivisions	30,362		1,311		46		31,627
Debt securities issued by foreign governments	1,939		50		—		1,989
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	1,874		142		3		2,013
All other corporate bonds	23,082		687		187		23,582
Redeemable preferred stock	107		8		—		115
Total	$	59,688	$	2,222	$	239	$	61,671

	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 September 30, 2015, in millions)	Cost		Gains		Losses		Value
Public common stock	$	398	$	164	$	18	$	544
Non-redeemable preferred stock	155		27		7		175
Total	$	553	$	191	$	25	$	719

			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 September 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	$	499	$	2	$	25	$	1	$	524	$	3
Obligations of states, municipalities and political subdivisions	3,604		41		142		5		3,746		46
Debt securities issued by foreign governments	112		—		—		—		112		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	89		1		62		2		151		3
All other corporate bonds	5,322		130		696		57		6,018		187
Redeemable preferred stock	8		—		—		—		8		—
Total fixed maturities	9,634		174		925		65		10,559		239
Equity securities
Public common stock	75		18		34		—		109		18
Non-redeemable preferred stock	52		5		46		2		98		7
Total equity securities	127		23		80		2		207		25
Total	$	9,761	$	197	$	1,005	$	67	$	10,766	$	264

	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