Fair Value Measurements (tables)

6 Months Ended

Jun. 30, 2015

Fair Value Measurements disclosure

Level within the fair value hierarchy at which the Company's financial assets and financial liabilities reported at fair value are measured [Table Text Block]

(at June 30, 2015, in millions)	Total		Level 1		Level 2		Level 3
Invested assets:
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,046	$	2,043	$	3	$	—
Obligations of states, municipalities and political subdivisions	32,710		7		32,689		14
Debt securities issued by foreign governments	2,100		—		2,100		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	2,046		—		2,010		36
All other corporate bonds	22,908		—		22,751		157
Redeemable preferred stock	123		3		113		7
Total fixed maturities	61,933		2,053		59,666		214
Equity securities
Public common stock	639		637		—		2
Non-redeemable preferred stock	189		71		118		—
Total equity securities	828		708		118		2
Other investments	58		18		—		40
Total	$	62,819	$	2,779	$	59,784	$	256

(at December 31, 2014, in millions)	Total		Level 1		Level 2		Level 3
Invested assets:
Fixed maturities
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities	$	2,053	$	2,049	$	4	$	—
Obligations of states, municipalities and political subdivisions	33,573		—		33,560		13
Debt securities issued by foreign governments	2,368		—		2,368		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	2,213		—		2,203		10
All other corporate bonds	23,135		—		22,934		201
Redeemable preferred stock	132		2		122		8
Total fixed maturities	63,474		2,051		61,191		232
Equity securities
Public common stock	691		691		—		—
Non-redeemable preferred stock	208		82		126		—
Total equity securities	899		773		126		—
Other investments	55		19		—		36
Total	$	64,428	$	2,843	$	61,317	$	268

Carrying value and fair value of financial instruments disclosed, but not carried, at fair value and the level within the fair value hierarchy at which such financial instruments are categorized [Table Text Block]

(at June 30, 2015, in millions)	Carrying Value		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Short-term securities	$	3,924	$	3,924	$	1,387	$	2,497	$	40
Financial liabilities:
Debt	$	6,250	$	7,237	$	—	$	7,237	$	—
Commercial paper	$	100	$	100	$	—	$	100	$	—

(at December 31, 2014, in millions)	Carrying Value		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Short-term securities	$	4,364	$	4,364	$	1,283	$	3,042	$	39
Financial liabilities:
Debt	$	6,249	$	7,522	$	—	$	7,522	$	—
Commercial paper	$	100	$	100	$	—	$	100	$	—