Fair Value Measurements (tables)

3 Months Ended

Mar. 31, 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 March 31, 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	$	2,079	$	2,075	$	4	$	—
Obligations of states, municipalities and political subdivisions	33,060		67		32,980		13
Debt securities issued by foreign governments	2,182		—		2,182		—
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities	2,153		—		2,135		18
All other corporate bonds	23,171		12		22,985		174
Redeemable preferred stock	124		—		117		7
Total fixed maturities	62,769		2,154		60,403		212
Equity securities
Public common stock	674		674		—		—
Non-redeemable preferred stock	192		73		119		—
Total equity securities	866		747		119		—
Other investments	56		18		—		38
Total	$	63,691	$	2,919	$	60,522	$	250

(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 March 31, 2015, in millions)	Carrying Value		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Short-term securities	$	4,490	$	4,490	$	1,238	$	3,215	$	37
Financial liabilities:
Debt	$	6,249	$	7,654	$	—	$	7,654	$	—
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	$	—