Property Casualty Loss And Loss Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Property Casualty Loss And Loss Expenses [Abstract]

Consolidated Property Casualty Loss And Loss Expense Reserves

(In millions)	Years ended December 31,
		2012		2011		2010
Gross loss and loss expense reserves, January 1	$	4,280	$	4,137	$	4,096
Less reinsurance receivable		375		326		435
Net loss and loss expense reserves, January 1		3,905		3,811		3,661
Net incurred loss and loss expenses related to:
Current accident year		2,533		2,620		2,319
Prior accident years		(396)		(285)		(304)
Total incurred		2,137		2,335		2,015
Net paid loss and loss expenses related to:
Current accident year		1,123		1,206		939
Prior accident years		1,106		1,035		926
Total paid		2,229		2,241		1,865
Net loss and loss expense reserves, December 31		3,813		3,905		3,811
Plus reinsurance receivable		356		375		326
Gross loss and loss expense reserves, December 31	$	4,169	$	4,280	$	4,137