Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Effect Of Adopting ASU 2010-26

(In millions, except per share amounts)	December 31,		December 31,
	2012		2011
			As originally reportedPreviously Reported		As adjusted		Difference
Deferred policy acquisition costs	$	470	$	510	$	477	$	(33)
Total assets		16,548		15,668		15,635		(33)
Deferred income tax liability		453		314		303		(11)
Shareholders' equity		5,453		5,055		5,033		(22)
Book value per share		33.48		31.16		31.03		(0.13)

The following table illustrates the effect of adopting ASU 2010-26 in the consolidated statements of comprehensive income:

(In millions, except per share amounts)	Years ended December 31,
	2012		2011						2010
			As originally reported		As adjusted		Difference		As originally reported		As adjusted		Difference
Underwriting, acquisition and insurance expenses	$	1,155	$	1,036	$	1,039	$	3	$	1,021	$	1,024	$	3
Net income		421		166		164		(2)		377		375		(2)
Net income per share:
Basic	$	2.59	$	1.02	$	1.01	$	(0.01)	$	2.32	$	2.30	$	(0.02)
Diluted		2.57		1.02		1.01		(0.01)		2.31		2.30		(0.01)