Condensed Consolidated Statements of Shareholders' Equity (USD $) In Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance at Dec. 31, 2010
Cumulative effect of a change in accounting for deferred policy acquisition costs, net of tax	$ (22)			$ (22)
Balance (As Adjusted)	5,033	393	1,096	3,863	901	(1,220)
Balance at Dec. 31, 2011	5,055	393	1,096	3,885	901	(1,220)
Balance (in shares) (As Adjusted)		162
Balance (in shares) at Dec. 31, 2011		162
NET INCOME	86			86
Other comprehensive income, net	146				146
Dividends declared	(65)			(65)
Stock-based awards exercised and vested (in shares)		0
Stock-based awards exercised and vested	1		0			1
Stock-based compensation	4		4
Purchases	0					0
Other	2		0			2
Balance at Mar. 31, 2012	5,207	393	1,100	3,884	1,047	(1,217)
Balance (in shares) at Mar. 31, 2012		162
Balance at Dec. 31, 2012	5,453	394	1,134	4,021	1,129	(1,225)
Balance (in shares) at Dec. 31, 2012	197	163
NET INCOME	154			154
Other comprehensive income, net	233				233
Dividends declared	(66)			(66)
Stock-based awards exercised and vested (in shares)		0
Stock-based awards exercised and vested	13	1	7			5
Stock-based compensation	5		5
Purchases	(9)					(9)
Other	2		0			2
Balance (As Adjusted)	5,785
Balance at Mar. 31, 2013	$ 5,785	$ 395	$ 1,146	$ 4,109	$ 1,362	$ (1,227)
Balance (in shares) at Mar. 31, 2013	197	163