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	229			229
Other comprehensive income, net	270				270
Dividends declared	(196)			(196)
Stock-based awards exercised and vested (in shares)		1
Stock-based awards exercised and vested	13	1	10			2
Stock-based compensation	12		12
Purchases	(7)					(7)
Other	5		1			4
Balance at Sep. 30, 2012	5,359	394	1,119	3,896	1,171	(1,221)
Balance (in shares) at Sep. 30, 2012		163
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	395			395
Other comprehensive income, net	138				138
Dividends declared	(202)			(202)
Stock-based awards exercised and vested (in shares)		1
Stock-based awards exercised and vested	34	2	27			5
Stock-based compensation	14		14
Purchases	(22)					(22)
Other	6		2			4
Balance (As Adjusted)	5,816
Balance at Sep. 30, 2013	$ 5,816	$ 396	$ 1,177	$ 4,214	$ 1,267	$ (1,238)
Balance (in shares) at Sep. 30, 2013	198	164