Consolidated Statement of Changes in Equity (USD $) In Millions, except Share data, unless otherwise specified	Total USD ($)	Common Shares	Common Stock and Capital Surplus USD ($)	Retained Earnings Approp. USD ($)	Retained Earnings Unapprop. USD ($)	Accumulated Other Comprehensive Inc. (Loss) USD ($)	Total USD ($)	Noncontrolling Interests USD ($)
Beginning Balance at Dec. 31, 2010	$ 4,481		$ 1,271	$ 197	$ 2,368	$ 495	$ 4,331	$ 150
Beginning Balance, shares at Dec. 31, 2010		105,168,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	319				342		342	(23)
Other comprehensive income (loss)	91					85	85	6
Allocation of losses of managed investment entities	0			(24)			(24)	24
Dividends on Common Stock	(69)				(69)		(69)
Shares issued:
Exercise of stock options, shares		1,576,664
Exercise of stock options	38		38				38
Other benefit plans, shares		387,746
Other benefit plans	9		9				9
Dividend reinvestment plan, shares		15,763
Dividend reinvestment plan	1		1				1
Stock-based compensation expense	14		14				14
Shares acquired and retired, shares		(9,281,386)
Shares acquired and retired	(315)		(113)		(202)		(315)
Shares exchanged - benefit plans, shares		(20,751)
Shares exchanged - benefit plans	(1)		(1)				(1)
Other	(11)							(11)
Ending Balance at Dec. 31, 2011	4,557		1,219	173	2,439	580	4,411	146
Ending Balance, shares at Dec. 31, 2011		97,846,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	402				488		488	(86)
Other comprehensive income (loss)	260					252	252	8
Allocation of losses of managed investment entities	0			(98)			(98)	98
Dividends on Common Stock	(91)				(91)		(91)
Shares issued:
Exercise of stock options, shares		1,702,782
Exercise of stock options	45		45				45
Other benefit plans, shares		308,352
Other benefit plans	7		7				7
Dividend reinvestment plan, shares		21,484
Dividend reinvestment plan	1		1				1
Stock-based compensation expense	18		18				18
Shares acquired and retired, shares		(10,864,184)
Shares acquired and retired	(415)		(137)		(278)		(415)
Shares exchanged - benefit plans, shares		(35,533)
Shares exchanged - benefit plans	(1)		(1)				(1)
Other	(35)				(38)	(1)	(39)	4
Ending Balance at Dec. 31, 2012	4,748		1,152	75	2,520	831	4,578	170
Ending Balance, shares at Dec. 31, 2012	88,979,303	88,979,303
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	453				471		471	(18)
Other comprehensive income (loss)	(277)					(271)	(271)	(6)
Allocation of losses of managed investment entities	0			(26)			(26)	26
Dividends on Common Stock	(161)				(161)		(161)
Shares issued:
Exercise of stock options, shares	1,625,023	1,625,023
Exercise of stock options	53		53				53
Other benefit plans, shares		388,043
Other benefit plans	7		7				7
Dividend reinvestment plan, shares		28,147
Dividend reinvestment plan	2		2				2
Stock-based compensation expense	19		19				19
Shares acquired and retired, shares		(1,448,156)
Shares acquired and retired	(70)		(19)		(51)		(70)
Shares exchanged - benefit plans, shares		(58,974)
Shares exchanged - benefit plans	(3)		(1)		(2)		(3)
Other	(2)							(2)
Ending Balance at Dec. 31, 2013	$ 4,769		$ 1,213	$ 49	$ 2,777	$ 560	$ 4,599	$ 170
Ending Balance, shares at Dec. 31, 2013	89,513,386	89,513,386