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, 2011	$ 4,557		$ 1,219	$ 173	$ 2,439	$ 580	$ 4,411	$ 146
Beginning 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
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
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)				0	0	0	(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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	406				452		452	(46)
Other comprehensive income (loss)	170					167	167	3
Allocation of losses of managed investment entities	0			(51)			(51)	51
Dividends on Common Stock	(169)				(169)		(169)
Shares issued:
Exercise of stock options, shares	1,262,313	1,262,313
Exercise of stock options	45		45				45
Other benefit plans, shares		242,669
Other benefit plans	8		8				8
Dividend reinvestment plan, shares		27,238
Dividend reinvestment plan	2		2				2
Stock-based compensation expense	19		19				19
Shares acquired and retired, shares		(3,303,639)
Shares acquired and retired	(191)		(46)		(145)		(191)
Shares exchanged - benefit plans, shares		(33,174)
Shares exchanged - benefit plans	(2)		(1)		(1)		(2)
Other	(3)							(3)
Ending Balance at Dec. 31, 2014	$ 5,054		$ 1,240	$ (2)	$ 2,914	$ 727	$ 4,879	$ 175
Ending Balance, shares at Dec. 31, 2014	87,708,793	87,708,793