Consolidated Statement of Changes in Equity (Unaudited) (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, 2012	$ 4,748		$ 1,152	$ 75	$ 2,520	$ 831	$ 4,578	$ 170
Beginning Balance, shares at Dec. 31, 2012		88,979,303
Net earnings	113				120		120	(7)
Other comprehensive income	39					38	38	1
Allocation of losses of managed investment entities	0			(11)			(11)	11
Dividends on Common Stock	(17)				(17)		(17)
Shares issued:
Exercise of stock options, shares		646,136
Exercise of stock options	21		21				21
Other benefit plans, shares		344,736
Other benefit plans	4		4				4
Dividend reinvestment plan, shares		3,986
Dividend reinvestment plan
Stock-based compensation expense	4		4				4
Shares acquired and retired, shares		(61,586)
Shares acquired and retired	(3)		(1)		(2)		(3)
Shares exchanged - benefit plans, shares		(29,353)
Shares exchanged - benefit plans	(1)				(1)		(1)
Ending Balance at Mar. 31, 2013	4,908		1,180	64	2,620	869	4,733	175
Ending Balance, shares at Mar. 31, 2013		89,883,222
Beginning Balance at Dec. 31, 2013	4,769		1,213	49	2,777	560	4,599	170
Beginning Balance, shares at Dec. 31, 2013	89,513,386	89,513,386
Net earnings	107				103		103	4
Other comprehensive income	120					117	117	3
Allocation of losses of managed investment entities	0			0			0	0
Dividends on Common Stock	(19)				(19)		(19)
Shares issued:
Exercise of stock options, shares		323,473
Exercise of stock options	11		11				11
Other benefit plans, shares		192,525
Other benefit plans	5		5				5
Dividend reinvestment plan, shares		3,343
Stock-based compensation expense	5		5				5
Shares acquired and retired, shares		(419,938)
Shares acquired and retired	(24)		(6)		(18)		(24)
Shares exchanged - benefit plans, shares		(23,790)
Shares exchanged - benefit plans	(1)				(1)		(1)
Ending Balance at Mar. 31, 2014	$ 4,973		$ 1,228	$ 49	$ 2,842	$ 677	$ 4,796	$ 177
Ending Balance, shares at Mar. 31, 2014	89,588,999	89,588,999