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, 2011	$ 4,557		$ 1,219	$ 173	$ 2,439	$ 580	$ 4,411	$ 146
Beginning Balance, shares at Dec. 31, 2011		97,846,402
Net earnings	172				212		212	(40)
Other comprehensive income	196					193	193	3
Allocation of losses of managed investment entities	0			(46)			(46)	46
Dividends on Common Stock	(33)				(33)		(33)
Shares issued:
Exercise of stock options, shares		814,394
Exercise of stock options	21		21				21
Other benefit plans, shares		276,195
Other benefit plans	5		5				5
Dividend reinvestment plan, shares		7,711
Dividend reinvestment plan	0		0				0
Stock-based compensation expense	12		12				12
Shares acquired and retired, shares		(3,985,470)
Shares acquired and retired	(153)		(50)		(103)		(153)
Other	(2)							(2)
Ending Balance at Jun. 30, 2012	4,775		1,207	127	2,515	773	4,622	153
Ending Balance, shares at Jun. 30, 2012		94,959,232
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	88,979,303
Net earnings	190				230		230	(40)
Other comprehensive income	(238)					(232)	(232)	(6)
Allocation of losses of managed investment entities	0			(42)			(42)	42
Dividends on Common Stock	(34)				(34)		(34)
Shares issued:
Exercise of stock options, shares		943,697
Exercise of stock options	30		30				30
Other benefit plans, shares		368,051
Other benefit plans	6		6				6
Dividend reinvestment plan, shares		7,398
Stock-based compensation expense	8		8				8
Shares acquired and retired, shares		(1,448,156)
Shares acquired and retired	(70)		(19)		(51)		(70)
Shares exchanged - benefit plans, shares		(29,353)
Shares exchanged - benefit plans	(1)				(1)		(1)
Other	(1)							(1)
Ending Balance at Jun. 30, 2013	$ 4,638		$ 1,177	$ 33	$ 2,664	$ 599	$ 4,473	$ 165
Ending Balance, shares at Jun. 30, 2013	88,820,940	88,820,940