Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Total	Common Shares	Common Stock and Capital Surplus	Retained Earnings Approp.	Retained Earnings Unapprop.	Accumulated Other Comprehensive Inc. (Loss)	Noncontrolling Interests
Beginning Balance, shares at Dec. 31, 2013			89,513,386
Beginning Balance at Dec. 31, 2013	$ 4,769	$ 4,599		$ 1,213	$ 49	$ 2,777	$ 560	$ 170
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	190	209				209		(19)
Other comprehensive income (loss)	244	239					239	5
Allocation of losses of managed investment entities	0	(18)			(18)			18
Dividends on Common Stock	(39)	(39)				(39)
Shares issued:
Exercise of stock options, shares			669,921
Exercise of stock options	24	24		24
Other benefit plans, shares			217,423
Other benefit plans	7	7		7
Dividend reinvestment plan, shares			6,568
Stock-based compensation expense	9	9		9
Shares acquired and retired, shares			(765,074)
Shares acquired and retired	(44)	(44)		(11)		(33)
Shares exchanged - benefit plans, shares			(23,790)
Shares exchanged - benefit plans	(1)	(1)				(1)
Other	(1)							(1)
Ending Balance, shares at Jun. 30, 2014			89,618,434
Ending Balance at Jun. 30, 2014	$ 5,158	4,985		1,242	31	2,913	799	173
Beginning Balance, shares at Dec. 31, 2014	87,708,793		87,708,793
Beginning Balance at Dec. 31, 2014	$ 5,054	4,879		1,240	(2)	2,914	727	175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change for variable interest entities	2	2			2
Net earnings	174	160				160		14
Other comprehensive income (loss)	(166)	(164)					(164)	(2)
Dividends on Common Stock	(44)	(44)				(44)
Shares issued:
Exercise of stock options, shares			852,691
Exercise of stock options	34	34		34
Other benefit plans, shares			259,311
Other benefit plans	5	5		5
Dividend reinvestment plan, shares			7,041
Dividend reinvestment plan	0	0		0
Stock-based compensation expense	10	10		10
Shares acquired and retired, shares			(1,254,791)
Shares acquired and retired	(78)	(78)		(18)		(60)
Shares exchanged - benefit plans, shares			(32,633)
Shares exchanged - benefit plans	(2)	(2)				(2)
Other	$ (5)							(5)
Ending Balance, shares at Jun. 30, 2015	87,540,412		87,540,412
Ending Balance at Jun. 30, 2015	$ 4,984	$ 4,802		$ 1,271	$ 0	$ 2,968	$ 563	$ 182