Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2011	2010	2009
	(Shares in thousands)
Income available to common  shareholders	$4,347.7	$5,069.5	$4,328.8
Basic earnings per share
Weighted-average number of common shares     outstanding, including incremental shares	1,113,923	1,105,788	1,098,338
Basic earnings per share	$3.90	$4.58	$3.94
Diluted earnings per share
Weighted-average number of common     shares outstanding	1,107,112	1,099,310	1,094,623
Stock options and other incremental shares	6,855	6,503	3,744
Weighted-average number of common     shares outstanding - diluted	1,113,967	1,105,813	1,098,367
Diluted earnings per share	$3.90	$4.58	$3.94