Earnings Per Share (Details) (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 December 19, 2007 Program - Total Authorization	Jun. 30, 2010 December 19, 2007 Program - Total Authorization	Jun. 30, 2011 June 16, 2010 Program - Original Authorization	Jun. 30, 2010 June 16, 2010 Program - Original Authorization	Apr. 11, 2011 June 16, 2010 Program - Original Authorization
Share Repurchases (Table Amounts)
Amount Authorized					$ 3,600,000,000		$ 4,245,000,000	$ 2,000,000,000
Average price per share			$ 65.02		$ 59.82		$ 63.33
Total shares retired					60,200,000		19,700,000
Shares repurchased			15,700,000	14,800,000	0	14,800,000	15,700,000
Share Repurchases (Amounts in Paragraphs)
Increase authorized							2,200,000,000
Amount remaining under authorization for share repurchases							3,000,000,000		4,000,000,000
Shares to be repurchased as part of accelerated share repurchase agreement	15,600,000		15,600,000
Shares to be repurchased as part of accelerated share repurchase agreement initial price per share			$ 64.17
Amount to be repurchased as part of accelerated share repurchase agreement	1,000,000,000		1,000,000,000
Diluted Earnings Per Share (Amounts in Paragraphs)
Dilutive effect of stock options and other stock awards granted	4,600,000	4,200,000	5,000,000	3,900,000
Antidilutive stock options	2,000,000	2,600,000	2,800,000	2,600,000
Number of shares purchased			7,900,000
Shares repurchased as part of accelerated share repurchase agreement percentage of total			51.00%
Amount the company would be required to pay if the Bank purchases the remaining shares at the share price as of June 30, 2011	$ 20,000,000		$ 20,000,000
Number of shares the company would be required to issue if the Bank purchases the remaining shares at the share price as of June 30, 2011	286,000		286,000