Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		24 Months Ended	0 Months Ended	1 Months Ended		3 Months Ended				33 Months Ended		3 Months Ended	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Jun. 16, 2010 Jun 2010 Share Repurchase Program Original Authorization [Member]	Sep. 30, 2012 Jun 2010 Share Repurchase Program Original Authorization [Member]	Apr. 30, 2011 Jun 2010 Share Repurchase Program Original Authorization [Member]	Mar. 31, 2013 Jun 2010 Share Repurchase Program Original Authorization [Member]		Mar. 31, 2012 Jun 2010 Share Repurchase Program Original Authorization [Member]		Mar. 31, 2013 Jun 2010 Share Repurchase Program Original Authorization [Member]		Mar. 31, 2011 Private Letter Ruling Limitation [Member]	Sep. 30, 2012 Maximum
Share Repurchase [Line Items]
Dilutive effect of of stock awards granted to employees under stock-based compensation plans	4.6	4.9
Anti-dilutive shares excluded from computation of earnings per share	1.3	2.8
Share Repurchases (Table Amounts)
Amount Authorized				$ 2,000,000,000							$ 5,350,000,000	[1]
Total Shares Retired											71.5	[1]
Average Price Per Share											$ 60.07	[1],[2]
Shares Repurchased							6.5	[1]	4.4	[1]
Increase authorized					2,000,000,000	4,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount														1,000,000,000
Share Repurchased Amount							4,300,000,000				4,300,000,000
Amount remaining under authorization for share repurchases							$ 1,000,000,000				$ 1,000,000,000
Share Repurchases (Amounts in Paragraphs)
Share Repurchase Limit Due to IRS Action													88
Period Of Share Repurchase Limit													2 years
Common stock repurchased during period			67
Common stock dividends per share, declared	$ 0.55	$ 0.50

[1] On June 16, 2010, the company's board of directors authorized a share repurchase program of up to $2.0 billion of the company’s common stock. Following this initial authorization, the board of directors increased the remaining repurchase authorization to $4.0 billion in April 2011. After further repurchases reduced the remaining authorization to less than $1 billion, the board of directors again increased the remaining authorization to $2.0 billion in September 2012. As of March 31, 2013, our repurchases under the program totaled $4.3 billion, and $1.0 billion remained under this share repurchase authorization. The repurchase program will expire when we have used all authorized funds for repurchase.

[2] Includes commissions paid.