Earnings Per Share, Share Repurchases and Dividends on Common Stock #1 (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended		6 Months Ended				36 Months Ended		0 Months Ended	1 Months Ended		6 Months Ended				28 Months Ended
	Jun. 16, 2010 June 2010 Share Repurchase Program Original Authorization	Sep. 30, 2012 June 2010 Share Repurchase Program Original Authorization	Apr. 30, 2011 June 2010 Share Repurchase Program Original Authorization	Jun. 30, 2013 June 2010 Share Repurchase Program Original Authorization		Jun. 30, 2012 June 2010 Share Repurchase Program Original Authorization		Jun. 30, 2013 June 2010 Share Repurchase Program Original Authorization		May 15, 2013 May 2013 Share Repurchase Program Original Authorization	Jun. 30, 2013 May 2013 Share Repurchase Program Original Authorization		Jun. 30, 2013 May 2013 Share Repurchase Program Original Authorization		Jun. 30, 2012 May 2013 Share Repurchase Program Original Authorization		Sep. 30, 2012 Maximum
Share Repurchase [Line Items]
Amount Authorized	$ 2,000,000,000							$ 5,350,000,000	[1]	$ 4,000,000,000	$ 4,000,000,000	[2]
Total Shares Retired								77.6	[1]		0	[2]
Average Cost Per Share								$ 61.64	[1],[3]
Shares Repurchased				12.6	[1]	9.3	[1]						0	[2]	0	[2]
Share Repurchases - Notes to Table
Increase authorized		2,000,000,000	4,000,000,000
Remaining authorized repurchase amount (less than)																	1,000,000,000
Shares repurchased amount				4,800,000,000				4,800,000,000
Amount remaining under authorization for share repurchases				$ 557,000,000				$ 557,000,000

[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 ("2010 Repurchase Program"). As of June 30, 2013, our repurchases under the program totaled $4.8 billion, and $557 million remained under the 2010 Repurchase Program. The 2010 Repurchase Program will expire when we have used all authorized funds for repurchase.

[2] On May 15, 2013, the company's board of directors authorized a new share repurchase program of up to $4.0 billion of the company’s common stock ("2013 Repurchase Program"). Repurchases under the 2013 Repurchase Program will commence upon completion of the 2010 Repurchase Program.

[3] Includes commissions paid.