Earnings Per Share, Share Repurchases and Dividends on Common Stock #1 (Unaudited) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	9 Months Ended		39 Months Ended		0 Months Ended	5 Months Ended		9 Months Ended
	Sep. 30, 2013 June 2010 Share Repurchase Program Original Authorization	Sep. 30, 2012 June 2010 Share Repurchase Program Original Authorization	Sep. 30, 2013 June 2010 Share Repurchase Program Original Authorization		May 15, 2013 May 2013 Share Repurchase Program Original Authorization	Sep. 30, 2013 May 2013 Share Repurchase Program Original Authorization		Sep. 30, 2013 May 2013 Share Repurchase Program Original Authorization		Sep. 30, 2012 May 2013 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized			$ 5,350,000,000		$ 4,000,000,000	$ 4,000,000,000	[1]
Total Shares Retired			83.7			2.0	[1]
Average Cost Per Share			$ 63.86	[2]		$ 96.39	[1]
Shares Repurchased	18.6	13.6						2.0	[1]	0	[1]
Share Repurchases - Notes to Table
Shares repurchased amount						196,000,000		196,000,000
Amount remaining under authorization for share repurchases						$ 3,804,000,000		$ 3,804,000,000

[1] On May 15, 2013, the company's board of directors authorized a share repurchase program of up to $4.0 billion of the company’s common stock. Repurchases under this program commenced upon the completion of the company's 2010 repurchase program in September 2013. As of September 30, 2013, our repurchases under the program totaled $196 million, and $3.8 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.