Earnings Per Share, Share Repurchases and Dividends on Common Stock (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			24 Months Ended	12 Months Ended			39 Months Ended	0 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 IRS Private Letter Ruling	Dec. 31, 2013 June 2010 Share Repurchase Program Original Authorization	Dec. 31, 2012 June 2010 Share Repurchase Program Original Authorization	Dec. 31, 2011 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	Dec. 31, 2013 May 2013 Share Repurchase Program Original Authorization	Dec. 31, 2013 May 2013 Share Repurchase Program Original Authorization	Dec. 31, 2012 May 2013 Share Repurchase Program Original Authorization	Dec. 31, 2011 May 2013 Share Repurchase Program Original Authorization
Stock Repurchase [Line Items]
Amount Authorized								$ 5,350,000,000	$ 4,000,000,000	$ 4,000,000,000
Total shares retired								83.7		8.7
Treasury Stock Acquired, Average Cost Per Share								$ 63.86		$ 103.37
Share repurchase limit due to IRS action				88
Period of share repurchase limit				2 years
Shares repurchased	27.3	20.9	40.2	67.0	18.6	20.9	40.2				8.7	0	0
Share Repurchases-Notes to the Table
Amount repurchased										895,000,000	895,000,000
Amount remaining under authorization for share repurchases										$ 3,100,000,000	$ 3,100,000,000