Earnings Per Share, Share Repurchases and Dividends on Common Stock #1 (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		22 Months Ended	4 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2015	May 15, 2013	Dec. 04, 2014
May 2013 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized					$ 4,000
Total Shares Retired			32.8
Average Cost Per Share			$ 121.97
Shares Repurchased	2.7	4.8
December 2014 Share Repurchase Original Authorization [Domain]
Share Repurchase [Line Items]
Amount Authorized						3,000
Total Shares Retired				2.6
Average Cost Per Share				$ 161.18
Shares Repurchased	2.6	0
Share Repurchases - Notes to Table
Shares repurchased amount	400		400	400
Amount remaining under authorization for share repurchases	2,600		$ 2,600	$ 2,600