Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended		12 Months Ended	15 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Sep. 16, 2015	Dec. 04, 2014
December 2014 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized						$ 3,000
Shares Retired			18.0
Average Cost Per Share			$ 166.70
Shares Repurchased	0.0	1.4
September 2015 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized					$ 4,000
Shares Retired				7.3
Average Cost Per Share				$ 222.50
Shares Repurchased	1.5	2.0
Share Repurchases - Notes to Table
Shares repurchased amount				$ 1,600
Amount remaining under authorization for share repurchases	$ 2,400			$ 2,400