Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		39 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 04, 2018	Sep. 16, 2015
Share Repurchase [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0.6	0.9	0.6	1.0
September 2015 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized							$ 4,000
Shares Retired					13.0
Average Cost Per Share					$ 243.90
Shares Repurchased			1.7	0.2
Share Repurchases - Notes to Table
Shares repurchased amount					$ 3,200
Amount remaining under authorization for share repurchases	$ 800		$ 800		$ 800
December 2018 Share Repurchase Original Authorization [Member]
Share Repurchase [Line Items]
Amount Authorized						$ 3,000
Shares Retired			0.0
Average Cost Per Share			$ 0