Equity Equity

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

Equity

Common Stock

The following table presents changes in the number of shares issued and outstanding.

Year ended December 31, (shares in thousands) (a)	2017		2016		2015
Common stock
Total issued at January 1,	485,708		482,791		480,136
New issuances
Employee benefits and compensation plans	4,176		2,917		2,655
Total issued at December 31,	489,884		485,708		482,791
Treasury balance at January 1,	(18,707	)	(811	)	(41	)
Repurchase of common stock (b) (c)	(34,122	)	(17,897	)	(769	)
Total treasury stock at December 31,	(52,830	)	(18,707	)	(811	)
Total outstanding at December 31,	437,054		467,000		481,980

(a) Figures in the table may not recalculate exactly due to rounding. Number of shares issued, in treasury, and outstanding are calculated based on unrounded numbers.

(b) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans.

(c) On July 19, 2016, we announced a common stock repurchase program of up to $700 million. The program commenced in the third quarter of 2016 and expired on June 30, 2017. On June 28, 2017, we announced a common stock repurchase program of up to $760 million. The program commenced in the third quarter of 2017 and will expire on June 30, 2018.