Income (Loss) per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Income (Loss) per Share

Income per Share

Basic income per share is based on the weighted average number of common shares outstanding during the period. Diluted income per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued. Antidilutive shares represent potential common shares which are excluded from the computation of diluted income per share as their impact would be antidilutive.

A reconciliation of the number of shares used for the basic and diluted income per share computations is as follows:

	Three Months Ended March 31
Millions of shares	2019	2018
Basic weighted average common shares outstanding	873	875
Dilutive effect of awards granted under our stock incentive plans	—	3
Diluted weighted average common shares outstanding	873	878
Antidilutive shares:
Options with exercise price greater than the average market price	20	7
Total antidilutive shares	20	7