Income (Loss) per Share

6 Months Ended

Jun. 30, 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 June 30		Six Months Ended June 30
Millions of shares	2019	2018	2019	2018
Basic weighted average common shares outstanding	874	877	874	876
Dilutive effect of awards granted under our stock incentive plans	1	3	—	3
Diluted weighted average common shares outstanding	875	880	874	879
Antidilutive shares:
Options with exercise price greater than the average market price	23	6	20	6
Total antidilutive shares	23	6	20	6