Income (Loss) per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Weighted average shares outstanding and antidilutive shares

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