Income (Loss) per Share (Tables)

6 Months Ended

Jun. 30, 2021

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	2021	2020	2021	2020
Basic weighted average common shares outstanding	890	877	889	877
Dilutive effect of awards granted under our stock incentive plans	—	—	—	—
Diluted weighted average common shares outstanding	890	877	889	877
Antidilutive shares:
Options with exercise price greater than the average market price	22	27	22	27
Options which are antidilutive due to net loss position	—	1	—	2
Total antidilutive shares	22	28	22	29