Income (Loss) per Share (Tables)

9 Months Ended

Sep. 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 September 30		Nine Months Ended September 30
Millions of shares	2021	2020	2021	2020
Basic weighted average common shares outstanding	894	882	891	879
Dilutive effect of awards granted under our stock incentive plans	—	—	—	—
Diluted weighted average common shares outstanding	894	882	891	879
Antidilutive shares:
Options with exercise price greater than the average market price	21	26	22	27
Options which are antidilutive due to net loss position	—	1	—	1
Total antidilutive shares	21	27	22	28