Income per Share Income per Share (Tables)

12 Months Ended

Dec. 31, 2020

Weighted average shares outstanding and antidilutive shares [Line Items]

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:

	Year Ended December 31
Millions of shares	2020	2019	2018
Basic weighted average common shares outstanding	881	875	875
Dilutive effect of awards granted under our stock incentive plans	—	—	2
Diluted weighted average common shares outstanding	881	875	877
Antidilutive shares:
Options with exercise price greater than the average market price	27	24	14
Options which are antidilutive due to net loss position	1	1	—
Total antidilutive shares	28	25	14