Income per Share Income per Share (Tables)

12 Months Ended

Dec. 31, 2019

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	2019	2018	2017
Basic weighted average common shares outstanding	875	875	870
Dilutive effect of awards granted under our stock incentive plans	—	2	—
Diluted weighted average common shares outstanding	875	877	870
Antidilutive shares:
Options with exercise price greater than the average market price	24	14	6
Options which are antidilutive due to net loss position	1	—	2
Total antidilutive shares	25	14	8