Income (Loss) per Share Income (Loss) per Share (Tables)

3 Months Ended

Mar. 31, 2018

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:

	Three Months Ended March 31
Millions of shares	2018	2017
Basic weighted average common shares outstanding	875	867
Dilutive effect of awards granted under our stock incentive plans	3	—
Diluted weighted average common shares outstanding	878	867
Antidilutive shares:
Options with exercise price greater than the average market price	7	4
Options which are antidilutive due to net loss position	—	3
Total antidilutive shares	7	7