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

3 Months Ended

Mar. 31, 2017

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	2017	2016
Basic weighted average common shares outstanding	867	858
Dilutive effect of awards granted under our stock incentive plans	—	—
Diluted weighted average common shares outstanding	867	858
Antidilutive shares:
Options with exercise price greater than the average market price	4	17
Options which are antidilutive due to net loss position	3	1
Total antidilutive shares	7	18