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

9 Months Ended

Sep. 30, 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 September 30		Nine Months Ended September 30
Millions of shares	2018	2017	2018	2017
Basic weighted average common shares outstanding	877	872	876	869
Dilutive effect of awards granted under our stock incentive plans	1	1	3	3
Diluted weighted average common shares outstanding	878	873	879	872
Antidilutive shares:
Options with exercise price greater than the average market price	15	14	7	6
Total antidilutive shares	15	14	7	6