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

9 Months Ended

Sep. 30, 2016

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	2016	2015	2016	2015
Basic weighted average common shares outstanding	862	855	860	852
Dilutive effect of awards granted under our stock incentive plans	2	—	—	—
Diluted weighted average common shares outstanding	864	855	860	852
Antidilutive shares:
Options with exercise price greater than the average market price	12	13	13	10
Options which are antidilutive due to net loss position	—	2	1	2
Total antidilutive shares	12	15	14	12