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

6 Months Ended

Jun. 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 June 30		Six Months Ended June 30
Millions of shares	2016	2015	2016	2015
Basic weighted average common shares outstanding	860	852	859	851
Dilutive effect of awards granted under our stock incentive plans	—	2	—	—
Diluted weighted average common shares outstanding	860	854	859	851
Antidilutive shares:
Options with exercise price greater than the average market price	11	5	14	7
Options which ordinarily would be considered dilutive if not for being in net loss position	2	—	1	2
Total antidilutive shares	13	5	15	9