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Income (Loss) per Share Income (Loss) per Share (Tables)
9 Months Ended
Sep. 30, 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
September 30
Nine Months Ended
September 30
Millions of shares
2017
2016
2017
2016
Basic weighted average common shares outstanding
872

862

869

860

Dilutive effect of awards granted under our stock incentive plans
1

2

3


Diluted weighted average common shares outstanding
873

864

872

860

 
 
 
 
 
Antidilutive shares:
 
 
 
 
Options with exercise price greater than the average market price
14

12

6

13

Options which are antidilutive due to net loss position



1

Total antidilutive shares
14

12

6

14