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

6 Months Ended

Jun. 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 June 30				Six Months Ended June 30
Millions of shares	2018		2017		2018		2017
Basic weighted average common shares outstanding	877		869		876		868
Dilutive effect of awards granted under our stock incentive plans	3		2		3		—
Diluted weighted average common shares outstanding	880		871		879		868
Antidilutive shares:
Options with exercise price greater than the average market price	6		8		6		5
Options which are antidilutive due to net loss position	—		—		—		3
Total antidilutive shares	6		8		6		8

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- Definition

[Line Items] for Schedule for the basic and diluted weighted average common shares oustanding and securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.

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- Definition

[Table Text Block] for Schedule for the basic and diluted weighted average common shares oustanding and securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.

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