Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Average Common Shares Outstanding Basic and Diluted
Basic	344.2	348.8	344.3	349.6
Dilutive effect of stock options and restricted share unit awards	1.8	1.5	1.7	1.7
Diluted	346.0	350.3	346.0	351.3

[Line Items] for Average Common Shares Outstanding Basic and Diluted [Table]

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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