Capital Stock (Summary Of Stock Option Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Number of Shares
Outstanding at beginning of period, Number of Shares	17.8
Granted, Number of Shares	2.0
Exercised, Number of Shares	(8.4)
Forfeited or expired, Number of Shares	(1.4)
Outstanding at end of period, Number of Shares	10.0
Exercisable at end of period, Number of Shares	7.6
Weighted-Average Option Price per Share
Outstanding at beginning of period, Weighted-Average Option Price per Share	$ 64.67
Granted, Weighted-Average Option Price per Share	$ 62.55
Exercised, Weighted-Average Option Price per Share	$ 62.34
Forfeited or expired, Weighted-Average Option Price per Share	$ 70.77
Outstanding at end of period, Weighted-Average Option Price per Share	$ 65.38
Exercisable at end of period, Weighted-Average Option Price per Share	$ 66.04
Outstanding at end of period, Weighted-Average Remaining Contractual Life	3 years 4 months
Exercisable at end of period, Weighted-Average Remaining Contractual Life	2 years 7 months
Outstanding at end of period, Aggregate Intrinsic Value	$ 270.9
Exercisable at end of period, Aggregate Intrinsic Value	$ 199.9

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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