Summary of Stock Option Grants (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options grant shares
Outstanding at beginning of year	25.1	27.4	31.7
Granted	3.9	3.7	4.9
Exercised	(5.1)	(5.7)	(8.6)
Forfeited/expired	(0.5)	(0.3)	(0.6)
Outstanding at end of year	23.4	25.1	27.4
Exercisable at end of year	14.4	15.6	17.1
Stock options grant weighted-average exercise price
Outstanding at beginning of year	$ 69.15	$ 59.86	$ 47.77
Granted	$ 95.13	$ 94.36	$ 99.63
Exercised	$ 46.09	$ 40.12	$ 38.51
Forfeited/expired	$ 94.56	$ 79.15	$ 55.28
Outstanding at end of year	$ 77.99	$ 69.15	$ 59.86
Exercisable at end of year	$ 67.76
Stock options grant Weighted-average remaining contractual life
Outstanding at end of year	6 years 1 month 6 days
Exercisable at end of year	4 years 9 months 18 days
Stock options grant aggregate intrinsic value
Outstanding at end of year	$ 403.6
Exercisable at end of year	$ 389.9

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

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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