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Stock-based Compensation Plans - Options Outstanding and Option Exercisable (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding | shares	43,529
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years
Options Outstanding, Weighted- Average Exercise Price	$ 79.36
Options Exercisable | shares	31,046
Options Exercisable, Weighted-Average Exercise Price	$ 78.09
Exercise prices range $37.85 - $69.98
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	37.85
Exercise prices maximum range	$ 69.98
Options Outstanding | shares	6,859
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	3 years
Options Outstanding, Weighted- Average Exercise Price	$ 61.23
Options Exercisable | shares	5,736
Options Exercisable, Weighted-Average Exercise Price	$ 60.99
Exercise prices range $70.31 - $76.74
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	70.31
Exercise prices maximum range	$ 76.74
Options Outstanding | shares	10,579
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 1 month 6 days
Options Outstanding, Weighted- Average Exercise Price	$ 72.17
Options Exercisable | shares	10,144
Options Exercisable, Weighted-Average Exercise Price	$ 72.02
Exercise prices range $77.10 - $83.15
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	77.10
Exercise prices maximum range	$ 83.15
Options Outstanding | shares	8,095
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 6 months
Options Outstanding, Weighted- Average Exercise Price	$ 79.34
Options Exercisable | shares	2,851
Options Exercisable, Weighted-Average Exercise Price	$ 79.81
Exercise prices range $83.89 - $88.77
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	83.89
Exercise prices maximum range	$ 88.77
Options Outstanding | shares	9,644
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years
Options Outstanding, Weighted- Average Exercise Price	$ 85.88
Options Exercisable | shares	6,129
Options Exercisable, Weighted-Average Exercise Price	$ 85.00
Exercise prices range $90.00 - $114.83
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	90.00
Exercise prices maximum range	$ 114.83
Options Outstanding | shares	8,352
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 6 months
Options Outstanding, Weighted- Average Exercise Price	$ 95.86
Options Exercisable | shares	6,186
Options Exercisable, Weighted-Average Exercise Price	$ 96.24

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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