Stock-Based Compensation - Weighted Average Assumptions Used to Estimate Fair Values (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Aug. 31, 2019	Aug. 31, 2018
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share of the options granted (in dollars per share)	$ 18.33	$ 17.44
Dividend yield	1.10%	1.00%
Expected volatility	22.90%	19.70%
Weighted average expected life	6 years	6 years
Risk-free interest rate	1.70%	2.90%
Stock Incentive Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs from stock options	$ 320
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period (in years)	2 years 7 months 6 days
Class B Common Stock \| Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum term of market traded options for estimates of expected volatility	1 year

Minimum Term of Market Traded Options For Estimates of Expected Volatility

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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