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Equity-Based Compensation - RSUs (Detail) - Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation
Unvested, Units, beginning of year	343,000
Granted, Units	162,000
Vested, Units	(107,000)
Forfeited, Units	(33,000)
Unvested, Units, end of year	365,000	343,000
Unvested, Weighted Average Per Share Fair Value, beginning of year	$ 114.28
Granted, Weighted Average Per Share Fair Value	147.74
Vested, Weighted Average Per Share Fair Value	100.11
Forfeited, Weighted Average Per Share Fair Value	136.43
Unvested, Weighted Average Per Share Fair Value, end of year	$ 131.26	$ 114.28
Total fair market value of vested awards	$ 15	$ 12	$ 14
Shares issued under the plan	77,000
Vested deferred units outstanding	30,000
Vesting period	3 years

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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