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Number of shares authorized for issuance under share-based payment arrangement.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended				288 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2016	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of incentive compensation to acquire shares, maximum	50.00%
Percentage of discount rate to market value on the incentive compensation	20.00%
Common stock price	$ 516.5				$ 516.5
Awards available for grant	300,000				300,000
Additional shares issuance under the plan				800,000
Total tax benefits related to stock-based compensation expense	$ 9	$ 9	$ 8
Options granted in 2015 and 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Incentive Compensation Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 548.68	$ 362.08	$ 369.05
Aggregate intrinsic values for stock awards	$ 2				$ 2
Common stock price	$ 516.5				$ 516.5
Aggregate intrinsic values of stock awards, distributed	$ 4	$ 4	$ 3
Awards granted	11,543
Restricted Stock - Service Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 553.17	$ 369.18	$ 362.77
Awards granted	46,323
Restricted Stock - Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 595	$ 392.73	$ 406.99
Awards granted	29,746
Service and Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic values for stock awards	$ 145				$ 145
Aggregate intrinsic values of stock awards, distributed	$ 76	$ 48	$ 65
Shareholder Value Achievement Plan (1996)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	200,000				200,000
Awards granted					0
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	300,000				300,000
Common stock issued under the plan	834	1,333	1,767