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Stock Compensation Plans - Purchased Restricted Stock Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of vested	$ 55
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted	$ 79
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted, weighted average period, in years	1 year 10 months 13 days
Purchased Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued Shares (in shares)	0	0	43,690
Aggregate Purchases	$ 0	$ 0	$ 6
Covered shares (in shares)	0	0	21,845
Total fair value of vested	$ 4
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted	$ 1
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted, weighted average period, in years	3 months 3 days

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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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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