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Stock-Based Compensation Plans - Stock Option Exercises and Restricted Stock Vesting (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Proceeds from stock option exercises	$ 53	$ 32	$ 8
Aggregate intrinsic value	76	58	9
Tax benefit realized upon exercise	13	14	2
Restricted Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Fair value of shares vested	199	164	180
Tax benefit realized upon vesting	48	40	42
Performance Based Restricted Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Fair value of shares vested	40	24	50
Tax benefit realized upon vesting	$ 9	$ 3	$ 7

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- Definition

Amount of tax benefit from vesting of other than stock options granted under share-based compensation arrangement.

+ References

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Amount of tax benefit from exercise of option under share-based payment arrangement.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2A
-Subparagraph (a)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2A

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
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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.

+ References

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-Topic 718
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-Name Accounting Standards Codification
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-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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