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Stock Based Compensation - Summary of Stock Option and Stock Appreciation Rights ("SARs") Restricted Stock Units ("RSUs") and Performance Stock Units ("PSU") Activity (Detail) shares in Millions	6 Months Ended
	Jun. 30, 2024 shares
Stock Options and SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding Opening	38.8
Granted	1.8
Cancelled/forfeited	(1.1)
Exercised	(2.4)
Vested	0.0
Number of Shares, Outstanding Closing	37.1
PSUs and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	3.4
Number of Shares, Outstanding Opening	3.5
Cancelled/forfeited	(0.9)
Exercised	0.0
Vested	(0.7)
Number of Shares, Outstanding Closing	5.3

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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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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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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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