Stock Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 30	$ 25	$ 20
Deferred tax benefit related to compensation expense	5	4	3
Unamortized compensation expense related to stock options	$ 26
Unamortized compensation expense weighted-average recognition period	1 year 7 months 6 days
Deferred units, performance share units and other stock-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 117	121	100
Deferred tax benefit related to compensation expense	19	$ 18	$ 17
Unamortized compensation expense related to DSUs, PSUs and other stock-based awards	$ 132
Unamortized compensation expense weighted-average recognition period	1 year 7 months 6 days
2005 Plan \| Class A Common Stock, no par value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued under stock option plan (in shares)	50,700,000
Shares granted (in shares)	154,907
Shares forfeited (in shares)	391,513
Shares available to be granted (in shares)	50,900,000

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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