Stock Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 25	$ 20	$ 23
Deferred tax benefit related to compensation expense	4	3	4
Unamortized compensation expense related to stock options	$ 26
Unamortized compensation expense weighted-average recognition period	1 year 8 months 12 days
Deferred units, performance share units and other stock-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 121	100	98
Deferred tax benefit related to compensation expense	$ 18	$ 17	$ 16
Unamortized compensation expense weighted-average recognition period	1 year 8 months 12 days
Unamortized compensation expense related to DSUs, PSUs and other stock-based awards	$ 146
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)	243.7
Shares available to be granted (in shares)	41.5

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

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