Share-Based Payments (Components of share-based compensation expense) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense—total	[1]	$ 74	$ 60	$ 62
Tax benefit for share-based compensation expense		(9)	(8)	(8)
Share-based compensation expense, net of tax		65	52	54
Share-based compensation expense capitalized (less than)		$ 1	1	1
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 195.49
Deferred Stock Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Stock options / stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 11	8	10
RSUs / DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	[2]	$ 42	37	34
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		101,099
Share-based compensation expense		$ 21	$ 15	$ 18

[1] For each of the years ended December 31, 2024, 2023 and 2022, we capitalized up to $1 million of share-based compensation expense to inventory

[2]