Stock Compensation Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Restricted stock units	$ 8	$ 11	$ 16	$ 21
Employee stock purchase plan	1	1	2	2
Stock-based compensation expense	9	12	18	23
Tax expense (benefit)	(1)	1	1	0
Stock-based compensation expense (net of tax)	$ 8	$ 13	$ 19	$ 23

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

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The amount of plan compensation cost recognized during the period.

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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