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Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock based compensation expense
Total stock-based compensation expense, before income taxes	$ 55	$ 23	$ 24
Income tax benefit	(14)	(6)	(6)
Total stock-based compensation expense, net of income taxes	41	17	18
Unrecognized compensation cost for all stock-based compensation awards	$ 42
Weighted average period for recognition of unrecognized compensation cost for all stock-based compensation awards	1 year 6 months
Tax benefit from exercise of stock options and other awards	$ 10
Selling, general and administrative expense
Stock based compensation expense
Total stock-based compensation expense, before income taxes	48	19	20
System operations expense
Stock based compensation expense
Total stock-based compensation expense, before income taxes	7	4	4
Long-Term Incentive Plans | Restricted Stock Units
Stock based compensation expense
Total stock-based compensation expense, before income taxes	30	20	18
Long-Term Incentive Plans | Performance Shares
Stock based compensation expense
Total stock-based compensation expense, before income taxes	24	2	5
Non-Employee Directors' Plan
Stock based compensation expense
Total stock-based compensation expense, before income taxes	$ 1	$ 1	$ 1

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

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