Stock Compensation Plans (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 6	$ 6	$ 17	$ 15
Unearned compensation cost related to the unvested portion of all stock-based awards	$ 23		$ 23
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity instruments granted (shares)			2.1
Weighted average fair value per share granted (in dollars per share)			$ 9.73
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity instruments granted (shares)			1.0
Weighted average fair value per share granted (in dollars per share)			$ 9.31