Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 3	$ 6	$ 19	$ 19
Unearned compensation cost related to the unvested portion of all stock-based awards	$ 19		$ 19
Remaining vesting period			through the third quarter of 2026
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity instruments granted (shares)			1.2
Weighted average fair value per share granted (dollars per share)			$ 11.43
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity instruments granted (shares)			0.4
Weighted average fair value per share granted (dollars per share)			$ 11.48