Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 3	$ 5
Unearned compensation cost related to the unvested portion of all stock-based awards	$ 35
Remaining vesting period	through the first quarter of 2027
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity instruments granted (shares)	1.6
Weighted average fair value per share granted (dollars per share)	$ 12.33
Performance Share 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)	$ 11.45