Earnings Per Share - Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings (loss) per share - basic:
Net Income (Loss)	$ (89)	$ 44	$ (398)	$ 306
Weighted average shares outstanding	285,000,000	284,000,000	285,000,000	284,000,000
Earnings (loss) per common share - basic	$ (0.31)	$ 0.16	$ (1.4)	$ 1.08
Earnings (loss) per share — diluted:
Net Income (Loss)	$ (89)	$ 44	$ (398)	$ 306
Weighted Average Shares Outstanding (Note 6)	285,000,000	284,000,000	285,000,000	284,000,000
Dilutive effect of stock options and other dilutive securities	0	2	0	2
Weighted average shares outstanding — diluted (in shares)	285,000,000	286,000,000	285,000,000	286,000,000
Earnings (loss) per common share - diluted	$ (0.31)	$ 0.16	$ (1.4)	$ 1.07