Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic:
Net income	$ 463	$ 837	$ 504
Weighted-average shares outstanding (in shares)	52,207,903	53,446,399	53,441,375
Basic earnings per share (in USD per share)	$ 8.86	$ 15.66	$ 9.43
Diluted:
Net income	$ 463	$ 837	$ 504
Weighted-average shares outstanding (in shares)	52,207,903	53,446,399	53,441,375
Diluted Shares (in shares)	350,809	456,031	471,870
Diluted weighted-average shares outstanding (in shares)	52,558,712	53,902,430	53,913,245
Diluted earnings per share (in USD per share)	$ 8.80	$ 15.52	$ 9.35