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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 8 $ 7 $ 8
Income tax benefits $ 2 $ 2 $ 2
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted during the year 82,433 76,806 115,746
Shares vested during the year 75,107 75,007 44,829
Unvested shares at end of year 158,464 152,140 157,860
Unrecognized compensation expense at end of year (in thousands) $ 3 $ 3 $ 4
Total Shareholder Return Market-Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted during the year 45,739 34,912 69,814
Shares vested during the year 64,640 61,456 43,730
Shares earned based on market metrics 35,552 44,863 48,890
Unvested shares at end of year 77,530 96,915 130,567
Unrecognized compensation expense at end of year (in thousands) $ 2 $ 2 $ 4
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted during the year 137,161 104,685 69,814
Shares vested during the year 64,640 61,456 43,730
Shares earned based on market metrics 29,088 33,801  
Unvested shares at end of year 232,486 161,235 130,567
Unrecognized compensation expense at end of year (in thousands) $ 3 $ 2 $ 2