Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($) $ in Millions  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023  | 
Dec. 31, 2022  | 
Dec. 31, 2021  | 
|
| Selling, general and administrative | |||
| Advertising expense | $ 5 | $ 4 | $ 5 | 
| X | ||||||||||
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Details 
  |