Summary of Significant Accounting Policies - Revenue (Details) $ in Millions |
Dec. 31, 2024
USD ($)
|
|---|---|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Amount of China bank notes sold | $ 159 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Expected timing of satisfaction | 12 months |