Segment Information (Details) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
|
Sep. 30, 2025
USD ($)
|
Sep. 30, 2024
USD ($)
|
Sep. 30, 2025
USD ($)
segment
|
Sep. 30, 2024
USD ($)
|
Dec. 31, 2024
USD ($)
segment
|
Dec. 31, 2023
USD ($)
|
|
| Segment Information | ||||||
| Number of reportable segments | segment | 1 | |||||
| Total operating expenses | $ 131 | $ 136 | $ 384 | $ 399 | $ 539 | $ 524 |
| Single reportable segment | ||||||
| Segment Information | ||||||
| Number of reportable segments | segment | 1 | |||||
| Total operating expenses | 131 | 136 | 384 | 399 | $ 539 | 524 |
| Single reportable segment | Business | ||||||
| Segment Information | ||||||
| Total operating expenses | 31 | 32 | 83 | 95 | 127 | 120 |
| Single reportable segment | Consumer | ||||||
| Segment Information | ||||||
| Total operating expenses | 32 | 38 | 103 | 111 | 152 | 152 |
| Single reportable segment | Technology expense | ||||||
| Segment Information | ||||||
| Total operating expenses | $ 68 | $ 66 | $ 198 | $ 193 | $ 260 | $ 252 |