Table:
| FOR THE YEAR ENDED DECEMBER 31 | 2019 | 2018 |
| --- | --- | --- |
| Services (1) |  |  |
| Wireless | 6,427 | 6,269 |
| Wireline data | 7,684 | 7,466 |
| Wireline voice | 3,564 | 3,782 |
| Media | 2,811 | 2,677 |
| Other wireline services | 251 | 247 |
| Total services | 20,737 | 20,441 |
| Products (2) |  |  |
| Wireless | 2,660 | 2,497 |
| Wireline data | 519 | 466 |
| Wireline equipment and other | 48 | 64 |
| Total products | 3,227 | 3,027 |
| Total operating revenues | 23,964 | 23,468 |
Paragraphs:
REVENUES BY SERVICES AND PRODUCTS
The following table presents our revenues disaggregated by type of services and products.
(1) Our service revenues are generally recognized over time.
(2) Our product revenues are generally recognized at a point in time.
Question:
How are the service revenues generally recognized?
Answer: over time