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Deferred Revenue (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Schedule of Changes in Deferred Revenue | The changes in our deferred revenue during the nine months ended September 30, 2019 are as follows (in millions):
| Annual Listings Revenues |  | Original Listings Revenues |  | Other Listings Revenues |  | Data Services and Other Revenues |  | Total
Deferred revenue balance at December 31, 2018 | $ | — |  |  | $ | 25 |  |  | $ | 100 |  |  | $ | 92 |  |  | $ | 217 |
Additions | 387 |  |  | 11 |  |  | 30 |  |  | 300 |  |  | 728 |
Amortization | (289 | ) |  | (17 | ) |  | (30 | ) |  | (277 | ) |  | (613 | )
Deferred revenue balance at September 30, 2019 | $ | 98 |  |  | $ | 19 |  |  | $ | 100 |  |  | $ | 115 |  |  | $ | 332 |
The changes in our deferred revenue during the nine months ended September 30, 2018 are as follows (in millions):
| Annual Listings Revenues |  | Original Listings Revenues |  | Other Listings Revenues |  | Data Services and Other Revenues |  | Total
Deferred revenue balance at December 31, 2017 | $ | — |  |  | $ | 25 |  |  | $ | 98 |  |  | $ | 93 |  |  | $ | 216 |
Additions | 383 |  |  | 17 |  |  | 36 |  |  | 291 |  |  | 727 |
Amortization | (288 | ) |  | (17 | ) |  | (27 | ) |  | (272 | ) |  | (604 | )
Deferred revenue balance at September 30, 2018 | $ | 95 |  |  | $ | 25 |  |  | $ | 107 |  |  | $ | 112 |  |  | $ | 339 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- References No definition available. + Details
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