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Deferred Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Contract with Customer, Liability [Abstract] |
Schedule of Deferred Revenue | As of December 31, 2019, we estimate that our deferred revenue will be recognized in the following years (in millions):
| Original Listing Revenues |  | Other Listing Revenues |  | Data Services and Other Revenues |  | Total
2020 | $ | 15 |  |  | $ | 31 |  |  | $ | 83 |  |  | $ | 129 |
2021 | 4 |  |  | 24 |  |  | 4 |  |  | 32 |
2022 | — |  |  | 21 |  |  | 1 |  |  | 22 |
2023 | — |  |  | 11 |  |  | — |  |  | 11 |
2024 | — |  |  | 6 |  |  | — |  |  | 6 |
Thereafter | — |  |  | 1 |  |  | — |  |  | 1 |
Total | $ | 19 |  |  | $ | 94 |  |  | $ | 88 |  |  | $ | 201 |
The changes in our deferred revenue during 2019 and 2018 are as follows (in millions):
| Annual Listing Revenue |  | Original Listing Revenues |  | Other Listing Revenues |  | Data Services and Other Revenues |  | Total
Deferred revenue balance at January 1, 2018 | $ | — |  |  | $ | 25 |  |  | $ | 98 |  |  | $ | 93 |  |  | $ | 216 |
Additions | 384 |  |  | 24 |  |  | 38 |  |  | 366 |  |  | 812 |
Amortization | (384 | ) |  | (24 | ) |  | (36 | ) |  | (367 | ) |  | (811 | )
Deferred revenue balance at December 31, 2018 | — |  |  | 25 |  |  | 100 |  |  | 92 |  |  | 217 |
Additions | 384 |  |  | 17 |  |  | 36 |  |  | 394 |  |  | 831 |
Amortization | (384 | ) |  | (23 | ) |  | (42 | ) |  | (398 | ) |  | (847 | )
Deferred revenue balance at December 31, 2019 | $ | — |  |  | $ | 19 |  |  | $ | 94 |  |  | $ | 88 |  |  | $ | 201 |

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration