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Deferred Revenue (Tables) | 3 Months Ended
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Mar. 31, 2017
Deferred Revenue Disclosure [Abstract] |
Changes in Deferred Revenue | The changes in our deferred revenue during the three months ended March 31, 2017 and 2016 are reflected in the following table:
| Initial Listing Revenues |  | Listing of Additional Shares Revenues |  | Annual Renewal and Other Revenues |  | Market Technology Revenues |  | Total
| (in millions)
Balance at January 1, 2017 | $ | 54 |  |  | $ | 37 |  |  | $ | 57 |  |  | $ | 185 |  |  | $ | 333 |
Additions | 4 |  |  | 5 |  |  | 306 |  |  | 46 |  |  | 361 |
Amortization | (5 | ) |  | (9 | ) |  | (142 | ) |  | (55 | ) |  | (211 | )
Translation adjustment | — |  |  | — |  |  | — |  |  | 3 |  |  | 3 |
Balance at March 31, 2017 | $ | 53 |  |  | $ | 33 |  |  | $ | 221 |  |  | $ | 179 |  |  | $ | 486 |
Balance at January 1, 2016 | $ | 59 |  |  | $ | 53 |  |  | $ | 28 |  |  | $ | 187 |  |  | $ | 327 |
Additions | 1 |  |  | 2 |  |  | 314 |  |  | 67 |  |  | 384 |
Amortization | (4 | ) |  | (7 | ) |  | (143 | ) |  | (64 | ) |  | (218 | )
Translation adjustment | — |  |  | — |  |  | 1 |  |  | (2 | ) |  | (1 | )
Balance at March 31, 2016 | $ | 56 |  |  | $ | 48 |  |  | $ | 200 |  |  | $ | 188 |  |  | $ | 492 |
Estimated Deferred Revenue | At March 31, 2017, we estimate that our deferred revenue, which is primarily corporate services and market technology revenues, will be recognized in the following years:
| Initial Listing Revenues |  | Listing of Additional Shares Revenues |  | Annual Renewal and Other Revenues |  | Market Technology Revenues |  | Total
| (in millions)
Fiscal year ended: |  |  |  |  |  |  |  |
2017(1) | $ | 12 |  |  | $ | 15 |  |  | $ | 216 |  |  | $ | 58 |  |  | $ | 301 |
2018 | 14 |  |  | 11 |  |  | 4 |  |  | 38 |  |  | 67 |
2019 | 12 |  |  | 5 |  |  | 1 |  |  | 32 |  |  | 50 |
2020 | 8 |  |  | 2 |  |  | — |  |  | 30 |  |  | 40 |
2021 | 5 |  |  | — |  |  | — |  |  | 13 |  |  | 18 |
2022 and thereafter | 2 |  |  | — |  |  | — |  |  | 8 |  |  | 10 |
| $ | 53 |  |  | $ | 33 |  |  | $ | 221 |  |  | $ | 179 |  |  | $ | 486 |
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(1) | Represents deferred revenue that is anticipated to be recognized over the remaining nine months of 2017.

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 + Details
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