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Nasdaq Stockholders’ Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Common Stock in Treasury, at Cost | The following table summarizes our share repurchase activity:
|  | Nine Months Ended September 30,
|  | 2018 |  | 2017
Number of shares of common stock repurchased |  | 4,508,426 |  |  | 2,455,171 |
Average price paid per share |  | $ | 87.43 |  |  | $ | 71.15 |
Total purchase price (in millions) |  | $ | 394 |  |  | $ | 175 |
Schedule of Dividends Declared | During the nine months ended September 30, 2018, our board of directors declared the following cash dividends:
Declaration Date |  | Dividend Per Common Share |  | Record Date |  | Total Amount Paid |  | Payment Date
|  |  |  |  |  | (in millions) |  |
January 30, 2018 |  | $ | 0.38 |  |  | March 16, 2018 |  | $ | 63 |  |  | March 30, 2018
March 26, 2018 |  | 0.44 |  |  | June 15, 2018 |  | 73 |  |  | June 29, 2018
July 24, 2018 |  | 0.44 |  |  | September 14, 2018 |  | 72 |  |  | September 28, 2018
|  |  |  |  |  | $ | 208 |  |  |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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