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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following table presents selected unaudited financial information for the eight quarters in the period ended December 31, 2019. The results for any quarter are not necessarily indicative of future quarterly results and, accordingly, period to period comparisons should not be relied upon as an indication of future performance.
|  | Three Months Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
|  | (in millions, except per share data) |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 376 |  |  | $ | 422 |  |  | $ | 428 |  |  | $ | 335 |
Operating income |  |  | 31 |  |  |  | 66 |  |  |  | 68 |  |  |  | 23 |
Net income |  |  | 26 |  |  |  | 34 |  |  |  | 50 |  |  |  | 15 |
Basic earnings per share (1) |  | $ | 0.19 |  |  | $ | 0.24 |  |  | $ | 0.36 |  |  | $ | 0.11 |
Diluted earnings per share (1) |  | $ | 0.18 |  |  | $ | 0.24 |  |  | $ | 0.36 |  |  | $ | 0.11 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 378 |  |  | $ | 433 |  |  | $ | 458 |  |  | $ | 346 |
Operating income |  |  | 23 |  |  |  | 49 |  |  |  | 89 |  |  |  | 23 |
Net income |  |  | 5 |  |  |  | 32 |  |  |  | 69 |  |  |  | 7 |
Basic earnings per share (1) |  | $ | 0.04 |  |  | $ | 0.23 |  |  | $ | 0.50 |  |  | $ | 0.05 |
Diluted earnings per share (1) |  | $ | 0.04 |  |  | $ | 0.23 |  |  | $ | 0.49 |  |  | $ | 0.05 |
(1) | Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly earnings per share may not equal the total computed for the year.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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