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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | Selected quarterly financial data for the years ended December 31, 2018 and 2017 are as follows (in millions, except per share data):
| 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2018
Income Statement Data |  |  |  |  |  |  |  |  |
Total revenue | $ | 3,090 |  |  | $ | 2,561 |  |  | $ | 2,349 |  |  | $ | 2,770 |  |  | $ | 10,770 |
Operating income | 799 |  |  | (16 | ) |  | 262 |  |  | 499 |  |  | 1,544 |
Net income from continuing operations | 604 |  |  | 57 |  |  | 155 |  |  | 284 |  |  | 1,100 |
Income from discontinued operations, net of tax | 6 |  |  | 1 |  |  | (2 | ) |  | 69 |  |  | 74 |
Net income | 610 |  |  | 58 |  |  | 153 |  |  | 353 |  |  | 1,174 |
Less: Net income attributable to noncontrolling interests | 16 |  |  | 10 |  |  | 6 |  |  | 8 |  |  | 40 |
Net income attributable to Aon shareholders | $ | 594 |  |  | $ | 48 |  |  | $ | 147 |  |  | $ | 345 |  |  | $ | 1,134 |
Per Share Data |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |
Continuing operations | $ | 2.37 |  |  | $ | 0.19 |  |  | $ | 0.61 |  |  | $ | 1.14 |  |  | $ | 4.32 |
Discontinued operations | 0.02 |  |  | 0.01 |  |  | (0.01 | ) |  | 0.28 |  |  | 0.30 |
Net income | $ | 2.39 |  |  | $ | 0.20 |  |  | $ | 0.60 |  |  | $ | 1.42 |  |  | $ | 4.62 |
Diluted net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |
Continuing operations | $ | 2.35 |  |  | $ | 0.19 |  |  | $ | 0.61 |  |  | $ | 1.13 |  |  | $ | 4.29 |
Discontinued operations | 0.02 |  |  | — |  |  | (0.01 | ) |  | 0.28 |  |  | 0.30 |
Net income | $ | 2.37 |  |  | $ | 0.19 |  |  | $ | 0.60 |  |  | $ | 1.41 |  |  | $ | 4.59 |
| 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2017
Income Statement Data |  |  |  |  |  |  |  |  |
Total revenue | $ | 2,381 |  |  | $ | 2,368 |  |  | $ | 2,340 |  |  | $ | 2,909 |  |  | $ | 9,998 |
Operating income | 335 |  |  | (127 | ) |  | 256 |  |  | 601 |  |  | 1,065 |
Net income from continuing operations | 265 |  |  | (43 | ) |  | 196 |  |  | 17 |  |  | 435 |
Income from discontinued operations, net of tax | 40 |  |  | 821 |  |  | (4 | ) |  | (29 | ) |  | 828 |
Net income | 305 |  |  | 778 |  |  | 192 |  |  | (12 | ) |  | 1,263 |
Less: Net income attributable to noncontrolling interests | 14 |  |  | 9 |  |  | 7 |  |  | 7 |  |  | 37 |
Net income attributable to Aon shareholders | $ | 291 |  |  | $ | 769 |  |  | $ | 185 |  |  | $ | (19 | ) |  | $ | 1,226 |
Per Share Data |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.95 |  |  | $ | (0.20 | ) |  | $ | 0.74 |  |  | $ | 0.04 |  |  | $ | 1.54 |
Discontinued operations | 0.15 |  |  | 3.13 |  |  | (0.02 | ) |  | (0.12 | ) |  | 3.20 |
Net income | $ | 1.10 |  |  | $ | 2.93 |  |  | $ | 0.72 |  |  | $ | (0.08 | ) |  | $ | 4.74 |
Diluted net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.94 |  |  | $ | (0.20 | ) |  | $ | 0.73 |  |  | $ | 0.04 |  |  | $ | 1.53 |
Discontinued operations | 0.15 |  |  | 3.13 |  |  | (0.01 | ) |  | (0.11 | ) |  | 3.17 |
Net income | $ | 1.09 |  |  | $ | 2.93 |  |  | $ | 0.72 |  |  | $ | (0.07 | ) |  | $ | 4.70 |

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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=109225645&loc=d3e1280-108306 + Details
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