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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | Selected quarterly financial data for the years ended December 31, 2017 and 2016 are as follows (in millions, except per share data):
| 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2017
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Total revenue | $ | 2,381 |  |  | $ | 2,368 |  |  | $ | 2,340 |  |  | $ | 2,909 |  |  | $ | 9,998 |
Operating income | 343 |  |  | (118 | ) |  | 265 |  |  | 489 |  |  | 979 |
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 |
| 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2016
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Total revenue | $ | 2,276 |  |  | $ | 2,282 |  |  | $ | 2,201 |  |  | $ | 2,650 |  |  | $ | 9,409 |
Operating income | 420 |  |  | 387 |  |  | 368 |  |  | 463 |  |  | 1,638 |
Net income from continuing operations | 312 |  |  | 273 |  |  | 284 |  |  | 384 |  |  | 1,253 |
Income from discontinued operations, net of tax | 25 |  |  | 35 |  |  | 42 |  |  | 75 |  |  | 177 |
Net income | 337 |  |  | 308 |  |  | 326 |  |  | 459 |  |  | 1,430 |
Less: Net income attributable to noncontrolling interests | 12 |  |  | 8 |  |  | 7 |  |  | 7 |  |  | 34 |
Net income attributable to Aon shareholders | $ | 325 |  |  | $ | 300 |  |  | $ | 319 |  |  | $ | 452 |  |  | $ | 1,396 |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |
Continuing operations | $ | 1.11 |  |  | $ | 0.99 |  |  | $ | 1.03 |  |  | $ | 1.42 |  |  | $ | 4.55 |
Discontinued operations | 0.09 |  |  | 0.13 |  |  | 0.16 |  |  | 0.28 |  |  | 0.66 |
Net income | $ | 1.20 |  |  | $ | 1.12 |  |  | $ | 1.19 |  |  | $ | 1.70 |  |  | $ | 5.21 |
Diluted net income per share attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |
Continuing operations | $ | 1.10 |  |  | $ | 0.98 |  |  | $ | 1.03 |  |  | $ | 1.40 |  |  | $ | 4.51 |
Discontinued operations | 0.09 |  |  | 0.13 |  |  | 0.15 |  |  | 0.28 |  |  | 0.65 |
Net income | $ | 1.19 |  |  | $ | 1.11 |  |  | $ | 1.18 |  |  | $ | 1.68 |  |  | $ | 5.16 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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