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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | Selected quarterly financial data for the years ended December 31, 2016 and 2015 as reported, the effect of the change, and selected quarterly financial data for the years ended December 31, 2016 and 2015 as revised, are as follows (in millions, except per share data):
(As reported) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2016
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 2,787 |  |  | $ | 2,761 |  |  | $ | 2,740 |  |  | $ | 3,317 |  |  | $ | 11,605 |
Fiduciary investment income | 5 |  |  | 5 |  |  | 6 |  |  | 6 |  |  | 22 |
Total revenue | 2,792 |  |  | 2,766 |  |  | 2,746 |  |  | 3,323 |  |  | 11,627 |
Operating income | 450 |  |  | 405 |  |  | 422 |  |  | 629 |  |  | 1,906 |
Net income | 327 |  |  | 280 |  |  | 314 |  |  | 509 |  |  | 1,430 |
Less: Net income attributable to noncontrolling interests | 12 |  |  | 8 |  |  | 7 |  |  | 7 |  |  | 34 |
Net income attributable to Aon shareholders | $ | 315 |  |  | $ | 272 |  |  | $ | 307 |  |  | $ | 502 |  |  | $ | 1,396 |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders | $ | 1.16 |  |  | $ | 1.01 |  |  | $ | 1.15 |  |  | $ | 1.89 |  |  | $ | 5.21 |
Diluted net income per share attributable to Aon shareholders | $ | 1.15 |  |  | $ | 1.01 |  |  | $ | 1.14 |  |  | $ | 1.87 |  |  | $ | 5.16 |
(Effect of change) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2016
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 13 |  |  | $ | 34 |  |  | $ | 14 |  |  | $ | (61 | ) |  | $ | — |
Fiduciary investment income | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total revenue | 13 |  |  | 34 |  |  | 14 |  |  | (61 | ) |  | — |
Operating income | 13 |  |  | 34 |  |  | 14 |  |  | (61 | ) |  | — |
Net income | 10 |  |  | 28 |  |  | 12 |  |  | (50 | ) |  | — |
Less: Net income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net income attributable to Aon shareholders | $ | 10 |  |  | $ | 28 |  |  | $ | 12 |  |  | $ | (50 | ) |  | $ | — |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders | $ | 0.04 |  |  | $ | 0.11 |  |  | $ | 0.04 |  |  | $ | (0.19 | ) |  | $ | — |
Diluted net income per share attributable to Aon shareholders | $ | 0.04 |  |  | $ | 0.10 |  |  | $ | 0.04 |  |  | $ | (0.19 | ) |  | $ | — |
(As revised) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2016
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 2,800 |  |  | $ | 2,795 |  |  | $ | 2,754 |  |  | $ | 3,256 |  |  | $ | 11,605 |
Fiduciary investment income | 5 |  |  | 5 |  |  | 6 |  |  | 6 |  |  | 22 |
Total revenue | 2,805 |  |  | 2,800 |  |  | 2,760 |  |  | 3,262 |  |  | 11,627 |
Operating income | 463 |  |  | 439 |  |  | 436 |  |  | 568 |  |  | 1,906 |
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 | $ | 1.20 |  |  | $ | 1.12 |  |  | $ | 1.19 |  |  | $ | 1.70 |  |  | $ | 5.21 |
Diluted net income per share attributable to Aon shareholders | $ | 1.19 |  |  | $ | 1.11 |  |  | $ | 1.18 |  |  | $ | 1.68 |  |  | $ | 5.16 |
(As reported) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2015
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 2,842 |  |  | $ | 2,800 |  |  | $ | 2,736 |  |  | $ | 3,283 |  |  | $ | 11,661 |
Fiduciary investment income | 5 |  |  | 5 |  |  | 6 |  |  | 5 |  |  | 21 |
Total revenue | 2,847 |  |  | 2,805 |  |  | 2,742 |  |  | 3,288 |  |  | 11,682 |
Operating income | 441 |  |  | 277 |  |  | 413 |  |  | 717 |  |  | 1,848 |
Net income | 341 |  |  | 188 |  |  | 303 |  |  | 590 |  |  | 1,422 |
Less: Net income attributable to noncontrolling interests | 13 |  |  | 10 |  |  | 8 |  |  | 6 |  |  | 37 |
Net income attributable to Aon shareholders | $ | 328 |  |  | $ | 178 |  |  | $ | 295 |  |  | $ | 584 |  |  | $ | 1,385 |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders | $ | 1.15 |  |  | $ | 0.63 |  |  | $ | 1.05 |  |  | $ | 2.12 |  |  | $ | 4.93 |
Diluted net income per share attributable to Aon shareholders | $ | 1.14 |  |  | $ | 0.62 |  |  | $ | 1.04 |  |  | $ | 2.09 |  |  | $ | 4.88 |
(Effect of change) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2015
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 20 |  |  | $ | 31 |  |  | $ | 10 |  |  | $ | (61 | ) |  | $ | — |
Fiduciary investment income | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total revenue | 20 |  |  | 31 |  |  | 10 |  |  | (61 | ) |  | — |
Operating income | 20 |  |  | 31 |  |  | 10 |  |  | (61 | ) |  | — |
Net income | 16 |  |  | 26 |  |  | 8 |  |  | (50 | ) |  | — |
Less: Net income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net income attributable to Aon shareholders | $ | 16 |  |  | $ | 26 |  |  | $ | 8 |  |  | $ | (50 | ) |  | $ | — |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders | $ | 0.06 |  |  | $ | 0.09 |  |  | $ | 0.03 |  |  | $ | (0.18 | ) |  | $ | — |
Diluted net income per share attributable to Aon shareholders | $ | 0.06 |  |  | $ | 0.09 |  |  | $ | 0.03 |  |  | $ | (0.18 | ) |  | $ | — |
(As revised) | 1Q |  | 2Q |  | 3Q |  | 4Q |  | 2015
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ | 2,862 |  |  | $ | 2,831 |  |  | $ | 2,746 |  |  | $ | 3,222 |  |  | $ | 11,661 |
Fiduciary investment income | 5 |  |  | 5 |  |  | 6 |  |  | 5 |  |  | 21 |
Total revenue | 2,867 |  |  | 2,836 |  |  | 2,752 |  |  | 3,227 |  |  | 11,682 |
Operating income | 461 |  |  | 308 |  |  | 423 |  |  | 656 |  |  | 1,848 |
Net income | 357 |  |  | 214 |  |  | 311 |  |  | 540 |  |  | 1,422 |
Less: Net income attributable to noncontrolling interests | 13 |  |  | 10 |  |  | 8 |  |  | 6 |  |  | 37 |
Net income attributable to Aon shareholders | $ | 344 |  |  | $ | 204 |  |  | $ | 303 |  |  | $ | 534 |  |  | $ | 1,385 |
PER SHARE DATA |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders | $ | 1.21 |  |  | $ | 0.72 |  |  | $ | 1.08 |  |  | $ | 1.94 |  |  | $ | 4.93 |
Diluted net income per share attributable to Aon shareholders | $ | 1.20 |  |  | $ | 0.71 |  |  | $ | 1.07 |  |  | $ | 1.91 |  |  | $ | 4.88 |

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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=68076893&loc=d3e1280-108306 + Details
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