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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ 3,256 | $ 2,754 | $ 2,795 | $ 2,800 | $ 3,222 | $ 2,746 | $ 2,831 | $ 2,862 |  |  | $ 11,605 | $ 11,661 | $ 12,019
Fiduciary investment income | 6 | 6 | 5 | 5 | 5 | 6 | 5 | 5 |  |  | 22 | 21 | 26
Total revenue | 3,262 | 2,760 | 2,800 | 2,805 | 3,227 | 2,752 | 2,836 | 2,867 |  |  | 11,627 | 11,682 | 12,045
Operating income | 568 | 436 | 439 | 463 | 656 | 423 | 308 | 461 |  |  | 1,906 | 1,848 | 1,966
Net income | 459 | 326 | 308 | 337 | 540 | 311 | 214 | 357 | $ 645 | $ 971 | 1,430 | 1,422 | 1,431
Less: Net income attributable to noncontrolling interests | 7 | 7 | 8 | 12 | 6 | 8 | 10 | 13 |  |  | 34 | 37 | 34
Net income attributable to Aon shareholders | $ 452 | $ 319 | $ 300 | $ 325 | $ 534 | $ 303 | $ 204 | $ 344 |  |  | $ 1,396 | $ 1,385 | $ 1,397
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders (in dollars per share) | $ 1.70 | $ 1.19 | $ 1.12 | $ 1.20 | $ 1.94 | $ 1.08 | $ 0.72 | $ 1.21 |  |  | $ 5.21 | $ 4.93 |
Diluted net income per share attributable to Aon shareholders (in dollars per share) | $ 1.68 | $ 1.18 | $ 1.11 | $ 1.19 | $ 1.91 | $ 1.07 | $ 0.71 | $ 1.20 |  |  | $ 5.16 | $ 4.88 |
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ 3,317 | $ 2,740 | $ 2,761 | $ 2,787 | $ 3,283 | $ 2,736 | $ 2,800 | $ 2,842 |  |  | $ 11,605 | $ 11,661 |
Fiduciary investment income | 6 | 6 | 5 | 5 | 5 | 6 | 5 | 5 |  |  | 22 | 21 |
Total revenue | 3,323 | 2,746 | 2,766 | 2,792 | 3,288 | 2,742 | 2,805 | 2,847 |  |  | 11,627 | 11,682 |
Operating income | 629 | 422 | 405 | 450 | 717 | 413 | 277 | 441 |  |  | 1,906 | 1,848 |
Net income | 509 | 314 | 280 | 327 | 590 | 303 | 188 | 341 | $ 607 | $ 921 | 1,430 | 1,422 |
Less: Net income attributable to noncontrolling interests | 7 | 7 | 8 | 12 | 6 | 8 | 10 | 13 |  |  | 34 | 37 |
Net income attributable to Aon shareholders | $ 502 | $ 307 | $ 272 | $ 315 | $ 584 | $ 295 | $ 178 | $ 328 |  |  | $ 1,396 | $ 1,385 |
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders (in dollars per share) | $ 1.89 | $ 1.15 | $ 1.01 | $ 1.16 | $ 2.12 | $ 1.05 | $ 0.63 | $ 1.15 |  |  | $ 5.21 | $ 4.93 |
Diluted net income per share attributable to Aon shareholders (in dollars per share) | $ 1.87 | $ 1.14 | $ 1.01 | $ 1.15 | $ 2.09 | $ 1.04 | $ 0.62 | $ 1.14 |  |  | $ 5.16 | $ 4.88 |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ (61) | $ 14 | $ 34 | $ 13 | $ (61) | $ 10 | $ 31 | $ 20 |  |  | $ 0 | $ 0 |
Fiduciary investment income | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  | 0 | 0 |
Total revenue | (61) | 14 | 34 | 13 | (61) | 10 | 31 | 20 |  |  | 0 | 0 |
Operating income | (61) | 14 | 34 | 13 | (61) | 10 | 31 | 20 |  |  | 0 | 0 |
Net income | (50) | 12 | 28 | 10 | (50) | 8 | 26 | 16 |  |  | 0 | 0 |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  | 0 | 0 |
Net income attributable to Aon shareholders | $ (50) | $ 12 | $ 28 | $ 10 | $ (50) | $ 8 | $ 26 | $ 16 |  |  | $ 0 | $ 0 |
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders (in dollars per share) | $ (0.19) | $ 0.04 | $ 0.11 | $ 0.04 | $ (0.18) | $ 0.03 | $ 0.09 | $ 0.06 |  |  | $ 0.00 | $ 0.00 |
Diluted net income per share attributable to Aon shareholders (in dollars per share) | $ (0.19) | $ 0.04 | $ 0.10 | $ 0.04 | $ (0.18) | $ 0.03 | $ 0.09 | $ 0.06 |  |  | $ 0.00 | $ 0.00 |

X
- Definition The sum of Commissions, Fees and Other Income. Commissions and fees reflects the total commissions and fees earned from providing services such as (1) brokerage and (2) other such services and activities performed for others. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References No definition available. + Details
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