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Accounting Principles and Practices - Schedule of Impact of Topic 606 on Statement of Income (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue |  |  |  |
Total revenue | $ 2,349 | $ 2,340 | $ 8,000 | $ 7,089
Expenses |  |  |  |
Compensation and benefits | 1,392 | 1,428 | 4,502 | 4,363
Other general expenses | 336 | 317 | 1,189 | 956
Income tax expense (benefit) | 39 | 4 | 9 | (139)
Net income from continuing operations | $ (155) | $ (196) | $ (816) | $ (418)
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ 0.61 | $ 0.74 | $ 3.18 | $ 1.49
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenue |  |  |  |
Total revenue | $ 2,491 |  | $ 7,732 |
Expenses |  |  |  |
Compensation and benefits | 1,428 |  | 4,460 |
Other general expenses | 337 |  | 1,192 |
Income tax expense (benefit) | 60 |  | (45) |
Accounting Standards Update 2014-09 | Adjustments |  |  |  |
Revenue |  |  |  |
Total revenue | 142 |  | (268) |
Expenses |  |  |  |
Compensation and benefits | 36 |  | (42) |
Other general expenses | 1 |  | 3 |
Income tax expense (benefit) | 21 |  | (54) |
Net income from continuing operations | $ 84 |  | $ (175) |
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ 0.34 |  | $ 0.71 |

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