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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue |  |  |  |
Total revenue | $ 2,561 | $ 2,368 | $ 5,651 | $ 4,749
Expenses |  |  |  |
Compensation and benefits | 1,494 | 1,466 | 3,110 | 2,935
Other general expenses | 535 | 331 | 853 | 639
Other income (expense) | (3) | 4 | (18) | 2
Income tax benefit | (144) | (143) | (30) | (143)
Net income from continuing operations | $ 57 | $ (43) | $ 661 | $ 222
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ 0.19 | $ (0.20) | $ 2.57 | $ 0.75
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenue |  |  |  |
Total revenue | $ 2,564 |  | $ 5,241 |
Expenses |  |  |  |
Compensation and benefits | 1,481 |  | 3,032 |
Other general expenses | 537 |  | 855 |
Other income (expense) | (4) |  | (18) |
Income tax benefit | (137) |  | (105) |
Accounting Standards Update 2014-09 | Adjustments |  |  |  |
Revenue |  |  |  |
Total revenue | 3 |  | (410) |
Expenses |  |  |  |
Compensation and benefits | (13) |  | (78) |
Other general expenses | 2 |  | 2 |
Other income (expense) | (1) |  | 0 |
Income tax benefit | 7 |  | (75) |
Net income from continuing operations | $ (6) |  | $ 259 |
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ (0.02) |  | $ 1.05 |

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