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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue |  |
Total revenue | $ 3,090 | $ 2,381
Expenses |  |
Compensation and benefits | 1,616 | 1,469
Other income (expense) | (15) | (2)
Income taxes | 114 | 0
Net income from continuing operations | $ 604 | $ 265
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ 2.37 | $ 0.95
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue |  |
Total revenue | $ 2,677 |
Expenses |  |
Compensation and benefits | 1,551 |
Other income (expense) | (14) |
Income taxes | 32 |
Accounting Standards Update 2014-09 | Adjustments |  |
Revenue |  |
Total revenue | (413) |
Expenses |  |
Compensation and benefits | (65) |
Other income (expense) | 1 |
Income taxes | (82) |
Net income from continuing operations | $ 265 |
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share) | $ 1.06 |

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