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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Consolidating Statement of Income |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other revenue | $ 3,283 | $ 2,736 | $ 2,800 | $ 2,842 | $ 3,292 | $ 2,873 | $ 2,913 | $ 2,941 | $ 11,661 | $ 12,019 | $ 11,787
Fiduciary investment income | 5 | 6 | 5 | 5 | 7 | 7 | 6 | 6 | 21 | 26 | 28
Total revenue | 3,288 | 2,742 | 2,805 | 2,847 | 3,299 | 2,880 | 2,919 | 2,947 | 11,682 | 12,045 | 11,815
Operating income | 717 | 413 | 277 | 441 | 635 | 417 | 445 | 469 | 1,848 | 1,966 | 1,671
Net income | 590 | 303 | 188 | 341 | 467 | 315 | 313 | 336 | 1,422 | 1,431 | 1,148
Less: Net income attributable to noncontrolling interests | 6 | 8 | 10 | 13 | 8 | 6 | 9 | 11 | 37 | 34 | 35
Net income attributable to Aon shareholders | $ 584 | $ 295 | $ 178 | $ 328 | $ 459 | $ 309 | $ 304 | $ 325 | $ 1,385 | $ 1,397 | $ 1,113
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |
Basic net income per share attributable to Aon shareholders (in dollar per share) | $ 2.12 | $ 1.05 | $ 0.63 | $ 1.15 | $ 1.60 | $ 1.06 | $ 1.02 | $ 1.07 | $ 4.93 | $ 4.73 |
Diluted net income per share attributable to Aon shareholders (in dollars per share) | 2.09 | 1.05 | 0.62 | 1.14 | 1.56 | 1.04 | 1.01 | 1.06 | 4.88 | 4.66 |
CLASS A ORDINARY SHARE DATA |  |  |  |  |  |  |  |  |  |  |
Dividends paid per share (in dollars per share) | 0.30 | 0.30 | 0.30 | 0.25 | 0.25 | 0.25 | 0.25 | 0.18 | 1.15 | 0.92 | $ 0.68
Price range: |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | 97.79 | 103.38 | 104.70 | 107.08 | 98.1 | 91.28 | 91.07 | 87.45 | 107.08 | 98.1 |
Low (in dollars per share) | $ 86.38 | $ 87.58 | $ 95.32 | $ 89.35 | $ 78.26 | $ 83.06 | $ 78.6 | $ 76.49 | $ 86.38 | $ 76.49 |
Shares outstanding (in shares) | 269.8 | 273.9 | 279.8 | 281.7 | 280.0 | 285.1 | 290.5 | 296.5 | 269.8 | 280.0 |
Average monthly trading volume (in shares) | 26.6 | 26.5 | 24.9 | 24.5 | 34.1 | 26.3 | 28.5 | 32.6 | 25.6 | 30.4 |

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