v2.4.0.6

Stockholders' Equity (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 entity | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2001 entity | Dec. 31, 2011 Continuing operations | Dec. 31, 2010 Continuing operations | Dec. 31, 2009 Continuing operations | Dec. 31, 2009 Discontinued operations | Oct. 31, 2010 Hewitt Associates, Inc (Hewitt) | Dec. 31, 2011 Hewitt Associates, Inc (Hewitt) | Dec. 31, 2010 Hewitt Associates, Inc (Hewitt) | Oct. 02, 2010 Hewitt Associates, Inc (Hewitt) | Jan. 31, 2010 2010 - Share Repurchase Program | Dec. 31, 2011 2010 - Share Repurchase Program | Dec. 31, 2011 2005 - Share Repurchase Program | Mar. 31, 2011 2005 - Share Repurchase Program Authorized Shares Adjustment | Dec. 31, 2007 2005 - Share Repurchase Program Authorized Shares Adjustment
Common Stock Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued as consideration for part of the purchase price of Hewitt |  |  |  |  |  |  |  |  |  | 61,050,000 |  |  |  |  |  |  |  |
Option to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |
Options outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |
Options exercisable |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |
Share repurchase authorization limit (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 | $ 1,200,000,000 |  |  | $ 4,600,000,000
Number of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,400,000 |  | 118,700,000 |
Average price per share of shares purchased under share repurchase program (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.39 |  | $ 40.97 |
Cost of shares repurchased (in dollars) |  | 828,000,000 | 250,000,000 | 590,000,000 |  |  |  |  |  |  |  |  |  |  | 827,000,000 |  | 4,600,000,000 |
Cumulative number of shares purchased under share repurchase programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,300,000 |  |
Cumulative value of shares purchased under share repurchase programs (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,400,000,000 |  |
Number of treasury shares reissued for employee benefit plans |  | 7,800,000 | 8,500,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock shares retired | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities acquired that returned shares of Aon common stock upon acquisition |  | 3 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Aon shares obtained upon acquisition of controlled entities |  |  |  |  | 22,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares reissued for employee stock purchase plans |  | 600,000 | 400,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares for basic earnings per share |  | 335,500,000 | 293,400,000 | 283,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potentially issuable common shares (in shares) |  | 5,400,000 | 4,700,000 | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares for diluted earnings per share |  | 340,900,000 | 298,100,000 | 291,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of participating securities (in shares) |  | 7,600,000 | 6,100,000 | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares excluded from the calculation of diluted earnings per share |  | 100,000 | 4,800,000 | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ 13,000,000 | $ 15,000,000 | $ 18,000,000 |  | $ 13,000,000 | $ 15,000,000 | $ 15,000,000 | $ (3,000,000) |  |  |  |  |  |  |  |  |
Number of shares issued for employee benefit plans |  | 500,000 | 2,200,000 | 1,000,000 |  |  |  |  |  |  | 2,200,000 | 500,000 |  |  |  |  |  |

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