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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Consolidated Statements of Income | |||||||||||
| Commissions, fees and other | $ 2,980 | $ 2,708 | $ 2,799 | $ 2,748 | $ 2,897 | $ 1,786 | $ 1,883 | $ 1,891 | $ 11,235 | $ 8,457 | $ 7,521 |
| Fiduciary investment income | 14 | 15 | 12 | 11 | 12 | 15 | 15 | 13 | 52 | 55 | 74 |
| Total revenue | 2,994 | 2,723 | 2,811 | 2,759 | 2,909 | 1,801 | 1,898 | 1,904 | 11,287 | 8,512 | 7,595 |
| Operating income | 435 | 341 | 434 | 396 | 422 | 263 | 268 | 273 | 1,606 | 1,226 | 1,021 |
| Income from continuing operations | 280 | 208 | 265 | 253 | 242 | 147 | 184 | 186 | 1,006 | 759 | 681 |
| Loss from discontinued operations | 2 | 2 | (1) | (26) | 4 | (27) | 111 | ||||
| Net income | 280 | 208 | 267 | 255 | 241 | 147 | 158 | 186 | 1,010 | 732 | 792 |
| Less: Net income attributable to noncontrolling interests | 3 | 10 | 9 | 9 | 10 | 3 | 5 | 8 | 31 | 26 | 45 |
| Net income attributable to Aon stockholders | $ 277 | $ 198 | $ 258 | $ 246 | $ 231 | $ 144 | $ 153 | $ 178 | $ 979 | $ 706 | $ 747 |
| Basic: | |||||||||||
| lncome from continuing operations (in dollars per share) | $ 0.84 | $ 0.59 | $ 0.76 | $ 0.72 | $ 0.68 | $ 0.52 | $ 0.64 | $ 0.65 | $ 2.91 | $ 2.50 | $ 2.25 |
| Loss from discontinued operations (in dollars per share) | $ 0.01 | $ (0.09) | $ 0.01 | $ (0.09) | $ 0.39 | ||||||
| Net income (in dollars per share) | $ 0.85 | $ 0.59 | $ 0.76 | $ 0.72 | $ 0.68 | $ 0.52 | $ 0.55 | $ 0.65 | $ 2.92 | $ 2.41 | $ 2.64 |
| Diluted: | |||||||||||
| Income from continuing operations (in dollars per share) | $ 0.82 | $ 0.59 | $ 0.75 | $ 0.71 | $ 0.67 | $ 0.51 | $ 0.63 | $ 0.63 | $ 2.86 | $ 2.46 | $ 2.19 |
| Loss from discontinued operations (in dollars per share) | $ 0.01 | $ (0.09) | $ 0.01 | $ (0.09) | $ 0.38 | ||||||
| Net income (in dollars per share) | $ 0.83 | $ 0.59 | $ 0.75 | $ 0.71 | $ 0.67 | $ 0.51 | $ 0.54 | $ 0.63 | $ 2.87 | $ 2.37 | $ 2.57 |
| COMMON STOCK DATA | |||||||||||
| Dividends paid per share (in dollars per share) | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.60 | $ 0.60 | $ 0.60 |
| Price range: | |||||||||||
| High (in dollars per share) | $ 51.11 | $ 52.17 | $ 54.58 | $ 53.17 | $ 46.24 | $ 40.08 | $ 44.34 | $ 43.16 | $ 54.58 | $ 46.24 | |
| Low (in dollars per share) | $ 39.90 | $ 39.68 | $ 48.66 | $ 43.31 | $ 38.72 | $ 35.10 | $ 37.06 | $ 37.33 | $ 39.68 | $ 35.10 | |
| Shares outstanding (in shares) | 324.4 | 323.3 | 326.7 | 330.5 | 332.3 | 270.9 | 269.7 | 269.4 | 324.4 | 332.3 | |
| Average monthly trading volume (in shares) | 54.4 | 80.3 | 38.7 | 37.2 | 52.7 | ||||||
| X | ||||||||||
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- Definition
The sum of Commissions, Fees and Other Income. Commissions and fees reflects the total commissions and fees earned from providing services such as (1) brokerage and (2) other such services and activities performed for others. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Represents the average monthly trading volume of common stock. No definition available.
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- Definition
Represents the maximum price per share of common stock. No definition available.
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| X | ||||||||||
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- Definition
Represents the minimum price per share of common stock. No definition available.
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- Details
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- Definition
Income earned on the interest-bearing assets used as temporary investments of premiums collected from insured's but not yet remitted to insurance companies. No definition available.
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- Definition
Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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