v2.4.0.6

Stockholders' Equity (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | $ 200 | $ 175 | $ 165
Cash dividends per share paid on common stock (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
Other comprehensive income (loss), pretax |  |  |  |  |  |  |  |  |  |  |
Net derivative gains arising during the year, pretax |  |  |  |  |  |  |  |  | (44) | (31) | 11
Reclassification adjustment, pretax |  |  |  |  |  |  |  |  | 25 | (5) | 10
Net change in derivative gains (losses), pretax |  |  |  |  |  |  |  |  | (19) | (36) | 21
Decrease in unrealized gains/losses, pretax |  |  |  |  |  |  |  |  |  |  | (17)
Reclassification adjustment, pretax |  |  |  |  |  |  |  |  |  |  | (2)
Net change in unrealized investment losses, pretax |  |  |  |  |  |  |  |  |  |  | (19)
Net foreign exchange translation adjustments, pretax |  |  |  |  |  |  |  |  | (46) | (92) | 198
Net post-retirement benefit obligation, pretax |  |  |  |  |  |  |  |  | (593) | (76) | (583)
Total other comprehensive loss, pretax |  |  |  |  |  |  |  |  | (658) | (204) | (383)
Less: other comprehensive income attributable to noncontrolling interest, pretax |  |  |  |  |  |  |  |  | 1 | (2) | 4
Other comprehensive loss attributable to Aon stockholders, pretax |  |  |  |  |  |  |  |  | (659) | (202) | (387)
Other comprehensive income (loss), income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  |
Net derivative gains arising during the year, income tax benefit (expense) |  |  |  |  |  |  |  |  | 15 | 10 | (4)
Reclassification adjustment, income tax benefit (expense) |  |  |  |  |  |  |  |  | (9) | 2 | (4)
Net change in derivative gains, income tax benefit (expense) |  |  |  |  |  |  |  |  | 6 | 12 | (8)
Decrease in unrealized gains/losses, income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  | 6
Reclassification adjustment, income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  | 1
Net change in unrealized investment losses, income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  | 7
Net foreign exchange translation adjustments, income tax benefit (expense) |  |  |  |  |  |  |  |  | 3 | (43) | 5
Net post-retirement benefit obligation, income tax benefit (expense) |  |  |  |  |  |  |  |  | 197 | 35 | 170
Total other comprehensive loss, income tax benefit (expense) |  |  |  |  |  |  |  |  | 206 | 4 | 174
Other comprehensive loss attributable to Aon stockholders, income tax benefit (expense) |  |  |  |  |  |  |  |  | 206 | 4 | 174
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net derivative gains arising during the year, net of tax |  |  |  |  |  |  |  |  | (29) | (21) | 7
Reclassification adjustment, net of tax |  |  |  |  |  |  |  |  | 16 | (3) | 6
Net change in derivative gains, net of tax |  |  |  |  |  |  |  |  | (13) | (24) | 13
Decrease in unrealized gains/losses, net of tax |  |  |  |  |  |  |  |  |  |  | (11)
Reclassification adjustment, net of tax |  |  |  |  |  |  |  |  |  |  | (1)
Net change in unrealized investment losses, net of tax |  |  |  |  |  |  |  |  |  |  | (12)
Net foreign exchange translation adjustments, net of tax |  |  |  |  |  |  |  |  | (43) | (135) | 203
Net post-retirement benefit obligation, net of tax |  |  |  |  |  |  |  |  | (396) | (41) | (413)
Total other comprehensive loss, net of tax |  |  |  |  |  |  |  |  | (452) | (200) | (209)
Less: other comprehensive income attributable to noncontrolling interest, net of tax |  |  |  |  |  |  |  |  | 1 | (2) | 4
Other comprehensive loss attributable to Aon stockholders, net of tax |  |  |  |  |  |  |  |  | $ (453) | $ (198) | $ (213)

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