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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenue |  |  |  |
Commissions, fees and other | $ 2,873 | $ 2,786 | $ 8,727 | $ 8,585
Fiduciary investment income | 7 | 8 | 19 | 21
Total revenue | 2,880 | 2,794 | 8,746 | 8,606
Expenses |  |  |  |
Compensation and benefits | 1,707 | 1,666 | 5,166 | 5,103
Other general expenses | 756 | 764 | 2,249 | 2,347
Total operating expenses | 2,463 | 2,430 | 7,415 | 7,450
Operating income | 417 | 364 | 1,331 | 1,156
Interest income | 3 | 3 | 7 | 6
Interest expense | (65) | (53) | (188) | (153)
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Other income | 35 | 39 | 34 | 54
Income before income taxes | 390 | 353 | 1,184 | 1,063
Income tax expense (benefit) | 75 | 89 | 220 | 275
Income (loss) before equity in earnings of subsidiaries | 315 | 264 | 964 | 788
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 315 | 264 | 964 | 788
Less: Net income attributable to noncontrolling interests | 6 | 8 | 26 | 30
Net income attributable to Aon shareholders | 309 | 256 | 938 | 758
Aon plc [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 0 | 1 | 0 | 2
Fiduciary investment income | 0 | 0 | 0 | 0
Total revenue | 0 | 1 | 0 | 2
Expenses |  |  |  |
Compensation and benefits | 4 | 11 | 29 | 27
Other general expenses | 6 | 0 | 18 | 14
Total operating expenses | 10 | 11 | 47 | 41
Operating income | (10) | (10) | (47) | (39)
Interest income | (2) | 0 | (6) | 1
Interest expense | (25) | (6) | (49) | (12)
Intercompany interest income (expense) | 113 | 25 | 335 | 11
Other income | 2 | 0 | 1 | 0
Income before income taxes | 78 | 9 | 234 | (39)
Income tax expense (benefit) | 16 | (2) | 49 | (11)
Income (loss) before equity in earnings of subsidiaries | 62 | 11 | 185 | (28)
Equity in earnings of subsidiaries, net of tax | 247 | 245 | 753 | 786
Net income | 309 | 256 | 938 | 758
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 309 | 256 | 938 | 758
Aon Corporation [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 0 | 0 | 0 | 0
Fiduciary investment income | 0 | 0 | 0 | 0
Total revenue | 0 | 0 | 0 | 0
Expenses |  |  |  |
Compensation and benefits | 5 | 14 | 19 | 34
Other general expenses | 14 | 5 | 37 | 29
Total operating expenses | 19 | 19 | 56 | 63
Operating income | (19) | (19) | (56) | (63)
Interest income | 1 | 1 | 1 | 2
Interest expense | (42) | (39) | (105) | (106)
Intercompany interest income (expense) | (73) | 11 | (220) | 96
Other income | 2 | 13 | 10 | 10
Income before income taxes | (131) | (33) | (370) | (61)
Income tax expense (benefit) | (52) | (14) | (144) | (24)
Income (loss) before equity in earnings of subsidiaries | (79) | (19) | (226) | (37)
Equity in earnings of subsidiaries, net of tax | 202 | 127 | 734 | 617
Net income | 123 | 108 | 508 | 580
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 123 | 108 | 508 | 580
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 2,873 | 2,785 | 8,727 | 8,583
Fiduciary investment income | 7 | 8 | 19 | 21
Total revenue | 2,880 | 2,793 | 8,746 | 8,604
Expenses |  |  |  |
Compensation and benefits | 1,698 | 1,641 | 5,118 | 5,042
Other general expenses | 736 | 759 | 2,194 | 2,304
Total operating expenses | 2,434 | 2,400 | 7,312 | 7,346
Operating income | 446 | 393 | 1,434 | 1,258
Interest income | 4 | 2 | 12 | 3
Interest expense | 2 | (8) | (34) | (35)
Intercompany interest income (expense) | (40) | (36) | (115) | (107)
Other income | 31 | 26 | 23 | 44
Income before income taxes | 443 | 377 | 1,320 | 1,163
Income tax expense (benefit) | 111 | 105 | 315 | 310
Income (loss) before equity in earnings of subsidiaries | 332 | 272 | 1,005 | 853
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 332 | 272 | 1,005 | 853
Less: Net income attributable to noncontrolling interests | 6 | 8 | 26 | 30
Net income attributable to Aon shareholders | 326 | 264 | 979 | 823
Consolidating Adjustments [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 0 | 0 | 0 | 0
Fiduciary investment income | 0 | 0 | 0 | 0
Total revenue | 0 | 0 | 0 | 0
Expenses |  |  |  |
Compensation and benefits | 0 | 0 | 0 | 0
Other general expenses | 0 | 0 | 0 | 0
Total operating expenses | 0 | 0 | 0 | 0
Operating income | 0 | 0 | 0 | 0
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Other income | 0 | 0 | 0 | 0
Income before income taxes | 0 | 0 | 0 | 0
Income tax expense (benefit) | 0 | 0 | 0 | 0
Income (loss) before equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries, net of tax | (449) | (372) | (1,487) | (1,403)
Net income | (449) | (372) | (1,487) | (1,403)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | $ (449) | $ (372) | $ (1,487) | $ (1,403)

X
- 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. + References No definition available. + Details
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