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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenue |  |  |  |
Commissions, fees and other | $ 2,913 | $ 2,891 | $ 5,854 | $ 5,799
Fiduciary investment income | 6 | 6 | 12 | 13
Total revenue | 2,919 | 2,897 | 5,866 | 5,812
Expenses |  |  |  |
Compensation and benefits | 1,708 | 1,712 | 3,459 | 3,437
Other general expenses | 766 | 803 | 1,493 | 1,583
Total operating expenses | 2,474 | 2,515 | 4,952 | 5,020
Operating income | 445 | 382 | 914 | 792
Interest income | 2 | 2 | 4 | 3
Interest expense | (65) | (48) | (123) | (100)
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Other (expense) income | (2) | 6 | (1) | 15
Income before income taxes | 380 | 342 | 794 | 710
Income tax expense (benefit) | 67 | 90 | 145 | 186
Income (loss) before equity in earnings of subsidiaries | 313 | 252 | 649 | 524
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 313 | 252 | 649 | 524
Less: Net income attributable to noncontrolling interests | 9 | 11 | 20 | 22
Net income attributable to Aon shareholders | 304 | 241 | 629 | 502
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 | 34 | 4 | 45 | 15
Other general expenses | 5 | 9 | 13 | 16
Total operating expenses | 39 | 13 | 58 | 31
Operating income | (39) | (12) | (58) | (29)
Interest income | (2) | 0 | (4) | 0
Interest expense | (15) | (4) | (25) | (6)
Intercompany interest income (expense) | 111 | (7) | 222 | (14)
Other (expense) income | (1) | 0 | (1) | 0
Income before income taxes | 54 | (23) | 134 | (49)
Income tax expense (benefit) | 7 | (3) | 28 | (9)
Income (loss) before equity in earnings of subsidiaries | 47 | (20) | 106 | (40)
Equity in earnings of subsidiaries, net of tax | 257 | 261 | 523 | 542
Net income | 304 | 241 | 629 | 502
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 304 | 241 | 629 | 502
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 | 6 | 6 | 15 | 21
Other general expenses | 7 | 16 | 22 | 23
Total operating expenses | 13 | 22 | 37 | 44
Operating income | (13) | (22) | (37) | (44)
Interest income | 0 | 1 | 1 | 1
Interest expense | (32) | (33) | (63) | (67)
Intercompany interest income (expense) | (73) | 43 | (147) | 86
Other (expense) income | 8 | (2) | 8 | (3)
Income before income taxes | (110) | (13) | (238) | (27)
Income tax expense (benefit) | (42) | (6) | (92) | (11)
Income (loss) before equity in earnings of subsidiaries | (68) | (7) | (146) | (16)
Equity in earnings of subsidiaries, net of tax | 267 | 234 | 549 | 489
Net income | 199 | 227 | 403 | 473
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 199 | 227 | 403 | 473
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 2,913 | 2,890 | 5,854 | 5,797
Fiduciary investment income | 6 | 6 | 12 | 13
Total revenue | 2,919 | 2,896 | 5,866 | 5,810
Expenses |  |  |  |
Compensation and benefits | 1,668 | 1,702 | 3,399 | 3,401
Other general expenses | 754 | 778 | 1,458 | 1,544
Total operating expenses | 2,422 | 2,480 | 4,857 | 4,945
Operating income | 497 | 416 | 1,009 | 865
Interest income | 4 | 1 | 7 | 2
Interest expense | (18) | (11) | (35) | (27)
Intercompany interest income (expense) | (38) | (36) | (75) | (72)
Other (expense) income | (9) | 8 | (8) | 18
Income before income taxes | 436 | 378 | 898 | 786
Income tax expense (benefit) | 102 | 99 | 209 | 206
Income (loss) before equity in earnings of subsidiaries | 334 | 279 | 689 | 580
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 334 | 279 | 689 | 580
Less: Net income attributable to noncontrolling interests | 9 | 11 | 20 | 22
Net income attributable to Aon shareholders | 325 | 268 | 669 | 558
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 (expense) 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 | (524) | (495) | (1,072) | (1,031)
Net income | (524) | (495) | (1,072) | (1,031)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | $ (524) | $ (495) | $ (1,072) | $ (1,031)

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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