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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Revenue |  |
Commissions, fees and other | $ 2,941 | $ 2,908
Fiduciary investment income | 6 | 7
Total revenue | 2,947 | 2,915
Expenses |  |
Compensation and benefits | 1,751 | 1,725
Other general expenses | 727 | 780
Total operating expenses | 2,478 | 2,505
Operating income | 469 | 410
Interest income | 2 | 1
Interest expense | (58) | (52)
Intercompany interest income (expense) | 0 | 0
Other income | 1 | 9
Income before income taxes | 414 | 368
Income tax (benefit) expense | 78 | 96
Income (loss) before equity in earnings of subsidiaries | 336 | 272
Equity in earnings of subsidiaries, net of tax | 0 | 0
Net income | 336 | 272
Less: Net income attributable to noncontrolling interests | 11 | 11
Net income attributable to Aon shareholders | 325 | 261
Aon plc [Member] |  |
Revenue |  |
Commissions, fees and other | 1 | 1
Fiduciary investment income | 0 | 0
Total revenue | 1 | 1
Expenses |  |
Compensation and benefits | 12 | 11
Other general expenses | 7 | 7
Total operating expenses | 19 | 18
Operating income | (18) | (17)
Interest income | (2) | 0
Interest expense | (9) | (2)
Intercompany interest income (expense) | 111 | (7)
Other income | 0 | 0
Income before income taxes | 82 | (26)
Income tax (benefit) expense | 20 | (5)
Income (loss) before equity in earnings of subsidiaries | 62 | (21)
Equity in earnings of subsidiaries, net of tax | 263 | 282
Net income | 325 | 261
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 325 | 261
Aon Corporation [Member] |  |
Revenue |  |
Commissions, fees and other | 0 | 0
Fiduciary investment income | 0 | 0
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 8 | 15
Other general expenses | 17 | 6
Total operating expenses | 25 | 21
Operating income | (25) | (21)
Interest income | 0 | 1
Interest expense | (31) | (34)
Intercompany interest income (expense) | (74) | 43
Other income | 0 | (1)
Income before income taxes | (130) | (12)
Income tax (benefit) expense | (50) | (5)
Income (loss) before equity in earnings of subsidiaries | (80) | (7)
Equity in earnings of subsidiaries, net of tax | 280 | 254
Net income | 200 | 247
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 200 | 247
Other Non-Guarantor Subsidiaries [Member] |  |
Revenue |  |
Commissions, fees and other | 2,940 | 2,907
Fiduciary investment income | 6 | 7
Total revenue | 2,946 | 2,914
Expenses |  |
Compensation and benefits | 1,731 | 1,699
Other general expenses | 703 | 767
Total operating expenses | 2,434 | 2,466
Operating income | 512 | 448
Interest income | 4 | 0
Interest expense | (18) | (16)
Intercompany interest income (expense) | (37) | (36)
Other income | 1 | 10
Income before income taxes | 462 | 406
Income tax (benefit) expense | 108 | 106
Income (loss) before equity in earnings of subsidiaries | 354 | 300
Equity in earnings of subsidiaries, net of tax | 0 | 0
Net income | 354 | 300
Less: Net income attributable to noncontrolling interests | 11 | 11
Net income attributable to Aon shareholders | 343 | 289
Consolidating Adjustments [Member] |  |
Revenue |  |
Commissions, fees and other | 0 | 0
Fiduciary investment income | 0 | 0
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 0 | 0
Other general expenses | 0 | 0
Total operating expenses | 0 | 0
Operating income | 0 | 0
Interest income | 0 | 0
Interest expense | 0 | 0
Intercompany interest income (expense) | 0 | 0
Other income | 0 | 0
Income before income taxes | 0 | 0
Income tax (benefit) expense | 0 | 0
Income (loss) before equity in earnings of subsidiaries | 0 | 0
Equity in earnings of subsidiaries, net of tax | (543) | (536)
Net income | (543) | (536)
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | $ (543) | $ (536)

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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