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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Revenue |  |
Commissions, fees and other | $ 2,787 | $ 2,842
Fiduciary investment income | 5 | 5
Total revenue | 2,792 | 2,847
Expenses |  |
Compensation and benefits | 1,649 | 1,683
Other general expenses | 693 | 723
Total operating expenses | 2,342 | 2,406
Operating income | 450 | 441
Interest income | 2 | 3
Interest expense | (69) | (65)
Intercompany interest income (expense) | 0 | 0
Intercompany other (expense) income | 0 | 0
Other income | 18 | 42
Income before income taxes | 401 | 421
Income tax (benefit) expense | 74 | 80
(Loss) income before equity in earnings of subsidiaries | 327 | 341
Equity in earnings of subsidiaries, net of tax | 0 | 0
Net income | 327 | 341
Less: Net income attributable to noncontrolling interests | 12 | 13
Net income attributable to Aon shareholders | 315 | 328
Aon plc [Member] |  |
Revenue |  |
Commissions, fees and other | 0 | 0
Fiduciary investment income | 0 | 0
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 43 | 52
Other general expenses | 7 | 13
Total operating expenses | 50 | 65
Operating income | (50) | (65)
Interest income | (7) | (5)
Interest expense | (38) | (25)
Intercompany interest income (expense) | 4 | 119
Intercompany other (expense) income | (54) | (50)
Other income | 0 | 2
Income before income taxes | (145) | (24)
Income tax (benefit) expense | (26) | (5)
(Loss) income before equity in earnings of subsidiaries | (119) | (19)
Equity in earnings of subsidiaries, net of tax | 434 | 347
Net income | 315 | 328
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 315 | 328
Aon Corporation [Member] |  |
Revenue |  |
Commissions, fees and other | 0 | 0
Fiduciary investment income | 0 | 0
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 3 | 11
Other general expenses | 2 | 2
Total operating expenses | 5 | 13
Operating income | (5) | (13)
Interest income | 5 | 3
Interest expense | (28) | (34)
Intercompany interest income (expense) | (133) | (105)
Intercompany other (expense) income | 1 | (8)
Other income | (5) | 8
Income before income taxes | (165) | (149)
Income tax (benefit) expense | (62) | (50)
(Loss) income before equity in earnings of subsidiaries | (103) | (99)
Equity in earnings of subsidiaries, net of tax | 367 | 403
Net income | 264 | 304
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 264 | 304
Other Non-Guarantor Subsidiaries [Member] |  |
Revenue |  |
Commissions, fees and other | 2,787 | 2,842
Fiduciary investment income | 5 | 5
Total revenue | 2,792 | 2,847
Expenses |  |
Compensation and benefits | 1,603 | 1,620
Other general expenses | 684 | 708
Total operating expenses | 2,287 | 2,328
Operating income | 505 | 519
Interest income | 4 | 5
Interest expense | (3) | (6)
Intercompany interest income (expense) | 129 | (14)
Intercompany other (expense) income | 53 | 58
Other income | 23 | 32
Income before income taxes | 711 | 594
Income tax (benefit) expense | 162 | 135
(Loss) income before equity in earnings of subsidiaries | 549 | 459
Equity in earnings of subsidiaries, net of tax | 264 | 304
Net income | 813 | 763
Less: Net income attributable to noncontrolling interests | 12 | 13
Net income attributable to Aon shareholders | 801 | 750
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
Intercompany other (expense) income | 0 | 0
Other income | 0 | 0
Income before income taxes | 0 | 0
Income tax (benefit) expense | 0 | 0
(Loss) income before equity in earnings of subsidiaries | 0 | 0
Equity in earnings of subsidiaries, net of tax | (1,065) | (1,054)
Net income | (1,065) | (1,054)
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | $ (1,065) | $ (1,054)

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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