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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenue |  |  |  |
Commissions, fees and other | $ 2,761 | $ 2,800 | $ 5,548 | $ 5,642
Fiduciary investment income | 5 | 5 | 10 | 10
Total revenue | 2,766 | 2,805 | 5,558 | 5,652
Expenses |  |  |  |
Compensation and benefits | 1,688 | 1,653 | 3,337 | 3,336
Other general expenses | 673 | 875 | 1,366 | 1,598
Total operating expenses | 2,361 | 2,528 | 4,703 | 4,934
Operating income | 405 | 277 | 855 | 718
Interest income | 3 | 4 | 5 | 7
Interest expense | (73) | (68) | (142) | (133)
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Intercompany other (expense) income | 0 | 0 | 0 | 0
Other income | 0 | 1 | 18 | 43
Income before income taxes | 335 | 214 | 736 | 635
Income tax (benefit) expense | 55 | 26 | 129 | 106
(Loss) income before equity in earnings of subsidiaries | 280 | 188 | 607 | 529
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 280 | 188 | 607 | 529
Less: Net income attributable to noncontrolling interests | 8 | 10 | 20 | 23
Net income attributable to Aon shareholders | 272 | 178 | 587 | 506
Aon plc [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 | 8 | 5 | 51 | 57
Other general expenses | (1) | (4) | 6 | 9
Total operating expenses | 7 | 1 | 57 | 66
Operating income | (7) | (1) | (57) | (66)
Interest income | 0 | (5) | 0 | (9)
Interest expense | (49) | (29) | (94) | (54)
Intercompany interest income (expense) | 3 | 119 | 7 | 239
Intercompany other (expense) income | (57) | (56) | (111) | (106)
Other income | 2 | (1) | 2 | 1
Income before income taxes | (108) | 27 | (253) | 5
Income tax (benefit) expense | (21) | 6 | (47) | 1
(Loss) income before equity in earnings of subsidiaries | (87) | 21 | (206) | 4
Equity in earnings of subsidiaries, net of tax | 363 | 157 | 797 | 502
Net income | 276 | 178 | 591 | 506
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 276 | 178 | 591 | 506
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 | 3 | 10 | 6 | 21
Other general expenses | 2 | 2 | 4 | 4
Total operating expenses | 5 | 12 | 10 | 25
Operating income | (5) | (12) | (10) | (25)
Interest income | 4 | 4 | 9 | 7
Interest expense | (26) | (33) | (54) | (68)
Intercompany interest income (expense) | (137) | (116) | (270) | (221)
Intercompany other (expense) income | (16) | (15) | (15) | (23)
Other income | (4) | 0 | (9) | 8
Income before income taxes | (184) | (172) | (349) | (322)
Income tax (benefit) expense | (64) | (66) | (126) | (117)
(Loss) income before equity in earnings of subsidiaries | (120) | (106) | (223) | (205)
Equity in earnings of subsidiaries, net of tax | 236 | 170 | 603 | 571
Net income | 116 | 64 | 380 | 366
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 116 | 64 | 380 | 366
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
Revenue |  |  |  |
Commissions, fees and other | 2,761 | 2,800 | 5,548 | 5,642
Fiduciary investment income | 5 | 5 | 10 | 10
Total revenue | 2,766 | 2,805 | 5,558 | 5,652
Expenses |  |  |  |
Compensation and benefits | 1,677 | 1,638 | 3,280 | 3,258
Other general expenses | 672 | 877 | 1,356 | 1,585
Total operating expenses | 2,349 | 2,515 | 4,636 | 4,843
Operating income | 417 | 290 | 922 | 809
Interest income | 5 | 5 | 9 | 9
Interest expense | (4) | (6) | (7) | (11)
Intercompany interest income (expense) | 134 | (3) | 263 | (18)
Intercompany other (expense) income | 73 | 71 | 126 | 129
Other income | 6 | 2 | 29 | 34
Income before income taxes | 631 | 359 | 1,342 | 952
Income tax (benefit) expense | 140 | 86 | 302 | 222
(Loss) income before equity in earnings of subsidiaries | 491 | 273 | 1,040 | 730
Equity in earnings of subsidiaries, net of tax | 116 | 64 | 380 | 366
Net income | 607 | 337 | 1,420 | 1,096
Less: Net income attributable to noncontrolling interests | 8 | 10 | 20 | 23
Net income attributable to Aon shareholders | 599 | 327 | 1,400 | 1,073
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 | (6) | 0 | (13) | 0
Interest expense | 6 | 0 | 13 | 0
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Intercompany other (expense) income | 0 | 0 | 0 | 0
Other income | (4) | 0 | (4) | 0
Income before income taxes | (4) | 0 | (4) | 0
Income tax (benefit) expense | 0 | 0 | 0 | 0
(Loss) income before equity in earnings of subsidiaries | (4) | 0 | (4) | 0
Equity in earnings of subsidiaries, net of tax | (715) | (391) | (1,780) | (1,439)
Net income | (719) | (391) | (1,784) | (1,439)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | $ (719) | $ (391) | $ (1,784) | $ (1,439)

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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