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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue |  |  |  |
Total revenue | $ 2,349 | $ 2,340 | $ 8,000 | $ 7,089
Expenses |  |  |  |
Compensation and benefits | 1,392 | 1,428 | 4,502 | 4,363
Information technology | 125 | 109 | 363 | 295
Premises | 94 | 89 | 283 | 259
Depreciation of fixed assets | 40 | 40 | 126 | 148
Amortization and impairment of intangible assets | 100 | 101 | 492 | 604
Other general expenses | 336 | 317 | 1,189 | 956
Total operating expenses | 2,087 | 2,084 | 6,955 | 6,625
Operating income | 262 | 256 | 1,045 | 464
Interest income | 0 | 10 | 5 | 20
Interest expense | (69) | (70) | (208) | (211)
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Intercompany other income (expense) | 0 | 0 | 0 | 0
Other income (expense) | 1 | 4 | (17) | 6
Income from continuing operations before income taxes | 194 | 200 | 825 | 279
Income tax expense (benefit) | 39 | 4 | 9 | (139)
Net income from continuing operations | 155 | 196 | 816 | 418
Net income (loss) from discontinued operations | (2) | (4) | 5 | 857
Net income (loss) before equity in earnings of subsidiaries | 153 | 192 | 821 | 1,275
Equity in earnings of subsidiaries, net of tax | 0 | 0 | 0 | 0
Net income | 153 | 192 | 821 | 1,275
Less: Net income attributable to noncontrolling interests | 6 | 7 | 32 | 30
Net income attributable to Aon shareholders | 147 | 185 | 789 | 1,245
Aon plc |  |  |  |
Revenue |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Expenses |  |  |  |
Compensation and benefits | 13 | 25 | 47 | 85
Information technology | 0 | 0 | 0 | 0
Premises | 0 | 0 | 0 | 0
Depreciation of fixed assets | 0 | 0 | 0 | 0
Amortization and impairment of intangible assets | 0 | 0 | 0 | 0
Other general expenses | 0 | 1 | 3 | 10
Total operating expenses | 13 | 26 | 50 | 95
Operating income | (13) | (26) | (50) | (95)
Interest income | 0 | 0 | 0 | 0
Interest expense | (52) | (53) | (149) | (144)
Intercompany interest income (expense) | 4 | 3 | 11 | 10
Intercompany other income (expense) | 245 | 291 | 113 | 189
Other income (expense) | (5) | (2) | 4 | (25)
Income from continuing operations before income taxes | 179 | 213 | (71) | (65)
Income tax expense (benefit) | (8) | (8) | (27) | (30)
Net income from continuing operations | 187 | 221 | (44) | (35)
Net income (loss) from discontinued operations | 0 | 0 | 0 | 0
Net income (loss) before equity in earnings of subsidiaries | 187 | 221 | (44) | (35)
Equity in earnings of subsidiaries, net of tax | (42) | (36) | 846 | 1,262
Net income | 145 | 185 | 802 | 1,227
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 145 | 185 | 802 | 1,227
Aon Corporation |  |  |  |
Revenue |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Expenses |  |  |  |
Compensation and benefits | 3 | 18 | 5 | 24
Information technology | 0 | 0 | 0 | 0
Premises | 0 | 0 | 0 | 0
Depreciation of fixed assets | 0 | 0 | 0 | 0
Amortization and impairment of intangible assets | 0 | 0 | 0 | 0
Other general expenses | (7) | 1 | 71 | (3)
Total operating expenses | (4) | 19 | 76 | 21
Operating income | 4 | (19) | (76) | (21)
Interest income | 15 | 18 | 44 | 35
Interest expense | (26) | (24) | (75) | (71)
Intercompany interest income (expense) | (128) | (135) | (385) | (407)
Intercompany other income (expense) | (251) | (271) | (259) | (280)
Other income (expense) | (3) | 12 | (29) | 15
Income from continuing operations before income taxes | (389) | (419) | (780) | (729)
Income tax expense (benefit) | (67) | (81) | (144) | (198)
Net income from continuing operations | (322) | (338) | (636) | (531)
Net income (loss) from discontinued operations | 0 | 0 | 0 | 0
Net income (loss) before equity in earnings of subsidiaries | (322) | (338) | (636) | (531)
Equity in earnings of subsidiaries, net of tax | (42) | 122 | 868 | 1,028
Net income | (364) | (216) | 232 | 497
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | (364) | (216) | 232 | 497
Other Non-Guarantor Subsidiaries |  |  |  |
Revenue |  |  |  |
Total revenue | 2,349 | 2,340 | 8,000 | 7,089
Expenses |  |  |  |
Compensation and benefits | 1,376 | 1,385 | 4,450 | 4,254
Information technology | 125 | 109 | 363 | 295
Premises | 94 | 89 | 283 | 259
Depreciation of fixed assets | 40 | 40 | 126 | 148
Amortization and impairment of intangible assets | 100 | 101 | 492 | 604
Other general expenses | 343 | 315 | 1,115 | 949
Total operating expenses | 2,078 | 2,039 | 6,829 | 6,509
Operating income | 271 | 301 | 1,171 | 580
Interest income | 0 | 0 | 0 | 0
Interest expense | (6) | (1) | (23) | (11)
Intercompany interest income (expense) | 124 | 132 | 374 | 397
Intercompany other income (expense) | 6 | (20) | 146 | 91
Other income (expense) | 7 | (6) | 21 | (2)
Income from continuing operations before income taxes | 402 | 406 | 1,689 | 1,055
Income tax expense (benefit) | 114 | 93 | 180 | 89
Net income from continuing operations | 288 | 313 | 1,509 | 966
Net income (loss) from discontinued operations | (2) | (4) | 5 | 857
Net income (loss) before equity in earnings of subsidiaries | 286 | 309 | 1,514 | 1,823
Equity in earnings of subsidiaries, net of tax | (364) | (216) | 232 | 497
Net income | (78) | 93 | 1,746 | 2,320
Less: Net income attributable to noncontrolling interests | 6 | 7 | 32 | 30
Net income attributable to Aon shareholders | (84) | 86 | 1,714 | 2,290
Consolidation Adjustments |  |  |  |
Revenue |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Expenses |  |  |  |
Compensation and benefits | 0 | 0 | 0 | 0
Information technology | 0 | 0 | 0 | 0
Premises | 0 | 0 | 0 | 0
Depreciation of fixed assets | 0 | 0 | 0 | 0
Amortization and impairment of intangible assets | 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 | (15) | (8) | (39) | (15)
Interest expense | 15 | 8 | 39 | 15
Intercompany interest income (expense) | 0 | 0 | 0 | 0
Intercompany other income (expense) | 0 | 0 | 0 | 0
Other income (expense) | 2 | 0 | (13) | 18
Income from continuing operations before income taxes | 2 | 0 | (13) | 18
Income tax expense (benefit) | 0 | 0 | 0 | 0
Net income from continuing operations | 2 | 0 | (13) | 18
Net income (loss) from discontinued operations | 0 | 0 | 0 | 0
Net income (loss) before equity in earnings of subsidiaries | 2 | 0 | (13) | 18
Equity in earnings of subsidiaries, net of tax | 448 | 130 | (1,946) | (2,787)
Net income | 450 | 130 | (1,959) | (2,769)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | $ 450 | $ 130 | $ (1,959) | $ (2,769)

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