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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 2,909 | $ 2,340 | $ 2,368 | $ 2,381 | $ 2,650 | $ 2,201 | $ 2,282 | $ 2,276 | $ 9,998 | $ 9,409 | $ 9,480
Expenses |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 6,089 | 5,687 | 5,605
Information technology |  |  |  |  |  |  |  |  | 419 | 386 | 389
Premises |  |  |  |  |  |  |  |  | 348 | 343 | 362
Depreciation of fixed assets |  |  |  |  |  |  |  |  | 187 | 162 | 164
Amortization and impairment of intangible assets |  |  |  |  |  |  |  |  | 704 | 157 | 173
Other general expenses |  |  |  |  |  |  |  |  | 1,272 | 1,036 | 1,200
Total operating expenses |  |  |  |  |  |  |  |  | 9,019 | 7,771 | 7,893
Operating income | 489 | 265 | (118) | 343 | 463 | 368 | 387 | 420 | 979 | 1,638 | 1,587
Interest income |  |  |  |  |  |  |  |  | 27 | 9 | 14
Interest expense |  |  |  |  |  |  |  |  | (282) | (282) | (273)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (expense) |  |  |  |  |  |  |  |  | (39) | 36 | 100
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 685 | 1,401 | 1,428
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 250 | 148 | 175
Net income from continuing operations | 17 | 196 | (43) | 265 | 384 | 284 | 273 | 312 | 435 | 1,253 | 1,253
Income from discontinued operations, net of tax | (29) | (4) | 821 | 40 | 75 | 42 | 35 | 25 | 828 | 177 | 169
Income (loss) before equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 1,263 | 1,430 | 1,422
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | (12) | 192 | 778 | 305 | 459 | 326 | 308 | 337 | 1,263 | 1,430 | 1,422
Less: Net income attributable to noncontrolling interests | 7 | 7 | 9 | 14 | 7 | 7 | 8 | 12 | 37 | 34 | 37
Net income attributable to Aon shareholders | $ (19) | $ 185 | $ 769 | $ 291 | $ 452 | $ 319 | $ 300 | $ 325 | 1,226 | 1,396 | 1,385
Aon plc |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 150 | 130 | 136
Information technology |  |  |  |  |  |  |  |  | 0 | 0 | 0
Premises |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of fixed assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amortization and impairment of intangible assets |  |  |  |  |  |  |  |  | 0 | 0 |
Other general expenses |  |  |  |  |  |  |  |  | 12 | 0 | 8
Total operating expenses |  |  |  |  |  |  |  |  | 162 | 130 | 144
Operating income |  |  |  |  |  |  |  |  | (162) | (130) | (144)
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (202) | (196) | (140)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  | 14 | 14 | 429
Intercompany other income (expense) |  |  |  |  |  |  |  |  | 247 | 274 | 302
Other income (expense) |  |  |  |  |  |  |  |  | (27) | 15 | (1)
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | (130) | (23) | 446
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (43) | (55) | 45
Net income from continuing operations |  |  |  |  |  |  |  |  | (87) | 32 | 401
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before equity earnings of subsidiaries |  |  |  |  |  |  |  |  | (87) | 32 | 401
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 1,295 | 1,382 | 984
Net income |  |  |  |  |  |  |  |  | 1,208 | 1,414 | 1,385
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  | 1,208 | 1,414 | 1,385
Aon Corporation |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 35 | 171 | 32
Information technology |  |  |  |  |  |  |  |  | 0 | 0 | 0
Premises |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of fixed assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amortization and impairment of intangible assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other general expenses |  |  |  |  |  |  |  |  | (6) | 2 | 7
Total operating expenses |  |  |  |  |  |  |  |  | 29 | 173 | 39
Operating income |  |  |  |  |  |  |  |  | (29) | (173) | (39)
Interest income |  |  |  |  |  |  |  |  | 52 | 16 | 14
Interest expense |  |  |  |  |  |  |  |  | (94) | (101) | (130)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  | (543) | (541) | (479)
Intercompany other income (expense) |  |  |  |  |  |  |  |  | (411) | (361) | (422)
Other income (expense) |  |  |  |  |  |  |  |  | 21 | (5) | 0
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | (1,004) | (1,165) | (1,056)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (110) | (325) | (262)
Net income from continuing operations |  |  |  |  |  |  |  |  | (894) | (840) | (794)
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before equity earnings of subsidiaries |  |  |  |  |  |  |  |  | (894) | (840) | (794)
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 1,054 | 1,219 | 1,289
Net income |  |  |  |  |  |  |  |  | 160 | 379 | 495
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  | 160 | 379 | 495
Other Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 9,998 | 9,409 | 9,480
Expenses |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 5,904 | 5,386 | 5,437
Information technology |  |  |  |  |  |  |  |  | 419 | 386 | 389
Premises |  |  |  |  |  |  |  |  | 348 | 343 | 362
Depreciation of fixed assets |  |  |  |  |  |  |  |  | 187 | 162 | 164
Amortization and impairment of intangible assets |  |  |  |  |  |  |  |  | 704 | 157 | 173
Other general expenses |  |  |  |  |  |  |  |  | 1,266 | 1,034 | 1,185
Total operating expenses |  |  |  |  |  |  |  |  | 8,828 | 7,468 | 7,710
Operating income |  |  |  |  |  |  |  |  | 1,170 | 1,941 | 1,770
Interest income |  |  |  |  |  |  |  |  | 4 | 22 | 19
Interest expense |  |  |  |  |  |  |  |  | (15) | (14) | (22)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  | 529 | 527 | 50
Intercompany other income (expense) |  |  |  |  |  |  |  |  | 164 | 87 | 120
Other income (expense) |  |  |  |  |  |  |  |  | (51) | 44 | 101
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 1,801 | 2,607 | 2,038
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 403 | 528 | 392
Net income from continuing operations |  |  |  |  |  |  |  |  | 1,398 | 2,079 | 1,646
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 828 | 177 | 169
Income (loss) before equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 2,226 | 2,256 | 1,815
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 160 | 379 | 495
Net income |  |  |  |  |  |  |  |  | 2,386 | 2,635 | 2,310
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 37 | 34 | 37
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  | 2,349 | 2,601 | 2,273
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 0 | 0 | 0
Information technology |  |  |  |  |  |  |  |  | 0 | 0 | 0
Premises |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of fixed assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amortization and impairment of intangible assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other general expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | (29) | (29) | (19)
Interest expense |  |  |  |  |  |  |  |  | 29 | 29 | 19
Intercompany interest income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (expense) |  |  |  |  |  |  |  |  | 18 | (18) | 0
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 18 | (18) | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income from continuing operations |  |  |  |  |  |  |  |  | 18 | (18) | 0
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 18 | (18) | 0
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | (2,509) | (2,980) | (2,768)
Net income |  |  |  |  |  |  |  |  | (2,491) | (2,998) | (2,768)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  | $ (2,491) | $ (2,998) | $ (2,768)

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