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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets | $ 322 |  |  |  | $ 300 |  |  |  |  |  | $ 322 | $ 300 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other | 3,256 | $ 2,754 | $ 2,795 | $ 2,800 | 3,222 | $ 2,746 | $ 2,831 | $ 2,862 |  |  | 11,605 | 11,661 | $ 12,019
Fiduciary investment income | 6 | 6 | 5 | 5 | 5 | 6 | 5 | 5 |  |  | 22 | 21 | 26
Total revenue | 3,262 | 2,760 | 2,800 | 2,805 | 3,227 | 2,752 | 2,836 | 2,867 |  |  | 11,627 | 11,682 | 12,045
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  |  |  | 6,914 | 6,837 | 7,014
Other general expenses |  |  |  |  |  |  |  |  |  |  | 2,807 | 2,997 | 3,065
Total operating expenses |  |  |  |  |  |  |  |  |  |  | 9,721 | 9,834 | 10,079
Operating income | 568 | 436 | 439 | 463 | 656 | 423 | 308 | 461 |  |  | 1,906 | 1,848 | 1,966
Interest income |  |  |  |  |  |  |  |  |  |  | 9 | 14 | 10
Interest expense |  |  |  |  |  |  |  |  |  |  | (282) | (273) | (255)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany other income (expense) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  |  |  | 36 | 100 | 44
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 1,669 | 1,689 | 1,765
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 239 | 267 | 334
Income (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,430 | 1,422 | 1,431
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | 459 | 326 | 308 | 337 | 540 | 311 | 214 | 357 | $ 645 | $ 971 | 1,430 | 1,422 | 1,431
Less: Net income attributable to noncontrolling interests | 7 | 7 | 8 | 12 | 6 | 8 | 10 | 13 |  |  | 34 | 37 | 34
Net income attributable to Aon shareholders | 452 | $ 319 | $ 300 | $ 325 | 534 | $ 303 | $ 204 | $ 344 |  |  | 1,396 | 1,385 | 1,397
Aon plc |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets | 134 |  |  |  | 154 |  |  |  |  |  | 134 | 154 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Fiduciary investment income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  |  |  | 130 | 136 | 140
Other general expenses |  |  |  |  |  |  |  |  |  |  | 0 | 8 | 3
Total operating expenses |  |  |  |  |  |  |  |  |  |  | 130 | 144 | 143
Operating income |  |  |  |  |  |  |  |  |  |  | (130) | (144) | (143)
Interest income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  | (196) | (140) | (84)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  |  |  | 14 | 429 | 449
Intercompany other income (expense) |  |  |  |  |  |  |  |  |  |  | 274 | 302 | 342
Other income |  |  |  |  |  |  |  |  |  |  | 15 | (1) | 2
Income before income taxes |  |  |  |  |  |  |  |  |  |  | (23) | 446 | 566
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (55) | 45 | 74
Income (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 32 | 401 | 492
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 1,382 | 984 | 905
Net income |  |  |  |  |  |  |  |  |  |  | 1,414 | 1,385 | 1,397
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 1,414 | 1,385 | 1,397
Aon Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets | 726 |  |  |  | 756 |  |  |  |  |  | 726 | 756 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Fiduciary investment income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  |  |  | 171 | 32 | 16
Other general expenses |  |  |  |  |  |  |  |  |  |  | 2 | 7 | 5
Total operating expenses |  |  |  |  |  |  |  |  |  |  | 173 | 39 | 21
Operating income |  |  |  |  |  |  |  |  |  |  | (173) | (39) | (21)
Interest income |  |  |  |  |  |  |  |  |  |  | 16 | 14 | 2
Interest expense |  |  |  |  |  |  |  |  |  |  | (101) | (130) | (139)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  |  |  | (541) | (479) | (298)
Intercompany other income (expense) |  |  |  |  |  |  |  |  |  |  | (361) | (422) | (390)
Other income |  |  |  |  |  |  |  |  |  |  | (5) | 0 | 5
Income before income taxes |  |  |  |  |  |  |  |  |  |  | (1,165) | (1,056) | (841)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (325) | (262) | (192)
Income (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | (840) | (794) | (649)
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 1,219 | 1,290 | 1,195
Net income |  |  |  |  |  |  |  |  |  |  | 379 | 496 | 546
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 379 | 496 | 546
Other Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets | 168 |  |  |  | 207 |  |  |  |  |  | 168 | 207 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  |  |  | 11,605 | 11,661 | 12,019
Fiduciary investment income |  |  |  |  |  |  |  |  |  |  | 22 | 21 | 26
Total revenue |  |  |  |  |  |  |  |  |  |  | 11,627 | 11,682 | 12,045
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  |  |  | 6,613 | 6,669 | 6,858
Other general expenses |  |  |  |  |  |  |  |  |  |  | 2,805 | 2,982 | 3,057
Total operating expenses |  |  |  |  |  |  |  |  |  |  | 9,418 | 9,651 | 9,915
Operating income |  |  |  |  |  |  |  |  |  |  | 2,209 | 2,031 | 2,130
Interest income |  |  |  |  |  |  |  |  |  |  | 22 | 19 | 17
Interest expense |  |  |  |  |  |  |  |  |  |  | (14) | (22) | (41)
Intercompany interest income (expense) |  |  |  |  |  |  |  |  |  |  | 527 | 50 | (151)
Intercompany other income (expense) |  |  |  |  |  |  |  |  |  |  | 87 | 120 | 48
Other income |  |  |  |  |  |  |  |  |  |  | 44 | 101 | 37
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 2,875 | 2,299 | 2,040
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 619 | 484 | 452
Income (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 2,256 | 1,815 | 1,588
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 379 | 496 | 546
Net income |  |  |  |  |  |  |  |  |  |  | 2,635 | 2,311 | 2,134
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 34 | 37 | 34
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 2,601 | 2,274 | 2,100
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets | $ (706) |  |  |  | $ (817) |  |  |  |  |  | (706) | (817) |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Fiduciary investment income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other general expenses |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  |  |  | (29) | (19) | (9)
Interest expense |  |  |  |  |  |  |  |  |  |  | 29 | 19 | 9
Intercompany interest income (expense) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany other income (expense) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  |  |  | (18) | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | (18) | 0 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | (18) | 0 | 0
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | (2,980) | (2,770) | (2,646)
Net income |  |  |  |  |  |  |  |  |  |  | (2,998) | (2,770) | (2,646)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | $ (2,998) | $ (2,770) | $ (2,646)

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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