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Acquisitions and Dispositions (Narrative) (Details) £ / shares in Units, colleague in Thousands, $ in Millions, £ in Billions |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2019 USD ($) | Apr. 01, 2019 USD ($) | Apr. 01, 2019 GBP (£) colleague £ / shares | Sep. 20, 2018 GBP (£) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) acquisition | Sep. 30, 2018 USD ($) | Dec. 31, 2018 acquisition | Jan. 01, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  |  |  | $ 2,758 | $ 35 |  |
Total consideration |  |  |  |  |  |  |  | 5,925 | 661 |  |
Cash |  |  |  |  |  |  |  | 5,859 | 553 |  |
Estimated fair value of deferred/contingent consideration |  |  |  |  |  |  |  | 66 | 108 |  |
Deferred purchase consideration from prior years' acquisitions |  |  |  |  |  |  |  | 37 | 59 |  |
Contingent consideration from prior year's acquisitions |  |  |  |  |  |  |  | 23 | 47 |  |
Amortization of intangible assets |  |  |  |  |  |  |  | 235 | 135 |  |
Payments to acquire outstanding minority interests of subsidiaries |  |  |  |  |  |  |  | 91 | 0 |  |
Increase (decrease) in costs |  |  |  |  | $ (4) |  |  | (173) | 662 |  |
Jardine Lloyd Thompson Group plc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, share price (in gbp per share) | £ / shares |  |  | £ 19.15 |  |  |  |  |  |  |  |
Equity interests issued and issuable |  | $ 5,600 | £ 4.3 |  |  |  |  |  |  |  |
Assumption of debt |  | $ 1,000 |  |  |  |  |  |  |  |  |
Entity number of employees | colleague |  |  | 10 |  |  |  |  |  |  |  |
Total consideration |  |  |  | £ 5.2 |  |  |  | 5,568 |  |  |
Cash |  |  |  |  |  |  |  | 5,568 |  |  |
Estimated fair value of deferred/contingent consideration |  |  |  |  |  |  |  | 0 |  |  |
Adjustments to intangible assets |  |  |  |  | (50) |  |  |  |  |  |
Goodwill, purchase accounting adjustments |  |  |  |  | 65 |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 4 |  |  | 99 |  |  |
Prior Fiscal Periods Acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred purchase consideration from prior years' acquisitions |  |  |  |  |  |  |  | 37 | 59 |  |
Contingent consideration from prior year's acquisitions |  |  |  |  |  |  |  | 58 | 76 |  |
Payments to acquire outstanding minority interests of subsidiaries |  |  |  |  |  |  | $ 75 |  |  |  |
Current Fiscal Period Acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | 5,925 |  |  |
Cash |  |  |  |  |  |  |  | 5,859 |  |  |
Estimated fair value of deferred/contingent consideration |  |  |  |  |  |  |  | 66 |  |  |
Revenue related to acquisitions |  |  |  |  | 352 | $ 36 |  | 848 | 50 |  |
Operating (loss) income related to acquisitions |  |  |  |  | (69) | $ (5) |  | $ (51) | $ (7) |  |
Risk and Insurance Services Segment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions made (in acquisitions) | acquisition |  |  |  |  |  |  |  | 4 |  | 12 |
Consulting Segment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions made (in acquisitions) | acquisition |  |  |  |  |  |  |  |  |  | 8 |
Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue target period (in years) |  |  |  |  |  |  |  | 2 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue target period (in years) |  |  |  |  |  |  |  | 4 years |  |  |
Marsh India |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in equity investment |  |  |  |  |  |  |  |  |  | 26.00% | 49.00%
Specialty Business and Large Market Health and Defined Benefit Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  | 60 |  |  |  |  |  |
JLT’s Global Aerospace Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, consideration | $ 165 |  |  |  |  |  |  |  |  |  |
Contingent consideration receivable | $ 65 |  |  |  |  |  |  |  |  |  |
Adjustment | Jardine Lloyd Thompson Group plc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ (4) |  |  |  |  |  |

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