XML 130 R128.htm IDEA: XBRL DOCUMENT
v3.20.1

Segment Information - Schedule of consolidated non-current assets by geographic area (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | $ 1,550 |
Fixed assets, net | 621 | $ 588
U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | 686 |
Fixed assets, net |  | 288
Americas other than U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | 145 |
Fixed assets, net |  | 44
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | 225 |
Fixed assets, net |  | 58
Europe, Middle East, & Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | 319 |
Fixed assets, net |  | 101
Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets, including operating lease ROU assets | $ 175 |
Fixed assets, net |  | $ 97

X
- Definition Property, Plant And Equipment And Operating Lease Right-Of-Use Asset, After Accumulated Depreciation and Amortization + References No definition available. + Details
Name: | aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=aon_AmericasOtherthanUnitedStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_EMEAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |