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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,696 | $ 2,702 | $ 9,349 | $ 9,113
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,338 | 1,329 | 4,094 | 3,900
Americas other than United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 250 | 230 | 814 | 748
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 331 | 340 | 1,348 | 1,368
Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 22 | 22 | 76 | 94
Europe, Middle East, & Africa other than United Kingdom and Ireland |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 403 | 438 | 1,930 | 2,028
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 352 | 343 | 1,087 | 975
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | (2) | (4) | (13) | (15)
Commercial Risk Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 1,482 | 1,505 | 4,893 | 4,788
Reinsurance Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 396 | 353 | 1,909 | 1,775
Health Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 494 | 497 | 1,546 | 1,503
Wealth Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 326 | $ 351 | $ 1,014 | $ 1,062

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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