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Revenue from Contracts with Customers | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Revenue from Contracts with Customers | Revenue from Contracts with Customers Disaggregation of Revenue The following table summarizes revenue from contracts with customers by principal service line (in millions):
|  | Years ended December 31
|  | 2020 |  | 2019 |  | 2018
Commercial Risk Solutions |  | $ | 4,690 |  |  | $ | 4,673 |  |  | $ | 4,652 |
Reinsurance Solutions |  | 1,814 |  |  | 1,686 |  |  | 1,563 |
Retirement Solutions |  | 1,753 |  |  | 1,817 |  |  | 1,865 |
Health Solutions |  | 1,655 |  |  | 1,667 |  |  | 1,596 |
Data & Analytic Services |  | 1,171 |  |  | 1,184 |  |  | 1,105 |
Elimination |  | (17) |  |  | (14) |  |  | (11) |
Total revenue |  | $ | 11,066 |  |  | $ | 11,013 |  |  | $ | 10,770 |
Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):
|  | Years ended December 31
|  | 2020 |  | 2019 |  | 2018
U.S. |  | $ | 5,032 |  |  | $ | 5,016 |  |  | $ | 4,677 |
Americas other than U.S. |  | 911 |  |  | 919 |  |  | 940 |
U.K. |  | 1,579 |  |  | 1,502 |  |  | 1,555 |
Ireland |  | 84 |  |  | 75 |  |  | 80 |
Europe, Middle East, & Africa other than U.K. and Ireland |  | 2,236 |  |  | 2,263 |  |  | 2,333 |
Asia Pacific |  | 1,224 |  |  | 1,238 |  |  | 1,185 |
Total revenue |  | $ | 11,066 |  |  | $ | 11,013 |  |  | $ | 10,770 |
Contract Costs Changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
|  | 2020 |  | 2019
Balance at beginning of period |  | $ | 335 |  |  | $ | 329 |
Additions |  | 1,360 |  |  | 1,453 |
Amortization |  | (1,360) |  |  | (1,447) |
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | 4 |  |  | — |
Balance at end of period |  | $ | 339 |  |  | $ | 335 |
Changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
|  | 2020 |  | 2019
Balance at beginning of period |  | $ | 171 |  |  | $ | 156 |
Additions |  | 61 |  |  | 58 |
Amortization |  | (47) |  |  | (44) |
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | (1) |  |  | 1 |
Balance at end of period |  | $ | 184 |  |  | $ | 171 |

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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