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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
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 |
Capitalized Contract Cost | 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 Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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