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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2019
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
|  | 2019 |  | 2018 |  | 2017
Commercial Risk Solutions |  | $ | 4,673 |  |  | $ | 4,652 |  |  | $ | 4,169 |
Reinsurance Solutions |  | 1,686 |  |  | 1,563 |  |  | 1,429 |
Retirement Solutions |  | 1,817 |  |  | 1,865 |  |  | 1,755 |
Health Solutions |  | 1,667 |  |  | 1,596 |  |  | 1,515 |
Data & Analytic Services |  | 1,184 |  |  | 1,105 |  |  | 1,140 |
Elimination |  | (14 | ) |  | (11 | ) |  | (10 | )
Total revenue |  | $ | 11,013 |  |  | $ | 10,770 |  |  | $ | 9,998 |
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
|  | 2019 |  | 2018 |  | 2017
United States |  | $ | 5,016 |  |  | $ | 4,677 |  |  | $ | 4,425 |
Americas other than United States |  | 919 |  |  | 940 |  |  | 976 |
United Kingdom |  | 1,502 |  |  | 1,555 |  |  | 1,436 |
Europe, Middle East, & Africa other than United Kingdom |  | 2,338 |  |  | 2,413 |  |  | 2,025 |
Asia Pacific |  | 1,238 |  |  | 1,185 |  |  | 1,136 |
Total revenue |  | $ | 11,013 |  |  | $ | 10,770 |  |  | $ | 9,998 |
Capitalized Contract Cost | Changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
|  | 2019 |  | 2018
Balance at beginning of period |  | $ | 156 |  |  | $ | 145 |
Additions |  | 58 |  |  | 53 |
Amortization |  | (44 | ) |  | (41 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | 1 |  |  | (1 | )
Balance at end of period |  | $ | 171 |  |  | $ | 156 |
Changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
|  | 2019 |  | 2018
Balance at beginning of period |  | $ | 329 |  |  | $ | 298 |
Additions |  | 1,453 |  |  | 1,504 |
Amortization |  | (1,447 | ) |  | (1,465 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | — |  |  | (8 | )
Balance at end of period |  | $ | 335 |  |  | $ | 329 |

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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=118956577&loc=SL49130545-203045 + Details
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