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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Consolidated Revenue by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):
|  | Three months ended March 31, 2018
United States |  | $ | 1,116 |
Americas other than United States |  | 237 |
United Kingdom |  | 484 |
Europe, Middle East, & Africa other than United Kingdom |  | 979 |
Asia Pacific |  | 274 |
Total revenue |  | $ | 3,090 |
The following table summarizes revenue from contracts with customers by principal service line (in millions):
|  | Three months ended March 31, 2018
Commercial Risk Solutions |  | $ | 1,184 |
Reinsurance Solutions |  | 742 |
Retirement Solutions |  | 424 |
Health Solutions |  | 451 |
Data & Analytic Services |  | 294 |
Elimination |  | (5 | )
Total revenue |  | $ | 3,090 |
Capitalized Contract Cost | The changes in the net carrying amount of capitalized cost to fulfill contracts with customers are as follows (in millions):
|  | Three months ended March 31, 2018
Balance at beginning of period |  | $ | 298 |
Additions |  | 370 |
Amortization |  | (432 | )
Impairment |  | — |
Foreign currency translation and other |  | 4 |
Balance at end of period |  | $ | 240 |
The changes in the net carrying amount of capitalized cost to obtain contracts with customers are as follows (in millions):
|  | Three months ended March 31, 2018
Balance at beginning of period |  | $ | 145 |
Additions |  | 8 |
Amortization |  | (10 | )
Impairment |  | — |
Foreign currency translation and other |  | 1 |
Balance at end of period |  | $ | 144 |

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- Definition Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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