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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | 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):
|  | Three Months Ended March 31
|  | 2019 |  | 2018
United States |  | $ | 1,161 |  |  | $ | 1,116 |
Americas other than United States |  | 226 |  |  | 237 |
United Kingdom |  | 452 |  |  | 484 |
Europe, Middle East, & Africa other than United Kingdom |  | 1,009 |  |  | 979 |
Asia Pacific |  | 295 |  |  | 274 |
Total revenue |  | $ | 3,143 |  |  | $ | 3,090 |
The following table summarizes revenue from contracts with customers by principal service line (in millions):
|  | Three Months Ended March 31
|  | 2019 |  | 2018
Commercial Risk Solutions |  | $ | 1,118 |  |  | $ | 1,184 |
Reinsurance Solutions |  | 788 |  |  | 742 |
Retirement Solutions |  | 420 |  |  | 424 |
Health Solutions |  | 486 |  |  | 451 |
Data & Analytic Services |  | 336 |  |  | 294 |
Elimination |  | (5 | ) |  | (5 | )
Total revenue |  | $ | 3,143 |  |  | $ | 3,090 |
Capitalized Contract Cost | An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
As of |  | March 31, 2019 |  | December 31, 2018
Balance at beginning of period |  | $ | 156 |  |  | $ | 145 |
Additions |  | 9 |  |  | 53 |
Amortization |  | (11 | ) |  | (41 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | 1 |  |  | (1 | )
Balance at end of period |  | $ | 155 |  |  | $ | 156 |
An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
As of |  | March 31, 2019 |  | December 31, 2018
Balance at beginning of period |  | $ | 329 |  |  | $ | 298 |
Additions |  | 346 |  |  | 1,504 |
Amortization |  | (439 | ) |  | (1,465 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | — |  |  | (8 | )
Balance at end of period |  | $ | 236 |  |  | $ | 329 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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