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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue from contracts with customers by principal service line (in millions):
|  | Three months ended June 30, 2018 |  | Six months ended June 30, 2018
Commercial Risk Solutions |  | $ | 1,166 |  |  | $ | 2,350 |
Reinsurance Solutions |  | 380 |  |  | 1,122 |
Retirement Solutions |  | 431 |  |  | 855 |
Health Solutions |  | 309 |  |  | 760 |
Data & Analytic Services |  | 277 |  |  | 571 |
Elimination |  | (2 | ) |  | (7 | )
Total revenue |  | $ | 2,561 |  |  | $ | 5,651 |
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 June 30, 2018 |  | Six months ended June 30, 2018
United States |  | $ | 1,125 |  |  | $ | 2,241 |
Americas other than United States |  | 243 |  |  | 480 |
United Kingdom |  | 413 |  |  | 897 |
Europe, Middle East, & Africa other than United Kingdom |  | 493 |  |  | 1,472 |
Asia Pacific |  | 287 |  |  | 561 |
Total revenue |  | $ | 2,561 |  |  | $ | 5,651 |
Capitalized Contract Cost | The changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
|  | Three months ended June 30, 2018 |  | Six months ended June 30, 2018
Balance at beginning of period (1) |  | $ | 240 |  |  | $ | 298 |
Additions |  | 341 |  |  | 711 |
Amortization |  | (353 | ) |  | (785 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | (12 | ) |  | (8 | )
Balance at end of period |  | $ | 216 |  |  | $ | 216 |
(1) | Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $298 million of costs to fulfill contracts with customers.
The changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
|  | Three months ended June 30, 2018 |  | Six months ended June 30, 2018
Balance at beginning of period (1) |  | $ | 144 |  |  | $ | 145 |
Additions |  | 13 |  |  | 21 |
Amortization |  | (11 | ) |  | (21 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | (2 | ) |  | (1 | )
Balance at end of period |  | $ | 144 |  |  | $ | 144 |
(1) | Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $145 million of costs to obtain contracts with customers.

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- Definition Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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