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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 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):
|  | Years ended December 31
|  | 2018 |  | 2017 |  | 2016
Commercial Risk Solutions |  | $ | 4,652 |  |  | $ | 4,169 |  |  | $ | 3,929 |
Reinsurance Solutions |  | 1,563 |  |  | 1,429 |  |  | 1,361 |
Retirement Solutions |  | 1,865 |  |  | 1,755 |  |  | 1,707 |
Health Solutions |  | 1,596 |  |  | 1,515 |  |  | 1,370 |
Data & Analytic Services |  | 1,105 |  |  | 1,140 |  |  | 1,050 |
Elimination |  | (11 | ) |  | (10 | ) |  | (8 | )
Total revenue |  | $ | 10,770 |  |  | $ | 9,998 |  |  | $ | 9,409 |
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
|  | 2018 |  | 2017 |  | 2016
United States |  | $ | 4,677 |  |  | $ | 4,425 |  |  | $ | 3,981 |
Americas other than United States |  | 940 |  |  | 976 |  |  | 899 |
United Kingdom |  | 1,555 |  |  | 1,436 |  |  | 1,354 |
Europe, Middle East, & Africa other than United Kingdom |  | 2,413 |  |  | 2,025 |  |  | 1,760 |
Asia Pacific |  | 1,185 |  |  | 1,136 |  |  | 1,415 |
Total revenue |  | $ | 10,770 |  |  | $ | 9,998 |  |  | $ | 9,409 |
Capitalized Contract Cost | An analysis of the changes in the net carrying amount of costs to obtain contracts with customers is as follows (in millions):
|  | 2018
Balance at beginning of period (1) |  | $ | 145 |
Additions |  | 53 |
Amortization |  | (41 | )
Impairment |  | — |
Foreign currency translation and other |  | (1 | )
Balance at end of period |  | $ | 156 |
(1) | Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $145 million of costs to obtain contracts with customers.
An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers is as follows (in millions):
|  | 2018
Balance at beginning of period (1) |  | $ | 298 |
Additions |  | 1,504 |
Amortization |  | (1,465 | )
Impairment |  | — |
Foreign currency translation and other |  | (8 | )
Balance at end of period |  | $ | 329 |
(1) | Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $298 million of costs to fulfill contracts with customers.

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