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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2018
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 September 30, 2018 |  | Nine months ended September 30, 2018
United States |  | $ | 1,215 |  |  | $ | 3,456 |
Americas other than United States |  | 203 |  |  | 683 |
United Kingdom |  | 264 |  |  | 1,161 |
Europe, Middle East, & Africa other than United Kingdom |  | 399 |  |  | 1,871 |
Asia Pacific |  | 268 |  |  | 829 |
Total revenue |  | $ | 2,349 |  |  | $ | 8,000 |
The following table summarizes revenue from contracts with customers by principal service line (in millions):
|  | Three months ended September 30, 2018 |  | Nine months ended September 30, 2018
Commercial Risk Solutions |  | $ | 1,029 |  |  | $ | 3,379 |
Reinsurance Solutions |  | 279 |  |  | 1,401 |
Retirement Solutions |  | 501 |  |  | 1,356 |
Health Solutions |  | 278 |  |  | 1,038 |
Data & Analytic Services |  | 263 |  |  | 834 |
Elimination |  | (1 | ) |  | (8 | )
Total revenue |  | $ | 2,349 |  |  | $ | 8,000 |
Capitalized Contract Cost | The changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
|  | Three months ended September 30, 2018 |  | Nine months ended September 30, 2018
Balance at beginning of period (1) |  | $ | 144 |  |  | $ | 145 |
Additions |  | 16 |  |  | 37 |
Amortization |  | (9 | ) |  | (30 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | (1 | ) |  | (2 | )
Balance at end of period |  | $ | 150 |  |  | $ | 150 |
(1) | Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $145 million of costs to obtain contracts with customers.
The changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
|  | Three months ended September 30, 2018 |  | Nine months ended September 30, 2018
Balance at beginning of period (1) |  | $ | 216 |  |  | $ | 298 |
Additions |  | 332 |  |  | 1,043 |
Amortization |  | (305 | ) |  | (1,090 | )
Impairment |  | — |  |  | — |
Foreign currency translation and other |  | 5 |  |  | (3 | )
Balance at end of period |  | $ | 248 |  |  | $ | 248 |
(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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