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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Goodwill Identified by Segment | Goodwill is identified by segment as follows (in millions):
|  | United States |  |  | Canada |  |  | International |  |  | Total |
Balance at December 31, 2016 (1) |  | $ | 117 |  |  | $ | 91 |  |  | $ | 103 |  |  | $ | 311 |
Additions |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Foreign currency translation adjustments |  |  | — |  |  |  | 7 |  |  |  | 8 |  |  |  | 15 |
Balance at December 31, 2017 |  | $ | 119 |  |  |  | 98 |  |  |  | 111 |  |  |  | 328 |
Foreign currency translation adjustments |  |  | — |  |  | $ | (8 | ) |  | $ | (6 | ) |  |  | (14 | )
Balance at December 31, 2018 |  | $ | 119 |  |  | $ | 90 |  |  | $ | 105 |  |  | $ | 314 |
| (1) | Net of prior years’ United States accumulated impairment of $393 million.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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