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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2013 |  | $ | 202 |  |  | $ | 109 |  |  | $ | 22 |  |  | $ | 333 |
Additions |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | 20 |
Currency translation adjustments and other |  |  | (2 | ) |  |  | (8 | ) |  |  | 3 |  |  |  | (7 | )
Balance at December 31, 2014 |  |  | 220 |  |  |  | 101 |  |  |  | 25 |  |  |  | 346 |
Additions |  |  | 173 |  |  |  | 4 |  |  |  | 99 |  |  |  | 276 |
Impairment |  |  | (393 | ) |  |  | — |  |  |  | — |  |  |  | (393 | )
Currency translation adjustments and other |  |  | — |  |  |  | (17 | ) |  |  | (7 | ) |  |  | (24 | )
Balance at December 31, 2015 |  | $ | — |  |  | $ | 88 |  |  | $ | 117 |  |  | $ | 205 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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