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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangible Assets |
Schedule of Other Intangible Assets | Our other intangible assets consisted of the following as of December 31 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Customer |  | Covenants |  | Licenses, |  | ​ | ​
​ | ​ | and Supplier | ​ | Not-to- | ​ | Permits | ​ | ​ | ​
​ |  | Relationships |  | Compete |  | and Other |  | Total
2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Intangible assets | ​ | $ | 906 | ​ | $ | 72 | ​ | $ | 110 | ​ | $ | 1,088
Less: Accumulated amortization | ​ |  | (469) | ​ |  | (36) | ​ |  | (62) | ​ |  | (567)
​ | ​ | $ | 437 | ​ | $ | 36 | ​ | $ | 48 | ​ | $ | 521
2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Intangible assets | ​ | $ | 949 | ​ | $ | 60 | ​ | $ | 109 | ​ | $ | 1,118
Less: Accumulated amortization | ​ | ​ | (461) | ​ | ​ | (24) | ​ | ​ | (61) | ​ | ​ | (546)
​ | ​ | $ | 488 | ​ | $ | 36 | ​ | $ | 48 | ​ | $ | 572

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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