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v3.20.2

Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2020
Basis of Presentation |
Summary of allowance for doubtful accounts | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Balance as of January 1, | ​ | $ | 28 | ​ | $ | 29
Adoption of new accounting standard | ​ |  | (1) | ​ |  | —
Additions charged to expense | ​ |  | 40 | ​ |  | 27
Accounts written-off, net of recoveries | ​ |  | (29) | ​ |  | (31)
Acquisitions, divestitures and other, net | ​ |  | (4) | ​ |  | 2
Balance as of September 30, | ​ | $ | 34 | ​ | $ | 27

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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