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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] | Accounts and notes receivable as well as the Allowance for doubtful accounts, including balances attributable to our consolidated advertising cooperatives, as of December 31, 2020 and 2019, respectively, are as follows:
|  | 2020 |  | 2019
Accounts and notes receivable |  | $ | 579 |  |  | $ | 656 |
Allowance for doubtful accounts |  | (45) |  |  | (72) |
Accounts and notes receivable, net |  | $ | 534 |  |  | $ | 584 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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