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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
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, 2021 and 2020, respectively, are as follows:
 20212020
Accounts and notes receivable$632 $579 
Allowance for doubtful accounts(36)(45)
Accounts and notes receivable, net$596 $534