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Schedule II
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
DescriptionBalance at
Beginning of Year		Cumulative effect adjustment for adoption of ASU 2016-13 (a)Credit loss exposure (a)Write-offs (c)Charges to
(Deductions from)
Other Accounts (d)		Balance at
End of Year
Year Ended December 31, 2020:
Allowances for credit losses (b)$74 10 49 (27)— $105 
Year Ended December 31, 2019:
Allowances for uncollectible accounts$68 n/a23 (17)— $74 
Year Ended December 31, 2018:
Allowances for uncollectible accounts (e)$98 n/a19 (19)(30)$68 
(a) Following the adoption of FASB ASC Topic 326 as of January 1, 2020, we record credit loss reserves to Allowance for credit losses when we establish Trade accounts receivable if credit losses are expected over the asset's contractual life. As a result of the adoption of FASB ASC Topic 326, we recorded a net reduction to opening retained earnings on January 1, 2020 related to the establishment of credit loss reserves on Trade accounts receivable and recorded a corresponding increase in the Allowance for credit losses, a contra Trade accounts receivable account. Prior period amounts have not been restated and are presented in accordance with FASB ASC Topic 310. Amounts shown within credit loss exposure above were established through selling, general and administrative expense.
(b) Beginning in 2020, Allowance for uncollectible accounts are referred to as Allowance for credit losses within our consolidated balance sheets.
(c) Represents actual write-offs of uncollectible accounts.
(d) Represents net change in allowances for sales returns, recorded as contra-revenue.
(e) Following the adoption of FASB ASC Topic 606 as of January 1, 2018, the allowance for sales returns has been reclassified from Trade accounts receivable, net to Other current liabilities within the consolidated balance sheets and is not included in the ending balance for 2018 above. Prior period balances remain unchanged.