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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Accounts and notes receivable, net
 
 
2019
 
2018
Accounts and notes receivable
 
$
656

 
$
592

Allowance for doubtful accounts
 
(72
)
 
(31
)
Accounts and notes receivable, net
 
$
584

 
$
561