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Accounts Receivable and Notes Receivable and Credit Quality of Receivables (Tables)
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Summary of components of current and long-term accounts and notes receivable, net The following table summarizes the components of current and long-term receivables, net:
As of December 31,
20202019
Current:
Receivables$697 $791 
Allowance for credit losses(81)(36)
Current receivables, net616 755 
Long-term:
Receivables25 53 
Allowance for credit losses(5)— 
Long-term receivables, net20 53 
Total receivables, net$636 $808 
Summary of the components of total notes receivable, net
As of
December 31, 2020Balances over 90 days past dueDecember 31, 2019Balances over 90 days past due
Receivables:
U.S. and Canada$443 $88 $534 $65 
International279 52 310 55 
     Total receivables722 140 844 120 
Receivables allowance
U.S. and Canada(43)(26)(13)(8)
International(43)(24)(23)(23)
Total receivables allowance(86)(50)(36)(31)
Receivables, net$636 $90 $808 $89 
Schedule of activity in allowance for notes receivable The activity in our allowance for receivable credit losses for each of the years ended December 31, 2020 and 2019 is as follows:
20202019
TotalU.S and CanadaInternationalTotal
Beginning allowance for credit losses(1)
$(42)$(14)$(28)$(40)
Provision(56)(31)(25)(9)
Charge-offs and recoveries12 2 10 13 
Allowance for credit losses as of December 31$(86)$(43)$(43)$(36)
(1) Reflects $6 million related to implementation of ASC 326 for the 2020 beginning balance