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Allowance for Losses on Financial Assets
12 Months Ended
Dec. 31, 2020
Credit Loss [Abstract]  
Credit Loss, Financial Instrument Allowances for Losses on Financial Assets
Upon adoption of ASU 2016-13, we recorded a $162 cumulative-effect adjustment to retained earnings to increase our allowances for credit losses, resulting in a balance of $337 as of January 1, 2020. The change in allowances for expected credit losses for the year ended December 31, 2020 consisted of the following:
Accounts receivable, netUnbilled receivables, netOther Current Assets, netCustomer financing, netOther Assets, netTotal
Balance at January 1, 2020
($138)($81)($38)($5)($75)($337)
Changes in estimates
(314)(48)(34)(12)(66)(474)
Write-offs8 8 
Recoveries1 1 
Balance at December 31, 2020($444)($129)($72)($17)($140)($802)