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Accounts and Notes Receivable Allowance Rollforward (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Receivables [Abstract]  
Accounts Receivable, Allowance for Credit Loss, Beginning Balance $ 174
Additions charged to expenses 60
Write-offs charged against allowance (1)
Recoveries collected (30)
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 203