Accounts and Notes Receivable Allowance Rollforward (Details) $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($)
Receivables [Abstract]
Accounts Receivable, Allowance for Credit Loss, Beginning Balance	$ 174
Additions charged to expenses	124
Write-offs charged against allowance	(6)
Recoveries collected	(78)
Other deductions against allowance	(7)
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 207

Amount of allowance for credit loss on accounts receivable, classified as current.

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- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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