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Credit Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]    
Accounts and notes receivable $ 4,852 $ 8,510
Allowance for doubtful accounts $ 39 $ 41
Accounts and notes receivable, percent outstanding less than 60 days (more than) 99.00%