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Accounts Receivable, Net	9 Months Ended
Accounts Receivable, Net	Sep. 30, 2020
Receivables [Abstract]
Accounts Receivable, Net	Accounts Receivable, Net Accounts receivable, net consists of freight and other receivables, reduced by an allowance for credit losses which is based upon expected collectability. As of September 30, 2020 and December 31, 2019, $56 million and $51 million, respectively, of such allowance had been recorded.