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Accounts Receivable, Net	6 Months Ended
Accounts Receivable, Net	Jun. 30, 2022
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 June 30, 2022 and December 31, 2021, $32 million and $40 million, respectively, of such allowances had been recorded.