Accounts Receivable

12 Months Ended

Dec. 31, 2017

Accounts receivable

Accounts receivable

6 – Accounts receivable

In millions	December 31,		2017		2016
Freight		$	828	$	752
Non-freight			172		151
Gross accounts receivable			1,000		903
Allowance for doubtful accounts			(16)		(28)
Net accounts receivable		$	984	$	875