Accounts receivable

12 Months Ended

Dec. 31, 2011

Notes To Financial Statements [Abstract]

Accounts receivable

4 – Accounts receivable

In millions	December 31,	2011		2010
Freight		$	630	$	585
Non-freight			206		211
Gross accounts receivable			836		796
Allowance for doubtful accounts			(16)		(21)
Net accounts receivable		$	820	$	775

The Company had a five-year agreement to sell an undivided co-ownership interest in a revolving pool of freight receivables to an unrelated trust for maximum cash proceeds of $600 million. The agreement expired on May 31, 2011 and was not renewed. As at December 31, 2010, the Company had no receivables sold under this program.