Receivables (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Allowance for Doubtful Accounts

The following table details the changes in the allowance for doubtful accounts related to customer receivables and other receivables:

	Customer receivables						Other receivables
December 31,	2012			2011			2012			2011
Balance at beginning of year	$	46		$	46		$	79		$	87
Provision for doubtful accounts		2			19			9			7
Write off of uncollectible accounts		(8	)		(14	)		(3	)		(3	)
Recoveries of prior write-offs		(1	)		(3	)		(6	)		(5	)
Other		-			(2	)		(5	)		(7	)
Balance at end of year	$	39		$	46		$	74		$	79