Receivables (Tables)

12 Months Ended

Dec. 31, 2016

Transfers and Servicing [Abstract]

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,	2016			2015			2014			2016			2015			2014
Balance at beginning of year	$	8		$	6		$	8		$	34		$	24		$	28
Provision for doubtful accounts		7			4			4			6			8			8
Write off of uncollectible accounts		(3	)		(2	)		(3	)		(1	)		2			(4	)
Recoveries of prior write-offs		(1	)		-			(2	)		1			(1	)		(7	)
Other		2			-			(1	)		(8	)		1			(1	)
Balance at end of year	$	13		$	8		$	6		$	32		$	34		$	24