Receivables - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Customer Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 8	$ 6	$ 8
Provision for doubtful accounts	7	4	4
Write off of uncollectible accounts	(3)	(2)	(3)
Recoveries of prior write-offs	(1)		(2)
Other	2		(1)
Balance at end of year	13	8	6
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	34	24	28
Provision for doubtful accounts	6	8	8
Write off of uncollectible accounts	(1)	2	(4)
Recoveries of prior write-offs	1	(1)	(7)
Other	(8)	1	(1)
Balance at end of year	$ 32	$ 34	$ 24