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Receivables - Schedule of Allowance for Doubtful Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Customer Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 20	$ 39	$ 46
Provision for doubtful accounts	2	3	2
Write off of uncollectible accounts	(3)	(19)	(8)
Recoveries of prior write-offs	(2)	(3)	(1)
Other	(3)
Balance at end of year	14	20	39
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	47	74	79
Provision for doubtful accounts	8	29	9
Write off of uncollectible accounts	(4)	(39)	(3)
Recoveries of prior write-offs	(7)	(10)	(6)
Other	(3)	(7)	(5)
Balance at end of year	$ 41	$ 47	$ 74