Debt and Interest Expense - Interest Expense Table (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Expense [Abstract]
Current debt, long-term debt, and other	$ 949	$ 963	$ 986
Capitalized interest	(263)	(221)	(147)
Interest expense	$ 686	$ 742	$ 839