Debt - Financing Costs, Net (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Interest expense	$ 571	$ 509	$ 433
Amortization of deferred loan costs	8	7	5
Capitalized interest	(374)	(334)	(263)
Gain on extinguishment of debt	(16)
Interest income	(15)	(17)	(17)
Financing costs, net	$ 174	$ 165	$ 158