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Debt - Financing Costs, Net (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long Term Debt And Equity Financings [Line Items]
Interest expense	$ 509	$ 433	$ 345
Amortization of deferred loan costs	7	5	17
Capitalized interest	(334)	(263)	(120)
Interest income	(17)	(17)	(13)
Financing costs, net	$ 165	$ 158	$ 229

The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.

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