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Debt (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Costs, Net
Interest expense	$ 433	$ 345	$ 309
Amortization of deferred loan costs	5	17	6
Capitalized interest	(263)	(120)	(61)
Interest income	(17)	(13)	(12)
Total Financing costs, net	$ 158	$ 229	$ 242

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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