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Debt and Financing Costs (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Costs, Net
Interest expense	$ 131	$ 109	$ 239	$ 217
Amortization of deferred loan costs	2	1	3	3
Capitalized interest	(85)	(63)	(151)	(124)
Interest income	(3)	(6)	(6)	(10)
Financing costs, net	$ 45	$ 41	$ 85	$ 86

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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