Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment [Table Text Block]

Property, Plant and Equipment, Net — At June 30, 2012 and December 31, 2011, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):

	June 30, 2012		December 31, 2011
Buildings, machinery and equipment	$	15,154	$	15,074
Geothermal properties	1,199		1,163
Other	157		156
	16,510		16,393
Less: Accumulated depreciation	4,405		4,158
	12,105		12,235
Land	90		91
Construction in progress	914		693
Property, plant and equipment, net	$	13,109	$	13,019

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Leases — We have contracts, such as certain tolling agreements, which we account for as operating leases under U.S. GAAP. Generally, we levelize these contract revenues on a straight-line basis over the term of the contract. The total contractual future minimum lease rentals for our contracts accounted for as operating leases, excluding tolling agreements related to power plants under construction, at June 30, 2012, are as follows (in millions):

2012	$	285
2013	527
2014	465
2015	481
2016	396
Thereafter	2,312
Total	$	4,466

Schedule of Components of Restricted Cash

The table below represents the components of our restricted cash as of June 30, 2012 and December 31, 2011 (in millions):

	June 30, 2012						December 31, 2011
	Current		Non-Current		Total		Current		Non-Current		Total
Debt service(1)	$	16	$	42	$	58	$	11	$	42	$	53
Rent reserve	7		—		7		—		—		—
Construction/major maintenance	47		2		49		33		10		43
Security/project/insurance	54		5		59		79		—		79
Other	—		2		2		16		3		19
Total	$	124	$	51	$	175	$	139	$	55	$	194

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(1) At both June 30, 2012 and December 31, 2011, amounts restricted for debt service included approximately $25 million of repurchase agreements with a financial institution containing maturity dates greater than one year.