Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment [Table Text Block]

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



	September 30, 2012		December 31, 2011
Buildings, machinery and equipment	$	15,150	$	15,074
Geothermal properties	1,212		1,163
Other	158		156
	16,520		16,393
Less: Accumulated depreciation	4,518		4,158
	12,002		12,235
Land	91		91
Construction in progress	1,036		693
Property, plant and equipment, net	$	13,129	$	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 certain components of 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 September 30, 2012, are as follows (in millions):



2012	$	114
2013	527
2014	452
2015	461
2016	375
Thereafter	2,270
Total	$	4,199

Schedule of Components of Restricted Cash

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



	September 30, 2012						December 31, 2011
	Current		Non-Current		Total		Current		Non-Current		Total
Debt service⁽¹⁾	$	22	$	42	$	64	$	11	$	42	$	53
Rent reserve	3		—		3		—		—		—
Construction/major maintenance	37		11		48		33		10		43
Security/project/insurance	101		8		109		79		—		79
Other	—		2		2		16		3		19
Total	$	163	$	63	$	226	$	139	$	55	$	194

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(1)	At September 30, 2012 and December 31, 2011, amounts restricted for debt service included approximately $24 million and $25 million, respectively, of repurchase agreements with a financial institution containing maturity dates greater than one year.

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tabular disclosure of the cash and cash items which are restricted as to withdrawal or usage. The provisions of any restrictions are described in a note to the financial statements. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.

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