Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2012

Summary of Significant Accounting Policies [Abstract]

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 March 31, 2012, are as follows (in millions):



2012	$	395
2013	527
2014	452
2015	461
2016	375
Thereafter	2,269
Total	$	4,479

Schedule of Components of Restricted Cash

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



	March 31, 2012						December 31, 2011
	Current		Non-Current		Total		Current		Non-Current		Total
Debt service⁽¹⁾	$	14	$	41	$	55	$	11	$	42	$	53
Rent reserve	3		—		3		—		—		—
Construction/major maintenance	38		7		45		33		10		43
Security/project/insurance	51		1		52		79		—		79
Other	13		3		16		16		3		19
Total	$	119	$	52	$	171	$	139	$	55	$	194

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

- 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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