Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 1,610	$ 1,105
Funds deposited by counterparties	76	258
Restricted cash	237	292
Accounts receivable - trade, less allowance for doubtful accounts of $39 and $23	1,075	834
Inventory	393	308
Derivative instruments	2,677	4,216
Cash collateral paid in support of energy risk management activities	98	311
Prepayments and other current assets	217	273
Total current assets	6,383	7,597
Property, plant and equipment, net of accumulated depreciation of $5,194 and $4,570	15,866	13,621
Other Assets
Equity investments in affiliates	649	640
Note receivable - affiliate and capital leases, less current portion	78	342
Goodwill	1,886	1,886
Intangible assets, net of accumulated amortization of $1,628 and $1,452	1,188	1,419
Nuclear decommissioning trust fund	469	424
Derivative instruments	309	450
Other non-current assets	392	336
Total other assets	4,971	5,497
Total Assets	27,220	26,715
Current Liabilities
Current portion of long-term debt and capital leases	374	87
Accounts payable	1,246	808
Derivative instruments	2,462	3,751
Deferred income taxes	15	127
Cash collateral received in support of energy risk management activities	76	258
Accrued expenses and other current liabilities	604	640
Total current liabilities	4,777	5,671
Other Liabilities
Long-term debt and capital leases	10,968	9,745
Nuclear decommissioning reserve	349	335
Nuclear decommissioning trust liability	277	254
Deferred income taxes	1,092	1,389
Derivative instruments	561	464
Out-of-market commodity contracts	161	183
Other non-current liabilities	896	756
Total non-current liabilities	14,304	13,126
Total Liabilities	19,081	18,797
3.625% convertible perpetual preferred stock (at liquidation value, net of issuance costs)	249	249
Stockholders' Equity
Common stock	3	3
Additional paid-in capital	5,388	5,346
Retained earnings	4,002	3,987
Less treasury stock, at cost - 76,505,718 and 76,664,199 shares, respectively	(1,920)	(1,924)
Accumulated other comprehensive (loss)/income	(68)	74
Noncontrolling interest	485	183
Total Stockholders' Equity	7,890	7,669
Total Liabilities and Stockholders' Equity	$ 27,220	$ 26,715

Sum of accrued expenses and other current liabilities. Accrued expenses are the carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, that are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Other current liabilities are the aggregate carrying amount, as of the balance sheet date, of current liabilities not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer).

No definition available.