Condensed Consolidated Balance Sheets (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 1,127		$ 2,951
Funds deposited by counterparties	259		408
Restricted cash	441		8
Accounts receivable - trade, less allowance for doubtful accounts of $33 and $25	1,042		734
Inventory	320		453
Derivative instruments valuation	2,588		1,964
Cash collateral paid in support of energy risk management activities	316		323
Prepayments and other current assets	245		296
Total current assets	6,338		7,137
Property, plant and equipment, net of accumulated depreciation of $4,371 and $3,796	12,843		12,517
Other Assets
Equity investments in affiliates	576		536
Note receivable - affiliate and capital leases, less current portion	327		384
Goodwill	1,859		1,868
Intangible assets, net of accumulated amortization of $1,345 and $1,064	1,561		1,776
Nuclear decommissioning trust fund	399		412
Derivative instruments valuation	533		758
Restricted cash supporting Funded Letter of Credit Facility	0		1,300
Other non-current assets	324		208
Total other assets	5,579		7,242
Total Assets	24,760		26,896
Current Liabilities
Current portion of long-term debt and capital leases	81		463
Accounts payable	974		783
Derivative instruments valuation	2,089		1,685
Deferred income taxes	65		108
Cash collateral received in support of energy risk management activities	259		408
Accrued expenses and other current liabilities	527		773
Total current liabilities	3,995		4,220
Other Liabilities
Long-term debt and capital leases	9,208		8,748
Funded letter of credit	0	[1]	1,300	[1]
Nuclear decommissioning reserve	331		317
Nuclear decommissioning trust liability	237		272
Deferred income taxes	1,588		1,989
Derivative instruments valuation	408		365
Out-of-market contracts	191		223
Other non-current liabilities	622		1,142
Total non-current liabilities	12,585		14,356
Total Liabilities	16,580		18,576
3.625% convertible perpetual preferred stock (at liquidation value, net of issuance costs)	248		248
Commitments and Contingencies
Stockholders' Equity
Common stock	3		3
Additional paid-in capital	5,348		5,323
Retained earnings	4,099		3,800
Less treasury stock, at cost - 65,568,119 and 56,808,672 shares, respectively	(1,881)		(1,503)
Accumulated other comprehensive income	201		432
Noncontrolling interest	162		17
Total Stockholders' Equity	7,932		8,072
Total Liabilities and Stockholders' Equity	$ 24,760		$ 26,896

[1] On July 1, 2011, the Term loan facility, due 2013-2015 and Funded letter of credit were repaid and replaced, as described below under Senior Credit Facility.