Consolidated Condensed Balance Sheets (Unaudited) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents ($289 and $345 attributable to VIEs)	$ 1,147	$ 1,327
Accounts receivable, net of allowance of $2 and $2	738	669
Margin deposits and other prepaid expenses	170	221
Restricted cash, current ($123 and $177 attributable to VIEs)	175	195
Derivative assets, current	569	725
Inventory and other current assets	285	292
Total current assets	3,084	3,429
Property, plant and equipment, net	13,033	12,978
Restricted cash, net of current portion ($44 and $52 attributable to VIEs.)	42	53
Investments	84	80
Long-term derivative assets	110	170
Other assets	545	546
Total assets	16,898	17,256
Current liabilities:
Accounts payable	602	514
Accrued interest payable	203	132
Debt, current portion ($193 and $132 attributable to VIEs)	126	152
Derivatives liabilities, current	643	718
Other current liabilities	298	273
Total current liabilities	1,872	1,789
Debt, net of current portion ($2,688 and $4,069 attributable to VIEs)	10,190	10,104
Deferred income taxes, net of current	1	77
Long-term derivative liabilities	221	370
Other long-term liabilities	225	247
Total liabilities	12,509	12,587
Commitments and contingencies (see Note 12)
Stockholders' equity:
Preferred stock, $.001 par value per share; 100,000,000 shares authorized; none issued and outstanding
Common stock, $.001 par value per share; 1,400,000,000 shares authorized; 446,415,081 and 444,883,356 shares issued, respectively, and 445,843,601 and 444,435,198 shares outstanding, respectively	1	1
Treasury stock, at cost, 571,480 and 448,158 shares, respectively	(7)	(5)
Additional paid-in capital	12,293	12,281
Accumulated deficit	(7,876)	(7,509)
Accumulated other comprehensive loss	(83)	(125)
Total Calpine stockholders' equity	4,328	4,643
Noncontrolling interest	61	26
Total stockholders' equity	4,389	4,669
Total liabilties and stockholders' equity	$ 16,898	$ 17,256