Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Power Plant and Land and Other Operating Leases

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

2013	$	548
2014	446
2015	455
2016	397
2017	359
Thereafter	2,078
Total	$	4,283

Future minimum lease payments under these leases are as follows (in millions):

	Initial Year	2013		2014		2015		2016		2017		Thereafter		Total
Land and other operating leases	various	$	14	$	14	$	14	$	15	$	15	$	228	$	300
Power plant operating leases:
Greenleaf	1998	$	7	$	3	$	—	$	—	$	—	$	—	$	10
KIAC	2000	24		24		23		22		22		52		167
Total power plant leases		$	31	$	27	$	23	$	22	$	22	$	52	$	177
Total leases		$	45	$	41	$	37	$	37	$	37	$	280	$	477

Schedule of Future Minimum Lease Payments for Office and Equipment Leases

Future minimum lease payments under these leases are as follows (in millions):

2013	$	12
2014	12
2015	12
2016	12
2017	12
Thereafter	31
Total	$	91

Schedule of Guarantor Obligations

At December 31, 2012, guarantees of subsidiary debt, standby letters of credit and surety bonds to third parties and guarantees of subsidiary operating lease payments and their respective expiration dates were as follows (in millions):

Guarantee Commitments	2013		2014		2015		2016		2017		Thereafter		Total
Guarantee of subsidiary debt(1)	$	47	$	36	$	37	$	36	$	26	$	209	$	391
Standby letters of credit(2)(4)	536		41		—		—		19		30		626
Surety bonds(3)(4)(5)	—		—		—		—		—		4		4
Guarantee of subsidiary operating lease payments(4)	7		3		—		—		—		—		10
Total	$	590	$	80	$	37	$	36	$	45	$	243	$	1,031

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(1) Represents Calpine Corporation guarantees of certain power plant capital leases and related interest. All guaranteed capital leases are recorded on our Consolidated Balance Sheets.

(2) The standby letters of credit disclosed above represent those disclosed in Note 6.

(3) The majority of surety bonds do not have expiration or cancellation dates.

(4) These are contingent off balance sheet obligations.

(5) As of December 31, 2012, $3 million of cash collateral is outstanding related to these bonds.