|
Segment Information (Details) (USD $) In Millions, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Jun. 30, 2014
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
$ 1,646us-gaap_Revenues |
|
$ 1,965us-gaap_Revenues |
|
|
| Commodity Margin |
535cpn_CommodityMargin |
[1] |
645cpn_CommodityMargin |
[1] |
|
| Add: Mark-to-market commodity activity, net and other |
101cpn_MarkToMarketCommodityActivityNetAndOtherRevenue |
[2] |
(37)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue |
[2] |
|
| Plant operating expense |
260us-gaap_OperatingCostsAndExpenses |
|
265us-gaap_OperatingCostsAndExpenses |
|
|
| Depreciation and amortization expense |
158us-gaap_DepreciationAndAmortization |
|
153us-gaap_DepreciationAndAmortization |
|
|
| Sales, general and other administrative expense |
37us-gaap_SellingGeneralAndAdministrativeExpense |
|
33us-gaap_SellingGeneralAndAdministrativeExpense |
|
|
| Other operating expenses |
20us-gaap_OtherCostAndExpenseOperating |
|
22us-gaap_OtherCostAndExpenseOperating |
|
|
| (Income) loss from unconsolidated investments in power plants |
(5)us-gaap_IncomeLossFromEquityMethodInvestments |
|
(9)us-gaap_IncomeLossFromEquityMethodInvestments |
|
|
| Income from operations |
166us-gaap_OperatingIncomeLoss |
|
144us-gaap_OperatingIncomeLoss |
|
|
| Interest expense, net of interest income |
153us-gaap_InterestRevenueExpenseNet |
|
165us-gaap_InterestRevenueExpenseNet |
|
|
| Debt extinguishment costs and other (income) expense, net |
21cpn_DebtExtinguishmentCostsAndOtherIncomeExpenseNet |
|
11cpn_DebtExtinguishmentCostsAndOtherIncomeExpenseNet |
|
|
| Loss before income taxes |
(8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
|
(32)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
|
|
| Lease levelization |
(24)cpn_LeaseLevelization |
|
(29)cpn_LeaseLevelization |
|
|
| Contract amortization |
4cpn_ContractAmortization |
|
4cpn_ContractAmortization |
|
|
| West [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
517us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
493us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Commodity Margin |
218cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_WestMember |
[1] |
202cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_WestMember |
[1] |
|
| Add: Mark-to-market commodity activity, net and other |
119cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_WestMember |
[2] |
29cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_WestMember |
[2] |
|
| Plant operating expense |
106us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
105us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Depreciation and amortization expense |
67us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
60us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Sales, general and other administrative expense |
10us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
10us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Other operating expenses |
10us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
12us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| (Income) loss from unconsolidated investments in power plants |
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Income from operations |
144us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
44us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Texas [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
584us-gaap_Revenues / us-gaap_StatementGeographicalAxis = stpr_TX |
|
659us-gaap_Revenues / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Commodity Margin |
149cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = stpr_TX |
[1] |
121cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = stpr_TX |
[1] |
|
| Add: Mark-to-market commodity activity, net and other |
41cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = stpr_TX |
[2] |
(46)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = stpr_TX |
[2] |
|
| Plant operating expense |
89us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = stpr_TX |
|
90us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Depreciation and amortization expense |
49us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = stpr_TX |
|
42us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Sales, general and other administrative expense |
17us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = stpr_TX |
|
12us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Other operating expenses |
2us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = stpr_TX |
|
2us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| (Income) loss from unconsolidated investments in power plants |
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = stpr_TX |
|
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Income from operations |
33us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = stpr_TX |
|
(71)us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| East [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
552us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
844us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Commodity Margin |
168cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_EastMember |
[1] |
322cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_EastMember |
[1] |
|
| Add: Mark-to-market commodity activity, net and other |
(52)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_EastMember |
[2] |
(11)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_EastMember |
[2] |
|
| Plant operating expense |
72us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
79us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Depreciation and amortization expense |
42us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
51us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Sales, general and other administrative expense |
10us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
12us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Other operating expenses |
8us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
7us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| (Income) loss from unconsolidated investments in power plants |
(5)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
(9)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Income from operations |
(11)us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
171us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Geography Consolidation and Elimination [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
(7)us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
(31)us-gaap_Revenues / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Commodity Margin |
0cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
[1] |
0cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
[1] |
|
| Add: Mark-to-market commodity activity, net and other |
(7)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
[2] |
(9)cpn_MarkToMarketCommodityActivityNetAndOtherRevenue / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
[2] |
|
| Plant operating expense |
(7)us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
(9)us-gaap_OperatingCostsAndExpenses / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Depreciation and amortization expense |
0us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
0us-gaap_DepreciationAndAmortization / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Sales, general and other administrative expense |
0us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
(1)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Other operating expenses |
0us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
1us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| (Income) loss from unconsolidated investments in power plants |
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Income from operations |
0us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
0us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Six Power Plants [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Commodity Margin |
|
|
39cpn_CommodityMargin / us-gaap_StatementGeographicalAxis = cpn_SixPowerPlantsMember |
[1] |
|
| Operating Segments [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
1,646us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
|
1,965us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
|
|
| Operating Segments [Member] | West [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
515us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
491us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Operating Segments [Member] | Texas [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
581us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = stpr_TX |
|
647us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Operating Segments [Member] | East [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
550us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
827us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Operating Segments [Member] | Geography Consolidation and Elimination [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Intersegment Eliminations [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
|
0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
|
|
| Intersegment Eliminations [Member] | West [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
2us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
2us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_WestMember |
|
|
| Intersegment Eliminations [Member] | Texas [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
3us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = stpr_TX |
|
12us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = stpr_TX |
|
|
| Intersegment Eliminations [Member] | East [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
2us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
17us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_EastMember |
|
|
| Intersegment Eliminations [Member] | Geography Consolidation and Elimination [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Operating revenues |
$ (7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
$ (31)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementGeographicalAxis = cpn_GeographyConsolidationandEliminationMember |
|
|
| Six Power Plants [Member] |
|
|
|
|
|
| Revenues from External Customers and Long-Lived Assets [Line Items] |
|
|
|
|
|
| Number of power plants disposed |
|
|
|
|
6 |
|
|
|