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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income (loss) $ 790 $ 28 $ (321)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization(1) [1] 781 848 921
(Gain) loss on extinguishment of debt 22 (32) 38
Deferred income taxes 95 47 14
Impairment losses 84 10 41
(Gain) on sale of assets, net (10) 0 (27)
Mark-to-market activity, net [2] (275) 205 169
(Income) from unconsolidated subsidiaries (22) (24) (22)
Return on investments from unconsolidated subsidiaries 21 35 28
Stock-based compensation expense 0 57 42
Other 3 29 (5)
Change in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable 265 (101) (108)
Accounts payable (271) 164 70
Margin deposits and other prepaid expense (57) (134) 115
Other assets and liabilities, net 144 (82) (15)
Derivative instruments, net (14) 51 9
Net cash provided by operating activities 1,556 1,101 949
Cash flows from investing activities:      
Purchases of property, plant and equipment (584) (415) (305)
Proceeds from sale of power plants and other [3] 322 11 162
Return of investment from unconsolidated subsidiaries 5 18 0
Other (1) (6) 43
Net cash used in investing activities (258) (392) (211)
Cash flows from financing activities:      
Borrowings under CCFC Term Loan and First Lien Term Loans 1,687 0 1,395
Repayments of CCFC Term Loans and First Lien Term Loans (1,507) (41) (2,150)
Borrowings under First Lien Notes 1,250 0 560
Repayments of Senior Debt (811) 0 0
Proceeds from Unsecured Notes Payable 1,400 0 0
Repayments of Senior Unsecured Notes (768) (355) (453)
Proceeds from Lines of Credit 342 525 440
Repayments of Lines of Credit (250) (495) (440)
Borrowings from project financing, notes payable and other 0 220 0
Repayments of project financing, notes payable and other (404) (470) (174)
Financing costs (67) (18) (60)
Stock repurchases 0 (79) 0
Dividends (1,151) 20  
Payments of Dividends [3] (1,151) (20) 0
Other 51 (13) (19)
Net cash used in financing activities (228) (746) (901)
Net increase (decrease) in cash, cash equivalents and restricted cash 1,070 (37) (163)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 406 [4] 443 [4] 606
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [4] 1,476 406 443
Cash paid during the period for:      
Interest, net of amounts capitalized 598 587 575
Income taxes 11 23 12
Supplemental disclosure of non-cash investing and financing activities:      
Purchase of King City Cogen Plant Lease [5] 0 0 15
Change in capital expenditures included in accounts payable 13 19 20
Long-term Debt 11,857 10,156  
Plant Tax Settlement Offset in Prepaid Assets (4) 0 0
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount (10) 0 0
Calpine Solutions and Champion Energy [Member]      
Cash flows from investing activities:      
Purchase of Granite Ridge Energy Center 0 0 (111)
King City Cogen Promissory Note [Member]      
Supplemental disclosure of non-cash investing and financing activities:      
Long-term Debt     $ 57
Merger Related Costs [Member]      
Cash flows from financing activities:      
Payments of Dividends $ 1 $ 20  
[1] Includes amortization included in Commodity revenue and Commodity expense associated with intangible assets and amortization recorded in interest expense associated with debt issuance costs and discounts
[2] In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes adjustments to reflect changes in credit default risk exposure.
[3] Dividends paid during the years ended December 31, 2019 and 2018, includes approximately $1 million and $20 million, respectively, in certain Merger-related costs incurred by CPN Management, our parent.
[4] Our cash and cash equivalents, restricted cash, current and restricted cash, net of current portion are stated as separate line items on our Consolidated Balance Sheets
[5] On April 3, 2017, we completed the purchase of the King City Cogeneration Plant lease in exchange for a three-year promissory note with a discounted value of $57 million. We recorded a net increase to property, plant and equipment, net on our Consolidated Balance Sheet of $15 million due to the increased value of the promissory note as compared to the carrying value of the lease.