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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities    
Net income (loss) $ 129 $ 883
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities    
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization 640 694
Deferred income taxes and amortization of ITCs (98) 9
Net fair value changes related to derivatives 356 (186)
Net realized and unrealized (gains) losses on NDT funds (44) (192)
Net realized and unrealized (gains) losses on equity investments 268 (47)
Other non-cash operating activities 47 (41)
Changes in assets and liabilities:    
Accounts receivable (15) 464
Inventories 98 114
Accounts payable and accrued expenses (290) (382)
Option premiums received (paid), net 26 74
Collateral received (posted), net (486) 297
Income taxes 120 159
Pension and non-pension postretirement benefit contributions (174) (177)
Other assets and liabilities (470) (2,392)
Net cash flows provided by (used in) operating activities 107 (723)
Cash flows from investing activities    
Capital expenditures (806) (738)
Proceeds from NDT fund sales 2,084 1,779
Investment in NDT funds (2,152) (1,847)
Collection of DPP, net 0 1,644
Acquisitions of assets and businesses (5) (14)
Other investing activities (7) 6
Net cash flows provided by (used in) investing activities (886) 830
Cash flows from financing activities    
Change in short-term borrowings 0 165
Proceeds from short-term borrowings with maturities greater than 90 days 0 200
Repayments of short-term borrowings with maturities greater than 90 days 0 (500)
Issuance of long-term debt 0 900
Retirement of long-term debt (57) (32)
Other financing activities (229) (38)
Net cash flows provided by (used in) financing activities (408) 84
Increase (decrease) in cash, restricted cash, and cash equivalents (1,187) 191
Cash, restricted cash, and cash equivalents at beginning of period 3,129 454
Cash, restricted cash, and cash equivalents at end of period 1,942 645
Supplemental cash flow information    
Increase (decrease) in capital expenditures not paid 10 110
Increase (decrease) in DPP 0 1,812
Constellation Energy Generation, LLC    
Cash flows from operating activities    
Net income (loss) 129 883
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities    
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization 640 694
Deferred income taxes and amortization of ITCs (98) 9
Net fair value changes related to derivatives 356 (186)
Net realized and unrealized (gains) losses on NDT funds (44) (192)
Net realized and unrealized (gains) losses on equity investments 268 (47)
Other non-cash operating activities 24 (62)
Changes in assets and liabilities:    
Accounts receivable (15) 465
Receivables from and payables to affiliates, net (259) (32)
Inventories 98 114
Accounts payable and accrued expenses (301) (380)
Option premiums received (paid), net 26 74
Collateral received (posted), net (486) 297
Income taxes 120 159
Pension and non-pension postretirement benefit contributions (174) (177)
Other assets and liabilities (257) (2,378)
Net cash flows provided by (used in) operating activities 27 (759)
Cash flows from investing activities    
Capital expenditures (806) (738)
Proceeds from NDT fund sales 2,084 1,779
Investment in NDT funds (2,152) (1,847)
Collection of DPP, net 0 1,644
Acquisitions of assets and businesses (5) (14)
Other investing activities (7) 6
Net cash flows provided by (used in) investing activities (886) 830
Cash flows from financing activities    
Change in short-term borrowings 0 165
Proceeds from short-term borrowings with maturities greater than 90 days 0 200
Repayments of short-term borrowings with maturities greater than 90 days 0 (500)
Issuance of long-term debt 0 900
Retirement of long-term debt (57) (32)
Distributions to member (272) (610)
Other financing activities (5) (10)
Net cash flows provided by (used in) financing activities (334) 113
Increase (decrease) in cash, restricted cash, and cash equivalents (1,193) 184
Cash, restricted cash, and cash equivalents at beginning of period 3,115 440
Cash, restricted cash, and cash equivalents at end of period 1,922 624
Supplemental cash flow information    
Increase (decrease) in capital expenditures not paid 10 110
Increase (decrease) in DPP $ 0 $ 1,812