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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities    
Net income (loss) $ 2,888 $ 1,616
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 2,049 1,840
Deferred income taxes and amortization of ITCs 358 189
Net fair value changes related to derivatives (1,161) 146
Net realized and unrealized (gains) losses on NDT funds (475) (154)
Net realized and unrealized (gains) losses on equity investments 115 (490)
Other non-cash operating activities (161) 147
Changes in assets and liabilities:    
Accounts receivable 1,083 942
Inventories 31 90
Accounts payable and accrued expenses (38) (1,526)
Option premiums received (paid), net 159 (36)
Collateral received (posted), net 1,495 (222)
Income taxes 154 277
Pension and non-pension postretirement benefit contributions (178) (46)
Other assets and liabilities (7,767) (4,892)
Net cash flows provided by (used in) operating activities (1,448) (2,119)
Cash flows from investing activities    
Capital expenditures (1,836) (1,735)
Proceeds from NDT fund sales 4,934 4,221
Investment in NDT funds (5,140) (4,374)
Collection of DPP, net 7,104 4,058
Acquisitions of assets and businesses (22) (21)
Other investing activities 16 30
Net cash flows provided by (used in) investing activities 5,056 2,179
Cash flows from financing activities    
Change in short-term borrowings (1,105) (959)
Proceeds from short-term borrowings with maturities greater than 90 days 200 527
Repayments of short-term borrowings with maturities greater than 90 days (739) (200)
Issuance of long-term debt 900 3,192
Retirement of long-term debt (99) (150)
Other financing activities (5) 6
Net cash flows provided by (used in) financing activities (2,180) 1,389
Increase (decrease) in cash, restricted cash, and cash equivalents 1,428 1,449
Cash, restricted cash, and cash equivalents at beginning of period 454 528
Cash, restricted cash, and cash equivalents at end of period 1,882 1,977
Supplemental cash flow information    
Increase (decrease) in capital expenditures not paid 20 (63)
Increase (decrease) in DPP 7,682 5,288
Increase (decrease) in PP&E related to ARO update (1,475) 762
Constellation Energy Generation, LLC    
Cash flows from operating activities    
Net income (loss) 2,888 1,616
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 2,049 1,840
Deferred income taxes and amortization of ITCs 358 189
Net fair value changes related to derivatives (1,161) 146
Net realized and unrealized (gains) losses on NDT funds (475) (154)
Net realized and unrealized (gains) losses on equity investments 115 (490)
Other non-cash operating activities (195) 99
Changes in assets and liabilities:    
Accounts receivable 1,085 936
Receivables from and payables to affiliates, net 238 23
Inventories 31 90
Accounts payable and accrued expenses (38) (1,546)
Option premiums received (paid), net 159 (36)
Collateral received (posted), net 1,495 (222)
Income taxes 154 277
Pension and non-pension postretirement benefit contributions (178) (46)
Other assets and liabilities (7,977) (4,953)
Net cash flows provided by (used in) operating activities (1,452) (2,231)
Cash flows from investing activities    
Capital expenditures (1,836) (1,735)
Proceeds from NDT fund sales 4,934 4,221
Investment in NDT funds (5,140) (4,374)
Collection of DPP, net 7,104 4,058
Acquisitions of assets and businesses (22) (21)
Other investing activities 16 30
Net cash flows provided by (used in) investing activities 5,056 2,179
Cash flows from financing activities    
Change in short-term borrowings (1,105) (959)
Proceeds from short-term borrowings with maturities greater than 90 days 200 527
Repayments of short-term borrowings with maturities greater than 90 days (739) (200)
Issuance of long-term debt 900 3,192
Retirement of long-term debt (99) (150)
Distributions to member (1,331) (909)
Other financing activities 0 (3)
Net cash flows provided by (used in) financing activities (2,174) 1,498
Increase (decrease) in cash, restricted cash, and cash equivalents 1,430 1,446
Cash, restricted cash, and cash equivalents at beginning of period 440 501
Cash, restricted cash, and cash equivalents at end of period 1,870 1,947
Supplemental cash flow information    
Increase (decrease) in capital expenditures not paid 20 (63)
Increase (decrease) in DPP 7,682 5,288
Increase (decrease) in PP&E related to ARO update $ (1,475) $ 762