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Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (loss) $ 4,614 $ 2,874 $ 2,455
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization and accretion (including amortization of nuclear fuel) 6,419 6,084 5,843
Equity component of AFUDC (233) (198) (197)
Gains on sales of other assets (26) (52) (22)
Impairment of assets and other charges 38 85 434
Deferred income taxes 987 3 (200)
Contributions to qualified pension plans (100) (100) (58)
Payments for asset retirement obligations (545) (632) (584)
Provision for rate refunds (27) (63) (130)
(Increase) decrease in      
Net realized and unrealized mark-to-market and hedging transactions (103) (18) 19
Receivables (23) 443 (788)
Inventory (212) (706) (476)
Other current assets 885 (267) (1,498)
Increase (decrease) in      
Accounts payable 1,329 (800) 805
Taxes accrued 32 126 10
Other current liabilities (11) (26) (153)
Other assets (1,170) 914 (1,577)
Other liabilities 451 584 410
Net cash provided by operating activities 12,328 9,878 5,927
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (12,280) (12,604) (11,367)
Purchases of debt and equity securities (5,703) (3,761) (4,243)
Proceeds from sales and maturities of debt and equity securities 5,803 3,824 4,333
Other (1,009) (799) (727)
Net cash used in investing activities (13,123) (12,475) (11,973)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from the issuance of long-term debt 8,956 10,028 11,874
Payments for the redemption of long-term debt (3,357) (4,737) (4,396)
Other (52) (124) (130)
Net cash provided by financing activities 859 2,351 6,129
Net increase (decrease) in cash, cash equivalents and restricted cash 64 (246) 83
Cash, cash equivalents and restricted cash at beginning of period 357 603 520
Cash, cash equivalents and restricted cash at end of period 421 357 603
Supplemental Disclosures:      
Cash paid for interest, net of amount capitalized 3,284 2,883 2,361
Cash paid for (received from) income taxes, net (includes transferable tax credit sale proceeds of $558, $28 and $0, respectively) (400) 1 (6)
Significant non-cash transactions:      
Accrued capital expenditures 1,909 1,908 1,766
Duke Energy Carolinas      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (loss) 1,883 1,470 1,600
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization and accretion (including amortization of nuclear fuel) 2,033 1,845 1,787
Equity component of AFUDC (113) (91) (98)
Gains on sales of other assets (2) (26) (4)
Impairment of assets and other charges 31 44 26
Deferred income taxes (28) (53) 210
Contributions to qualified pension plans (26) (26) (15)
Payments for asset retirement obligations (180) (210) (200)
Provision for rate refunds (8) (39) (74)
(Increase) decrease in      
Receivables (49) 22 (102)
Receivables from affiliated companies 46 187 (200)
Inventory (60) (320) (138)
Other current assets 928 (495) (592)
Increase (decrease) in      
Accounts payable 476 (447) 377
Accounts payable to affiliated companies 46 (14) (75)
Taxes accrued 346 64 (46)
Other current liabilities (68) 63 (91)
Other assets (556) 703 (760)
Other liabilities (162) 108 (36)
Net cash provided by operating activities 4,537 2,785 1,569
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (3,966) (3,733) (3,304)
Purchases of debt and equity securities (2,775) (2,025) (2,633)
Proceeds from sales and maturities of debt and equity securities 2,775 2,025 2,633
Proceeds from the sales of other assets   30 62
Notes receivable from affiliated companies (65)    
Other (358) (288) (243)
Net cash used in investing activities (4,389) (3,991) (3,485)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from the issuance of long-term debt 1,487 2,780 1,441
Payments for the redemption of long-term debt (19) (1,042) (436)
Notes payable to affiliated companies (668) (565) 1,007
Distributions to parent (950) 0 (50)
Other (1) (1) (1)
Net cash provided by financing activities (151) 1,172 1,961
Net increase (decrease) in cash, cash equivalents and restricted cash (3) (34) 45
Cash, cash equivalents and restricted cash at beginning of period 19 53 8
Cash, cash equivalents and restricted cash at end of period 16 19 53
Supplemental Disclosures:      
Cash paid for interest, net of amount capitalized 683 528 546
Cash paid for (received from) income taxes, net (includes transferable tax credit sale proceeds of $558, $28 and $0, respectively) (85) 151 (60)
Significant non-cash transactions:      
Accrued capital expenditures $ 802 $ 613 $ 475