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Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (loss) $ 5,071 $ 4,614 $ 2,874
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization and accretion (including amortization of nuclear fuel) 7,704 6,419 6,084
Equity component of AFUDC (328) (233) (198)
Gains on sales of other assets (45) (26) (52)
Impairment of assets and other charges (4) 38 85
Deferred income taxes 1,204 987 3
Contributions to qualified pension plans (100) (100) (100)
Payments for asset retirement obligations (509) (545) (632)
(Increase) decrease in      
Net realized and unrealized mark-to-market and hedging transactions 0 (103) (18)
Receivables (187) (23) 443
Inventory (63) (212) (706)
Other current assets 6 885 (267)
Increase (decrease) in      
Accounts payable (821) 1,329 (800)
Taxes accrued 127 32 126
Other current liabilities 52 (55) (80)
Other assets (265) (1,170) 914
Other liabilities 535 468 575
Net cash provided by operating activities 12,330 12,328 9,878
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (14,024) (12,280) (12,604)
Purchases of debt and equity securities (8,888) (5,703) (3,761)
Proceeds from sales and maturities of debt and equity securities 9,005 5,803 3,824
Other (1,079) (1,009) (799)
Net cash used in investing activities (14,338) (13,123) (12,475)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from the issuance of long-term debt 11,891 8,956 10,028
Payments for the redemption of long-term debt (5,652) (3,357) (4,737)
Other 114 (52) (124)
Net cash provided by financing activities 1,950 859 2,351
Net (decrease) increase in cash, cash equivalents and restricted cash (58) 64 (246)
Cash, cash equivalents and restricted cash at beginning of period 421 357 603
Cash, cash equivalents and restricted cash at end of period 363 421 357
Supplemental Disclosures:      
Cash paid for interest, net of amount capitalized 3,590 3,284 2,883
Cash paid for (received from) income taxes, net (includes transferable tax credit sale proceeds) (625) (400) 1
Significant non-cash transactions:      
Accrued capital expenditures 2,674 1,909 1,908
Duke Energy Carolinas      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (loss) 2,108 1,883 1,470
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization and accretion (including amortization of nuclear fuel) 2,169 2,033 1,845
Equity component of AFUDC (144) (113) (91)
Gains on sales of other assets (6) (2) (26)
Impairment of assets and other charges (11) 31 44
Deferred income taxes 442 (28) (53)
Contributions to qualified pension plans (27) (26) (26)
Payments for asset retirement obligations (197) (180) (210)
(Increase) decrease in      
Receivables (26) (49) 22
Receivables from affiliated companies (174) 46 187
Inventory 2 (60) (320)
Other current assets (87) 928 (495)
Increase (decrease) in      
Accounts payable (261) 476 (447)
Accounts payable to affiliated companies 145 46 (14)
Taxes accrued (321) 346 64
Other current liabilities 94 (74) 32
Other assets (135) (556) 703
Other liabilities 50 (164) 100
Net cash provided by operating activities 3,621 4,537 2,785
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (4,477) (3,966) (3,733)
Purchases of debt and equity securities (4,734) (2,775) (2,025)
Proceeds from sales and maturities of debt and equity securities 4,734 2,775 2,025
Proceeds from the sales of other assets     30
Notes receivable from affiliated companies (4) (65)  
Other (388) (358) (288)
Net cash used in investing activities (4,869) (4,389) (3,991)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from the issuance of long-term debt 2,495 1,487 2,780
Payments for the redemption of long-term debt (1,224) (19) (1,042)
Notes payable to affiliated companies 0 (668) (565)
Distributions to parent (200) (950)  
Other 183 (1) (1)
Net cash provided by financing activities 1,254 (151) 1,172
Net (decrease) increase in cash, cash equivalents and restricted cash 6 (3) (34)
Cash, cash equivalents and restricted cash at beginning of period 16 19 53
Cash, cash equivalents and restricted cash at end of period 22 16 19
Supplemental Disclosures:      
Cash paid for interest, net of amount capitalized 758 683 528
Cash paid for (received from) income taxes, net (includes transferable tax credit sale proceeds) 85 (85) 151
Significant non-cash transactions:      
Accrued capital expenditures $ 997 $ 802 $ 613