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Condensed Consolidated Statements of Cash Flows - Duke Energy Piedmont - 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)
Provision for rate refunds (27) (63) (130)
(Increase) decrease in      
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)
Contributions to equity method investments (8) (34) (58)
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
Piedmont      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (loss) 413 379 323
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization and accretion (including amortization of nuclear fuel) 264 239 225
Equity component of AFUDC (21) (21) (11)
Impairment of assets and other charges 0 (4) 18
Deferred income taxes 60 38 5
Equity in earnings of unconsolidated affiliates (8) (9) (8)
Contributions to qualified pension plans (3) (3) (2)
Provision for rate refunds 0 0 (3)
(Increase) decrease in      
Receivables (61) 127 (111)
Receivables from affiliated companies (6) 1 0
Inventory 34 58 (63)
Other current assets (9) (46) 32
Increase (decrease) in      
Accounts payable 40 (45) 40
Accounts payable to affiliated companies (28) 3 11
Taxes accrued (5) 15 11
Other current liabilities (13) 27 36
Other assets (16) (7) 5
Other liabilities 17 10 (1)
Net cash provided by operating activities 658 762 507
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (1,025) (1,036) (862)
Contributions to equity method investments 0 0 (8)
Other (54) (54) (26)
Net cash used in investing activities (1,079) (1,090) (896)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from the issuance of long-term debt 373 348 394
Payments for the redemption of long-term debt (40) (45) 0
Notes payable to affiliated companies 200 25 (4)
Distributions to parent (110) 0 0
Other 0 0 (1)
Net cash provided by financing activities 423 328 389
Net increase (decrease) in cash, cash equivalents and restricted cash 2 0 0
Cash, cash equivalents and restricted cash at beginning of period 0 0 0
Cash, cash equivalents and restricted cash at end of period 2 0 0
Supplemental Disclosures:      
Cash paid for interest, net of amount capitalized 176 162 135
Cash paid for (received from) income taxes, net (includes transferable tax credit sale proceeds of $558, $28 and $0, respectively) 48 28 23
Significant non-cash transactions:      
Accrued capital expenditures $ 105 $ 223 $ 207