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Condensed Consolidated Statements of Cash Flows - Duke Energy Piedmont - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 3,865 $ 3,387
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 5,744 4,792
Equity component of AFUDC (236) (173)
Deferred income taxes 940 369
Equity in earnings of unconsolidated affiliates (38) (53)
Contributions to qualified pension plans 0 (100)
(Increase) decrease in    
Receivables 83 (22)
Inventory 15 (36)
Other current assets (456) 742
Increase (decrease) in    
Accounts payable (1,308) 90
Taxes accrued 295 202
Other current liabilities (224) (291)
Other assets (44) 154
Other liabilities 440 236
Net cash provided by operating activities 8,672 8,951
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (9,881) (9,191)
Other (758) (722)
Net cash used in investing activities (9,976) (9,851)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 9,432 7,760
Payments for the redemption of long-term debt (4,626) (2,833)
Other 79 (84)
Net cash provided by financing activities 1,622 990
Net increase in cash, cash equivalents and restricted cash 318 90
Cash, cash equivalents and restricted cash at beginning of period 421 357
Cash, cash equivalents and restricted cash at end of period 739 447
Significant non-cash transactions:    
Accrued capital expenditures 2,090 1,604
Piedmont    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 243 218
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 212 193
Equity component of AFUDC (13) (17)
Deferred income taxes 46 54
Equity in earnings of unconsolidated affiliates (6) (6)
Contributions to qualified pension plans 0 (3)
(Increase) decrease in    
Receivables 217 185
Receivables from affiliated companies 7 (2)
Inventory 13 54
Other current assets (49) (71)
Increase (decrease) in    
Accounts payable (44) (39)
Accounts payable to affiliated companies 20 10
Taxes accrued (27) (36)
Other current liabilities (51) 8
Other assets (7) (15)
Other liabilities (4) 8
Net cash provided by operating activities 557 541
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (595) (800)
Other (24) (44)
Net cash used in investing activities (619) (844)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 450 373
Payments for the redemption of long-term debt (150) (40)
Notes payable to affiliated companies (197) (26)
Dividends to parent (40) 0
Other (1) 0
Net cash provided by financing activities 62 307
Net increase in cash, cash equivalents and restricted cash 0 4
Cash, cash equivalents and restricted cash at beginning of period 2 0
Cash, cash equivalents and restricted cash at end of period 2 4
Significant non-cash transactions:    
Accrued capital expenditures $ 129 $ 143