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Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 3,387 $ 1,878
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 4,792 4,538
Equity component of AFUDC (173) (146)
Gains on sales of other assets (25) (46)
Impairment of assets and other charges 39 96
Deferred income taxes 369 (29)
Contributions to qualified pension plans (100) (100)
Payments for asset retirement obligations (417) (423)
Provision for rate refunds (28) (59)
(Increase) decrease in    
Receivables (22) 481
Inventory (36) (531)
Other current assets 742 40
Increase (decrease) in    
Accounts payable 90 (972)
Taxes accrued 202 277
Other current liabilities (248) (116)
Other assets 154 491
Other liabilities 221 368
Net cash provided by operating activities 8,951 7,309
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (9,191) (9,310)
Purchases of debt and equity securities (3,380) (2,811)
Proceeds from sales and maturities of debt and equity securities 3,450 2,848
Net proceeds from the sales of other assets 1 130
Other (723) (578)
Net cash used in investing activities (9,851) (9,751)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 7,760 8,704
Payments for the redemption of long-term debt (2,833) (3,097)
Other (84) (95)
Net cash provided by financing activities 990 2,413
Net increase (decrease) in cash, cash equivalents and restricted cash 90 (29)
Cash, cash equivalents and restricted cash at beginning of period 357 603
Cash, cash equivalents and restricted cash at end of period 447 574
Significant non-cash transactions:    
Accrued capital expenditures 1,604 1,528
Duke Energy Carolinas    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 1,405 1,121
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 1,504 1,380
Equity component of AFUDC (85) (69)
Gains on sales of other assets 0 (26)
Impairment of assets and other charges 32 70
Deferred income taxes (105) (7)
Contributions to qualified pension plans (26) (26)
Payments for asset retirement obligations (131) (145)
Provision for rate refunds (7) (35)
(Increase) decrease in    
Receivables (136) (4)
Receivables from affiliated companies 1 225
Inventory 2 (257)
Other current assets (3) (439)
Increase (decrease) in    
Accounts payable 149 (523)
Accounts payable to affiliated companies 35 12
Taxes accrued 105 121
Other current liabilities (226) (48)
Other assets 652 526
Other liabilities (121) 105
Net cash provided by operating activities 3,045 1,981
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (2,923) (2,646)
Purchases of debt and equity securities (1,712) (1,594)
Proceeds from sales and maturities of debt and equity securities 1,712 1,594
Net proceeds from the sales of other assets 0 30
Notes receivable from affiliated companies (177) 0
Other (289) (215)
Net cash used in investing activities (3,389) (2,831)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 1,031 2,764
Payments for the redemption of long-term debt (17) (1,040)
Notes payable to affiliated companies (668) (902)
Other (1) (1)
Net cash provided by financing activities 345 821
Net increase (decrease) in cash, cash equivalents and restricted cash 1 (29)
Cash, cash equivalents and restricted cash at beginning of period 19 53
Cash, cash equivalents and restricted cash at end of period 20 24
Significant non-cash transactions:    
Accrued capital expenditures $ 611 $ 534