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Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 2,072 $ 557
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 3,100 2,916
Equity component of AFUDC (116) (97)
Gains on sales of other assets (18) (38)
Impairment of assets and other charges 44 8
Deferred income taxes 264 (52)
Payments for asset retirement obligations (262) (261)
Provision for rate refunds (7) (57)
(Increase) decrease in    
Receivables (19) 586
Inventory (86) (517)
Other current assets 502 (41)
Increase (decrease) in    
Accounts payable (215) (1,245)
Taxes accrued (68) (8)
Other current liabilities (252) (154)
Other assets 331 608
Other liabilities 227 82
Net cash provided by operating activities 5,427 3,785
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (6,204) (6,265)
Purchases of debt and equity securities (2,275) (1,594)
Proceeds from sales and maturities of debt and equity securities 2,319 1,628
Net proceeds from the sales of other assets 1 111
Other (408) (366)
Net cash used in investing activities (6,575) (6,508)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 6,372 7,094
Payments for the redemption of long-term debt (2,731) (2,372)
Other (108) (95)
Net cash provided by financing activities 1,274 2,687
Net increase (decrease) in cash, cash equivalents and restricted cash 126 (36)
Cash, cash equivalents and restricted cash at beginning of period 357 603
Cash, cash equivalents and restricted cash at end of period 483 567
Significant non-cash transactions:    
Accrued capital expenditures 1,721 1,398
Duke Energy Carolinas    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 821 542
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 966 906
Equity component of AFUDC (58) (48)
Gains on sales of other assets (1) (26)
Impairment of assets and other charges 34 6
Deferred income taxes (38) (5)
Payments for asset retirement obligations (80) (87)
Provision for rate refunds (6) (33)
(Increase) decrease in    
Receivables (61) 91
Receivables from affiliated companies 11 234
Inventory (25) (239)
Other current assets 9 (482)
Increase (decrease) in    
Accounts payable (28) (652)
Accounts payable to affiliated companies 3 (70)
Taxes accrued 3 48
Other current liabilities (140) 6
Other assets 410 542
Other liabilities (40) 97
Net cash provided by operating activities 1,780 830
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (1,949) (1,795)
Purchases of debt and equity securities (1,211) (936)
Proceeds from sales and maturities of debt and equity securities 1,211 936
Net proceeds from the sales of other assets 0 30
Other (178) (129)
Net cash used in investing activities (2,127) (1,894)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from the issuance of long-term debt 1,018 2,729
Payments for the redemption of long-term debt (9) (1,033)
Notes payable to affiliated companies (660) (655)
Other (1) (1)
Net cash provided by financing activities 348 1,040
Net increase (decrease) in cash, cash equivalents and restricted cash 1 (24)
Cash, cash equivalents and restricted cash at beginning of period 19 53
Cash, cash equivalents and restricted cash at end of period 20 29
Significant non-cash transactions:    
Accrued capital expenditures $ 597 $ 456