Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,841	$ 2,550	$ 3,908
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	6,084	5,843	5,663
Equity component of AFUDC	(198)	(197)	(171)
Gains on sales of other assets	(52)	(22)	(13)
Impairment of assets and other charges	85	434	353
Deferred income taxes	3	(200)	191
Contributions to qualified pension plans	(100)	(58)
Payments for asset retirement obligations	(632)	(584)	(540)
Provision for rate refunds	(63)	(130)	(70)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(18)	19	50
Receivables	443	(788)	(297)
Inventory	(706)	(476)	(34)
Other current assets	(267)	(1,498)	(1,136)
Increase (decrease) in
Accounts payable	(800)	805	249
Taxes accrued	126	10	284
Other current liabilities	(26)	(153)	(13)
Other assets	914	(1,577)	125
Other liabilities	584	410	95
Net cash provided by operating activities	9,878	5,927	8,290
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(12,604)	(11,367)	(9,715)
Purchases of debt and equity securities	(3,761)	(4,243)	(6,098)
Proceeds from sales and maturities of debt and equity securities	3,824	4,333	6,103
Other	(799)	(727)	(333)
Net cash used in investing activities	(12,475)	(11,973)	(10,935)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	10,028	11,874	9,052
Payments for the redemption of long-term debt	(4,737)	(4,396)	(5,294)
Other	(124)	(130)	(94)
Net cash provided by financing activities	2,351	6,129	2,609
Net (decrease) increase in cash, cash equivalents and restricted cash	(246)	83	(36)
Cash, cash equivalents and restricted cash at beginning of period	603	520	556
Cash, cash equivalents and restricted cash at end of period	357	603	520
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,883	2,361	2,248
Cash paid for (received from) income taxes	1	(6)	(3)
Significant non-cash transactions:
Accrued capital expenditures	1,908	1,766	1,325
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	1,470	1,600	1,336
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,845	1,787	1,743
Equity component of AFUDC	(91)	(98)	(65)
Gains on sales of other assets	(26)	(4)	(2)
Impairment of assets and other charges	44	26	227
Deferred income taxes	(53)	210	(213)
Contributions to qualified pension plans	(26)	(15)
Payments for asset retirement obligations	(210)	(200)	(182)
Provision for rate refunds	(39)	(74)	(46)
(Increase) decrease in
Receivables	22	(102)	(99)
Receivables from affiliated companies	187	(200)	(66)
Inventory	(320)	(138)	(16)
Other current assets	(495)	(592)	(309)
Increase (decrease) in
Accounts payable	(447)	377	5
Accounts payable to affiliated companies	(14)	(75)	85
Taxes accrued	64	(46)	206
Other current liabilities	63	(91)	(39)
Other assets	703	(760)	23
Other liabilities	108	(36)	116
Net cash provided by operating activities	2,785	1,569	2,704
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,733)	(3,304)	(2,693)
Purchases of debt and equity securities	(2,025)	(2,633)	(3,425)
Proceeds from sales and maturities of debt and equity securities	2,025	2,633	3,425
Proceeds from the sales of other assets	30	62
Other	(288)	(243)	(177)
Net cash used in investing activities	(3,991)	(3,485)	(2,870)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	2,780	1,441	1,651
Payments for the redemption of long-term debt	(1,042)	(436)	(617)
Notes payable to affiliated companies	(565)	1,007	(280)
Distributions to parent		(50)	(600)
Other	(1)	(1)	(1)
Net cash provided by financing activities	1,172	1,961	153
Net (decrease) increase in cash, cash equivalents and restricted cash	(34)	45	(13)
Cash, cash equivalents and restricted cash at beginning of period	53	8	21
Cash, cash equivalents and restricted cash at end of period	19	53	8
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	528	546	508
Cash paid for (received from) income taxes	151	(60)	233
Significant non-cash transactions:
Accrued capital expenditures	$ 613	$ 475	$ 359