Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,639	$ (2)
Net income	1,757	136
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,753	2,651
Equity in losses of unconsolidated affiliates	8	1,924
Equity component of AFUDC	(83)	(76)
Impairment of assets and other charges	131	8
Deferred income taxes	119	105
Payments for asset retirement obligations	(263)	(287)
Provision for rate refunds	(13)	(12)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	15	(24)
Receivables	85	281
Inventory	153	(56)
Other current assets	(297)	(124)
Increase (decrease) in
Accounts payable	(297)	(638)
Taxes accrued	219	273
Other current liabilities	(326)	(344)
Other assets	77	(201)
Other liabilities	(47)	(121)
Net cash provided by operating activities	3,873	3,357
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(4,636)	(5,103)
Contributions to equity method investments	(21)	(164)
Purchases of debt and equity securities	(3,182)	(3,818)
Proceeds from sales and maturities of debt and equity securities	3,217	3,755
Disbursements to canceled equity method investments	(855)
Other	(137)	(141)
Net cash used in investing activities	(5,614)	(5,471)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	4,627	3,788
Proceeds from the issuance of common stock	5	57
Payments for the redemption of long-term debt	(2,002)	(1,951)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	75	1,866
Payments for the redemption of short-term debt with original maturities greater than 90 days	(959)	(113)
Notes payable and commercial paper	1,299	(129)
Contributions from noncontrolling interests	318	163
Dividends paid	(1,541)	(1,391)
Other	(72)	(108)
Net cash provided by financing activities	1,750	2,182
Net increase in cash, cash equivalents and restricted cash	9	68
Cash, cash equivalents and restricted cash at beginning of period	556	573
Cash, cash equivalents and restricted cash at end of period	565	641
Significant non-cash transactions:
Accrued capital expenditures	990	945
Non-cash dividends		54
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	537	573
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	861	854
Equity component of AFUDC	(30)	(29)
Impairment of assets and other charges	75	2
Deferred income taxes	(41)	31
Payments for asset retirement obligations	(93)	(86)
Provision for rate refunds	(11)	2
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	4
Receivables		40
Receivables from affiliated companies	13	36
Inventory	(3)	(84)
Other current assets	(45)	170
Increase (decrease) in
Accounts payable	(266)	(249)
Accounts payable to affiliated companies	(4)	(63)
Taxes accrued	127	120
Other current liabilities	(152)	(134)
Other assets	8	(83)
Other liabilities	18	(35)
Net cash provided by operating activities	998	1,065
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,251)	(1,271)
Purchases of debt and equity securities	(1,847)	(1,017)
Proceeds from sales and maturities of debt and equity securities	1,847	1,017
Other	(80)	(73)
Net cash used in investing activities	(1,331)	(1,344)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,298	938
Payments for the redemption of long-term debt	(614)	(454)
Notes payable to affiliated companies	(35)	102
Distributions to parent	(300)	(300)
Other	(1)	(1)
Net cash provided by financing activities	348	285
Net increase in cash, cash equivalents and restricted cash	15	6
Cash, cash equivalents and restricted cash at beginning of period	21	18
Cash, cash equivalents and restricted cash at end of period	36	24
Significant non-cash transactions:
Accrued capital expenditures	315	256
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	701	627
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,104	1,118
Equity component of AFUDC	(23)	(24)
Impairment of assets and other charges	37
Deferred income taxes	163	94
Payments for asset retirement obligations	(139)	(173)
Provision for rate refunds	(7)	2
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	16	(22)
Receivables	(12)	(15)
Receivables from affiliated companies	88	34
Inventory	76	(42)
Other current assets	(247)	102
Increase (decrease) in
Accounts payable	44	(238)
Accounts payable to affiliated companies	42	(88)
Taxes accrued	97	155
Other current liabilities	(79)	(64)
Other assets	(33)	(57)
Other liabilities	(156)	(97)
Net cash provided by operating activities	1,672	1,312
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,745)	(1,812)
Purchases of debt and equity securities	(1,160)	(2,602)
Proceeds from sales and maturities of debt and equity securities	1,201	2,588
Notes receivable from affiliated companies		164
Other	(69)	(81)
Net cash used in investing activities	(1,773)	(1,743)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	19	514
Payments for the redemption of long-term debt	(41)	(550)
Notes payable to affiliated companies	34	552
Other	(3)
Net cash provided by financing activities	9	516
Net increase in cash, cash equivalents and restricted cash	(92)	85
Cash, cash equivalents and restricted cash at beginning of period	200	126
Cash, cash equivalents and restricted cash at end of period	108	211
Significant non-cash transactions:
Accrued capital expenditures	329	287
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	425	365
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	610	635
Equity component of AFUDC	(15)	(19)
Impairment of assets and other charges	18
Deferred income taxes	28	60
Payments for asset retirement obligations	(88)	(164)
Provision for rate refunds	(7)	2
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	9	(5)
Receivables	31	96
Receivables from affiliated companies	(13)	10
Inventory	52	(46)
Other current assets	(52)	87
Increase (decrease) in
Accounts payable	28	(260)
Accounts payable to affiliated companies	(1)	(50)
Taxes accrued	2	71
Other current liabilities	(45)	(16)
Other assets	(40)	(92)
Other liabilities	(43)	(5)
Net cash provided by operating activities	899	669
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(869)	(795)
Purchases of debt and equity securities	(926)	(569)
Proceeds from sales and maturities of debt and equity securities	915	548
Other	(2)	(21)
Net cash used in investing activities	(882)	(837)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	19	20
Payments for the redemption of long-term debt	(3)	(13)
Notes payable to affiliated companies	(25)	191
Other	(1)	(1)
Net cash provided by financing activities	(10)	197
Net increase in cash, cash equivalents and restricted cash	7	29
Cash, cash equivalents and restricted cash at beginning of period	39	22
Cash, cash equivalents and restricted cash at end of period	46	51
Significant non-cash transactions:
Accrued capital expenditures	97	95
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	334	336
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	491	478
Equity component of AFUDC	(8)	(6)
Impairment of assets and other charges	19
Deferred income taxes	130	37
Payments for asset retirement obligations	(52)	(9)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	5	(20)
Receivables	(42)	(110)
Receivables from affiliated companies	(5)	(2)
Inventory	24	4
Other current assets	(132)	(11)
Increase (decrease) in
Accounts payable	15	23
Accounts payable to affiliated companies	44	(51)
Taxes accrued	62	134
Other current liabilities	(35)	(50)
Other assets	11	37
Other liabilities	(94)	(91)
Net cash provided by operating activities	767	699
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(876)	(1,016)
Purchases of debt and equity securities	(234)	(2,033)
Proceeds from sales and maturities of debt and equity securities	286	2,040
Notes receivable from affiliated companies		173
Other	(67)	(60)
Net cash used in investing activities	(891)	(896)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		495
Payments for the redemption of long-term debt	(38)	(537)
Notes payable to affiliated companies	167	232
Other		2
Net cash provided by financing activities	129	192
Net increase in cash, cash equivalents and restricted cash	5	(5)
Cash, cash equivalents and restricted cash at beginning of period	50	56
Cash, cash equivalents and restricted cash at end of period	55	51
Significant non-cash transactions:
Accrued capital expenditures	232	192
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	130	131
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	151	138
Equity component of AFUDC	(4)	(2)
Impairment of assets and other charges	5
Deferred income taxes	17	24
Payments for asset retirement obligations	(1)
Provision for rate refunds	8	6
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)
Receivables	2	2
Receivables from affiliated companies	(11)	45
Inventory	(1)	6
Other current assets	(12)	8
Increase (decrease) in
Accounts payable	(8)	(22)
Accounts payable to affiliated companies	4	(10)
Taxes accrued	(58)	(9)
Other current liabilities	(7)	2
Other assets	(33)	(24)
Other liabilities	4	(3)
Net cash provided by operating activities	185	292
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(415)	(403)
Notes receivable from affiliated companies	30	(35)
Other	(23)	(27)
Net cash used in investing activities	(408)	(465)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		397
Payments for the redemption of long-term debt		(233)
Notes payable to affiliated companies	221
Net cash provided by financing activities	221	164
Net increase in cash, cash equivalents and restricted cash	(2)	(9)
Cash, cash equivalents and restricted cash at beginning of period	14	17
Cash, cash equivalents and restricted cash at end of period	12	8
Significant non-cash transactions:
Accrued capital expenditures	88	94
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	215	180
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	306	267
Equity component of AFUDC	(12)	(12)
Impairment of assets and other charges	8
Deferred income taxes	1	38
Payments for asset retirement obligations	(30)	(28)
(Increase) decrease in
Receivables	(15)	19
Receivables from affiliated companies	(8)	20
Inventory	61	28
Other current assets	(31)	13
Increase (decrease) in
Accounts payable	35	22
Accounts payable to affiliated companies	(29)	(13)
Taxes accrued	10	4
Other current liabilities	20	(22)
Other assets	(3)	(29)
Other liabilities	6	(6)
Net cash provided by operating activities	534	481
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(394)	(456)
Purchases of debt and equity securities	(9)	(14)
Proceeds from sales and maturities of debt and equity securities	6	7
Notes receivable from affiliated companies	7	(425)
Other	(8)	(16)
Net cash used in investing activities	(398)	(904)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		544
Notes payable to affiliated companies	(131)	(30)
Distributions to parent		(100)
Net cash provided by financing activities	(131)	414
Net increase in cash, cash equivalents and restricted cash	5	(9)
Cash, cash equivalents and restricted cash at beginning of period	7	25
Cash, cash equivalents and restricted cash at end of period	12	16
Significant non-cash transactions:
Accrued capital expenditures	85	83
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	199	180
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	101	89
Equity in losses of unconsolidated affiliates	(4)	(4)
Equity component of AFUDC	(14)	(9)
Impairment of assets and other charges	5
Deferred income taxes	3	17
Provision for rate refunds	(3)	(24)
(Increase) decrease in
Receivables	137	154
Receivables from affiliated companies		(4)
Inventory	26	42
Other current assets	30	(69)
Increase (decrease) in
Accounts payable	(70)	(68)
Accounts payable to affiliated companies	(35)	33
Taxes accrued	3	5
Other current liabilities	(30)	(4)
Other assets	6	(13)
Other liabilities	(2)	7
Net cash provided by operating activities	352	332
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(411)	(438)
Return of investment capital	1	1
Other	(17)	(12)
Net cash used in investing activities	(427)	(449)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	347	394
Payments for the redemption of long-term debt	(160)
Notes payable to affiliated companies	(437)	(277)
Capital contributions from parent	325
Net cash provided by financing activities	75	117
Significant non-cash transactions:
Accrued capital expenditures	$ 111	$ 98