Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,915	$ 1,232
Net income	3,162	1,440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,189	4,081
Equity in (earnings) losses of unconsolidated affiliates	(14)	2,004
Equity component of AFUDC	(126)	(112)
Impairment of assets and other charges	342	36
Deferred income taxes	206	210
Payments for asset retirement obligations	(389)	(463)
Provision for rate refunds	(41)	(15)
Refund of AMT credit carryforwards		572
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	116	87
Receivables	(167)	58
Inventory	268	43
Other current assets	(643)	199
Increase (decrease) in
Accounts payable	(146)	(563)
Taxes accrued	431	386
Other current liabilities	10	(284)
Other assets	199	(338)
Other liabilities	77	(367)
Net cash provided by operating activities	7,227	6,766
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,089)	(7,408)
Contributions to equity method investments	(30)	(276)
Purchases of debt and equity securities	(4,292)	(6,160)
Proceeds from sales and maturities of debt and equity securities	4,335	6,087
Disbursements to canceled equity method investments	(855)
Other	(269)	(207)
Net cash used in investing activities	(8,200)	(7,964)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	6,379	6,162
Proceeds from the issuance of common stock	5	75
Payments for the redemption of long-term debt	(3,696)	(3,468)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	109	2,372
Payments for the redemption of short-term debt with original maturities greater than 90 days	(997)	(1,143)
Notes payable and commercial paper	165	(969)
Contributions from noncontrolling interests	1,556	402
Dividends paid	(2,340)	(2,113)
Other	(21)	(93)
Net cash provided by financing activities	1,160	1,225
Net increase in cash, cash equivalents and restricted cash	187	27
Cash, cash equivalents and restricted cash at beginning of period	556	573
Cash, cash equivalents and restricted cash at end of period	743	600
Significant non-cash transactions:
Accrued capital expenditures	998	992
Non-cash dividends		82
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,070	1,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,295	1,295
Equity component of AFUDC	(46)	(46)
Loss on sales of other assets	(1)
Impairment of assets and other charges	238	22
Deferred income taxes	(146)	(103)
Payments for asset retirement obligations	(132)	(127)
Provision for rate refunds	(29)	(1)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(1)
Receivables	(172)	41
Receivables from affiliated companies	39	50
Inventory	41	4
Other current assets	(153)	197
Increase (decrease) in
Accounts payable	(254)	(313)
Accounts payable to affiliated companies	(15)	(55)
Taxes accrued	315	352
Other current liabilities	72	(121)
Other assets	52	(72)
Other liabilities	167	(23)
Net cash provided by operating activities	2,340	2,228
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,947)	(1,931)
Purchases of debt and equity securities	(2,465)	(1,313)
Proceeds from sales and maturities of debt and equity securities	2,465	1,313
Notes receivable from affiliated companies		(65)
Other	(122)	(105)
Net cash used in investing activities	(2,069)	(2,101)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,367	965
Payments for the redemption of long-term debt	(616)	(457)
Notes payable to affiliated companies	(421)	(29)
Distributions to parent	(600)	(600)
Other	(1)	(1)
Net cash provided by financing activities	(271)	(122)
Net increase in cash, cash equivalents and restricted cash		5
Cash, cash equivalents and restricted cash at beginning of period	21	18
Cash, cash equivalents and restricted cash at end of period	21	23
Significant non-cash transactions:
Accrued capital expenditures	308	295
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,334	1,233
Net income	1,333	1,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,707	1,734
Equity component of AFUDC	(37)	(30)
Impairment of assets and other charges	79	1
Deferred income taxes	235	(3)
Payments for asset retirement obligations	(206)	(287)
Provision for rate refunds	(22)	4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	117	(13)
Receivables	(123)	(207)
Receivables from affiliated companies	96	32
Inventory	120	46
Other current assets	(347)	214
Increase (decrease) in
Accounts payable	79	(124)
Accounts payable to affiliated companies	(68)	(102)
Taxes accrued	161	263
Other current liabilities	(36)	(41)
Other assets	(3)	(154)
Other liabilities	(139)	(102)
Net cash provided by operating activities	2,947	2,464
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,628)	(2,602)
Purchases of debt and equity securities	(1,583)	(4,554)
Proceeds from sales and maturities of debt and equity securities	1,649	4,543
Notes receivable from affiliated companies		164
Other	(131)	(114)
Net cash used in investing activities	(2,693)	(2,563)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190	1,791
Payments for the redemption of long-term debt	(977)	(1,555)
Notes payable to affiliated companies	154	338
Dividends to parent	(700)	(400)
Other	(2)	(13)
Net cash provided by financing activities	(335)	161
Net increase in cash, cash equivalents and restricted cash	(81)	62
Cash, cash equivalents and restricted cash at beginning of period	200	126
Cash, cash equivalents and restricted cash at end of period	119	188
Significant non-cash transactions:
Accrued capital expenditures	290	311
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	800	711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	951	972
Equity component of AFUDC	(25)	(22)
Impairment of assets and other charges	60	5
Deferred income taxes	22	(33)
Payments for asset retirement obligations	(129)	(249)
Provision for rate refunds	(22)	4
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	108
Receivables	(66)	(34)
Receivables from affiliated companies	(18)	7
Inventory	95	24
Other current assets	(79)	82
Increase (decrease) in
Accounts payable	20	(185)
Accounts payable to affiliated companies	(102)	(59)
Taxes accrued	75	190
Other current liabilities	(36)	(24)
Other assets	48	(185)
Other liabilities	(32)	21
Net cash provided by operating activities	1,670	1,225
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,313)	(1,142)
Purchases of debt and equity securities	(1,306)	(1,269)
Proceeds from sales and maturities of debt and equity securities	1,291	1,238
Other	(36)	(31)
Net cash used in investing activities	(1,364)	(1,204)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,190	1,296
Payments for the redemption of long-term debt	(605)	(985)
Notes payable to affiliated companies	(178)	101
Distributions to parent	(700)	(400)
Other	(1)	(12)
Net cash provided by financing activities	(294)
Net increase in cash, cash equivalents and restricted cash	12	21
Cash, cash equivalents and restricted cash at beginning of period	39	22
Cash, cash equivalents and restricted cash at end of period	51	43
Significant non-cash transactions:
Accrued capital expenditures	82	124
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	631	623
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	752	755
Equity component of AFUDC	(12)	(8)
Impairment of assets and other charges	19	(4)
Deferred income taxes	207	19
Payments for asset retirement obligations	(77)	(38)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	7	(17)
Receivables	(57)	(172)
Receivables from affiliated companies		(3)
Inventory	25	22
Other current assets	(247)	41
Increase (decrease) in
Accounts payable	59	63
Accounts payable to affiliated companies	44	(54)
Taxes accrued	95	217
Other current liabilities	(5)	(20)
Other assets	(46)	48
Other liabilities	(94)	(136)
Net cash provided by operating activities	1,301	1,336
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,316)	(1,460)
Purchases of debt and equity securities	(277)	(3,284)
Proceeds from sales and maturities of debt and equity securities	358	3,305
Notes receivable from affiliated companies		173
Other	(95)	(82)
Net cash used in investing activities	(1,330)	(1,348)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		495
Payments for the redemption of long-term debt	(372)	(570)
Notes payable to affiliated companies	408	66
Net cash provided by financing activities	36	(9)
Net increase in cash, cash equivalents and restricted cash	7	(21)
Cash, cash equivalents and restricted cash at beginning of period	50	56
Cash, cash equivalents and restricted cash at end of period	57	35
Significant non-cash transactions:
Accrued capital expenditures	208	187
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	188	201
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	231	211
Equity component of AFUDC	(5)	(4)
Impairment of assets and other charges	5
Deferred income taxes	27	31
Payments for asset retirement obligations	(1)	(1)
Provision for rate refunds	12	10
(Increase) decrease in
Receivables	(9)	(5)
Receivables from affiliated companies	(11)	35
Inventory	(4)	5
Other current assets	(34)	5
Increase (decrease) in
Accounts payable	27	(28)
Accounts payable to affiliated companies	(9)	(14)
Taxes accrued	(37)	(23)
Other current liabilities	(12)	6
Other assets	(35)	(24)
Other liabilities	8	(7)
Net cash provided by operating activities	341	398
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(615)	(611)
Notes receivable from affiliated companies	36
Other	(42)	(34)
Net cash used in investing activities	(621)	(645)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		467
Notes payable to affiliated companies	282	(227)
Net cash provided by financing activities	282	240
Net increase in cash, cash equivalents and restricted cash	2	(7)
Cash, cash equivalents and restricted cash at beginning of period	14	17
Cash, cash equivalents and restricted cash at end of period	16	10
Significant non-cash transactions:
Accrued capital expenditures	103	92
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	396	299
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	460	416
Equity component of AFUDC	(19)	(18)
Impairment of assets and other charges	8
Deferred income taxes	19	11
Payments for asset retirement obligations	(49)	(48)
(Increase) decrease in
Receivables	(7)	15
Receivables from affiliated companies	17	(5)
Inventory	106	10
Other current assets	(58)	12
Increase (decrease) in
Accounts payable	46	(1)
Accounts payable to affiliated companies	(15)	(22)
Taxes accrued	25	65
Other current liabilities	23	(2)
Other assets	11	(41)
Other liabilities	3	104
Net cash provided by operating activities	966	795
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(584)	(669)
Purchases of debt and equity securities	(34)	(24)
Proceeds from sales and maturities of debt and equity securities	16	15
Notes receivable from affiliated companies	(218)
Other	(8)	(24)
Net cash used in investing activities	(828)	(702)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt		544
Payments for the redemption of long-term debt		(500)
Notes payable to affiliated companies	(131)	53
Distributions to parent		(200)
Net cash provided by financing activities	(131)	(103)
Net increase in cash, cash equivalents and restricted cash	7	(10)
Cash, cash equivalents and restricted cash at beginning of period	7	25
Cash, cash equivalents and restricted cash at end of period	14	15
Significant non-cash transactions:
Accrued capital expenditures	105	73
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	175	155
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	152	135
Equity in (earnings) losses of unconsolidated affiliates	(7)	(7)
Equity component of AFUDC	(19)	(14)
Impairment of assets and other charges	10	7
Deferred income taxes	10	24
Provision for rate refunds	(3)	(27)
(Increase) decrease in
Receivables	151	164
Receivables from affiliated companies	(1)	(1)
Inventory		25
Other current assets	7	(59)
Increase (decrease) in
Accounts payable	(55)	(53)
Accounts payable to affiliated companies	(48)	60
Taxes accrued	17	16
Other current liabilities	(32)	(4)
Other assets	3	(14)
Other liabilities	2	7
Net cash provided by operating activities	362	414
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(628)	(641)
Contributions to equity method investments	(9)
Return of investment capital	1
Other	(23)	(18)
Net cash used in investing activities	(659)	(659)
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	(215)	(149)
Capital contributions from parent	325
Net cash provided by financing activities	297	245
Significant non-cash transactions:
Accrued capital expenditures	$ 115	$ 123