Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,579	$ 1,082	$ 3,571
Net (loss) income attributable to Duke Energy	3,908	1,377	3,748
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	5,663	5,486	5,176
Equity in (earnings) losses of unconsolidated affiliates	(28)	2,005	(162)
Equity component of AFUDC	(171)	(154)	(139)
Impairment of assets and other charges	356	984	(8)
Deferred income taxes	191	54	806
Payments for asset retirement obligations	(540)	(610)	(746)
Provision for rate refunds	(70)	(22)	60
Refund of AMT credit carryforwards		572	573
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	50	63	(48)
Receivables	(297)	(56)	78
Inventory	(34)	66	(122)
Other current assets	(1,136)	205	10
Increase (decrease) in
Accounts payable	249	(21)	(164)
Taxes accrued	284	117	(224)
Other current liabilities	(13)	(65)	172
Other assets	112	(408)	(555)
Other liabilities	95	(442)	(69)
Net cash provided by (used in) operating activities	8,290	8,856	8,209
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(9,715)	(9,907)	(11,122)
Contributions to equity method investments	(81)	(370)	(324)
Return of investment capital	44	133	11
Purchases of debt and equity securities	(6,098)	(8,011)	(3,348)
Proceeds from sales and maturities of debt and equity securities	6,103	7,949	3,343
Disbursements to canceled equity method investments	(855)
Other	(333)	(398)	(517)
Net cash used in investing activities	(10,935)	(10,604)	(11,957)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	9,052	6,330	7,091
Net proceeds from Issuance of Preferred Stock and Preference Stock			1,962
Proceeds from the issuance of common stock	5	2,745	384
Payments for the redemption of long-term debt	(5,294)	(4,506)	(3,476)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	332	3,009	397
Payments for the redemption of short-term debt with original maturities greater than 90 days	(997)	(2,147)	(479)
Notes payable and commercial paper	1,144	(1,181)	(298)
Contributions from noncontrolling interests	1,575	426	843
Dividends paid	(3,114)	(2,812)	(2,668)
Other	(94)	(133)	(26)
Net cash provided by financing activities	2,609	1,731	3,730
Net decrease in cash, cash equivalents and restricted cash	(36)	(17)	(18)
Cash, cash equivalents and restricted cash at beginning of period	556	573	591
Cash, cash equivalents and restricted cash at end of period	520	556	573
Cash, cash equivalents and restricted cash at beginning of period	259
Cash, cash equivalents and restricted cash at end of period	343	259
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,248	2,186	2,195
Cash received from income taxes	(3)	(585)	(651)
Significant non-cash transactions:
Accrued capital expenditures	1,325	1,116	1,356
Non-cash dividends		110	108
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	1,336	956	1,403
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,743	1,731	1,671
Equity component of AFUDC	(65)	(62)	(42)
Impairment of assets and other charges	227	476	17
Deferred income taxes	(213)	(260)	133
Payments for asset retirement obligations	(182)	(162)	(278)
Provision for rate refunds	(46)	(5)	36
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(4)	(8)
Receivables	(99)	52	(21)
Receivables from affiliated companies	(66)	(10)	68
Inventory	(16)	(14)	(48)
Other current assets	(309)	209	(73)
Increase (decrease) in
Accounts payable	5	55	(50)
Accounts payable to affiliated companies	85	(11)	(20)
Taxes accrued	206	30	(127)
Other current liabilities	(39)	(56)	127
Other assets	21	(102)	(42)
Other liabilities	116	(47)	(37)
Net cash provided by (used in) operating activities	2,704	2,776	2,709
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,693)	(2,669)	(2,714)
Purchases of debt and equity securities	(3,425)	(1,602)	(1,658)
Proceeds from sales and maturities of debt and equity securities	3,425	1,602	1,658
Other	(177)	(164)	(204)
Net cash used in investing activities	(2,870)	(2,833)	(2,918)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,651	998	886
Payments for the redemption of long-term debt	(617)	(813)	(6)
Notes payable to affiliated companies	(280)	477	(410)
Distributions to parent	(600)	(600)	(275)
Other	(1)	(2)	(1)
Net cash provided by financing activities	153	60	194
Net decrease in cash, cash equivalents and restricted cash	(13)	3	(15)
Cash, cash equivalents and restricted cash at beginning of period	21	18	33
Cash, cash equivalents and restricted cash at end of period	8	21	18
Cash, cash equivalents and restricted cash at beginning of period	21
Cash, cash equivalents and restricted cash at end of period	7	21
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	508	481	433
Cash received from income taxes	233	321	122
Significant non-cash transactions:
Accrued capital expenditures	359	365	347
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,599	1,046	1,327
Net (loss) income attributable to Duke Energy	1,598	1,045	1,327
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,302	2,327	2,207
Equity component of AFUDC	(51)	(42)	(66)
Impairment of assets and other charges	82	495	(24)
Deferred income taxes	247	(197)	433
Payments for asset retirement obligations	(288)	(384)	(412)
Provision for rate refunds	(36)	2	15
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	51	(9)	(34)
Receivables	(97)	(69)	47
Receivables from affiliated companies	18	(81)	81
Inventory	(26)	49	62
Other current assets	(551)	223	184
Increase (decrease) in
Accounts payable	59	(62)	(4)
Accounts payable to affiliated companies	217	(21)	(50)
Taxes accrued	13	75	(74)
Other current liabilities	(32)	139	25
Other assets	(110)	(137)	(341)
Other liabilities	(99)	(177)	(167)
Net cash provided by (used in) operating activities	3,298	3,177	3,209
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,668)	(3,488)	(3,952)
Purchases of debt and equity securities	(2,233)	(5,998)	(1,511)
Proceeds from sales and maturities of debt and equity securities	2,322	6,010	1,504
Notes receivable from affiliated companies		164	(164)
Other	(156)	(160)	(190)
Net cash used in investing activities	(3,735)	(3,472)	(4,313)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,095	1,791	2,187
Payments for the redemption of long-term debt	(1,883)	(2,157)	(1,667)
Notes payable to affiliated companies	(160)	1,148	586
Dividends to parent	(700)	(400)
Other	(2)	(13)	12
Net cash provided by financing activities	350	369	1,118
Net decrease in cash, cash equivalents and restricted cash	(87)	74	14
Cash, cash equivalents and restricted cash at beginning of period	200	126	112
Cash, cash equivalents and restricted cash at end of period	113	200	126
Cash, cash equivalents and restricted cash at beginning of period	59
Cash, cash equivalents and restricted cash at end of period	70	59
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	813	819	892
Cash received from income taxes	14	149	(79)
Significant non-cash transactions:
Accrued capital expenditures	501	363	447
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	991	415	805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,286	1,299	1,329
Equity component of AFUDC	(34)	(29)	(60)
Impairment of assets and other charges	63	499	12
Deferred income taxes	(46)	(234)	197
Payments for asset retirement obligations	(187)	(304)	(390)
Provision for rate refunds	(36)	2	12
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	48	1	(6)
Receivables	(52)	(4)	21
Receivables from affiliated companies	(33)	2	(29)
Inventory	(11)	23	20
Other current assets	(147)	98	101
Increase (decrease) in
Accounts payable	12	(127)	32
Accounts payable to affiliated companies	95	12	(75)
Taxes accrued	83	68	(46)
Other current liabilities	(23)	157	68
Other assets	(37)	(215)	(205)
Other liabilities	(16)	3	37
Net cash provided by (used in) operating activities	1,956	1,666	1,823
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,746)	(1,581)	(2,108)
Purchases of debt and equity securities	(1,931)	(1,555)	(842)
Proceeds from sales and maturities of debt and equity securities	1,914	1,516	810
Other	(20)	(57)	(119)
Net cash used in investing activities	(1,783)	(1,677)	(2,259)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,959	1,296	1,269
Payments for the redemption of long-term debt	(1,308)	(1,085)	(605)
Notes payable to affiliated companies	(123)	229	(228)
Distributions to parent	(700)	(400)
Other	(1)	(12)	(1)
Net cash provided by financing activities	(173)	28	435
Net decrease in cash, cash equivalents and restricted cash		17	(1)
Cash, cash equivalents and restricted cash at beginning of period	39	22	23
Cash, cash equivalents and restricted cash at end of period	39	39	22
Cash, cash equivalents and restricted cash at beginning of period	39
Cash, cash equivalents and restricted cash at end of period	35	39
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	335	301	331
Cash received from income taxes	83	123	(30)
Significant non-cash transactions:
Accrued capital expenditures	163	149	175
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	738	771	692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,011	1,019	869
Equity component of AFUDC	(16)	(12)	(6)
Impairment of assets and other charges	19	(4)	(36)
Deferred income taxes	279	27	180
Payments for asset retirement obligations	(101)	(80)	(22)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(14)	(33)
Receivables	(45)	(64)	26
Receivables from affiliated companies	(13)	(3)	17
Inventory	(15)	26	42
Other current assets	(451)	40	156
Increase (decrease) in
Accounts payable	47	66	(36)
Accounts payable to affiliated companies	124	(46)	40
Taxes accrued	(30)	39	(31)
Other current liabilities	(7)	(7)	(36)
Other assets	(69)	84	(131)
Other liabilities	(69)	(181)	(213)
Net cash provided by (used in) operating activities	1,402	1,661	1,478
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,923)	(1,907)	(1,844)
Purchases of debt and equity securities	(302)	(4,443)	(669)
Proceeds from sales and maturities of debt and equity securities	408	4,495	695
Notes receivable from affiliated companies		173	(173)
Other	(136)	(103)	(67)
Net cash used in investing activities	(1,953)	(1,785)	(2,058)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,135	495	918
Payments for the redemption of long-term debt	(575)	(572)	(262)
Notes payable to affiliated companies	3	196	(108)
Other		(1)	13
Net cash provided by financing activities	563	118	561
Net decrease in cash, cash equivalents and restricted cash	12	(6)	(19)
Cash, cash equivalents and restricted cash at beginning of period	50	56	75
Cash, cash equivalents and restricted cash at end of period	62	50	56
Cash, cash equivalents and restricted cash at beginning of period	11
Cash, cash equivalents and restricted cash at end of period	23	11
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	308	321	332
Cash received from income taxes	(15)	138	1
Significant non-cash transactions:
Accrued capital expenditures	337	214	272
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	204	252	238
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	311	283	269
Equity component of AFUDC	(7)	(7)	(13)
Impairment of assets and other charges	25
Deferred income taxes	42	31	81
Payments for asset retirement obligations	(2)	(2)	(8)
Provision for rate refunds	16	14	7
(Increase) decrease in
Receivables	6	(13)	20
Receivables from affiliated companies	(25)	9	22
Inventory	(6)	25	(9)
Other current assets	(60)	(18)	(5)
Increase (decrease) in
Accounts payable	38	2	(17)
Accounts payable to affiliated companies	(4)		(10)
Taxes accrued	26	30	17
Other current liabilities	11	3	1
Other assets	(43)	(32)	(26)
Other liabilities	27	(2)	(41)
Net cash provided by (used in) operating activities	559	575	526
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(848)	(834)	(952)
Notes receivable from affiliated companies	(10)	(19)
Other	(60)	(48)	(68)
Net cash used in investing activities	(918)	(901)	(1,020)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	150	467	1,003
Payments for the redemption of long-term debt	(50)		(551)
Notes payable to affiliated companies	(67)	(144)	38
Contribution from parent	325
Net cash provided by financing activities	358	323	490
Net (decrease) increase in cash, cash equivalents and restricted cash	(1)	(3)	(4)
Cash, cash equivalents and restricted cash at beginning of period	14	17	21
Cash, cash equivalents and restricted cash at end of period	13	14	17
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	107	97	97
Cash received from income taxes	9		(37)
Significant non-cash transactions:
Accrued capital expenditures	135	104	109
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	481	408	436
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	619	572	531
Equity component of AFUDC	(27)	(23)	(18)
Impairment of assets and other charges	9
Deferred income taxes	34	29	156
Payments for asset retirement obligations	(67)	(63)	(48)
(Increase) decrease in
Receivables	(33)	8	(8)
Receivables from affiliated companies			41
Inventory	55	44	(95)
Other current assets	(181)	(3)	76
Increase (decrease) in
Accounts payable	76	(12)	(10)
Accounts payable to affiliated companies	8	1	4
Taxes accrued	12	13	(25)
Other current liabilities	13	6	15
Other assets	20	(68)	(74)
Other liabilities	(15)	26	16
Net cash provided by (used in) operating activities	1,004	938	997
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(818)	(888)	(876)
Purchases of debt and equity securities	(142)	(37)	(26)
Proceeds from sales and maturities of debt and equity securities	65	22	20
Notes receivable from affiliated companies	(120)	(33)
Other	36	48	(49)
Net cash used in investing activities	(979)	(888)	(931)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	300	544	485
Payments for the redemption of long-term debt	(70)	(513)	(213)
Notes payable to affiliated companies	(131)	101	(137)
Distributions to parent	(125)	(200)	(200)
Net cash provided by financing activities	(26)	(68)	(65)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1)	(18)	1
Cash, cash equivalents and restricted cash at beginning of period	7	25	24
Cash, cash equivalents and restricted cash at end of period	6	7	25
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	194	164	150
Cash received from income taxes	56	36	(6)
Significant non-cash transactions:
Accrued capital expenditures	118	101	102
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	310	273	202
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	216	182	174
Equity in (earnings) losses of unconsolidated affiliates	(9)	(9)	(8)
Equity component of AFUDC	(20)	(19)
Impairment of assets and other charges	10	7
Deferred income taxes	4	53	136
Provision for rate refunds	(4)	(33)	2
(Increase) decrease in
Receivables	(77)	10	28
Receivables from affiliated companies	(1)		12
Inventory	(40)	3	(2)
Other current assets	33	(66)	(25)
Increase (decrease) in
Accounts payable	(25)	16	(7)
Accounts payable to affiliated companies	(39)	76	(35)
Taxes accrued	37	3	(60)
Other current liabilities	(26)	(11)	1
Other assets	26	(11)	1
Other liabilities	(4)	7	(10)
Net cash provided by (used in) operating activities	391	481	409
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(850)	(901)	(1,053)
Contributions to equity method investments	(9)		(16)
Return of investment capital	2	2	4
Other	(31)	(28)	(14)
Net cash used in investing activities	(890)	(929)	(1,083)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	347	394	596
Payments for the redemption of long-term debt	(160)		(350)
Notes payable to affiliated companies	(13)	54	278
Contribution from parent	325		150
Net cash provided by financing activities	499	448	674
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	114	115	84
Cash received from income taxes	(13)	(36)	(31)
Significant non-cash transactions:
Accrued capital expenditures	$ 97	$ 106	$ 109