Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenues
Regulated electric		$ 6,495	$ 6,315	$ 16,972	$ 16,402
Regulated natural gas		263	214	1,314	1,115
Nonregulated electric and other		193	192	573	574
Total operating revenues		6,951	6,721	18,859	18,091
Operating Expenses
Operation, maintenance and other		1,507	1,450	4,319	4,142
Depreciation and amortization		1,265	1,217	3,698	3,497
Property and other taxes		371	324	1,073	1,003
Impairment of assets and other charges		211	28	342	36
Total operating expenses		5,273	4,909	14,564	13,622
(Losses) Gains on Sales of Other Assets and Other, net		9	2	11	10
Operating Income		1,687	1,814	4,306	4,479
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		22	(80)	14	(2,004)
Other income and expenses, net		238	127	493	310
Total other income and expenses		260	47	507	(1,694)
Interest Expense		581	522	1,688	1,627
Income Before Income Taxes		1,366	1,339	3,125	1,158
Income Tax Expense (Benefit)		90	105	210	(74)
Net Income		1,276	1,234	2,915	1,232
Add: Net Loss Attributable to Noncontrolling Interests		129	70	247	208
Net Income and Comprehensive Income		1,405	1,304	3,162	1,440
Less: Preferred Dividends		39	39	92	93
Net Income Available to Duke Energy Corporation Common Stockholders		1,366	1,265	3,070	1,347
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	1	3	1
Net unrealized (losses) gains on cash flow hedges	[1]	9	(83)	(59)	(159)
Unrealized (losses) gains on available-for-sale securities	[1]	(2)	(2)	(6)	5
Other Comprehensive Income (Loss), net of tax	[1]	10	(80)	(53)	(145)
Comprehensive Income		1,286	1,154	2,862	1,087
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(128)	(70)	(240)	(220)
Comprehensive Income Attributable to Duke Energy		$ 1,414	$ 1,224	$ 3,102	$ 1,307
Net income (loss) attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		$ 1.79	$ 1.74	$ 4.00	$ 1.85
Diluted (in usd per share)		$ 1.79	$ 1.74	$ 4.00	$ 1.85
Weighted Average Shares Outstanding
Basic (in shares)		769	735	769	735
Diluted (in shares)		769	735	769	735
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 2,104	$ 2,058	$ 5,430	$ 5,416
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		452	497	1,218	1,326
Operation, maintenance and other		471	402	1,347	1,218
Depreciation and amortization		366	372	1,088	1,090
Property and other taxes		91	57	248	213
Impairment of assets and other charges		163	20	238	22
Total operating expenses		1,543	1,348	4,139	3,869
(Losses) Gains on Sales of Other Assets and Other, net		(1)	1	1	1
Operating Income		560	711	1,292	1,548
Other Income and Expenses
Total other income and expenses		126	42	218	128
Interest Expense		137	122	400	370
Income Before Income Taxes		549	631	1,110	1,306
Income Tax Expense (Benefit)		16	76	40	178
Net Income and Comprehensive Income		533	555	1,070	1,128
Progress Energy
Operating Revenues
Total operating revenues		3,233	3,197	8,417	8,117
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,074	1,088	2,702	2,628
Operation, maintenance and other		636	646	1,863	1,789
Depreciation and amortization		504	472	1,430	1,356
Property and other taxes		144	147	419	419
Impairment of assets and other charges		42	1	79	1
Total operating expenses		2,400	2,354	6,493	6,193
(Losses) Gains on Sales of Other Assets and Other, net		8	3	9	9
Operating Income		841	846	1,933	1,933
Other Income and Expenses
Total other income and expenses		86	24	167	89
Interest Expense		200	194	592	599
Income Before Income Taxes		727	676	1,508	1,423
Income Tax Expense (Benefit)		94	70	174	190
Net Income		633	606	1,334	1,233
Add: Net Loss Attributable to Noncontrolling Interests		(1)	(1)	(1)	(1)
Net Income and Comprehensive Income		632	605	1,333	1,232
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		(1)			1
Net unrealized (losses) gains on cash flow hedges		1	1	2	3
Unrealized (losses) gains on available-for-sale securities			1		1
Other Comprehensive Income (Loss), net of tax			2	2	5
Comprehensive Income		633	608	1,336	1,238
Add: Comprehensive Loss Attributable to Noncontrolling Interests		1	1	1	1
Comprehensive Income Attributable to Duke Energy		632	607	1,335	1,237
Duke Energy Progress
Operating Revenues
Total operating revenues		1,667	1,626	4,417	4,207
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		523	537	1,368	1,337
Operation, maintenance and other		368	348	1,092	970
Depreciation and amortization		290	289	811	833
Property and other taxes		39	38	129	129
Impairment of assets and other charges		42	5	60	5
Total operating expenses		1,262	1,217	3,460	3,274
(Losses) Gains on Sales of Other Assets and Other, net		7	3	8	8
Operating Income		412	412	965	941
Other Income and Expenses
Total other income and expenses		67	11	111	52
Interest Expense		79	66	226	203
Income Before Income Taxes		400	357	850	790
Income Tax Expense (Benefit)		25	11	50	79
Net Income and Comprehensive Income		375	346	800	711
Duke Energy Florida
Operating Revenues
Total operating revenues		1,561	1,567	3,987	3,897
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		552	551	1,335	1,291
Operation, maintenance and other		263	292	760	806
Depreciation and amortization		214	183	619	523
Property and other taxes		105	110	290	290
Impairment of assets and other charges			(4)	19	(4)
Total operating expenses		1,134	1,132	3,023	2,906
(Losses) Gains on Sales of Other Assets and Other, net		1		1
Operating Income		428	435	965	991
Other Income and Expenses
Total other income and expenses		18	11	54	36
Interest Expense		79	81	239	245
Income Before Income Taxes		367	365	780	782
Income Tax Expense (Benefit)		70	78	149	159
Net Income and Comprehensive Income		297	287	631	623
Other Comprehensive Income (Loss), net of tax
Unrealized (losses) gains on available-for-sale securities			1		1
Other Comprehensive Income (Loss), net of tax			1		1
Comprehensive Income Attributable to Duke Energy		297	288	631	624
Duke Energy Ohio
Operating Revenues
Regulated electric		413	394	1,119	1,070
Regulated natural gas		93	79	375	324
Total operating revenues		506	473	1,494	1,394
Operating Expenses
Operation, maintenance and other		116	115	335	333
Depreciation and amortization		79	72	228	208
Property and other taxes		91	83	266	244
Impairment of assets and other charges				5
Total operating expenses		414	367	1,204	1,089
Operating Income		92	106	290	305
Other Income and Expenses
Total other income and expenses		4	4	14	11
Interest Expense		29	26	82	75
Income Before Income Taxes		67	84	222	241
Income Tax Expense (Benefit)		9	14	34	40
Net Income and Comprehensive Income		58	70	188	201
Duke Energy Indiana
Operating Revenues
Total operating revenues		886	761	2,366	2,070
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		292	222	710	577
Operation, maintenance and other		173	207	543	564
Depreciation and amortization		154	149	458	415
Property and other taxes		16	15	57	57
Impairment of assets and other charges				8
Total operating expenses		635	593	1,776	1,613
(Losses) Gains on Sales of Other Assets and Other, net		1
Operating Income		252	168	590	457
Other Income and Expenses
Total other income and expenses		12	9	31	28
Interest Expense		49	29	148	114
Income Before Income Taxes		215	148	473	371
Income Tax Expense (Benefit)		34	29	77	72
Net Income and Comprehensive Income		181	119	396	299
Piedmont
Operating Revenues
Total operating revenues		195	162	1,016	871
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		66	39	354	254
Operation, maintenance and other		77	75	231	234
Depreciation and amortization		51	45	150	133
Property and other taxes		16	13	44	37
Impairment of assets and other charges		4	7	9	7
Total operating expenses		214	179	788	665
Operating Income		(19)	(17)	228	206
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates				7	7
Total other income and expenses		16	16	51	44
Interest Expense		29	29	88	89
Income Before Income Taxes		(32)	(30)	191	161
Income Tax Expense (Benefit)		(8)	(5)	16	6
Net Income and Comprehensive Income		(24)	(25)	175	155
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,844	1,849	4,702	4,645
Fuel used in electric generation and purchased power | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		119	94	294	258
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		75	41	430	299
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 9	$ 3	$ 76	$ 46

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.