Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Operating Revenues
Regulated electric		$ 5,219	$ 5,124
Regulated natural gas		749	638
Nonregulated electric and other		182	187
Total operating revenues		6,150	5,949
Operating Expenses
Operation, maintenance and other		1,402	1,339
Depreciation and amortization		1,226	1,130
Property and other taxes		353	345
Impairment of assets and other charges			2
Total operating expenses		4,700	4,462
Gains on Sales of Other Assets and Other, net			1
Operating Income		1,450	1,488
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		(17)	44
Other income and expenses, net		127	46
Total other income and expenses		110	90
Interest Expense		535	551
Income Before Income Taxes		1,025	1,027
Income Tax Expense		84	137
Net Income		941	890
Add: Net Loss Attributable to Noncontrolling Interests		51	48
Net Income and Comprehensive Income		992	938
Less: Preferred Dividends		39	39
Net Income Available to Duke Energy Corporation Common Stockholders		953	899
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	2	1
Net unrealized (losses) gains on cash flow hedges	[1]	29	(81)
Unrealized (losses) gains on available-for-sale securities	[1]	(8)	1
Other Comprehensive Income (Loss), net of tax	[1]	26	(77)
Comprehensive Income		967	813
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(44)	(62)
Comprehensive Income Attributable to Duke Energy		$ 1,011	$ 875
Net income attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		$ 1.25	$ 1.24
Diluted (in usd per share)		$ 1.25	$ 1.24
Weighted Average Shares Outstanding
Basic (in shares)		769	734
Diluted (in shares)		769	736
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 1,716	$ 1,748
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		422	453
Operation, maintenance and other		441	386
Depreciation and amortization		359	343
Property and other taxes		83	81
Impairment of assets and other charges			2
Total operating expenses		1,305	1,265
Gains on Sales of Other Assets and Other, net			1
Operating Income		411	484
Other Income and Expenses
Total other income and expenses		48	43
Interest Expense		124	123
Income Before Income Taxes		335	404
Income Tax Expense		23	65
Net Income and Comprehensive Income		312	339
Progress Energy
Operating Revenues
Total operating revenues		2,505	2,422
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		795	763
Operation, maintenance and other		601	554
Depreciation and amortization		485	452
Property and other taxes		142	135
Total operating expenses		2,023	1,904
Gains on Sales of Other Assets and Other, net			(1)
Operating Income		482	517
Other Income and Expenses
Total other income and expenses		43	32
Interest Expense		192	206
Income Before Income Taxes		333	343
Income Tax Expense		43	60
Net Income		290	283
Other Comprehensive Income (Loss), net of tax
Net unrealized (losses) gains on cash flow hedges		1	1
Unrealized (losses) gains on available-for-sale securities		(1)	1
Other Comprehensive Income (Loss), net of tax			2
Comprehensive Income		290	285
Duke Energy Progress
Operating Revenues
Total operating revenues		1,401	1,338
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		436	405
Operation, maintenance and other		357	305
Depreciation and amortization		285	287
Property and other taxes		49	47
Total operating expenses		1,127	1,044
Gains on Sales of Other Assets and Other, net			(1)
Operating Income		274	293
Other Income and Expenses
Total other income and expenses		24	22
Interest Expense		69	69
Income Before Income Taxes		229	246
Income Tax Expense		19	42
Net Income and Comprehensive Income		210	204
Duke Energy Florida
Operating Revenues
Total operating revenues		1,101	1,080
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		359	358
Operation, maintenance and other		242	245
Depreciation and amortization		200	165
Property and other taxes		93	88
Total operating expenses		894	856
Operating Income		207	224
Other Income and Expenses
Total other income and expenses		18	10
Interest Expense		80	84
Income Before Income Taxes		145	150
Income Tax Expense		28	30
Net Income and Comprehensive Income		117	120
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		116	121
Duke Energy Ohio
Operating Revenues
Regulated electric		363	346
Regulated natural gas		169	152
Total operating revenues		532	498
Operating Expenses
Operation, maintenance and other		108	123
Depreciation and amortization		74	68
Property and other taxes		92	83
Total operating expenses		407	398
Operating Income		125	100
Other Income and Expenses
Total other income and expenses		5	3
Interest Expense		25	24
Income Before Income Taxes		105	79
Income Tax Expense		14	14
Net Income and Comprehensive Income		91	65
Duke Energy Indiana
Operating Revenues
Total operating revenues		745	692
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		217	194
Operation, maintenance and other		178	186
Depreciation and amortization		152	132
Property and other taxes		21	22
Total operating expenses		568	534
Operating Income		177	158
Other Income and Expenses
Total other income and expenses		9	10
Interest Expense		50	43
Income Before Income Taxes		136	125
Income Tax Expense		24	26
Net Income and Comprehensive Income		112	99
Piedmont
Operating Revenues
Total operating revenues		606	512
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		225	162
Operation, maintenance and other		78	80
Depreciation and amortization		48	45
Property and other taxes		14	12
Total operating expenses		365	299
Operating Income		241	213
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		2	2
Total other income and expenses		17	12
Interest Expense		29	27
Income Before Income Taxes		229	198
Income Tax Expense		26	20
Net Income and Comprehensive Income		203	178
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,443	1,447
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		82	87
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		276	199
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 51	$ 37

[1] Net of income tax impacts of approximately $8 million and $23 million for the three months ended March 31, 2021, and 2020, respectively.