Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Operating Revenues
Regulated electric	$ 5,124		$ 5,285
Regulated natural gas	638		728
Nonregulated electric and other	187		150
Total operating revenues	5,949		6,163
Operating Expenses
Operation, maintenance and other	1,339		1,419
Depreciation and amortization	1,130		1,089
Property and other taxes	345		343
Impairment charges	2
Total operating expenses	4,462		4,787
Gains (Losses) on Sales of Other Assets and Other, net	1		(3)
Operating Income	1,488		1,373
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	44		43
Other income and expenses, net	46		115
Total other income and expenses	90		158
Interest Expense	551		543
Income Before Income Taxes	1,027		988
Income Tax Expense	137		95
Net Income	890		893
Less: Net Loss Attributable to Noncontrolling Interests	(48)		(7)
Net Income Attributable to Parent	938		900
Less: Preferred Dividends	39
Net Income (Loss) Available to Common Stockholders, Basic	899		900
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	1
Net unrealized (losses) gains on cash flow hedges	(81)		(17)
Unrealized gains on available-for-sale securities	1		4
Other Comprehensive Loss, net of tax	(77)	[1]	(12)
Comprehensive Income	813		881
Less: Comprehensive Loss Attributable to Noncontrolling Interests	(62)		(7)
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	$ 836		$ 888
Net income attributable to Duke Energy Corporation common stockholders
Basic and Diluted (in usd per share)	$ 1.24		$ 1.24
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic	734		727
Weighted Average Number of Shares Outstanding, Diluted	736		727
Duke Energy Carolinas
Operating Revenues
Total operating revenues	$ 1,748		$ 1,744
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	453		472
Operation, maintenance and other	386		440
Depreciation and amortization	343		317
Property and other taxes	81		80
Impairment charges	2
Total operating expenses	1,265		1,309
Gains (Losses) on Sales of Other Assets and Other, net	1
Operating Income	484		435
Other Income and Expenses
Total other income and expenses	43		31
Interest Expense	123		110
Income Before Income Taxes	404		356
Income Tax Expense	65		63
Net Income Attributable to Parent	339		293
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	339		293
Progress Energy
Operating Revenues
Total operating revenues	2,422		2,572
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	763		925
Operation, maintenance and other	554		567
Depreciation and amortization	452		455
Property and other taxes	135		137
Total operating expenses	1,904		2,084
Gains (Losses) on Sales of Other Assets and Other, net	(1)
Operating Income	517		488
Other Income and Expenses
Total other income and expenses	32		31
Interest Expense	206		219
Income Before Income Taxes	343		300
Income Tax Expense	60		52
Net Income	283		248
Less: Net Loss Attributable to Noncontrolling Interests			(1)
Net Income Attributable to Parent	283		249
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments			1
Net unrealized (losses) gains on cash flow hedges	1		2
Unrealized gains on available-for-sale securities	1
Other Comprehensive Loss, net of tax	2		3
Comprehensive Income	285		251
Less: Comprehensive Loss Attributable to Noncontrolling Interests			(1)
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	285		252
Duke Energy Progress
Operating Revenues
Total operating revenues	1,338		1,484
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	405		515
Operation, maintenance and other	305		335
Depreciation and amortization	287		290
Property and other taxes	47		44
Total operating expenses	1,044		1,184
Gains (Losses) on Sales of Other Assets and Other, net	(1)
Operating Income	293		300
Other Income and Expenses
Total other income and expenses	22		24
Interest Expense	69		77
Income Before Income Taxes	246		247
Income Tax Expense	42		44
Net Income Attributable to Parent	204		203
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	204		203
Duke Energy Florida
Operating Revenues
Total operating revenues	1,080		1,086
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	358		410
Operation, maintenance and other	245		230
Depreciation and amortization	165		165
Property and other taxes	88		93
Total operating expenses	856		898
Operating Income	224		188
Other Income and Expenses
Total other income and expenses	10		13
Interest Expense	84		82
Income Before Income Taxes	150		119
Income Tax Expense	30		23
Net Income Attributable to Parent	120		96
Other Comprehensive Income (Loss), net of tax
Unrealized gains on available-for-sale securities	1		1
Other Comprehensive Loss, net of tax	1		1
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	121		97
Duke Energy Ohio
Operating Revenues
Regulated electric	346		355
Regulated natural gas	152		176
Total operating revenues	498		531
Operating Expenses
Operation, maintenance and other	123		132
Depreciation and amortization	68		64
Property and other taxes	83		84
Total operating expenses	398		427
Operating Income	100		104
Other Income and Expenses
Total other income and expenses	3		9
Interest Expense	24		30
Income Before Income Taxes	79		83
Income Tax Expense	14		14
Net Income Attributable to Parent	65		69
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	65		69
Duke Energy Indiana
Operating Revenues
Total operating revenues	692		768
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	194		257
Operation, maintenance and other	186		189
Depreciation and amortization	132		131
Property and other taxes	22		19
Total operating expenses	534		596
Gains (Losses) on Sales of Other Assets and Other, net			(3)
Operating Income	158		169
Other Income and Expenses
Total other income and expenses	10		19
Interest Expense	43		43
Income Before Income Taxes	125		145
Income Tax Expense	26		35
Net Income Attributable to Parent	99		110
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	99		110
Piedmont Natural Gas
Operating Revenues
Total operating revenues	512		579
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	162		273
Operation, maintenance and other	80		80
Depreciation and amortization	45		42
Property and other taxes	12		12
Total operating expenses	299		407
Operating Income	213		172
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	2		2
Other income and expenses, net	12		6
Interest Expense	27		22
Income Before Income Taxes	198		156
Income Tax Expense	20		34
Net Income Attributable to Parent	178		122
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	178		122
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	87		93
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	1,447		1,609
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	199		327
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	$ 37		$ 54

[1] Net of income tax impact of approximately $23 million in the first quarter of 2020 and immaterial income tax impact in the first quarter of 2019.