Progress Energy (PREX) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	1-32853
Entity Registrant Name	DUKE ENERGY CORPORATION
Entity Tax Identification Number	20-2777218
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	550 South Tryon Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		735,432,137
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001326160
Duke Energy Carolinas
Document Information [Line Items]
Entity File Number	1-4928
Entity Registrant Name	DUKE ENERGY CAROLINAS, LLC
Entity Tax Identification Number	56-0205520
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	526 South Church Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000030371
Progress Energy
Document Information [Line Items]
Entity File Number	1-15929
Entity Registrant Name	PROGRESS ENERGY, INC.
Entity Tax Identification Number	56-2155481
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001094093
Duke Energy Progress
Document Information [Line Items]
Entity File Number	1-3382
Entity Registrant Name	DUKE ENERGY PROGRESS, LLC
Entity Tax Identification Number	56-0165465
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000017797
Duke Energy Florida
Document Information [Line Items]
Entity File Number	1-3274
Entity Registrant Name	DUKE ENERGY FLORIDA, LLC
Entity Tax Identification Number	59-0247770
Entity Incorporation, State or Country Code	FL
Entity Address, Address Line One	299 First Avenue North
Entity Address, City or Town	St. Petersburg
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33701
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000037637
Duke Energy Ohio
Document Information [Line Items]
Entity File Number	1-1232
Entity Registrant Name	DUKE ENERGY OHIO, INC.
Entity Tax Identification Number	31-0240030
Entity Incorporation, State or Country Code	OH
Entity Address, Address Line One	139 East Fourth Street
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45202
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000020290
Duke Energy Indiana
Document Information [Line Items]
Entity File Number	1-3543
Entity Registrant Name	DUKE ENERGY INDIANA, LLC
Entity Tax Identification Number	35-0594457
Entity Incorporation, State or Country Code	IN
Entity Address, Address Line One	1000 East Main Street
Entity Address, City or Town	Plainfield
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46168
City Area Code	704
Local Phone Number	382-3853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000081020
Piedmont Natural Gas
Document Information [Line Items]
Entity File Number	1-6196
Entity Registrant Name	PIEDMONT NATURAL GAS COMPANY, INC.
Entity Tax Identification Number	56-0556998
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	4720 Piedmont Row Drive
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28210
City Area Code	704
Local Phone Number	364-3120
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000078460
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	DUK
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.125% Coupon Due January 2073 [Member]
Document Information [Line Items]
Title of 12(b) Security	5.125% Junior Subordinated Debentures
Trading Symbol	DUKH
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.625% Coupon Due September 2078 [Member]
Document Information [Line Items]
Title of 12(b) Security	5.625% Junior Subordinated Debentures
Trading Symbol	DUKB
Security Exchange Name	NYSE
Depositary Share [Member]
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	DUK PR A
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues
Regulated electric		$ 4,963	$ 5,423	$ 10,087	$ 10,708
Regulated natural gas		263	280	901	1,008
Nonregulated electric and other		195	170	382	320
Total operating revenues		5,421	5,873	11,370	12,036
Operating Expenses
Operation, maintenance and other		1,353	1,434	2,692	2,853
Depreciation and amortization		1,150	1,089	2,280	2,178
Property and other taxes		334	334	679	677
Impairment charges		6	4	8	4
Total operating expenses		4,251	4,578	8,713	9,365
Gains (Losses) on Sales of Other Assets and Other, net		7	3	8
Operating Income		1,177	1,298	2,665	2,671
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		(1,968)	44	(1,924)	87
Other Nonoperating Income (Expense)		137	89	183	204
Total other income and expenses		(1,831)	133	(1,741)	291
Interest Expense		554	542	1,105	1,085
(Loss) Income Before Income Taxes		(1,208)	889	(181)	1,877
Income Tax (Benefit) Expense		(316)	141	(179)	236
Net (Loss) Income		(892)	748	(2)	1,641
Add: Net Loss Attributable to Noncontrolling Interests		90	84	138	91
Net income (attributable to parent)		(802)	832	136	1,732
Less: Preferred Dividends		15	12	54	12
Net (Loss) Income Available to Duke Energy Corporation Common Stockholders		(817)	820	82	1,720
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	(1)	3		3
Net unrealized (losses) gains on cash flow hedges	[1]	5	(29)	(76)	(46)
Unrealized (losses) gains on available-for-sale securities	[1]	6	4	7	8
Other Comprehensive Income (Loss), net of tax	[1]	12	(20)	(65)	(32)
Comprehensive (Loss) Income		(880)	728	(67)	1,609
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(88)	(84)	(150)	(91)
Comprehensive (Loss) Income Attributable to Duke Energy		$ (792)	$ 812	$ 83	$ 1,700
Net income attributable to Duke Energy Corporation common stockholders
Basic and Diluted (in usd per share)		$ (1.13)	$ 1.12	$ 0.11	$ 2.36
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic		735	728	734	728
Weighted Average Number of Shares Outstanding, Diluted		735	728	735	728
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 1,610	$ 1,713	$ 3,358	$ 3,457
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		376	395	829	867
Operation, maintenance and other		430	441	816	881
Depreciation and amortization		375	346	718	663
Property and other taxes		75	75	156	155
Impairment charges			5	2	5
Total operating expenses		1,256	1,262	2,521	2,571
Gains (Losses) on Sales of Other Assets and Other, net		(1)
Operating Income		353	451	837	886
Other Income and Expenses
Total other income and expenses		43	41	86	72
Interest Expense		125	117	248	227
(Loss) Income Before Income Taxes		271	375	675	731
Income Tax (Benefit) Expense		37	74	102	137
Net income (attributable to parent)		234	301	573	594
Other Comprehensive Income (Loss), net of tax
Comprehensive (Loss) Income Attributable to Duke Energy		234	301	573	594
Progress Energy
Operating Revenues
Total operating revenues		2,498	2,744	4,920	5,316
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		777	988	1,540	1,913
Operation, maintenance and other		589	606	1,143	1,173
Depreciation and amortization		432	426	884	881
Property and other taxes		137	143	272	280
Total operating expenses		1,935	2,163	3,839	4,247
Gains (Losses) on Sales of Other Assets and Other, net		7	(1)	6	(1)
Operating Income		570	580	1,087	1,068
Other Income and Expenses
Total other income and expenses		33	34	65	65
Interest Expense		199	219	405	438
(Loss) Income Before Income Taxes		404	395	747	695
Income Tax (Benefit) Expense		60	66	120	118
Net (Loss) Income		344	329	627	577
Add: Net Loss Attributable to Noncontrolling Interests		0	(1)		0
Net income (attributable to parent)		344	328	627	577
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		1	1	1	2
Net unrealized (losses) gains on cash flow hedges		1	1	2	3
Unrealized (losses) gains on available-for-sale securities		(1)	1	0	1
Other Comprehensive Income (Loss), net of tax		1	3	3	6
Comprehensive (Loss) Income		345	332	630	583
Add: Comprehensive Loss Attributable to Noncontrolling Interests			1		0
Comprehensive (Loss) Income Attributable to Duke Energy		345	331	630	583
Duke Energy Progress
Operating Revenues
Total operating revenues		1,243	1,387	2,581	2,871
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		395	479	800	994
Operation, maintenance and other		317	357	622	692
Depreciation and amortization		257	251	544	541
Property and other taxes		44	41	91	85
Total operating expenses		1,013	1,128	2,057	2,312
Gains (Losses) on Sales of Other Assets and Other, net		6		5
Operating Income		236	259	529	559
Other Income and Expenses
Total other income and expenses		19	24	41	48
Interest Expense		68	81	137	158
(Loss) Income Before Income Taxes		187	202	433	449
Income Tax (Benefit) Expense		26	33	68	77
Net income (attributable to parent)		161	169	365	372
Other Comprehensive Income (Loss), net of tax
Comprehensive (Loss) Income Attributable to Duke Energy		161	169	365	372
Duke Energy Florida
Operating Revenues
Total operating revenues		1,250	1,353	2,330	2,439
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		382	509	740	919
Operation, maintenance and other		269	244	514	474
Depreciation and amortization		175	175	340	340
Property and other taxes		92	103	180	196
Total operating expenses		918	1,031	1,774	1,929
Gains (Losses) on Sales of Other Assets and Other, net			(1)		(1)
Operating Income		332	321	556	509
Other Income and Expenses
Total other income and expenses		15	12	25	25
Interest Expense		80	83	164	165
(Loss) Income Before Income Taxes		267	250	417	369
Income Tax (Benefit) Expense		51	49	81	72
Net income (attributable to parent)		216	201	336	297
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 (Loss) Income Attributable to Duke Energy		215	201	336	298
Duke Energy Ohio
Operating Revenues
Regulated electric		330	336	676	691
Regulated natural gas		93	97	245	273
Total operating revenues		423	433	921	964
Operating Expenses
Operation, maintenance and other		95	123	218	255
Depreciation and amortization		68	66	136	130
Property and other taxes		78	74	161	158
Total operating expenses		324	359	722	786
Operating Income		99	74	199	178
Other Income and Expenses
Total other income and expenses		4	6	7	15
Interest Expense		25	24	49	54
(Loss) Income Before Income Taxes		78	56	157	139
Income Tax (Benefit) Expense		12	9	26	23
Net income (attributable to parent)		66	47	131	116
Other Comprehensive Income (Loss), net of tax
Comprehensive (Loss) Income Attributable to Duke Energy		66	47	131	116
Duke Energy Indiana
Operating Revenues
Total operating revenues		617	714	1,309	1,482
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		161	229	355	486
Operation, maintenance and other		171	188	357	377
Depreciation and amortization		134	132	266	263
Property and other taxes		20	20	42	39
Total operating expenses		486	569	1,020	1,165
Gains (Losses) on Sales of Other Assets and Other, net			3
Operating Income		131	148	289	317
Other Income and Expenses
Total other income and expenses		9	8	19	27
Interest Expense		42	28	85	71
(Loss) Income Before Income Taxes		98	128	223	273
Income Tax (Benefit) Expense		17	31	43	66
Net income (attributable to parent)		81	97	180	207
Other Comprehensive Income (Loss), net of tax
Comprehensive (Loss) Income Attributable to Duke Energy		81	97	180	207
Piedmont Natural Gas
Operating Revenues
Total operating revenues		197	209	709	788
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		53	65	215	338
Operation, maintenance and other		79	83	159	163
Depreciation and amortization		43	42	88	84
Property and other taxes		12	13	24	25
Total operating expenses		187	203	486	610
Operating Income		10	6	223	178
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates				4	4
Total other income and expenses		16	6	28	12
Interest Expense		33	21	60	43
(Loss) Income Before Income Taxes		(7)	(9)	191	147
Income Tax (Benefit) Expense		(9)	(2)	11	32
Net income (attributable to parent)		2	(7)	180	115
Other Comprehensive Income (Loss), net of tax
Comprehensive (Loss) Income Attributable to Duke Energy		2	(7)	180	115
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,349	1,641	2,796	3,250
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		77	86	164	179
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		59	76	258	403
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 6	$ 10	$ 43	$ 64
[1]	Net of income tax impacts of approximately $20 million and $10 million for the six months ended June 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net (loss) income		$ (892)	$ 748	$ (2)	$ 1,641
Other Comprehensive Loss, net of tax(a)
Pension and OPEB adjustments	[1]	(1)	3		3
Net unrealized gains (losses) on cash flow hedges	[1]	5	(29)	(76)	(46)
Reclassification into earnings from cash flow hedges	[1]	2	2	4	3
Unrealized gains on available-for-sale securities	[1]	6	4	7	8
Other Comprehensive Income (Loss), net of tax	[1]	12	(20)	(65)	(32)
Comprehensive (Loss) Income		(880)	728	(67)	1,609
Add: Comprehensive Loss Attributable to Noncontrolling Interests		88	84	150	91
Comprehensive (Loss) Income Attributable to Duke Energy		(792)	812	83	1,700
Less: Preferred Dividends		15	12	54	12
Comprehensive (Loss) Income Available to Duke Energy Corporation Common Stockholders		$ (807)	$ 800	$ 29	$ 1,688
[1]	Net of income tax impacts of approximately $20 million and $10 million for the six months ended June 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), tax	$ 20	$ 10

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 341	$ 311
Receivables (net of allowance for doubtful accounts)	753	1,066
Receivables of VIEs (net of allowance for doubtful accounts)	2,049	1,994
Inventory	3,289	3,232
Regulatory assets (includes amounts related to VIEs)	1,774	1,796
Other (includes amounts related to VIEs)	1,031	764
Total current assets	9,237	9,163
Property, Plant and Equipment
Cost	151,592	147,654
Accumulated depreciation and amortization	(47,295)	(45,773)
Generation facilities to be retired, net	28	246
Net property, plant and equipment	104,325	102,127
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets (includes amounts related to VIEs)	13,285	13,222
Nuclear decommissioning trust funds	8,000	8,140
Operating lease right-of-use assets, net	1,580	1,658
Investments in equity method unconsolidated affiliates	861	1,936
Other (includes amounts related to VIEs)	3,458	3,289
Total other noncurrent assets	46,487	47,548
Total Assets	160,049	158,838
Current Liabilities
Accounts payable	2,398	3,487
Notes payable and commercial paper	4,785	3,135
Taxes accrued	657	392
Interest accrued	569	565
Current maturities of long-term debt (includes amounts related to VIEs)	3,756	3,141
Asset retirement obligations	729	881
Regulatory liabilities	898	784
Other	2,898	2,367
Total current liabilities	16,690	14,752
Long-Term Debt (includes amounts related to VIEs)	56,143	54,985
Other Noncurrent Liabilities
Deferred income taxes	8,979	8,878
Asset retirement obligations	12,539	12,437
Regulatory liabilities	14,553	15,264
Operating lease liabilities	1,377	1,432
Accrued pension and other post-retirement benefit costs	911	934
Investment tax credits	683	624
Other (includes amounts related to VIEs)	1,563	1,581
Total other noncurrent liabilities	40,605	41,150
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	40,997	40,881
Retained earnings	2,707	4,108
Accumulated other comprehensive loss	(183)	(130)
Total Duke Energy Corporation stockholders' equity	45,484	46,822
Noncontrolling interests	1,127	1,129
Total equity	46,611	47,951
Total Liabilities and Equity	160,049	158,838
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	24	18
Receivables (net of allowance for doubtful accounts)	255	324
Receivables of VIEs (net of allowance for doubtful accounts)	675	642
Receivables from affiliated companies	78	114
Inventory	1,080	996
Regulatory assets (includes amounts related to VIEs)	490	550
Other (includes amounts related to VIEs)	19	21
Total current assets	2,621	2,665
Property, Plant and Equipment
Cost	50,068	48,922
Accumulated depreciation and amortization	(17,098)	(16,525)
Net property, plant and equipment	32,970	32,397
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	3,440	3,360
Nuclear decommissioning trust funds	4,265	4,359
Operating lease right-of-use assets, net	125	123
Other (includes amounts related to VIEs)	1,158	1,149
Total other noncurrent assets	8,988	8,991
Total Assets	44,579	44,053
Current Liabilities
Accounts payable	615	954
Accounts payable to affiliated companies	147	210
Notes payable to affiliated companies	131	29
Taxes accrued	166	46
Interest accrued	127	115
Current maturities of long-term debt (includes amounts related to VIEs)	508	458
Asset retirement obligations	194	206
Regulatory liabilities	293	255
Other	488	611
Total current liabilities	2,669	2,884
Long-Term Debt (includes amounts related to VIEs)	11,713	11,142
Long-Term Debt Payable to Affiliated Companies	300	300
Other Noncurrent Liabilities
Deferred income taxes	4,004	3,921
Asset retirement obligations	5,566	5,528
Regulatory liabilities	6,232	6,423
Operating lease liabilities	106	102
Accrued pension and other post-retirement benefit costs	77	84
Investment tax credits	229	231
Other (includes amounts related to VIEs)	611	627
Total other noncurrent liabilities	16,825	16,916
Equity
Member's equity	13,079	12,818
Accumulated other comprehensive loss	(7)	(7)
Total member's equity	13,072	12,811
Total Liabilities and Equity	44,579	44,053
Progress Energy
Current Assets
Cash and cash equivalents	78	48
Receivables (net of allowance for doubtful accounts)	153	220
Receivables of VIEs (net of allowance for doubtful accounts)	920	830
Receivables from affiliated companies	42	76
Notes receivable from affiliated companies		164
Inventory	1,466	1,423
Regulatory assets (includes amounts related to VIEs)	957	946
Other (includes amounts related to VIEs)	145	210
Total current assets	3,761	3,917
Property, Plant and Equipment
Cost	56,420	55,070
Accumulated depreciation and amortization	(17,704)	(17,159)
Generation facilities to be retired, net	28	246
Net property, plant and equipment	38,744	38,157
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets (includes amounts related to VIEs)	6,308	6,346
Nuclear decommissioning trust funds	3,734	3,782
Operating lease right-of-use assets, net	737	788
Other (includes amounts related to VIEs)	1,164	1,049
Total other noncurrent assets	15,598	15,620
Total Assets	58,103	57,694
Current Liabilities
Accounts payable	675	1,104
Accounts payable to affiliated companies	222	310
Notes payable to affiliated companies	2,373	1,821
Taxes accrued	201	46
Interest accrued	213	228
Current maturities of long-term debt (includes amounts related to VIEs)	1,829	1,577
Asset retirement obligations	357	485
Regulatory liabilities	388	330
Other	847	902
Total current liabilities	7,105	6,803
Long-Term Debt (includes amounts related to VIEs)	17,625	17,907
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	4,560	4,462
Asset retirement obligations	6,038	5,986
Regulatory liabilities	4,813	5,225
Operating lease liabilities	662	697
Accrued pension and other post-retirement benefit costs	480	488
Other (includes amounts related to VIEs)	449	383
Total other noncurrent liabilities	17,002	17,241
Equity
Additional paid-in capital	9,143	9,143
Retained earnings	7,090	6,465
Accumulated other comprehensive loss	(15)	(18)
Total Duke Energy Corporation stockholders' equity	16,218	15,590
Noncontrolling interests	3	3
Total equity	16,221	15,593
Total Liabilities and Equity	58,103	57,694
Duke Energy Progress
Current Assets
Cash and cash equivalents	51	22
Receivables (net of allowance for doubtful accounts)	77	123
Receivables of VIEs (net of allowance for doubtful accounts)	451	489
Receivables from affiliated companies	42	52
Inventory	980	934
Regulatory assets (includes amounts related to VIEs)	526	526
Other (includes amounts related to VIEs)	37	60
Total current assets	2,164	2,206
Property, Plant and Equipment
Cost	35,120	34,603
Accumulated depreciation and amortization	(12,303)	(11,915)
Generation facilities to be retired, net	28	246
Net property, plant and equipment	22,845	22,934
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	4,448	4,152
Nuclear decommissioning trust funds	3,023	3,047
Operating lease right-of-use assets, net	367	387
Other (includes amounts related to VIEs)	688	651
Total other noncurrent assets	8,526	8,237
Total Assets	33,535	33,377
Current Liabilities
Accounts payable	287	629
Accounts payable to affiliated companies	153	203
Notes payable to affiliated companies	257	66
Taxes accrued	88	17
Interest accrued	102	110
Current maturities of long-term debt (includes amounts related to VIEs)	1,006	1,006
Asset retirement obligations	357	485
Regulatory liabilities	306	236
Other	468	478
Total current liabilities	3,024	3,230
Long-Term Debt (includes amounts related to VIEs)	7,907	7,902
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	2,485	2,388
Asset retirement obligations	5,457	5,408
Regulatory liabilities	4,087	4,232
Operating lease liabilities	339	354
Accrued pension and other post-retirement benefit costs	237	238
Investment tax credits	134	137
Other (includes amounts related to VIEs)	105	92
Total other noncurrent liabilities	12,844	12,849
Equity
Total member's equity	9,610	9,246
Total Liabilities and Equity	33,535	33,377
Duke Energy Florida
Current Assets
Cash and cash equivalents	20	17
Receivables (net of allowance for doubtful accounts)	72	96
Receivables of VIEs (net of allowance for doubtful accounts)	469	341
Receivables from affiliated companies	2
Notes receivable from affiliated companies		173
Inventory	486	489
Regulatory assets (includes amounts related to VIEs)	432	419
Other (includes amounts related to VIEs)	44	58
Total current assets	1,525	1,593
Property, Plant and Equipment
Cost	21,290	20,457
Accumulated depreciation and amortization	(5,394)	(5,236)
Net property, plant and equipment	15,896	15,221
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,860	2,194
Nuclear decommissioning trust funds	711	734
Operating lease right-of-use assets, net	370	401
Other (includes amounts related to VIEs)	327	311
Total other noncurrent assets	3,268	3,640
Total Assets	20,689	20,454
Current Liabilities
Accounts payable	388	474
Accounts payable to affiliated companies	80	131
Notes payable to affiliated companies	232
Taxes accrued	177	43
Interest accrued	67	75
Current maturities of long-term debt (includes amounts related to VIEs)	323	571
Regulatory liabilities	82	94
Other	372	415
Total current liabilities	1,721	1,803
Long-Term Debt (includes amounts related to VIEs)	7,628	7,416
Other Noncurrent Liabilities
Deferred income taxes	2,181	2,179
Asset retirement obligations	581	578
Regulatory liabilities	726	993
Operating lease liabilities	323	343
Accrued pension and other post-retirement benefit costs	211	218
Other (includes amounts related to VIEs)	194	136
Total other noncurrent liabilities	4,216	4,447
Equity
Member's equity	7,125	6,789
Accumulated other comprehensive loss	(1)	(1)
Total member's equity	7,124	6,788
Total Liabilities and Equity	20,689	20,454
Duke Energy Ohio
Current Assets
Cash and cash equivalents	8	17
Receivables (net of allowance for doubtful accounts)	83	84
Receivables from affiliated companies	47	92
Notes receivable from affiliated companies	35
Inventory	129	135
Regulatory assets (includes amounts related to VIEs)	32	49
Other (includes amounts related to VIEs)	14	21
Total current assets	348	398
Property, Plant and Equipment
Cost	10,591	10,241
Accumulated depreciation and amortization	(2,923)	(2,843)
Net property, plant and equipment	7,668	7,398
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets (includes amounts related to VIEs)	593	549
Operating lease right-of-use assets, net	21	21
Other (includes amounts related to VIEs)	59	52
Total other noncurrent assets	1,593	1,542
Total Assets	9,609	9,338
Current Liabilities
Accounts payable	249	288
Accounts payable to affiliated companies	58	68
Notes payable to affiliated companies	79	312
Taxes accrued	210	219
Interest accrued	31	30
Asset retirement obligations	5	1
Regulatory liabilities	69	64
Other	71	75
Total current liabilities	772	1,057
Long-Term Debt (includes amounts related to VIEs)	2,994	2,594
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	958	922
Asset retirement obligations	77	79
Regulatory liabilities	751	763
Operating lease liabilities	20	21
Accrued pension and other post-retirement benefit costs	102	100
Other (includes amounts related to VIEs)	96	94
Total other noncurrent liabilities	2,004	1,979
Equity
Common stock	762	762
Additional paid-in capital	2,776	2,776
Retained earnings	276	145
Total Duke Energy Corporation stockholders' equity	3,814	3,683
Total Liabilities and Equity	9,609	9,338
Duke Energy Indiana
Current Assets
Cash and cash equivalents	16	25
Receivables (net of allowance for doubtful accounts)	44	60
Receivables from affiliated companies	59	79
Notes receivable from affiliated companies	425
Inventory	489	517
Regulatory assets (includes amounts related to VIEs)	90	90
Other (includes amounts related to VIEs)	45	60
Total current assets	1,168	831
Property, Plant and Equipment
Cost	16,736	16,305
Accumulated depreciation and amortization	(5,472)	(5,233)
Net property, plant and equipment	11,264	11,072
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,113	1,082
Operating lease right-of-use assets, net	56	57
Other (includes amounts related to VIEs)	251	234
Total other noncurrent assets	1,420	1,373
Total Assets	13,852	13,276
Current Liabilities
Accounts payable	204	201
Accounts payable to affiliated companies	74	87
Notes payable to affiliated companies		30
Taxes accrued	46	49
Interest accrued	64	58
Current maturities of long-term debt (includes amounts related to VIEs)	503	503
Asset retirement obligations	172	189
Regulatory liabilities	51	55
Other	104	112
Total current liabilities	1,218	1,284
Long-Term Debt (includes amounts related to VIEs)	3,950	3,404
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	1,195	1,150
Asset retirement obligations	643	643
Regulatory liabilities	1,655	1,685
Operating lease liabilities	54	55
Accrued pension and other post-retirement benefit costs	150	148
Investment tax credits	170	164
Other (includes amounts related to VIEs)	12	18
Total other noncurrent liabilities	3,879	3,863
Equity
Total member's equity	4,655	4,575
Total Liabilities and Equity	13,852	13,276
Piedmont Natural Gas
Current Assets
Receivables (net of allowance for doubtful accounts)	102	241
Receivables from affiliated companies	14	10
Inventory	29	72
Regulatory assets (includes amounts related to VIEs)	118	73
Other (includes amounts related to VIEs)	54	28
Total current assets	317	424
Property, Plant and Equipment
Cost	8,701	8,446
Accumulated depreciation and amortization	(1,715)	(1,681)
Net property, plant and equipment	6,986	6,765
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets (includes amounts related to VIEs)	280	290
Operating lease right-of-use assets, net	22	24
Investments in equity method unconsolidated affiliates	85	83
Other (includes amounts related to VIEs)	278	121
Total other noncurrent assets	714	567
Total Assets	8,017	7,756
Current Liabilities
Accounts payable	138	215
Accounts payable to affiliated companies	36	3
Notes payable to affiliated companies	200	476
Taxes accrued	28	24
Interest accrued	34	33
Current maturities of long-term debt (includes amounts related to VIEs)	160
Regulatory liabilities	97	81
Other	56	67
Total current liabilities	749	899
Long-Term Debt (includes amounts related to VIEs)	2,619	2,384
Other Noncurrent Liabilities
Deferred income taxes	763	708
Asset retirement obligations	17	17
Regulatory liabilities	1,078	1,131
Operating lease liabilities	21	23
Accrued pension and other post-retirement benefit costs	7	3
Other (includes amounts related to VIEs)	141	148
Total other noncurrent liabilities	2,027	2,030
Equity
Common stock	1,310	1,310
Retained earnings	1,312	1,133
Total Duke Energy Corporation stockholders' equity	2,622	2,443
Total Liabilities and Equity	8,017	7,756
Preferred stock, Series A
Equity
Preferred stock	973	973
Preferred stock, Series B
Equity
Preferred stock	$ 989	$ 989

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts - receivables	$ 23	$ 22
Regulatory Assets: Current	1,774	1,796
Current Assets: Other	1,031	764
Other Noncurrent Assets: Regulatory assets	13,285	13,222
Other, noncurrent assets	3,458	3,289
Current maturities of long-term debt	3,756	3,141
Long-Term Debt	$ 56,143	$ 54,985
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	735,000,000	733,000,000
Other, noncurrent liabilities	$ 1,563	$ 1,581
Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	79	54
Regulatory Assets: Current	53	52
Current Assets: Other	260	242
Other Noncurrent Assets: Regulatory assets	969	989
Other, noncurrent assets	85	110
Current maturities of long-term debt	462	216
Long-Term Debt	3,643	3,997
Other, noncurrent liabilities	251	228
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	1	3
Regulatory Assets: Current	490	550
Current Assets: Other	19	21
Other Noncurrent Assets: Regulatory assets	3,440	3,360
Other, noncurrent assets	1,158	1,149
Current maturities of long-term debt	508	458
Long-Term Debt	11,713	11,142
Other, noncurrent liabilities	611	627
Duke Energy Carolinas | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	13	7
Progress Energy
Allowance for doubtful accounts - receivables	9	7
Regulatory Assets: Current	957	946
Current Assets: Other	145	210
Other Noncurrent Assets: Regulatory assets	6,308	6,346
Other, noncurrent assets	1,164	1,049
Current maturities of long-term debt	1,829	1,577
Long-Term Debt	$ 17,625	$ 17,907
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 449	$ 383
Progress Energy | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	20	9
Regulatory Assets: Current	53	52
Current Assets: Other	32	39
Other Noncurrent Assets: Regulatory assets	969	989
Current maturities of long-term debt	304	54
Long-Term Debt	1,361	1,632
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	3
Regulatory Assets: Current	526	526
Current Assets: Other	37	60
Other Noncurrent Assets: Regulatory assets	4,448	4,152
Other, noncurrent assets	688	651
Current maturities of long-term debt	1,006	1,006
Long-Term Debt	7,907	7,902
Other, noncurrent liabilities	105	92
Duke Energy Progress | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	10	5
Duke Energy Florida
Allowance for doubtful accounts - receivables	5	3
Regulatory Assets: Current	432	419
Current Assets: Other	44	58
Other Noncurrent Assets: Regulatory assets	1,860	2,194
Other, noncurrent assets	327	311
Current maturities of long-term debt	323	571
Long-Term Debt	7,628	7,416
Other, noncurrent liabilities	194	136
Duke Energy Florida | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	9	4
Regulatory Assets: Current	53	52
Current Assets: Other	32	39
Other Noncurrent Assets: Regulatory assets	969	989
Current maturities of long-term debt	304	54
Long-Term Debt	1,028	1,307
Duke Energy Ohio
Allowance for doubtful accounts - receivables	5	4
Regulatory Assets: Current	32	49
Current Assets: Other	14	21
Other Noncurrent Assets: Regulatory assets	593	549
Other, noncurrent assets	59	52
Long-Term Debt	$ 2,994	$ 2,594
Common stock, par value (in usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	90,000,000	90,000,000
Other, noncurrent liabilities	$ 96	$ 94
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3	3
Regulatory Assets: Current	90	90
Current Assets: Other	45	60
Other Noncurrent Assets: Regulatory assets	1,113	1,082
Other, noncurrent assets	251	234
Current maturities of long-term debt	503	503
Long-Term Debt	3,950	3,404
Other, noncurrent liabilities	12	18
Piedmont Natural Gas
Allowance for doubtful accounts - receivables	6	6
Regulatory Assets: Current	118	73
Current Assets: Other	54	28
Other Noncurrent Assets: Regulatory assets	280	290
Other, noncurrent assets	278	121
Current maturities of long-term debt	160
Long-Term Debt	$ 2,619	$ 2,384
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 141	$ 148
Preferred stock, Series A
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	40,000,000	40,000,000
Preferred stock, depositary shares outstanding	40,000,000	40,000,000
Preferred stock, Series B
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	1,000,000	1,000,000
Preferred stock, depositary shares outstanding	1,000,000	1,000,000

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (2)	$ 1,641
Net income (loss) (attributable to parent)	136	1,732
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,651	2,483
Equity in losses (earnings) of unconsolidated affiliates	1,924	(87)
Equity component of AFUDC	(76)	(67)
(Gains) losses on sales of other assets	(8)
Impairment charges	8	4
Deferred income taxes	105	527
Payments for asset retirement obligations	(287)	(336)
Provision for rate refunds	(12)	57
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(24)	(11)
Receivables	281	304
Inventory	(56)	(110)
Other current assets	(124)	(265)
Increase (decrease) in
Accounts payable	(638)	(700)
Taxes accrued	273	(56)
Other current liabilities	(344)	(378)
Other assets	(193)	(1)
Other liabilities	(121)	51
Net cash provided by operating activities	3,357	3,056
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(5,103)	(5,465)
Contributions to equity method investments	(164)	(162)
Purchases of debt and equity securities	(3,818)	(2,316)
Proceeds from sales and maturities of debt and equity securities	3,755	2,302
Other	(141)	(147)
Net cash used in investing activities	(5,471)	(5,788)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,788	4,622
Proceeds from the issuance of preferred stock		973
Proceeds from the issuance of common stock	57	27
Payments for the redemption of long-term debt	(1,951)	(2,155)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	1,866	240
Payments for the redemption of short-term debt with original maturities greater than 90 days	(113)	(299)
Notes payable and commercial paper	(129)	383
Contributions from noncontrolling interests	163	193
Dividends paid	(1,391)	(1,312)
Other	(108)	(50)
Net cash provided by financing activities	2,182	2,622
Net increase (decrease) in cash, cash equivalents and restricted cash	68	(110)
Cash, cash equivalents and restricted cash at beginning of period	573	591
Cash, cash equivalents and restricted cash at end of period	641	481
Significant non-cash transactions:
Accrued capital expenditures	945	917
Non-cash dividends	54	54
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	573	594
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	854	804
Equity component of AFUDC	(29)	(21)
Impairment charges	2	5
Deferred income taxes	31	54
Payments for asset retirement obligations	(86)	(131)
Provision for rate refunds	2	35
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(8)
Receivables	40	83
Receivables from affiliated companies	36	81
Inventory	(84)	(77)
Other current assets	170	(133)
Increase (decrease) in
Accounts payable	(249)	(282)
Accounts payable to affiliated companies	(63)	(41)
Taxes accrued	120	38
Other current liabilities	(134)	(71)
Other assets	(83)	87
Other liabilities	(35)	(18)
Net cash provided by operating activities	1,065	999
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,271)	(1,357)
Purchases of debt and equity securities	(1,017)	(1,114)
Proceeds from sales and maturities of debt and equity securities	1,017	1,114
Other	(73)	(46)
Net cash used in investing activities	(1,344)	(1,403)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	938	25
Payments for the redemption of long-term debt	(454)	(3)
Notes payable to affiliated companies	102	365
Distributions to parent	(300)
Other	(1)	(1)
Net cash provided by financing activities	285	386
Net increase (decrease) in cash, cash equivalents and restricted cash	6	(18)
Cash, cash equivalents and restricted cash at beginning of period	18	33
Cash, cash equivalents and restricted cash at end of period	24	15
Significant non-cash transactions:
Accrued capital expenditures	256	252
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	627	577
Net income (loss) (attributable to parent)	627	577
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,118	1,061
Equity component of AFUDC	(24)	(31)
(Gains) losses on sales of other assets	(6)	1
Deferred income taxes	94	126
Payments for asset retirement obligations	(173)	(183)
Provision for rate refunds	2	10
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(22)	(1)
Receivables	(15)	(42)
Receivables from affiliated companies	34	119
Inventory	(42)	(26)
Other current assets	102	114
Increase (decrease) in
Accounts payable	(238)	(196)
Accounts payable to affiliated companies	(88)	(125)
Taxes accrued	155	82
Other current liabilities	(64)	(162)
Other assets	(51)	(82)
Other liabilities	(97)	24
Net cash provided by operating activities	1,312	1,266
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,812)	(1,988)
Purchases of debt and equity securities	(2,602)	(1,094)
Proceeds from sales and maturities of debt and equity securities	2,588	1,089
Notes receivable from affiliated companies	164
Other	(81)	(59)
Net cash used in investing activities	(1,743)	(2,052)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	514	1,295
Payments for the redemption of long-term debt	(550)	(1,188)
Notes payable to affiliated companies	552	685
Other		2
Net cash provided by financing activities	516	794
Net increase (decrease) in cash, cash equivalents and restricted cash	85	8
Cash, cash equivalents and restricted cash at beginning of period	126	112
Cash, cash equivalents and restricted cash at end of period	211	120
Significant non-cash transactions:
Accrued capital expenditures	287	278
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	365	372
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	635	634
Equity component of AFUDC	(19)	(28)
(Gains) losses on sales of other assets	(6)
Deferred income taxes	60	26
Payments for asset retirement obligations	(164)	(166)
Provision for rate refunds	2	10
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(5)	(5)
Receivables	96	58
Receivables from affiliated companies	10	(17)
Inventory	(46)	(26)
Other current assets	87	115
Increase (decrease) in
Accounts payable	(260)	(223)
Accounts payable to affiliated companies	(50)	(96)
Taxes accrued	71	53
Other current liabilities	(16)	(74)
Other assets	(86)	(3)
Other liabilities	(5)	25
Net cash provided by operating activities	669	655
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(795)	(1,115)
Purchases of debt and equity securities	(569)	(473)
Proceeds from sales and maturities of debt and equity securities	548	458
Other	(21)	(20)
Net cash used in investing activities	(837)	(1,150)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	20	1,270
Payments for the redemption of long-term debt	(13)	(602)
Notes payable to affiliated companies	191	(167)
Other	(1)	(1)
Net cash provided by financing activities	197	500
Net increase (decrease) in cash, cash equivalents and restricted cash	29	5
Cash, cash equivalents and restricted cash at beginning of period	22	23
Cash, cash equivalents and restricted cash at end of period	51	28
Significant non-cash transactions:
Accrued capital expenditures	95	112
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	336	297
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	478	423
Equity component of AFUDC	(6)	(2)
(Gains) losses on sales of other assets		1
Deferred income taxes	37	82
Payments for asset retirement obligations	(9)	(17)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(20)	2
Receivables	(110)	(101)
Receivables from affiliated companies	(2)	10
Inventory	4	1
Other current assets	(11)	8
Increase (decrease) in
Accounts payable	23	27
Accounts payable to affiliated companies	(51)	(29)
Taxes accrued	134	74
Other current liabilities	(50)	(80)
Other assets	37	(77)
Other liabilities	(91)	(8)
Net cash provided by operating activities	699	611
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,016)	(873)
Purchases of debt and equity securities	(2,033)	(621)
Proceeds from sales and maturities of debt and equity securities	2,040	631
Notes receivable from affiliated companies	173
Other	(60)	(37)
Net cash used in investing activities	(896)	(900)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	25
Payments for the redemption of long-term debt	(537)	(136)
Notes payable to affiliated companies	232	369
Other	2	3
Net cash provided by financing activities	192	261
Net increase (decrease) in cash, cash equivalents and restricted cash	(5)	(28)
Cash, cash equivalents and restricted cash at beginning of period	56	75
Cash, cash equivalents and restricted cash at end of period	51	47
Significant non-cash transactions:
Accrued capital expenditures	192	166
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	131	116
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	138	132
Equity component of AFUDC	(2)	(7)
Deferred income taxes	24	45
Payments for asset retirement obligations		(5)
Provision for rate refunds	6	3
(Increase) decrease in
Receivables	2	24
Receivables from affiliated companies	45	64
Inventory	6	2
Other current assets	8	(13)
Increase (decrease) in
Accounts payable	(22)	(44)
Accounts payable to affiliated companies	(10)
Taxes accrued	(9)	(67)
Other current liabilities	2	2
Other assets	(24)	(18)
Other liabilities	(3)	(15)
Net cash provided by operating activities	292	219
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(403)	(473)
Notes receivable from affiliated companies	(35)
Other	(27)	(31)
Net cash used in investing activities	(465)	(504)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	397	794
Payments for the redemption of long-term debt		(451)
Notes payable to affiliated companies	(233)	(71)
Net cash provided by financing activities	164	272
Net increase (decrease) in cash, cash equivalents and restricted cash	(9)	(13)
Cash, cash equivalents and restricted cash at beginning of period	17	21
Cash, cash equivalents and restricted cash at end of period	8	8
Significant non-cash transactions:
Accrued capital expenditures	94	93
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	180	207
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	267	265
Equity component of AFUDC	(12)	(9)
Deferred income taxes	38	60
Payments for asset retirement obligations	(28)	(17)
(Increase) decrease in
Receivables	19	5
Receivables from affiliated companies	20	39
Inventory	28	(41)
Other current assets	13	48
Increase (decrease) in
Accounts payable	22	26
Accounts payable to affiliated companies	(13)	(17)
Taxes accrued	4	(18)
Other current liabilities	(22)	(13)
Other assets	(29)	(33)
Other liabilities	(6)	15
Net cash provided by operating activities	481	517
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(456)	(443)
Purchases of debt and equity securities	(14)	(14)
Proceeds from sales and maturities of debt and equity securities	7	11
Notes receivable from affiliated companies	(425)
Other	(16)	(21)
Net cash used in investing activities	(904)	(467)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	544
Payments for the redemption of long-term debt		(60)
Notes payable to affiliated companies	(30)	(2)
Distributions to parent	(100)
Net cash provided by financing activities	414	(62)
Net increase (decrease) in cash, cash equivalents and restricted cash	(9)	(12)
Cash, cash equivalents and restricted cash at beginning of period	25	24
Cash, cash equivalents and restricted cash at end of period	16	12
Significant non-cash transactions:
Accrued capital expenditures	83	84
Piedmont Natural Gas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	180	115
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	89	85
Equity in losses (earnings) of unconsolidated affiliates	(4)	(4)
Equity component of AFUDC	(9)
Deferred income taxes	17	40
Provision for rate refunds	(24)	9
(Increase) decrease in
Receivables	154	168
Receivables from affiliated companies	(4)	5
Inventory	42	37
Other current assets	(69)	(17)
Increase (decrease) in
Accounts payable	(68)	(70)
Accounts payable to affiliated companies	33	14
Taxes accrued	5	(61)
Other current liabilities	(4)	10
Other assets	(13)	(9)
Other liabilities	7	(2)
Net cash provided by operating activities	332	320
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(438)	(480)
Contributions to equity method investments		(16)
Notes receivable from affiliated companies		(16)
Other	(11)	(6)
Net cash used in investing activities	(449)	(518)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	394	596
Payments for the redemption of long-term debt		(350)
Notes payable to affiliated companies	(277)	(198)
Capital contributions from parent		150
Net cash provided by financing activities	117	198
Significant non-cash transactions:
Accrued capital expenditures	$ 98	$ 115

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stockholders' Equity		Common Stock	Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities		Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Noncontrolling Interests		Duke Energy Carolinas		Duke Energy CarolinasMember's Equity		Duke Energy CarolinasAccumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Progress Energy		Progress EnergyCommon Stockholders' Equity	Progress EnergyAdditional Paid-in Capital	Progress EnergyRetained Earnings		Progress EnergyAccumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Progress EnergyAccumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Progress EnergyAccumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Progress EnergyNoncontrolling Interests		Duke Energy Progress	Duke Energy ProgressMember's Equity	Duke Energy Florida	Duke Energy FloridaMember's Equity	Duke Energy FloridaAccumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Duke Energy Ohio	Duke Energy OhioCommon Stock	Duke Energy OhioAdditional Paid-in Capital	Duke Energy OhioRetained Earnings	Duke Energy Indiana	Duke Energy IndianaMember's Equity	Piedmont Natural Gas	Piedmont Natural GasCommon Stock	Piedmont Natural GasRetained Earnings	Preferred stock, Series A		Preferred stock, Series APreferred Stock		Preferred stock, Series ACommon Stockholders' Equity	[2]	Preferred stock, Series B	Common Stock	Common StockCommon Stockholders' Equity	Common StockCommon Stock	Common StockAdditional Paid-in Capital	Preferred Stock	Preferred StockPreferred Stock	Preferred StockCommon Stockholders' Equity
Beginning Balance at Dec. 31, 2018		$ 43,834			$ 43,817		$ 1	$ 40,795		$ 3,113		$ (14)		$ (3)		$ (75)		$ 17							$ 14,257		$ 14,254	$ 9,143	$ 5,131		$ (12)		$ (1)	$ (7)		$ 3
Beginning Balance, in shares at Dec. 31, 2018							727,000,000
Beginning Balance (member's equity) at Dec. 31, 2018																				$ 11,683		$ 11,689		$ (6)															$ 8,441	$ 6,095	$ 6,097	$ (2)						$ 4,339
Beginning Balance (parent) at Dec. 31, 2018																																											$ 3,445	$ 762	$ 2,776	$ (93)			$ 2,091	$ 1,160	$ 931
Net income (loss) (attributable to parent)		1,732																		594		594			577													$ 372	372	297	297		116			116	$ 207	207	115		115
Net (loss) income		1,641																							577		577		577
Net income		1,629			1,720					1,720								(91)
Other comprehensive income (loss)		(32)	[1]		(32)							(43)		8		3									6		6				3		1	2						1		1
Stock issuances																																																				$ 973	[2]	$ 973	[2]	$ 973			$ 89	$ 89		$ 89
Stock issuances, in shares																																																						40,000,000							1,000,000
Common stock dividends		(1,354)			(1,354)					(1,354)
Contribution from noncontrolling interest in subsidiaries	[3]	193																193
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from parent																																																	150	150
Other		1	[4]					1	[4]	23	[4]	(6)	[4]	(1)	[4]	(17)	[4]	1	[4]	(1)				(1)	(1)	[5]			7	[5]	(4)	[5]		(3)	[5]	(1)	[5]
Ending Balance at Jun. 30, 2019		45,332		$ 973	45,213		$ 1	40,885		3,502		(63)		4		(89)		119							14,839		14,837	9,143	5,715		(13)			(8)		2
Ending Balance, in shares at Jun. 30, 2019							728,000,000
Ending Balance (member's equity) at Jun. 30, 2019																				12,276		12,283		(7)															8,813	6,393	6,394	(1)						4,546
Ending Balance (parent) at Jun. 30, 2019																																											3,561	762	2,776	23			2,356	1,310	1,046
Beginning Balance at Mar. 31, 2019		45,045		974	45,030		$ 1	40,823		3,360		(36)				(92)		15							14,508		14,506	9,143	5,386		(14)		(1)	(8)		2
Beginning Balance, in shares at Mar. 31, 2019							728,000,000
Beginning Balance (member's equity) at Mar. 31, 2019																				11,975		11,982		(7)															8,644	6,192	6,193	(1)						4,449
Beginning Balance (parent) at Mar. 31, 2019																																											3,514	762	2,776	(24)			2,213	1,160	1,053
Net income (loss) (attributable to parent)		832																		301		301			328													169	169	201	201		47			47	97	97	(7)		(7)
Net (loss) income		748																							329		328		328							1
Net income		736			820					820								(84)
Other comprehensive income (loss)		(20)	[1]		(20)							(27)		4		3									3		3				1		1	1
Stock issuances																																																											61	61		61	$ (1)	$ (1)	$ (1)
Common stock dividends		(678)			(678)					(678)
Contribution from noncontrolling interest in subsidiaries	[3]	193																193
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from parent																																																	150	150
Other		(3)			1			1										(4)							(1)				1					(1)		(1)
Ending Balance at Jun. 30, 2019		45,332		973	45,213		$ 1	40,885		3,502		(63)		4		(89)		119							14,839		14,837	9,143	5,715		(13)			(8)		2
Ending Balance, in shares at Jun. 30, 2019							728,000,000
Ending Balance (member's equity) at Jun. 30, 2019																				12,276		12,283		(7)															8,813	6,393	6,394	(1)						4,546
Ending Balance (parent) at Jun. 30, 2019																																											$ 3,561	762	2,776	23			$ 2,356	1,310	1,046
Beginning Balance at Dec. 31, 2019		$ 47,951		1,962	46,822		$ 1	40,881		4,108		(51)		3		(82)		1,129							$ 15,593		15,590	9,143	6,465		(10)		(1)	(7)		3
Beginning Balance, in shares at Dec. 31, 2019		733,000,000					733,000,000																		100																		90,000,000						100
Beginning Balance, in shares at Dec. 31, 2019																																																				40,000,000						1,000,000
Beginning Balance (member's equity) at Dec. 31, 2019																				12,811		12,818		(7)														9,246	9,246	6,788	6,789	(1)					4,575	4,575
Beginning Balance (parent) at Dec. 31, 2019		$ 46,822																							$ 15,590																		$ 3,683	762	2,776	145			$ 2,443	1,310	1,133
Net income (loss) (attributable to parent)		136																		573		573			627													365	365	336	336		$ 131			131	180	180	180		180
Net (loss) income		(2)																							627		627		627
Net income		(56)			82					82								(138)
Other comprehensive income (loss)		(65)	[1]		(53)							(60)		7				(12)							3		3				2			1
Stock issuances																																																											116	116		116
Stock issuances, in shares																																																													2,000,000
Common stock dividends		(1,391)			(1,391)					(1,391)										(300)		(300)																										(100)
Contribution from noncontrolling interest in subsidiaries		163																163
Distributions to noncontrolling interest in subsidiaries		(14)																(14)							(1)											(1)
Other		(93)	[6]		(92)	[6]				(92)	[6]							(1)	[6]	(12)	[7]	(12)	[7]		(1)		(2)		(2)							1			(1)										$ (1)		(1)
Ending Balance at Jun. 30, 2020		$ 46,611		1,962	45,484		$ 1	40,997		2,707		(111)		10		(82)		1,127							$ 16,221		16,218	9,143	7,090		(8)		(1)	(6)		3
Ending Balance, in shares at Jun. 30, 2020																																																				40,000,000						1,000,000
Ending Balance, in shares at Jun. 30, 2020		735,000,000					735,000,000																		100																		90,000,000						100
Ending Balance (member's equity) at Jun. 30, 2020																				13,072		13,079		(7)														9,610	9,610	7,124	7,125	(1)					4,655	4,655
Ending Balance (parent) at Jun. 30, 2020		$ 45,484																							$ 16,218																		$ 3,814	762	2,776	276			$ 2,622	1,310	1,312
Beginning Balance at Mar. 31, 2020		48,083		1,962	46,921		$ 1	40,930		4,221		(116)		4		(81)		1,162							15,877		15,874	9,143	6,747		(9)			(7)		3
Beginning Balance, in shares at Mar. 31, 2020							735,000,000
Beginning Balance (member's equity) at Mar. 31, 2020																				12,837		12,844		(7)															9,450	6,909	6,909							4,674
Beginning Balance (parent) at Mar. 31, 2020																																											3,748	762	2,776	210			2,620	1,310	1,310
Net income (loss) (attributable to parent)		(802)																		234		234			344													161	161	216	216		$ 66			66	81	81	$ 2		2
Net (loss) income		(892)																							344		344		344
Net income		(907)			(817)					(817)								(90)
Other comprehensive income (loss)		12	[1]		10							5		6		(1)		2							1		1				1		(1)	1						(1)		(1)
Stock issuances																																																											$ 66	$ 66		$ 66
Common stock dividends		(696)			(696)					(696)																																						(100)
Contribution from noncontrolling interest in subsidiaries	[3]	60																60
Distributions to noncontrolling interest in subsidiaries		(7)																(7)							(1)											(1)
Other		0						1		(1)										1		1					(1)		(1)							1			(1)
Ending Balance at Jun. 30, 2020		$ 46,611		$ 1,962	$ 45,484		$ 1	$ 40,997		$ 2,707		$ (111)		$ 10		$ (82)		$ 1,127							$ 16,221		$ 16,218	$ 9,143	$ 7,090		$ (8)		$ (1)	$ (6)		$ 3
Ending Balance, in shares at Jun. 30, 2020																																																				40,000,000						1,000,000
Ending Balance, in shares at Jun. 30, 2020		735,000,000					735,000,000																		100																		90,000,000						100
Ending Balance (member's equity) at Jun. 30, 2020																				$ 13,072		$ 13,079		$ (7)														$ 9,610	$ 9,610	$ 7,124	$ 7,125	$ (1)					$ 4,655	$ 4,655
Ending Balance (parent) at Jun. 30, 2020		$ 45,484																							$ 16,218																		$ 3,814	$ 762	$ 2,776	$ 276			$ 2,622	$ 1,310	$ 1,312
[1]	Net of income tax impacts of approximately $20 million and $10 million for the six months ended June 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.
[2]	Duke Energy issued 40 million depositary shares of preferred stock, Series A.
[3]	Relates to tax equity financing activity in the Commercial Renewables segment.
[4]	Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[5]	Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[6]	Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.
[7]	Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity (Parenthetical)	6 Months Ended
	Jun. 30, 2019shares
Preferred stock, Series A | Preferred Stock
Stock issuances, in shares	40,000,000

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Index to Combined Notes to Condensed Consolidated Financial Statements The unaudited notes to the Condensed Consolidated Financial Statements that follow are a combined presentation. The following list indicates the registrants to which the footnotes apply. Applicable Notes Registrant 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Duke Energy • • • • • • • • • • • • • • • Duke Energy Carolinas • • • • • • • • • • • • • • Progress Energy • • • • • • • • • • • • • • • Duke Energy Progress • • • • • • • • • • • • • • Duke Energy Florida • • • • • • • • • • • • • • Duke Energy Ohio • • • • • • • • • • • • • • Duke Energy Indiana • • • • • • • • • • • • • • Piedmont • • • • • • • • • • • • • Tables within the notes may not sum across due to (i) Progress Energy's consolidation of Duke Energy Progress, Duke Energy Florida and other subsidiaries that are not registrants and (ii) subsidiaries that are not registrants but included in the consolidated Duke Energy balances. BASIS OF PRESENTATION These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2019 . The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. These Condensed Consolidated Financial Statements, in the opinion of the respective companies’ management, reflect all normal recurring adjustments necessary to fairly present the financial position and results of operations of each of the Duke Energy Registrants. Amounts reported in Duke Energy’s interim Condensed Consolidated Statements of Operations and each of the Subsidiary Registrants’ interim Condensed Consolidated Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to effects of seasonal temperature variations on energy consumption, regulatory rulings, timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. BASIS OF CONSOLIDATION These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 11 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. COVID-19 The COVID-19 pandemic is having a significant impact on global health and economic environments. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and President Trump proclaimed that the COVID-19 outbreak in the United States constitutes a national emergency. The extent to which the COVID-19 pandemic will impact the Duke Energy Registrants during 2020 and beyond is uncertain, and the Duke Energy Registrants are monitoring developments closely. The company incurred approximately $34 million and $40 million of incremental COVID-19 costs for the three and six months ended June 30, 2020 , respectively, included in Operation, maintenance and other on the Condensed Consolidated Statements of Operations. These costs were primarily bad debt expense, personal protective equipment and cleaning supplies. Further the company experienced approximately another $25 million of waived late payment fees for the three and six months ended June 30, 2020 . See Notes 3 , 5 , 11 , 12 and 15 for additional information as well as steps taken to mitigate the impacts to our business and customers from the COVID-19 pandemic. OTHER CURRENT ASSETS Included in Other within Current Assets on the Piedmont Condensed Consolidated Balance Sheets are income taxes receivable of $22 million and $14 million as of June 30, 2020, and December 31, 2019, respectively, and prepaid assets of $19 million and $3 million as of June 30, 2020, and December 31, 2019, respectively. The income taxes receivable relates to increases of net operating losses for Piedmont and intercompany tax settlements. The prepaid assets relate to natural gas storage injections and inventory transfers classified as prepaid assets until winter season when the gas is moved to Inventory on the Piedmont Condensed Consolidated Balance Sheets under certain agreements. OTHER CURRENT LIABILITIES During the second quarter of 2020, Duke Energy recorded a current liability related to the abandonment of ACP within Current Liabilities in the Gas Utilities and Infrastructure segment. The liability represents Duke Energy's obligation to fund ACP's obligations of outstanding debt and satisfy ARO requirements to restore construction sites. As a result, Liabilities associated with unconsolidated affiliates is $920 million , and exceeds 5% of Total current liabilities on the Duke Energy Condensed Consolidated Balance Sheets as of June 30, 2020 . See Notes 3 , 4 and 11 for further information. NONCONTROLLING INTEREST Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Condensed Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the Hypothetical Liquidation at Book Value (HLBV) method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period. The following table presents cash received for the sale of noncontrolling interest to tax equity members and allocated losses to noncontrolling tax equity members utilizing the HLBV method for the three and six months ended June 30, 2020 , and 2019 . Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Cash received for the sale of noncontrolling interest to tax equity members $ 60 $ 187 $ 163 $ 193 Allocated losses to noncontrolling tax equity members utilizing the HLBV method 79 83 128 90 Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares . CASH, CASH EQUIVALENTS AND RESTRICTED CASH Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 9 and 11 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 Duke Duke Duke Progress Energy Duke Progress Energy Energy Energy Florida Energy Energy Florida Current Assets Cash and cash equivalents $ 341 $ 78 $ 20 $ 311 $ 48 $ 17 Other 193 31 31 222 39 39 Other Noncurrent Assets Other 107 102 — 40 39 — Total cash, cash equivalents and restricted cash $ 641 $ 211 $ 51 $ 573 $ 126 $ 56 INVENTORY Provisions for inventory write-offs were not material at June 30, 2020 , and December 31, 2019 . The components of inventory are presented in the tables below. June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,220 $ 769 $ 1,014 $ 682 $ 333 $ 83 $ 254 $ 5 Coal 776 271 257 189 68 13 234 — Natural gas, oil and other fuel 293 40 195 109 85 33 1 24 Total inventory $ 3,289 $ 1,080 $ 1,466 $ 980 $ 486 $ 129 $ 489 $ 29 December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,297 $ 768 $ 1,038 $ 686 $ 351 $ 79 $ 318 $ 5 Coal 586 187 186 138 48 15 198 — Natural gas, oil and other fuel 349 41 199 110 90 41 1 67 Total inventory $ 3,232 $ 996 $ 1,423 $ 934 $ 489 $ 135 $ 517 $ 72 NEW ACCOUNTING STANDARDS The following new accounting standard was adopted by the Duke Energy Registrants in 2020 . Current Expected Credit Losses. In June 2016, the Financial Accounting Standards Board (FASB) issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients. Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables. Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators. Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of new credit loss standard, for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 12 for more information. Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below: January 1, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Florida Piedmont Total pretax impact to Retained Earnings $ 120 $ 16 $ 2 $ 1 $ 1 $ 1 The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of June 30, 2020 . Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates by the end of 2021. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022. Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond 2021 may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond 2021. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.

Business Segments

Business Segments	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS Duke Energy Duke Energy's segment structure includes the following segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables. The Electric Utilities and Infrastructure segment primarily includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. The Gas Utilities and Infrastructure segment includes Piedmont, Duke Energy's natural gas local distribution companies in Ohio and Kentucky, and Duke Energy's natural gas storage and midstream pipeline investments. The Commercial Renewables segment is primarily comprised of nonregulated utility-scale wind and solar generation assets located throughout the U.S. In 2020, Duke Energy evaluated recoverability of a renewable merchant plant located in the Electric Reliability Council of Texas West market due to declining market pricing and declining long-term forecasted energy prices, primarily driven by lower forecasted natural gas prices. Duke Energy determined that the asset was not impaired because the carrying value of $155 million approximates the aggregate estimated future cash flows and therefore further testing was not required. A continued decline in energy market pricing would likely result in a future impairment. Duke Energy retained 51% ownership interest in this facility following the 2019 transaction to sell a minority interest in certain renewable assets. The remainder of Duke Energy’s operations is presented as Other, which is primarily comprised of interest expense on holding company debt, unallocated corporate costs, Duke Energy’s wholly owned captive insurance company, Bison, and Duke Energy's interest in National Methanol Company. Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Three Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 5,026 $ 265 $ 123 $ 5,414 $ 7 $ — $ 5,421 Intersegment revenues 8 24 — 32 19 (51 ) — Total revenues $ 5,034 $ 289 $ 123 $ 5,446 $ 26 $ (51 ) $ 5,421 Segment income (loss) (a) $ 753 $ (1,576 ) $ 90 $ (733 ) $ (84 ) $ — $ (817 ) Less: Noncontrolling interests (c) 90 Add: Preferred stock dividend 15 Net Loss $ (892 ) Segment assets $ 136,724 $ 13,072 $ 6,386 $ 156,182 $ 3,874 $ (7 ) $ 160,049 Three Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 5,467 $ 282 $ 118 $ 5,867 $ 6 $ — $ 5,873 Intersegment revenues 8 24 — 32 19 (51 ) — Total revenues $ 5,475 $ 306 $ 118 $ 5,899 $ 25 $ (51 ) $ 5,873 Segment income (loss) $ 809 $ 40 $ 86 $ 935 $ (115 ) $ — $ 820 Less: Noncontrolling interests (c) 84 Add: Preferred stock dividend 12 Net Income $ 748 Six Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 10,200 $ 905 $ 252 $ 11,357 $ 13 $ — $ 11,370 Intersegment revenues 17 48 — 65 36 (101 ) — Total revenues $ 10,217 $ 953 $ 252 $ 11,422 $ 49 $ (101 ) $ 11,370 Segment income (loss) (a)(b) $ 1,458 $ (1,327 ) $ 147 $ 278 $ (196 ) $ — $ 82 Less: Noncontrolling interests (c) 138 Add: Preferred stock dividend 54 Net Loss $ (2 ) Six Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 10,788 $ 1,014 $ 224 $ 12,026 $ 10 $ — $ 12,036 Intersegment revenues 16 48 — 64 36 (100 ) — Total revenues $ 10,804 $ 1,062 $ 224 $ 12,090 $ 46 $ (100 ) $ 12,036 Segment income (loss) $ 1,559 $ 266 $ 99 $ 1,924 $ (204 ) $ — $ 1,720 Less: Noncontrolling interests (c) 91 Add: Preferred stock dividend 12 Net Income $ 1,641 (a) Gas Utilities and Infrastructure includes $2.0 billion of pretax costs related to the abandonment of its ACP investment recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations. See Notes 1, 3 and Note 11 for additional information. (b) Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to the partial settlement of the Duke Energy Carolina's 2019 North Carolina rate case. See Note 3 for additional information. (c) Includes the allocation of losses to noncontrolling tax equity members. See Note 1 for additional information. Duke Energy Ohio Duke Energy Ohio has two reportable segments, Electric Utilities and Infrastructure and Gas Utilities and Infrastructure. The remainder of Duke Energy Ohio's operations is presented as Other. Three Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 330 $ 93 $ 423 $ — $ — $ 423 Segment income/Net (loss) income $ 44 $ 23 $ 67 $ (1 ) $ — $ 66 Segment assets $ 6,378 $ 3,213 $ 9,591 $ 26 $ (8 ) $ 9,609 Three Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 336 $ 97 $ 433 $ — $ 433 Segment income/Net (loss) income $ 31 $ 17 $ 48 $ (1 ) $ 47 Six Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 676 $ 245 $ 921 $ — $ 921 Segment income/Net (loss) income $ 74 $ 59 $ 133 $ (2 ) $ 131 Six Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 691 $ 273 $ 964 $ — $ 964 Segment income/Net (loss) income $ 67 $ 52 $ 119 $ (3 ) $ 116

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2020
Regulated Operations [Abstract]
Regulatory Matters	REGULATORY MATTERS RATE-RELATED INFORMATION The NCUC, PSCSC, FPSC, IURC, PUCO, TPUC and KPSC approve rates for retail electric and natural gas services within their states. The FERC approves rates for electric sales to wholesale customers served under cost-based rates (excluding Ohio and Indiana), as well as sales of transmission service. The FERC also regulates certification and siting of new interstate natural gas pipeline projects. Duke Energy Carolinas and Duke Energy Progress COVID-19 Filings North Carolina On March 10, 2020, Governor Roy Cooper issued Executive Order No. 116 declaring a state of emergency due to the COVID-19 pandemic. On March 19, 2020, the NCUC issued an order directing that utilities under its jurisdiction suspend disconnections for nonpayment of utility bills during the state of emergency (as defined by Executive Order No. 116) and allow for customers to enter into payment arrangements to pay off arrearages accumulated during the state of emergency after the end of the state of emergency. Additionally, to help mitigate the financial impacts of the COVID-19 pandemic on their customers, on March 19, 2020, Duke Energy Carolinas and Duke Energy Progress filed a request with the NCUC seeking authorization to waive: (1) any late payment charges incurred by a residential or nonresidential customer, effective March 21, 2020; (2) the application of fees for checks returned for insufficient funds for residential and nonresidential customers; (3) the reconnection charge when a residential or nonresidential customer seeks to have service restored for those customers whose service was recently disconnected for nonpayment and to work with customers regarding the other requirements to restore service, including re-establishment of credit; and (4) the fees and charges associated with the use of credit cards or debit cards to pay residential electric utility bills, effective March 21, 2020. The NCUC granted the companies’ request on March 20, 2020. On March 31, 2020, the governor issued Executive Order No. 124, which, in addition to requiring the steps in the NCUC order noted above, stated that nothing in Executive Order No. 124 shall relieve a customer of its obligation to pay bills for receipt of utility services provided. Executive Order No. 124 remains in effect for 60 days unless otherwise rescinded or replaced with a superseding Executive Order. On May 30, 2020, the governor issued Executive Order No. 142, which extended effective period for Executive Order No. 124 to July 29, 2020. Executive Order No. 142 was not extended. On July 10, 2020, Duke Energy Carolinas and Duke Energy Progress filed a petition with the NCUC for clarification regarding when they may begin working with customers on establishing payment arrangements for arrears accumulated since March 13, 2020. On July 29, 2020, the NCUC issued its Order Lifting Disconnection Moratorium and Allowing Collection of Arrearages Pursuant to Special Repayment Plans. The order contained the following: 1) public utilities may resume customer disconnections due to nonpayment for bills first rendered on or after September 1, 2020, after appropriate notice; 2) the late fee moratorium will continue through the end of the state of emergency or until further order of the commission; 3) Duke Energy utilities may reinstate fees for checks returned for insufficient funds as well as transaction fees for use of credit cards or debit cards for bills first rendered on or after September 1, 2020; and 4) no sooner than September 1, 2020, the collection of past-due or delinquent accounts accrued up to and including August 31, 2020, may proceed subject to conditions. Duke Energy Carolinas and Duke Energy Progress filed a joint petition on August 7, 2020, with the NCUC for deferral treatment of incremental costs and waived customer fees due to the COVID-19 pandemic. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. South Carolina On March 13, 2020, Governor Henry McMaster issued Executive Order No. 2020-08 declaring a state of emergency due to the COVID-19 pandemic. The governor also issued a letter on March 14, 2020, to the ORS Executive Director regarding the suspension of disconnection of essential utility services for nonpayment. On March 18, 2020, the PSCSC issued an order approving such waivers, and also approved waivers for regulations related to late fees and reconnect fees. The PSCSC's order also required utilities to track the financial impacts of actions taken pursuant to such waivers for possible reporting to the PSCSC. On April 30, 2020, the ORS requested the PSCSC grant a waiver of the applicable regulations to allow customers the flexibility to obtain deferred payment plans longer than six months for past-due amounts. On May 5, 2020, Duke Energy Carolinas and Duke Energy Progress filed responsive comments stating that while utility bills will remain due, Duke Energy Carolinas and Duke Energy Progress do not plan to immediately reinstitute disconnection upon the expiration of the state of emergency and intend to work through a potential grace period as economic recovery begins. Duke Energy Carolinas and Duke Energy Progress also concurred with the observation of the ORS that reduced usage is impacting the fixed-cost recovery and revenue assumptions included in rates. Those costs include not only ongoing operational and financing costs necessary to serve customers, but also the borrowings necessary to support extended payment arrangements that will be an important part of emerging from the COVID-19 pandemic. Duke Energy Carolinas and Duke Energy Progress will continue to track such costs, lost revenues and potential cost savings for future evaluation by the PSCSC. Additionally, on May 8, 2020, the ORS filed a motion for the PSCSC to solicit comments from utilities and interested stakeholders regarding measures to be taken to mitigate impacts of COVID-19 on utility customers and require recordkeeping. In a detailed motion, the ORS specifically asked the PSCSC to: (1) solicit input from utilities regarding the temporary mitigation measures to address COVID-19; (2) request utilities to inform the PSCSC of the plans utilities have to return to normalized operations; (3) require utilities to track revenue impacts, incremental costs and savings related to COVID-19 and file the findings with the PSCSC on a quarterly basis; and (4) include any other matters that the PSCSC believes should be addressed. On May 14, 2020, the PSCSC adopted the ORS' motion. On May 13, 2020, the ORS filed a letter with the PSCSC that included a request from Governor McMaster that utilities proceed with developing and implementing plans for phasing in normal business operations. On May 14, 2020, the PSCSC conditionally vacated the regulation waivers regarding termination of service and suspension of disconnect fees. Prior to termination, utilities are to refer past-due customers to local organizations for assistance and/or deferred payment arrangements. Duke Energy Carolinas and Duke Energy Progress filed a report on June 30, 2020, as required by PSCSC order, reporting revenue impact, costs and savings related to COVID-19 to date. Duke Energy Carolinas and Duke Energy Progress are evaluating a filing with the PSCSC for deferral treatment of incremental costs and waived customer fees due to the COVID-19 pandemic. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. Duke Energy Carolinas 2017 North Carolina Rate Case On August 25, 2017, Duke Energy Carolinas filed an application with the NCUC for a rate increase for retail customers of approximately $647 million . On February 28, 2018, Duke Energy Carolinas and the North Carolina Public Staff (Public Staff) filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included a return on equity of 9.9% and a capital structure of 52% equity and 48% debt. On June 22, 2018, the NCUC issued an order approving the Stipulation of Partial Settlement and requiring a revenue reduction. The North Carolina Attorney General and other parties separately filed Notices of Appeal to the North Carolina Supreme Court. On August 8, 2018, the Public Staff filed a Notice of Cross Appeal to the North Carolina Supreme Court. On November 29, 2018, the North Carolina Attorney General's Office filed a motion with the North Carolina Supreme Court requesting the court consolidate the Duke Energy Carolinas and Duke Energy Progress appeals and enter an order adopting the parties’ proposed briefing schedule as set out in the filing. On November 29, 2018, the North Carolina Supreme Court adopted a schedule for briefing set forth in the motion to consolidate the Duke Energy Carolinas and Duke Energy Progress appeals. Appellant briefs were filed on April 26, 2019. The Appellee response briefs were filed on September 25, 2019. Oral arguments before the North Carolina Supreme Court were held on March 11, 2020. Duke Energy Carolinas cannot predict the outcome of this matter. 2019 North Carolina Rate Case On September 30, 2019, Duke Energy Carolinas filed an application with the NCUC for a net rate increase for retail customers of approximately $291 million , which represented an approximate 6% increase in annual base revenues. The gross rate case revenue increase request was $445 million , which was offset by an EDIT rider of $154 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Carolinas requested rates be effective no later than August 1, 2020. The NCUC established a procedural schedule with an evidentiary hearing to begin on March 23, 2020. On March 16, 2020, in consideration of public health and safety as a result of the COVID-19 pandemic, Duke Energy Carolinas filed a motion with the NCUC seeking a suspension of the procedural schedule in the rate case, including issuing discovery requests, and postponement of the evidentiary hearing for 60 days. Also on March 16, 2020, the NCUC issued an Order Postponing Hearing and Addressing Procedural Matters, which postponed the evidentiary hearing until further order by the commission. On March 25, 2020, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement, which is subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. Major components of the settlement included: • Removal of deferred storm costs from the rate case; • Filing a petition seeking to securitize the deferred storm costs within 120 days of a commission order in this rate case regarding the reasonableness and prudency of the storm costs; • Agreement of certain assumptions to demonstrate the quantifiable benefits to customers of a securitization financing; and • Agreement on certain accounting matters, including recovery of employee incentives, severance, aviation costs and executive compensation. On May 6, 2020, Duke Energy Carolinas, Duke Energy Progress and the Public Staff filed a joint motion requesting that the NCUC issue an order scheduling one consolidated evidentiary hearing to consider the companies’ applications for net rate increases. On June 17, 2020, the NCUC issued an order adopting procedures for the expert witness hearings to take place in three phases: 1) a hearing on issues common to both rate cases conducted remotely; 2) a hearing on Duke Energy Carolinas specific rate case issues conducted in person, followed immediately by; 3) a hearing on Duke Energy Progress specific rate case issues conducted in person. On July 24, 2020, Duke Energy Carolinas filed its request for approval of its notice to customers required to implement temporary rates. On July 27, 2020, Duke Energy Carolinas filed a joint motion with Duke Energy Progress and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff and requesting a postponement of the evidentiary hearing until August 24, 2020. The NCUC granted the joint motion on July 27, 2020. Also on July 27, 2020, Duke Energy Carolinas filed a letter stating that it intended to update its temporary rates calculation to reflect the terms of the partial settlement. On July 31, 2020, Duke Energy Carolinas and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), which is subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. Major components of the Second Partial Settlement included: • A return on equity of 9.6% and a capital structure of 52% equity and 48% debt; • Agreement on amortization over a five-year period for unprotected federal EDIT flowbacks to customers; • Agreement on the inclusion of plant in service and other revenue requirement updates through May 31, 2020, subject to Public Staff review. Annual revenue requirement associated with the May 31 update is estimated at $45 million ; and • Settlement on certain grid deferral projects of $0.8 billion and agreement to withdraw Duke Energy Carolinas' request for deferral of remaining grid projects of $0.5 billion . The remaining items to be litigated at hearing include recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting, implementation of new depreciation rates and amortization of the hydro station sale. As a result of the additional settlement terms, the NCUC ordered the Duke Energy Carolinas and Duke Energy Progress remote, consolidated evidentiary hearing to be delayed until August 24, 2020. On August 4, 2020, Duke Energy Carolinas, filed an amended motion for approval of its amended notice to customers, seeking to exercise its statutory right to implement temporary rates subject to refund on or after August 24, 2020. The revenue requirement to be recovered, subject to refund, through the temporary rates is based on and consistent with the base rate component of the Second Partial Settlement with the Public Staff and excludes the items to be litigated noted above. Duke Energy Carolinas will not begin the amortization or implementation of these items until a final order is issued in the rate case and new base rates are implemented. These items will also be excluded when determining whether a refund of amounts collected through these temporary rates is needed. In addition, Duke Energy Carolinas also seeks authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The temporary rate changes are not final rates and remain subject to the NCUC's determination of the just and reasonable rates to be charged by Duke Energy Carolinas on a permanent basis. The NCUC approved the August 4, 2020 amended temporary rates motion on August 6, 2020. Duke Energy Carolinas expects the NCUC to issue an order on its net rate increase by the end of the year. Duke Energy Carolinas cannot predict the outcome of this matter. 2018 South Carolina Rate Case On November 8, 2018, Duke Energy Carolinas filed an application with the PSCSC for a rate increase for retail customers of approximately $168 million . After hearings in March 2019, the PSCSC issued an order on May 21, 2019, which included a return on equity of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components: • Approval of cancellation of the Lee Nuclear Project, with Duke Energy Carolinas maintaining the Combined Operating License; • Approval of recovery of $125 million (South Carolina retail portion) of Lee Nuclear Project development costs (including AFUDC through December 2017) over a 12 -year period, but denial of a return on the deferred balance of costs; • Approval of recovery of $96 million of coal ash costs over a five-year period with a return at Duke Energy Carolinas' WACC; • Denial of recovery of $115 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule; • Approval of a $66 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%; • Approval of a $45 million decrease through the EDIT Rider to return EDIT resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with the Average Rate Assumption Method (ARAM) for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a five-year period for the deferred revenues; and • Approval of a $17 million decrease through the EDIT Rider related to reductions in the North Carolina state income tax rate from 6.9% to 2.5% to be returned over a five-year period. As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Carolinas filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Carolinas were prejudiced by unlawful, arbitrary and capricious rulings by the commission on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Carolinas' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, return on equity and the recovery of a return on deferred operation and maintenance expenses. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Carolinas filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. On November 20, 2019, the South Carolina Energy Users Committee filed a Notice of Appeal and the ORS filed a Notice of Cross Appeal with the Supreme Court of South Carolina. On February 12, 2020, Duke Energy Carolinas and the ORS filed a joint motion to extend briefing schedule deadlines, which was approved by the Supreme Court of South Carolina on February 20, 2020. On March 10, 2020, the ORS filed a consent motion requesting withdrawal of their appeal, which was granted by the Supreme Court of South Carolina on April 30, 2020. Initial briefs were filed on April 21, 2020, which included the South Carolina Energy User's Committee brief arguing that the PSCSC erred in allowing Duke Energy Carolinas' recovery of costs related to the Lee Nuclear Station. Response briefs were filed on July 6, 2020, and reply briefs are due on August 11, 2020. Based on legal analysis and the filing of the appeal, Duke Energy Carolinas has not recorded an adjustment for its deferred coal ash costs. Duke Energy Carolinas cannot predict the outcome of this matter. Duke Energy Progress 2017 North Carolina Rate Case On June 1, 2017, Duke Energy Progress filed an application with the NCUC for a rate increase for retail customers of approximately $477 million , which was subsequently adjusted to $420 million . On November 22, 2017, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included a return on equity of 9.9% and a capital structure of 52% equity and 48% debt. On February 23, 2018, the NCUC issued an order approving the stipulation. The Public Staff, the North Carolina Attorney General and the Sierra Club filed notes of appeal to the North Carolina Supreme Court. On November 29, 2018, the North Carolina Attorney General's Office filed a motion with the North Carolina Supreme Court requesting the court consolidate the Duke Energy Progress and Duke Energy Carolinas appeals and enter an order adopting the parties’ proposed briefing schedule as set out in the filing. Appellant briefs were filed on April 26, 2019. The Appellee response briefs were filed on September 25, 2019. Oral arguments before the North Carolina Supreme Court were held on March 11, 2020. Duke Energy Progress cannot predict the outcome of this matter. 2019 North Carolina Rate Case On October 30, 2019, Duke Energy Progress filed an application with the NCUC for a net rate increase for retail customers of approximately $464 million , which represented an approximate 12.3% increase in annual base revenues. The gross rate case revenue increase request was $586 million , which was offset by riders of $122 million , primarily an EDIT rider of $120 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Progress seeks to defer and recover incremental Hurricane Dorian storm costs in this proceeding and requests rates be effective no later than September 1, 2020. As a result of the COVID-19 pandemic, on March 24, 2020, the NCUC suspended the procedural schedule and postponed the previously scheduled evidentiary hearing on this matter indefinitely. On April 7, 2020, the NCUC issued an order partially resuming the procedural schedule requiring intervenors to file direct testimony on April 13, 2020. Public Staff filed supplemental direct testimony on April 23, 2020. Duke Energy Progress filed rebuttal testimony on May 4, 2020. On June 2, 2020, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, which is subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. Major components of the settlement included: • Removal of deferred storm costs from the rate case; • Filing a petition seeking to securitize the deferred storm costs within 120 days of a commission order in this rate case regarding the reasonableness and prudency of the storm costs; • Agreement of certain assumptions to demonstrate the quantifiable benefits to customers of a securitization financing; • Agreement that the Asheville CC project is complete and in service and agreement on the amount to be included in rate base; and • Agreement on certain accounting matters, including recovery of employee incentives, severance, aviation costs and executive compensation. On May 6, 2020, Duke Energy Progress, Duke Energy Carolinas and the Public Staff filed a joint motion requesting that the NCUC issue an order scheduling one consolidated evidentiary hearing to consider the companies’ applications for net rate increases. On June 17, 2020, the NCUC issued an order adopting procedures for the expert witness hearings to take place in three phases: 1) a hearing on issues common to both rate cases conducted remotely; 2) a hearing on Duke Energy Carolinas specific rate case issues conducted in person, followed immediately by; 3) a hearing on Duke Energy Progress specific rate case issues conducted in person. On July 27, 2020, Duke Energy Progress filed a joint motion with Duke Energy Carolinas and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff and requesting a postponement of the evidentiary hearing until August 24, 2020. The NCUC granted the joint motion on July 27, 2020. On July 31, 2020, Duke Energy Progress and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), which is subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. Major components of the Second Partial Settlement included: • A return on equity of 9.6% and a capital structure of 52% equity and 48% debt; • Agreement on amortization over a five-year period for unprotected federal EDIT flowbacks to customers; • Agreement on the inclusion of plant in service and other revenue requirement updates through May 31, 2020, subject to Public Staff review. Annual revenue requirement associated with the May 31 update is estimated at $25 million ; and • Settlement on certain grid deferral projects of $0.5 billion and agreement to withdraw Duke Energy Progress' request for deferral of remaining grid projects of $0.5 billion . The remaining items to be litigated at hearing include recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting and implementation of new depreciation rates. As a result of the additional settlement terms, the NCUC ordered the Duke Energy Progress and Duke Energy Carolinas remote, consolidated evidentiary hearing to be delayed until August 24, 2020. On August 7, 2020, Duke Energy Progress filed a motion for approval of notice required to implement temporary rates , seeking to exercise its statutory right to implement temporary rates subject to refund on or after September 1, 2020. The revenue requirement to be recovered subject to refund through the temporary rates is based on and consistent with the terms of the base rate component of the settlement agreements with the Public Staff and excludes items to be litigated noted above. Duke Energy Progress will not begin the amortization or implementation of these items until a final determination is issued in the rate case and new base rates are implemented. These items will also be excluded when determining whether a refund of amounts collected through these temporary rates is needed. In addition, Duke Energy Progress also seeks authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The temporary rate changes are not final rates and remain subject to the NCUC's determination of the just and reasonable rates to be charged by Duke Energy Progress on a permanent basis. Duke Energy Progress expects the NCUC to issue an order on its net rate increase by the end of the year. Duke Energy Progress cannot predict the outcome of this matter. Hurricane Dorian Hurricane Dorian reached the Carolinas in September 2019 as a Category 2 hurricane making landfall within Duke Energy Progress’ service territory. Total estimated incremental operation and maintenance expenses incurred to repair and restore the system are approximately $165 million with an additional $4 million in capital investments made for restoration efforts. Approximately $139 million and $179 million of the operation and maintenance expenses are deferred in Regulatory assets within Other Noncurrent Assets on the Condensed Consolidated Balance Sheets as of June 30, 2020, and December 31, 2019, respectively. A request for an accounting order to defer incremental storm costs associated with Hurricane Dorian was included in Duke Energy Progress' October 30, 2019, general rate case filing with the NCUC. Terms of the June 2, 2020, Agreement and Stipulation of Partial Settlement removed incremental storm costs from the general rate case. A petition seeking to securitize these costs will be filed within 120 days of an NCUC order in the general rate case. Duke Energy Progress cannot predict the outcome of this matter. On February 7, 2020, a petition was filed with the PSCSC in the 2019 storm deferrals docket requesting deferral of approximately $22 million in operation and maintenance expenses to an existing storm deferral balance previously approved by the PSCSC. The PSCSC voted to approve the request on March 4, 2020, and issued a final order on April 7, 2020. On July 1, 2020, Duke Energy Progress filed a supplemental true up reducing the actual costs to $17 million . 2018 South Carolina Rate Case On November 8, 2018, Duke Energy Progress filed an application with the PSCSC for a rate increase for retail customers of approximately $59 million . After hearings in April 2019, the PSCSC issued an order on May 21, 2019, which included a return on equity of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components: • Approval of recovery of $4 million of coal ash costs over a five-year period with a return at Duke Energy Progress' WACC; • Denial of recovery of $65 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule; • Approval of a $17 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%; • Approval of a $12 million decrease through the EDIT Tax Savings Rider resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with ARAM for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a three-year period for the deferred revenues; and • Approval of a $12 million increase due to the expiration of EDIT related to reductions in the North Carolina state income tax rate from 6.9% to 2.5%. As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Progress filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Progress were prejudiced by unlawful, arbitrary and capricious rulings by the commission on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a Directive denying Duke Energy Progress' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, return on equity and the recovery of a return on deferred operation and maintenance expenses, but allowing additional litigation-related costs. As a result of the Directive allowing litigation-related costs, customer rates were revised effective July 1, 2019. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Progress filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. The ORS filed a Notice of Cross Appeal on November 20, 2019. On February 12, 2020, Duke Energy Progress and the ORS filed a joint motion to extend briefing schedule deadlines, which was approved by the Supreme Court of South Carolina on February 20, 2020. On March 10, 2020, the ORS filed a consent motion requesting withdrawal of their appeal, which was granted by the Supreme Court of South Carolina on April 30, 2020. Initial briefs were filed on April 21, 2020. Response briefs were filed on July 6, 2020, and reply briefs are due on August 11, 2020. Based on legal analysis and the filing of the appeal, Duke Energy Progress has not recorded an adjustment for its deferred coal ash costs. Duke Energy Progress cannot predict the outcome of this matter. Western Carolinas Modernization Plan Duke Energy Progress retired the 376 -MW Asheville coal-fired plant on January 29, 2020, at which time the net book value, including associated ash basin closure costs, of $214 million was transferred from Generation facilities to be retired, net to Regulatory assets within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. On December 27, 2019, Asheville Combined Cycle Unit 5 Combustion Turbine and Unit 6 Steam Turbine Generator and the common systems that serve combined cycle units went into commercial operation. Duke Energy Progress placed the Unit 7 Combustion Turbine into commercial operation in simple-cycle mode on January 15, 2020. The Unit 8 Steam Turbine Generator went into commercial operation on April 5, 2020. On June 2, 2020, Duke Energy Progress filed a request with the PSCSC for an accounting order for the deferral of post-in-service costs incurred in connection with the addition of the Asheville combined cycle generating plant. The petition requested the PSCSC issue an accounting order authorizing Duke Energy Progress to defer post-in-service costs including the Asheville combined cycle’s depreciation expense, property taxes, incremental O&M and carrying costs at WACC of approximately $8 million annually. On June 17, 2020, the PSCSC voted to approve the petition and issued its final order on July 6, 2020. On October 8, 2018, Duke Energy Progress filed an application

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES ENVIRONMENTAL The Duke Energy Registrants are subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These regulations can be changed from time to time, imposing new obligations on the Duke Energy Registrants. The following environmental matters impact all Duke Energy Registrants. Remediation Activities In addition to AROs recorded as a result of various environmental regulations, the Duke Energy Registrants are responsible for environmental remediation at various sites. These include certain properties that are part of ongoing operations and sites formerly owned or used by Duke Energy entities. These sites are in various stages of investigation, remediation and monitoring. Managed in conjunction with relevant federal, state and local agencies, remediation activities vary based upon site conditions and location, remediation requirements, complexity and sharing of responsibility. If remediation activities involve joint and several liability provisions, strict liability, or cost recovery or contribution actions, the Duke Energy Registrants could potentially be held responsible for environmental impacts caused by other potentially responsible parties and may also benefit from insurance policies or contractual indemnities that cover some or all cleanup costs. Liabilities are recorded when losses become probable and are reasonably estimable. The total costs that may be incurred cannot be estimated because the extent of environmental impact, allocation among potentially responsible parties, remediation alternatives and/or regulatory decisions have not yet been determined at all sites. Additional costs associated with remediation activities are likely to be incurred in the future and could be significant. Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable. The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts Payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) June 30, 2020 December 31, 2019 Reserves for Environmental Remediation Duke Energy $ 55 $ 58 Duke Energy Carolinas 10 11 Progress Energy 14 16 Duke Energy Progress 5 4 Duke Energy Florida 8 9 Duke Energy Ohio 19 19 Duke Energy Indiana 5 4 Piedmont 7 8 Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below. (in millions) Duke Energy $ 59 Duke Energy Carolinas 11 Duke Energy Ohio 42 LITIGATION Duke Energy Carolinas and Duke Energy Progress Coal Ash Insurance Coverage Litigation In March 2017, Duke Energy Carolinas and Duke Energy Progress filed a civil action in North Carolina Business Court against various insurance providers. The lawsuit seeks payment for coal ash-related liabilities covered by third-party liability insurance policies. The insurance policies were issued between 1971 and 1986 and provide third-party liability insurance for property damage. The civil action seeks damages for breach of contract and indemnification for costs arising from the Coal Ash Act and the EPA CCR rule at 15 coal-fired plants in North Carolina and South Carolina. In February and March 2020, the court heard arguments on numerous cross motions filed by the parties to seek legal determinations concerning several insurance related defenses raised by the insurance providers. On June 5, 2020, the court issued four rulings in favor of Duke Energy's legal positions in the coal ash recovery litigation proceedings. Due to COVID-19, the court has issued a new scheduling order and the trial is now scheduled for January 2022. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. Duke Energy Carolinas Asbestos-related Injuries and Damages Claims Duke Energy Carolinas has experienced numerous claims for indemnification and medical cost reimbursement related to asbestos exposure. These claims relate to damages for bodily injuries alleged to have arisen from exposure to or use of asbestos in connection with construction and maintenance activities conducted on its electric generation plants prior to 1985. As of June 30, 2020 , there were 118 asserted claims for non-malignant cases with cumulative relief sought of up to $27 million , and 59 asserted claims for malignant cases with cumulative relief sought of up to $20 million . Based on Duke Energy Carolinas’ experience, it is expected that the ultimate resolution of most of these claims likely will be less than the amount claimed. Duke Energy Carolinas has recognized asbestos-related reserves of $590 million at June 30, 2020 , and $604 million at December 31, 2019 . These reserves are classified in Other within Other Noncurrent Liabilities and Other within Current Liabilities on the Condensed Consolidated Balance Sheets. These reserves are based upon Duke Energy Carolinas' best estimate for current and future asbestos claims through 2039 and are recorded on an undiscounted basis. In light of the uncertainties inherent in a longer-term forecast, management does not believe they can reasonably estimate the indemnity and medical costs that might be incurred after 2039 related to such potential claims. It is possible Duke Energy Carolinas may incur asbestos liabilities in excess of the recorded reserves. Duke Energy Carolinas has third-party insurance to cover certain losses related to asbestos-related injuries and damages above an aggregate self-insured retention. Duke Energy Carolinas’ cumulative payments began to exceed the self-insured retention in 2008. Future payments up to the policy limit will be reimbursed by the third-party insurance carrier. The insurance policy limit for potential future insurance recoveries indemnification and medical cost claim payments is $747 million in excess of the self-insured retention. Receivables for insurance recoveries were $742 million at June 30, 2020 , and December 31, 2019 . These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Condensed Consolidated Balance Sheets. Duke Energy Carolinas is not aware of any uncertainties regarding the legal sufficiency of insurance claims. Duke Energy Carolinas believes the insurance recovery asset is probable of recovery as the insurance carrier continues to have a strong financial strength rating. Duke Energy Progress and Duke Energy Florida Spent Nuclear Fuel Matters On June 18, 2018, Duke Energy Progress and Duke Energy Florida sued the U.S. in the U.S. Court of Federal Claims for damages incurred for the period 2014 through 2018. The lawsuit claimed the Department of Energy breached a contract in failing to accept spent nuclear fuel under the Nuclear Waste Policy Act of 1982 and asserted damages for the cost of on-site storage in the amount of $100 million and $203 million for Duke Energy Progress and Duke Energy Florida, respectively. Discovery is ongoing and a trial is expected to occur in 2021. Duke Energy Florida Power Purchase Dispute Arbitration Duke Energy Florida, on behalf of its customers, entered into a power purchase contract for the purchase of firm capacity and energy from a qualified facility. Duke Energy Florida determined the qualified facility did not perform in accordance with the power purchase contract, and Duke Energy Florida terminated the power purchase contract. The qualified facility counterparty filed a confidential American Arbitration Association (AAA) arbitration demand, challenging the termination of the power purchase contract and seeking damages. Duke Energy Florida denies liability and is vigorously defending the arbitration claim. The final arbitration hearing is scheduled for December 2020. Duke Energy Florida cannot predict the outcome of this matter. Duke Energy Indiana Coal Ash Basin Closure Plan Appeal On January 27, 2020, Hoosier Environmental Council filed a Petition for Administrative Review with the Indiana Office of Environmental Adjudication (the court) challenging the Indiana Department of Environmental Management’s December 10, 2019, partial approval of Duke Energy Indiana’s ash pond closure plan. On March 11, 2020, Duke Energy Indiana filed a Motion to Dismiss. On May 5, 2020, the court entered an order denying that motion. The parties are engaged in discovery and a hearing is scheduled for February 22, 2021. Duke Energy Indiana cannot predict the outcome of this matter. Other Litigation and Legal Proceedings The Duke Energy Registrants are involved in other legal, tax and regulatory proceedings arising in the ordinary course of business, some of which involve significant amounts. The Duke Energy Registrants believe the final disposition of these proceedings will not have a material effect on their results of operations, cash flows or financial position. The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves discussed above. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above. (in millions) June 30, 2020 December 31, 2019 Reserves for Legal Matters Duke Energy $ 60 $ 62 Duke Energy Carolinas 3 2 Progress Energy 52 55 Duke Energy Progress 9 12 Duke Energy Florida 23 22 Piedmont 1 1 OTHER COMMITMENTS AND CONTINGENCIES General As part of their normal business, the Duke Energy Registrants are party to various financial guarantees, performance guarantees and other contractual commitments to extend guarantees of credit and other assistance to various subsidiaries, investees and other third parties. These guarantees involve elements of performance and credit risk, which are not fully recognized on the Condensed Consolidated Balance Sheets and have uncapped maximum potential payments. However, the Duke Energy Registrants do not believe these guarantees will have a material effect on their results of operations, cash flows or financial position. In addition, the Duke Energy Registrants enter into various fixed-price, noncancelable commitments to purchase or sell power or natural gas, take-or-pay arrangements, transportation, or throughput agreements and other contracts that may or may not be recognized on their respective Condensed Consolidated Balance Sheets. Some of these arrangements may be recognized at fair value on their respective Condensed Consolidated Balance Sheets if such contracts meet the definition of a derivative and the NPNS exception does not apply. In most cases, the Duke Energy Registrants’ purchase obligation contracts contain provisions for price adjustments, minimum purchase levels and other financial commitments. As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The reserve for credit losses for insurance receivables based on adoption of the new standard is $15 million for Duke Energy and Duke Energy Carolinas as of June 30, 2020 . Insurance receivables are evaluated based on the risk of default and the historical losses, current conditions and expected conditions around collectability. Management evaluates the risk of default annually based on payment history, credit rating and changes in the risk of default from credit agencies. As of June 30, 2020 , Duke Energy recognized $860 million related to the guarantees of ACP's outstanding debt of which $95 million was previously recognized due the adoption of new guidance for credit losses effective January 1, 2020. This reserve is included within Other current liabilities on the Condensed Consolidated Balance Sheets. See Notes 1, 3 and 11 for more information. The remaining reserve for credit losses for financial guarantees of $4 million as of June 30, 2020 , is included within Other noncurrent liabilities on the Duke Energy's Condensed Consolidated Balance Sheets. Management considers financial guarantees for evaluation under this standard based on the anticipated amount outstanding at the time of default. The reserve for credit losses is based on the evaluation of the contingent components of financial guarantees. Management evaluates the risk of default, exposure and length of time remaining in the period for each contract.

Debt and Credit Facilities

Debt and Credit Facilities	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Debt And Credit Facilities	DEBT AND CREDIT FACILITIES SUMMARY OF SIGNIFICANT DEBT ISSUANCES The following table summarizes significant debt issuances (in millions). Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Florida Ohio Indiana Piedmont Unsecured Debt May 2020 (a) Jun 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — May 2020 (b) Jun 2050 3.350 % 400 — — — — — 400 First Mortgage Bonds January 2020 (c) Feb 2030 2.450 % 500 — 500 — — — — January 2020 (c) Aug 2049 3.200 % 400 — 400 — — — — March 2020 (d) Apr 2050 2.750 % 550 — — — — 550 — May 2020 (b) Jun 2030 2.125 % 400 — — — 400 — — June 2020 (b) Jun 2030 1.750 % 500 — — 500 — — — Total issuances $ 3,250 $ 500 $ 900 $ 500 $ 400 $ 550 $ 400 (a) Debt issued to repay $500 million borrowing made under Duke Energy (Parent) revolving credit facility in March 2020, and for general corporate purposes. (b) Debt issued to repay short-term debt and for general corporate purposes. (c) Debt issued to repay at maturity $450 million first mortgage bonds due June 2020 and for general corporate purposes. (d) Debt issued to repay at maturity $500 million first mortgage bonds due July 2020 and to pay down short-term debt. CURRENT MATURITIES OF LONG-TERM DEBT The following table shows the significant components of Current Maturities of Long-Term Debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings. (in millions) Maturity Date Interest Rate June 30, 2020 Unsecured Debt Duke Energy Progress December 2020 0.986 % (a) $ 700 Progress Energy, Inc January 2021 4.400 % 500 Duke Energy (Parent) May 2021 0.924 % (a) 500 Piedmont June 2021 4.240 % 160 Secured Debt Duke Energy Florida April 2021 1.384 % (a) 250 First Mortgage Bonds Duke Energy Indiana July 2020 3.750 % 500 Duke Energy Progress September 2020 0.498 % (a) 300 Duke Energy Carolinas June 2021 3.900 % 500 Other (b) 346 Current maturities of long-term debt $ 3,756 (a) Debt has a floating interest rate. (b) Includes finance lease obligations, amortizing debt and small bullet maturities. AVAILABLE CREDIT FACILITIES Master Credit Facility In March 2020, Duke Energy amended its existing $8 billion Master Credit Facility to extend the termination date to March 2025 . The Duke Energy Registrants, excluding Progress Energy, have borrowing capacity under the Master Credit Facility up to a specified sublimit for each borrower. Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower. The amount available under the Master Credit Facility has been reduced to backstop issuances of commercial paper, certain letters of credit and variable-rate demand tax-exempt bonds that may be put to the Duke Energy Registrants at the option of the holder. The table below includes the current borrowing sublimits and available capacity under these credit facilities. June 30, 2020 Duke Duke Duke Duke Duke Duke Duke Energy Energy Energy Energy Energy Energy (in millions) Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Facility size (a) $ 8,000 $ 2,650 $ 1,500 $ 1,250 $ 800 $ 600 $ 600 $ 600 Reduction to backstop issuances Commercial paper (b) (2,480 ) (1,248 ) (389 ) (323 ) (156 ) (79 ) (150 ) (135 ) Outstanding letters of credit (47 ) (40 ) (3 ) (2 ) — — — (2 ) Tax-exempt bonds (81 ) — — — — — (81 ) — Available capacity under the Master Credit Facility $ 5,392 $ 1,362 $ 1,108 $ 925 $ 644 $ 521 $ 369 $ 463 (a) Represents the sublimit of each borrower. (b) Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies on the Condensed Consolidated Balance Sheets. Term Loan Facility In response to market volatility and ongoing liquidity impacts from COVID-19, in March 2020, Duke Energy (Parent) entered into a $1.5 billion , 364-day Term Loan Credit Agreement, borrowing the full $1.5 billion available on March 19, 2020. The term loan contains a provision for increasing the amount available for borrowing by up to $500 million . Duke Energy (Parent) exercised this provision on March 27, 2020, borrowing an additional $188 million . Proceeds were used to reduce outstanding commercial paper and for general corporate purposes. Refer to Note 1 for additional information on the COVID-19 pandemic. Other Credit Facilities June 30, 2020 (in millions) Facility size Amount drawn Duke Energy (Parent) Three-Year Revolving Credit Facility (a) $ 1,000 $ 500 Duke Energy Progress Term Loan Facility 700 700 (a) In March 2020, Duke Energy (Parent) drew down the remaining $500 million . In May 2020, Duke Energy (Parent) repaid $500 million with proceeds of May 2020 unsecured debt issuance.

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL Duke Energy The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at June 30, 2020 , and December 31, 2019 . Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill balance $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122 ) (122 ) Goodwill, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303 Duke Energy Ohio Duke Energy Ohio's Goodwill balance of $920 million , allocated $596 million to Electric Utilities and Infrastructure and $324 million to Gas Utilities and Infrastructure, is presented net of accumulated impairment charges of $216 million on the Condensed Consolidated Balance Sheets at June 30, 2020 , and December 31, 2019 . Progress Energy Progress Energy's Goodwill is included in the Electric Utilities and Infrastructure segment and there are no accumulated impairment charges. Piedmont Piedmont's Goodwill is included in the Gas Utilities and Infrastructure segment and there are no accumulated impairment charges.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Subsidiary Registrants engage in related party transactions in accordance with applicable state and federal commission regulations. Refer to the Condensed Consolidated Balance Sheets of the Subsidiary Registrants for balances due to or due from related parties. Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 196 $ 197 $ 330 $ 409 Indemnification coverages (b) 5 5 10 10 Joint Dispatch Agreement (JDA) revenue (c) 3 17 10 40 JDA expense (c) 20 20 44 113 Intercompany natural gas purchases (d) 10 3 16 7 Progress Energy Corporate governance and shared service expenses (a) $ 189 $ 183 $ 335 $ 359 Indemnification coverages (b) 9 10 18 19 JDA revenue (c) 20 20 44 113 JDA expense (c) 3 17 10 40 Intercompany natural gas purchases (d) 19 19 38 38 Duke Energy Progress Corporate governance and shared service expenses (a) $ 113 $ 108 $ 188 $ 214 Indemnification coverages (b) 5 4 9 8 JDA revenue (c) 20 20 44 113 JDA expense (c) 3 17 10 40 Intercompany natural gas purchases (d) 19 19 38 38 Duke Energy Florida Corporate governance and shared service expenses (a) $ 76 $ 75 $ 147 $ 145 Indemnification coverages (b) 4 6 9 11 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 77 $ 83 $ 161 $ 168 Indemnification coverages (b) 1 1 2 2 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 92 $ 93 $ 198 $ 190 Indemnification coverages (b) 2 1 4 3 Piedmont Corporate governance and shared service expenses (a) $ 37 $ 37 $ 71 $ 69 Indemnification coverages (b) — — 1 1 Intercompany natural gas sales (d) 29 22 54 45 Natural gas storage and transportation costs (e) 6 6 12 11 (a) The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income. (b) The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income. (c) Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income. (d) Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income. (e) Piedmont has related party transactions as a customer of its equity method investments in Pine Needle LNG Company, LLC, Hardy Storage Company, LLC and Cardinal Pipeline Company, LLC natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Condensed Consolidated Statements of Operations and Comprehensive Income. In addition to the amounts presented above, the Subsidiary Registrants have other affiliate transactions, including rental of office space, participation in a money pool arrangement, other operational transactions, such as pipeline lease arrangements, and their proportionate share of certain charged expenses. These transactions of the Subsidiary Registrants are incurred in the ordinary course of business and are eliminated in consolidation. As discussed in Note 11 , certain trade receivables have been sold by Duke Energy Ohio and Duke Energy Indiana to CRC, an affiliate formed by a subsidiary of Duke Energy. The proceeds obtained from the sales of receivables are largely cash but do include a subordinated note from CRC for a portion of the purchase price. Intercompany Income Taxes Duke Energy and the Subsidiary Registrants file a consolidated federal income tax return and other state and jurisdictional returns. The Subsidiary Registrants have a tax sharing agreement with Duke Energy for the allocation of consolidated tax liabilities and benefits. Income taxes recorded represent amounts the Subsidiary Registrants would incur as separate C-Corporations. The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants. Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Carolinas Energy Progress Florida Ohio Indiana Piedmont June 30, 2020 Intercompany income tax receivable $ — $ 63 $ — $ — $ — $ 10 $ 23 Intercompany income tax payable 19 — 7 51 1 — — December 31, 2019 Intercompany income tax receivable $ — $ 125 $ 28 $ — $ 9 $ 28 $ 13 Intercompany income tax payable 5 — — 2 — — —

Derivatives and Hedging

Derivatives and Hedging	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	DERIVATIVES AND HEDGING The Duke Energy Registrants use commodity and interest rate contracts to manage commodity price risk and interest rate risk. The primary use of commodity derivatives is to hedge the generation portfolio against changes in the prices of electricity and natural gas. Piedmont enters into natural gas supply contracts to provide diversification, reliability and natural gas cost benefits to its customers. Interest rate derivatives are used to manage interest rate risk associated with borrowings. All derivative instruments not identified as NPNS are recorded at fair value as assets or liabilities on the Condensed Consolidated Balance Sheets. Cash collateral related to derivative instruments executed under master netting arrangements is offset against the collateralized derivatives on the Condensed Consolidated Balance Sheets. The cash impacts of settled derivatives are recorded as operating activities on the Condensed Consolidated Statements of Cash Flows. INTEREST RATE RISK The Duke Energy Registrants are exposed to changes in interest rates as a result of their issuance or anticipated issuance of variable-rate and fixed-rate debt and commercial paper. Interest rate risk is managed by limiting variable-rate exposures to a percentage of total debt and by monitoring changes in interest rates. To manage risk associated with changes in interest rates, the Duke Energy Registrants may enter into interest rate swaps, U.S. Treasury lock agreements and other financial contracts. In anticipation of certain fixed-rate debt issuances, a series of forward-starting interest rate swaps or Treasury locks may be executed to lock in components of current market interest rates. These instruments are later terminated prior to or upon the issuance of the corresponding debt. Cash Flow Hedges For a derivative designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the effective portion of the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt. Gains and losses reclassified out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2020 , and 2019 , were not material. Duke Energy's interest rate derivatives designated as hedges include interest rate swaps used to hedge existing debt within the Commercial Renewables business and forward-starting interest rate swaps not accounted for under regulatory accounting. Undesignated Contracts Undesignated contracts primarily include contracts not designated as a hedge because they are accounted for under regulatory accounting or contracts that do not qualify for hedge accounting. Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Condensed Consolidated Statements of Operations and Comprehensive Income. The following table shows notional amounts of outstanding derivatives related to interest rate risk. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 650 $ — $ — $ — $ — $ — Undesignated contracts 1,477 400 1,050 1,050 — 27 Total notional amount (a) $ 2,127 $ 400 $ 1,050 $ 1,050 $ — $ 27 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 993 $ — $ — $ — $ — $ — Undesignated contracts 1,277 450 800 250 550 27 Total notional amount (a) $ 2,270 $ 450 $ 800 $ 250 $ 550 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $650 million in cash flow hedges as of June 30, 2020 , and $693 million in cash flow hedges as of December 31, 2019 . COMMODITY PRICE RISK The Duke Energy Registrants are exposed to the impact of changes in the prices of electricity purchased and sold in bulk power markets and coal and natural gas purchases, including Piedmont's natural gas supply contracts. Exposure to commodity price risk is influenced by a number of factors including the term of contracts, the liquidity of markets and delivery locations. For the Subsidiary Registrants, bulk power electricity and coal and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas costs volatility for customers. Volumes The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 28,179 — — — 4,405 23,774 — Natural gas (millions of dekatherms) 707 147 165 165 — 4 391 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 15,858 — — — 1,887 13,971 — Natural gas (millions of dekatherms) 704 130 160 160 — 3 411 U.S. EQUITY SECURITIES RISK In May 2019, Duke Energy Florida entered into a Decommissioning Services Agreement for the accelerated decommissioning of Crystal River Unit 3 with ADP CR3, LLC and ADP SF1, LLC. See Note 3 for additional information on the accelerated decommissioning. Duke Energy Florida executed U.S. equity option collars within the NDTF in May 2019, to preserve the U.S. equity portfolio value in the Duke Energy Florida NDTF in the event the accelerated decommissioning is approved. The Duke Energy Florida NDTF liquidated the options in April 2020, and received proceeds of approximately $7 million . LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED ON THE CONDENSED CONSOLIDATED BALANCE SHEETS The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Condensed Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown. Derivative Assets June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 20 $ 2 $ 1 $ 1 $ — $ 3 $ 10 $ 4 Noncurrent 7 5 2 2 — — — — Total Derivative Assets – Commodity Contracts $ 27 $ 7 $ 3 $ 3 $ — $ 3 $ 10 $ 4 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Noncurrent 2 — 2 2 — — — — Total Derivative Assets – Interest Rate Contracts $ 5 $ — $ 5 $ 5 $ — $ — $ — $ — Total Derivative Assets $ 32 $ 7 $ 8 $ 8 $ — $ 3 $ 10 $ 4 Derivative Liabilities June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 55 $ 29 $ 17 $ 17 $ — $ — $ 1 $ 7 Noncurrent 138 8 32 16 — — — 98 Total Derivative Liabilities – Commodity Contracts $ 193 $ 37 $ 49 $ 33 $ — $ — $ 1 $ 105 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 56 — — — — — — — Not Designated as Hedging Instruments Current 68 20 48 48 — 1 — — Noncurrent 30 — 24 24 — 6 — — Total Derivative Liabilities – Interest Rate Contracts $ 168 $ 20 $ 72 $ 72 $ — $ 7 $ — $ — Total Derivative Liabilities $ 361 $ 57 $ 121 $ 105 $ — $ 7 $ 1 $ 105 Derivative Assets December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ 3 $ 13 $ 1 Noncurrent 1 — — — — 1 — — Total Derivative Assets – Commodity Contracts $ 18 $ — $ — $ — $ — $ 4 $ 13 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current 6 — 6 — 6 — — — Total Derivative Assets – Interest Rate Contracts $ 6 $ — $ 6 $ — $ 6 $ — $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 1 — 1 — 1 — — — Total Derivative Assets – Equity Securities Contracts $ 1 $ — $ 1 $ — $ 1 $ — $ — $ — Total Derivative Assets $ 25 $ — $ 7 $ — $ 7 $ 4 $ 13 $ 1 Derivative Liabilities December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 67 $ 33 $ 26 $ 26 $ — $ — $ 1 $ 7 Noncurrent 156 10 37 22 — — — 110 Total Derivative Liabilities – Commodity Contracts $ 223 $ 43 $ 63 $ 48 $ — $ — $ 1 $ 117 Interest Rate Contracts Designated as Hedging Instruments Current $ 19 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 8 6 1 1 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 53 $ 6 $ 1 $ 1 $ — $ 6 $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 24 — 24 — 24 — — — Total Derivative Liabilities – Equity Securities Contracts $ 24 $ — $ 24 $ — $ 24 $ — $ — $ — Total Derivative Liabilities $ 300 $ 49 $ 88 $ 49 $ 24 $ 6 $ 1 $ 117 OFFSETTING ASSETS AND LIABILITIES The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below. Derivative Assets June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 23 $ 2 $ 4 $ 4 $ — $ 3 $ 10 $ 4 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Assets: Other $ 20 $ — $ 3 $ 3 $ — $ 3 $ 10 $ 4 Noncurrent Gross amounts recognized $ 9 $ 5 $ 4 $ 4 $ — $ — $ — $ — Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 5 $ 3 $ 2 $ 2 $ — $ — $ — $ — Derivative Liabilities June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 137 $ 49 $ 65 $ 65 $ — $ 1 $ 1 $ 7 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Liabilities: Other $ 134 $ 47 $ 64 $ 64 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 224 $ 8 $ 56 $ 40 $ — $ 6 $ — $ 98 Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 220 $ 6 $ 54 $ 38 $ — $ 6 $ — $ 98 Derivative Assets December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 OBJECTIVE CREDIT CONTINGENT FEATURES Certain derivative contracts contain objective credit contingent features. These features include the requirement to post cash collateral or letters of credit if specific events occur, such as a credit rating downgrade below investment grade. The following tables show information with respect to derivative contracts that are in a net liability position and contain objective credit-risk-related payment provisions. June 30, 2020 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 63 $ 29 $ 34 $ 34 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 63 29 34 34 December 31, 2019 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 79 $ 35 $ 44 $ 44 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 79 35 44 44 The Duke Energy Registrants have elected to offset cash collateral and fair values of derivatives. For amounts to be netted, the derivative and cash collateral must be executed with the same counterparty under the same master netting arrangement.

Investments in Debt and Equity

Investments in Debt and Equity Securities	6 Months Ended
	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investments In Debt And Equity Securities	INVESTMENTS IN DEBT AND EQUITY SECURITIES Duke Energy’s investments in debt and equity securities are primarily comprised of investments held in (i) the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, (ii) the grantor trusts at Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana related to OPEB plans and (iii) Bison. The Duke Energy Registrants classify investments in debt securities as AFS and investments in equity securities as fair value through net income (FV-NI). For investments in debt securities classified as AFS, the unrealized gains and losses are included in other comprehensive income until realized, at which time they are reported through net income. For investments in equity securities classified as FV-NI, both realized and unrealized gains and losses are reported through net income. Substantially all of Duke Energy’s investments in debt and equity securities qualify for regulatory accounting, and accordingly, all associated realized and unrealized gains and losses on these investments are deferred as a regulatory asset or liability. Duke Energy classifies the majority of investments in debt and equity securities as long term, unless otherwise noted. Investment Trusts The investments within the Investment Trusts are managed by independent investment managers with discretion to buy, sell and invest pursuant to the objectives set forth by the investment manager agreements and trust agreements. The Duke Energy Registrants have limited oversight of the day-to-day management of these investments. As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate. Other AFS Securities Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings. There were no material credit losses as of June 30, 2020 , and December 31, 2019 . Other Investments amounts are recorded in Other within Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. DUKE ENERGY The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 731 $ — $ — $ 101 Equity securities 3,034 92 5,039 3,523 55 5,661 Corporate debt securities 66 2 806 37 1 603 Municipal bonds 18 1 417 13 — 368 U.S. government bonds 62 — 813 33 1 1,256 Other debt securities 9 1 194 3 — 141 Total NDTF Investments $ 3,189 $ 96 $ 8,000 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 113 $ — $ — $ 52 Equity securities 51 — 116 57 — 122 Corporate debt securities 8 — 125 3 — 67 Municipal bonds 5 1 103 4 — 94 U.S. government bonds 3 — 40 2 — 41 Other debt securities 1 1 34 — — 56 Total Other Investments $ 68 $ 2 $ 531 $ 66 $ — $ 432 Total Investments $ 3,257 $ 98 $ 8,531 $ 3,675 $ 57 $ 8,562 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 302 $ 66 $ 325 $ 101 Realized losses 67 63 132 93 AFS: Realized gains 27 47 47 57 Realized losses 13 36 19 47 DUKE ENERGY CAROLINAS The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 30 $ — $ — $ 21 Equity securities 1,796 47 2,989 1,914 8 3,154 Corporate debt securities 41 2 519 21 1 361 Municipal bonds 6 — 133 3 — 96 U.S. government bonds 30 — 399 16 1 578 Other debt securities 7 1 188 3 — 137 Total NDTF Investments $ 1,880 $ 50 $ 4,258 $ 1,957 $ 10 $ 4,347 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 27 $ 44 $ 36 $ 67 Realized losses 25 48 70 69 AFS: Realized gains 18 16 30 25 Realized losses 8 11 13 21 PROGRESS ENERGY The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 701 $ — $ — $ 80 Equity securities 1,238 45 2,050 1,609 47 2,507 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,309 $ 46 $ 3,742 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 108 $ — $ — $ 49 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,313 $ 46 $ 3,902 $ 1,655 $ 47 $ 3,883 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 275 $ 22 $ 289 $ 34 Realized losses 42 15 62 24 AFS: Realized gains 6 30 11 31 Realized losses 4 25 5 26 DUKE ENERGY PROGRESS The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 63 $ — $ — $ 53 Equity securities 1,176 45 1,977 1,258 21 2,077 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,247 $ 46 $ 3,031 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,247 $ 46 $ 3,032 $ 1,300 $ 21 $ 3,053 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 26 $ 7 $ 40 $ 17 Realized losses 27 7 47 15 AFS: Realized gains 6 1 11 2 Realized losses 4 1 5 2 DUKE ENERGY FLORIDA The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 638 $ — $ — $ 27 Equity securities 62 — 73 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 62 $ — $ 711 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 54 $ 3 $ — $ 55 Total Investments $ 66 $ — $ 765 $ 355 $ 26 $ 787 (a) During the six months ended June 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3. Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 249 $ 15 $ 249 $ 17 Realized losses 15 8 15 9 AFS: Realized gains — 29 — 29 Realized losses — 24 — 24 DUKE ENERGY INDIANA The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Equity securities $ 39 $ — $ 77 $ 43 $ — $ 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 40 $ 1 $ 122 $ 44 $ — $ 125 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were immaterial. DEBT SECURITY MATURITIES The table below summarizes the maturity date for debt securities. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 63 $ 19 $ 30 $ 28 $ 2 $ 3 Due after one through five years 563 254 244 235 9 15 Due after five through 10 years 587 270 226 219 7 9 Due after 10 years 1,319 696 543 509 34 18 Total $ 2,532 $ 1,239 $ 1,043 $ 991 $ 52 $ 45

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is the exchange price to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. The fair value definition focuses on an exit price versus the acquisition cost. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize use of unobservable inputs. A midmarket pricing convention (the midpoint price between bid and ask prices) is permitted for use as a practical expedient. Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. Certain investments are not categorized within the fair value hierarchy. These investments are measured at fair value using the net asset value (NAV) per share practical expedient. The NAV is derived based on the investment cost, less any impairment, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Fair value accounting guidance permits entities to elect to measure certain financial instruments that are not required to be accounted for at fair value, such as equity method investments or the company’s own debt, at fair value. The Duke Energy Registrants have not elected to record any of these items at fair value. Valuation methods of the primary fair value measurements disclosed below are as follows. Investments in equity securities The majority of investments in equity securities are valued using Level 1 measurements. Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the quarter. Principal active markets for equity prices include published exchanges such as the New York Stock Exchange and Nasdaq Stock Market. Foreign equity prices are translated from their trading currency using the currency exchange rate in effect at the close of the principal active market. There was no after-hours market activity that was required to be reflected in the reported fair value measurements. Investments in debt securities Most investments in debt securities are valued using Level 2 measurements because the valuations use interest rate curves and credit spreads applied to the terms of the debt instrument (maturity and coupon interest rate) and consider the counterparty credit rating. If the market for a particular fixed-income security is relatively inactive or illiquid, the measurement is Level 3. Commodity derivatives Commodity derivatives with clearinghouses are classified as Level 1. If forward price curves are not observable for the full term of the contract and the unobservable period had more than an insignificant impact on the valuation, the commodity derivative is classified as Level 3. In isolation, increases (decreases) in natural gas forward prices result in favorable (unfavorable) fair value adjustments for natural gas purchase contracts; and increases (decreases) in electricity forward prices result in unfavorable (favorable) fair value adjustments for electricity sales contracts. Duke Energy regularly evaluates and validates pricing inputs used to estimate the fair value of natural gas commodity contracts by a market participant price verification procedure. This procedure provides a comparison of internal forward commodity curves to market participant generated curves. Interest rate derivatives Most over-the-counter interest rate contract derivatives are valued using financial models that utilize observable inputs for similar instruments and are classified as Level 2. Inputs include forward interest rate curves, notional amounts, interest rates and credit quality of the counterparties. Other fair value considerations See Note 12 in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2019, for a discussion of the valuation of goodwill and intangible assets. DUKE ENERGY The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 8 . See Note 9 for additional information related to investments by major security type for the Duke Energy Registrants. June 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 731 $ 731 $ — $ — $ — NDTF equity securities 5,039 4,991 — — 48 NDTF debt securities 2,230 336 1,894 — — Other equity securities 116 116 — — — Other debt securities 302 36 266 — — Other cash and cash equivalents 113 113 — — — Derivative assets 32 4 15 13 — Total assets 8,563 6,327 2,175 13 48 Derivative liabilities (361 ) (1 ) (255 ) (105 ) — Net assets (liabilities) $ 8,202 $ 6,326 $ 1,920 $ (92 ) $ 48 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 101 $ 101 $ — $ — $ — NDTF equity securities 5,684 5,633 — — 51 NDTF debt securities 2,368 725 1,643 — — Other equity securities 122 122 — — — Other debt securities 258 39 219 — — Other cash and cash equivalents 52 52 — — — Derivative assets 25 3 7 15 — Total assets 8,610 6,675 1,869 15 51 NDTF equity security contracts (23 ) — (23 ) — — Derivative liabilities (277 ) (15 ) (145 ) (117 ) — Net assets (liabilities) $ 8,310 $ 6,660 $ 1,701 $ (102 ) $ 51 The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (88 ) $ (115 ) $ (102 ) $ (113 ) Purchases, sales, issuances and settlements: Purchases 14 38 14 38 Settlements (6 ) (11 ) (15 ) (23 ) Total (losses) gains included on the Condensed Consolidated Balance Sheet (12 ) 9 11 19 Balance at end of period $ (92 ) $ (79 ) $ (92 ) $ (79 ) DUKE ENERGY CAROLINAS The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 30 $ 30 $ — $ — NDTF equity securities 2,989 2,941 — 48 NDTF debt securities 1,239 125 1,114 — Derivative assets 7 — 7 — Total assets 4,265 3,096 1,121 48 Derivative liabilities (57 ) — (57 ) — Net assets $ 4,208 $ 3,096 $ 1,064 $ 48 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 21 $ 21 $ — $ — NDTF equity securities 3,154 3,103 — 51 NDTF debt securities 1,172 206 966 — Total assets 4,347 3,330 966 51 Derivative liabilities (49 ) — (49 ) — Net assets $ 4,298 $ 3,330 $ 917 $ 51 PROGRESS ENERGY The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 701 $ 701 $ — $ 80 $ 80 $ — NDTF equity securities 2,050 2,050 — 2,530 2,530 — NDTF debt securities 991 211 780 1,196 519 677 Other debt securities 52 — 52 51 — 51 Other cash and cash equivalents 108 108 — 49 49 — Derivative assets 8 — 8 7 — 7 Total assets 3,910 3,070 840 3,913 3,178 735 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities (121 ) — (121 ) (65 ) — (65 ) Net assets $ 3,789 $ 3,070 $ 719 $ 3,825 $ 3,178 $ 647 DUKE ENERGY PROGRESS The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NTDF cash and cash equivalents $ 63 $ 63 $ — $ 53 $ 53 $ — NDTF equity securities 1,977 1,977 — 2,077 2,077 — NDTF debt securities 991 211 780 921 244 677 Other cash and cash equivalents 1 1 — 2 2 — Derivative assets 8 — 8 — — — Total assets 3,040 2,252 788 3,053 2,376 677 Derivative liabilities (105 ) — (105 ) (49 ) — (49 ) Net assets $ 2,935 $ 2,252 $ 683 $ 3,004 $ 2,376 $ 628 DUKE ENERGY FLORIDA The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 638 $ 638 $ — $ 27 $ 27 $ — NDTF equity securities 73 73 — 453 453 — NDTF debt securities — — — 275 275 — Other debt securities 52 — 52 51 — 51 Other cash and cash equivalents 2 2 — 4 4 — Derivative assets — — — 7 — 7 Total assets 765 713 52 817 759 58 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities — — — (1 ) — (1 ) Net assets $ 765 $ 713 $ 52 $ 793 $ 759 $ 34 DUKE ENERGY OHIO The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets were not material at June 30, 2020 , and December 31, 2019 . DUKE ENERGY INDIANA The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 77 $ 77 $ — $ — $ 81 $ 81 $ — $ — Other debt securities 45 — 45 — 44 — 44 — Derivative assets 10 — — 10 13 2 — 11 Total assets $ 132 $ 77 $ 45 $ 10 $ 138 $ 83 $ 44 $ 11 Derivative liabilities (1 ) (1 ) — — (1 ) (1 ) — — Net assets $ 131 $ 76 $ 45 $ 10 $ 137 $ 82 $ 44 $ 11 The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ 2 $ 5 $ 11 $ 22 Purchases, sales, issuances and settlements: Purchases 10 29 10 29 Settlements (4 ) (9 ) (10 ) (19 ) Total gains (losses) included on the Condensed Consolidated Balance Sheet 2 3 (1 ) (4 ) Balance at end of period $ 10 $ 28 $ 10 $ 28 PIEDMONT The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 3 Total Fair Value Level 1 Level 3 Derivative assets $ 4 $ 4 $ — $ 1 $ 1 $ — Derivative liabilities (105 ) — (105 ) (117 ) — (117 ) Net (liabilities) assets $ (101 ) $ 4 $ (105 ) $ (116 ) $ 1 $ (117 ) The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (91 ) $ (121 ) $ (117 ) $ (141 ) Total gains and settlements (14 ) 7 12 27 Balance at end of period $ (105 ) $ (114 ) $ (105 ) $ (114 ) QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. June 30, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 3 RTO auction pricing FTR price – per MWh $ 0.23 - $ 1.45 $ 0.69 Duke Energy Indiana FTRs 10 RTO auction pricing FTR price – per MWh (1.03 ) - 6.19 0.71 Piedmont Natural gas contracts (105 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.73 - 2.39 2.01 Duke Energy Total Level 3 derivatives $ (92 ) December 31, 2019 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 4 RTO auction pricing FTR price – per MWh $ 0.59 - $ 3.47 $ 2.07 Duke Energy Indiana FTRs 11 RTO auction pricing FTR price – per MWh (0.66 ) - 9.24 1.15 Piedmont Natural gas contracts (117 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.59 - 2.46 1.91 Duke Energy Total Level 3 derivatives $ (102 ) OTHER FAIR VALUE DISCLOSURES The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements. June 30, 2020 December 31, 2019 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 59,899 $ 68,428 $ 58,126 $ 63,062 Duke Energy Carolinas 12,521 15,046 11,900 13,516 Progress Energy 19,604 23,476 19,634 22,291 Duke Energy Progress 9,063 10,506 9,058 9,934 Duke Energy Florida 7,951 9,655 7,987 9,131 Duke Energy Ohio 3,019 3,551 2,619 2,964 Duke Energy Indiana 4,603 5,617 4,057 4,800 Piedmont 2,779 3,289 2,384 2,642 (a) Book value of long-term debt includes $1.4 billion at June 30, 2020 , and $1.5 billion at December 31, 2019 , of unamortized debt discount and premium, net of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt. At both June 30, 2020 , and December 31, 2019 , fair value of cash and cash equivalents, accounts and notes receivable, accounts payable, notes payable and commercial paper and nonrecourse notes payable of VIEs are not materially different from their carrying amounts because of the short-term nature of these instruments and/or because the stated rates approximate market rates.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2020
Variable Interest Entities [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES CONSOLIDATED VIEs The obligations of the consolidated VIEs discussed in the following paragraphs are nonrecourse to the Duke Energy Registrants. The registrants have no requirement to provide liquidity to, purchase assets of or guarantee performance of these VIEs unless noted in the following paragraphs. No financial support was provided to any of the consolidated VIEs during the six months ended June 30, 2020 , and the year ended December 31, 2019 , or is expected to be provided in the future that was not previously contractually required. Receivables Financing – DERF/DEPR/DEFR DERF, DEPR and DEFR are bankruptcy remote, special purpose subsidiaries of Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, respectively. DERF, DEPR and DEFR are wholly owned LLCs with separate legal existence from their parent companies, and their assets are not generally available to creditors of their parent companies. On a revolving basis, DERF, DEPR and DEFR buy certain accounts receivable arising from the sale of electricity and related services from their parent companies. DERF, DEPR and DEFR borrow amounts under credit facilities to buy these receivables. Borrowing availability from the credit facilities is limited to the amount of qualified receivables purchased which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligations is cash collections from the receivables. Amounts borrowed under the credit facilities for DERF and DEPR are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. Amounts borrowed under the credit facilities for DEFR are reflected on the Condensed Consolidated Balance Sheets as Current maturities of long-term debt. Due to the COVID-19 pandemic, as described in Note 1, the Duke Energy Registrants suspended customer disconnections for nonpayment. The full impact of COVID-19 and the Duke Energy Registrant’s related response on customers’ ability to pay for service is uncertain. However, the level of past-due receivables at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida have increased significantly during the COVID-19 pandemic, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. In the second quarter of 2020, DERF, DEPR and DEFR executed amendments to their credit facilities to manage the impact of past-due receivables resulting from the suspension of customer disconnections from COVID-19. See Note 3 for information about COVID-19 filings with state utility commissions. The most significant activity that impacts the economic performance of DERF, DEPR and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are considered the primary beneficiaries and consolidate DERF, DEPR and DEFR, respectively, as they make those decisions. Receivables Financing – CRC CRC is a bankruptcy remote, special purpose entity indirectly owned by Duke Energy. On a revolving basis, CRC buys certain accounts receivable arising from the sale of electricity, natural gas and related services from Duke Energy Ohio and Duke Energy Indiana. CRC borrows amounts under a credit facility to buy the receivables from Duke Energy Ohio and Duke Energy Indiana. Borrowing availability from the credit facility is limited to the amount of qualified receivables sold to CRC which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligation is cash collections from the receivables. Amounts borrowed under the credit facility are reflected on Duke Energy's Condensed Consolidated Balance Sheets as Long-Term Debt. The proceeds Duke Energy Ohio and Duke Energy Indiana receive from the sale of receivables to CRC are approximately 75% cash and 25% in the form of a subordinated note from CRC. The subordinated note is a retained interest in the receivables sold. Depending on collection experience, additional equity infusions to CRC may be required by Duke Energy to maintain a minimum equity balance of $3 million . Due to the COVID-19 pandemic, as described in Note 1, the Duke Energy Registrants suspended customer disconnections for nonpayment. The full impact of COVID-19 and the Duke Energy Registrant’s related response on customers’ ability to pay for service is uncertain. However, the level of past-due receivables at Duke Energy Ohio and Duke Energy Indiana have increased significantly during the COVID-19 pandemic, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. In July of 2020, CRC executed an amendment to its credit facility to manage the impact of past-due receivables resulting from the suspension of customer disconnections from COVID-19. See Note 3 for information about COVID-19 filings with state utility commissions. CRC is considered a VIE because (i) equity capitalization is insufficient to support its operations, (ii) power to direct the activities that most significantly impact the economic performance of the entity is not held by the equity holder and (iii) deficiencies in net worth of CRC are funded by Duke Energy. The most significant activities that impact the economic performance of CRC are decisions made to manage delinquent receivables. Duke Energy is considered the primary beneficiary and consolidates CRC as it makes these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidate CRC. Receivables Financing – Credit Facilities The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above. Duke Energy Duke Energy Duke Energy Duke Energy Carolinas Progress Florida (in millions) CRC DERF DEPR DEFR Expiration date February 2023 December 2022 April 2023 April 2021 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at June 30, 2020 350 475 333 250 Amounts borrowed at December 31, 2019 350 474 325 250 Restricted Receivables at June 30, 2020 454 675 451 463 Restricted Receivables at December 31, 2019 522 642 489 336 Nuclear Asset-Recovery Bonds – DEFPF DEFPF is a bankruptcy remote, wholly owned special purpose subsidiary of Duke Energy Florida. DEFPF was formed in 2016 for the sole purpose of issuing nuclear asset-recovery bonds to finance Duke Energy Florida's unrecovered regulatory asset related to Crystal River Unit 3. In 2016, DEFPF issued senior secured bonds and used the proceeds to acquire nuclear asset-recovery property from Duke Energy Florida. The nuclear asset-recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable nuclear asset-recovery charge from all Duke Energy Florida retail customers until the bonds are paid in full and all financing costs have been recovered. The nuclear asset-recovery bonds are secured by the nuclear asset-recovery property and cash collections from the nuclear asset-recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Florida. DEFPF is considered a VIE primarily because the equity capitalization is insufficient to support its operations. Duke Energy Florida has the power to direct the significant activities of the VIE as described above and therefore Duke Energy Florida is considered the primary beneficiary and consolidates DEFPF. The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets. (in millions) June 30, 2020 December 31, 2019 Receivables of VIEs $ 6 $ 5 Regulatory Assets: Current 53 52 Current Assets: Other 32 39 Other Noncurrent Assets: Regulatory assets 969 989 Current Liabilities: Other 10 10 Current maturities of long-term debt 54 54 Long-Term Debt 1,028 1,057 Commercial Renewables Certain of Duke Energy’s renewable energy facilities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Assets are restricted and cannot be pledged as collateral or sold to third parties without prior approval of debt holders. Additionally, Duke Energy has VIEs associated with tax equity arrangements entered into with third-party investors in order to finance the cost of renewable assets eligible for tax credits. The activities that most significantly impacted the economic performance of these renewable energy facilities were decisions associated with siting, negotiating PPAs and Engineering, Procurement and Construction agreements, and decisions associated with ongoing operations and maintenance-related activities. Duke Energy is considered the primary beneficiary and consolidates the entities as it is responsible for all of these decisions. The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs. (in millions) June 30, 2020 December 31, 2019 Current Assets: Other $ 228 $ 203 Property, Plant and Equipment: Cost 6,198 5,747 Accumulated depreciation and amortization (1,145 ) (1,041 ) Other Noncurrent Assets: Other 75 106 Current maturities of long-term debt 158 162 Long-Term Debt 1,457 1,541 Other Noncurrent Liabilities: AROs 144 127 Other Noncurrent Liabilities: Other 251 228 NON-CONSOLIDATED VIEs The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets. June 30, 2020 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 34 $ 49 Investments in equity method unconsolidated affiliates — 413 1 414 — — Deferred tax asset 439 — — 439 — — Total assets $ 439 $ 412 $ 1 $ 852 $ 34 $ 49 Taxes accrued 9 — — 9 — — Other current liabilities 920 — 4 924 — — Other noncurrent liabilities — — 10 10 — — Total liabilities $ 929 $ — $ 14 $ 943 $ — $ — Net (liabilities) assets $ (490 ) $ 412 $ (13 ) $ (91 ) $ 34 $ 49 December 31, 2019 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 64 $ 77 Investments in equity method unconsolidated affiliates 1,179 300 — 1,479 — — Total assets $ 1,179 $ 299 $ — $ 1,478 $ 64 $ 77 Taxes accrued (1 ) — — (1 ) — — Other current liabilities — — 4 4 — — Deferred income taxes 59 — — 59 — — Other noncurrent liabilities — — 11 11 — — Total liabilities $ 58 $ — $ 15 $ 73 $ — $ — Net assets (liabilities) $ 1,121 $ 299 $ (15 ) $ 1,405 $ 64 $ 77 The Duke Energy Registrants are not aware of any situations where the maximum exposure to loss significantly exceeds the carrying values shown above except for the PPA with OVEC, which is discussed below, and future exit costs associated with the abandonment of the investment in ACP, as discussed below. Pipeline Investments Duke Energy has investments in various joint ventures to construct and operate pipeline projects. These entities are considered VIEs due to having insufficient equity to finance their own activities without subordinated financial support. Duke Energy does not have the power to direct the activities that most significantly impact the economic performance, the obligation to absorb losses or the right to receive benefits of these VIEs and therefore does not consolidate these entities. On July 5, 2020, Duke Energy determined that it would no longer invest in the construction of the ACP pipeline. See Notes 1, 3 and 4 for further information regarding this transaction. For the three and six months ended June 30, 2020 , the ACP investment is considered a significant subsidiary because its income exceeds 20% of Duke Energy’s income. The table below presents unaudited summarized financial information for ACP. Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Net (Loss) Income $ (4,414 ) $ 61 $ (4,342 ) $ 114 The table below presents Duke Energy's ownership interest and investment balances in these joint ventures. VIE Investment Amount (in millions) Ownership June 30, December 31, Entity Name Interest 2020 2019 ACP (a) 47 % $ (920 ) $ 1,179 Constitution (b) 24 % — — Total $ (920 ) $ 1,179 (a) During the quarter ended June 30, 2020, Duke Energy abandoned its investment in ACP as described above. The current liability related to the abandonment of ACP represents Duke Energy's obligation to fund ACP's obligations. See Notes 1, 3 and 4 for more information. (b) During the year ended December 31, 2019, Duke Energy recorded an other-than-temporary impairment related to Constitution. This charge resulted in the full write-down of Duke Energy's investment in Constitution. Commercial Renewables Duke Energy has investments in various renewable energy project entities. Some of these entities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Duke Energy does not consolidate these VIEs because power to direct and control key activities is shared jointly by Duke Energy and other owners. Other In 2019, Duke Energy acquired a majority ownership in a portfolio of distributed fuel cell projects from Bloom Energy Corporation. Duke Energy is not the primary beneficiary of the assets within the portfolio and does not consolidate the assets in the portfolio. OVEC Duke Energy Ohio’s 9% ownership interest in OVEC is considered a non-consolidated VIE due to OVEC having insufficient equity to finance its activities without subordinated financial support. The activities that most significantly impact OVEC's economic performance include fuel strategy and supply activities and decisions associated with ongoing operations and maintenance-related activities. Duke Energy Ohio does not have the unilateral power to direct these activities, and therefore, does not consolidate OVEC. As a counterparty to an Inter-Company Power Agreement (ICPA), Duke Energy Ohio has a contractual arrangement to receive entitlements to capacity and energy from OVEC’s power plants through June 2040 commensurate with its power participation ratio, which is equivalent to Duke Energy Ohio's ownership interest. Costs, including fuel, operating expenses, fixed costs, debt amortization and interest expense, are allocated to counterparties to the ICPA based on their power participation ratio. The value of the ICPA is subject to variability due to fluctuation in power prices and changes in OVEC's cost of business. On March 31, 2018, FirstEnergy Solutions Corp (FES), a subsidiary of FirstEnergy Corp. and an ICPA counterparty with a power participation ratio of 4.85% , filed for Chapter 11 bankruptcy, which could increase costs allocated to the counterparties. On July 31, 2018, the bankruptcy court rejected the FES ICPA, which means OVEC is an unsecured creditor in the FES bankruptcy proceeding. In addition, certain proposed environmental rulemaking could result in future increased OVEC cost allocations. In July 2020, legislation was proposed to repeal HB 6. Duke Energy cannot predict the outcome in this matter. See Note 3 for additional information. CRC See discussion under Consolidated VIEs for additional information related to CRC. Amounts included in Receivables from affiliated companies in the above table for Duke Energy Ohio and Duke Energy Indiana reflect their retained interest in receivables sold to CRC. These subordinated notes held by Duke Energy Ohio and Duke Energy Indiana are stated at fair value. The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana (in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Receivables sold $ 221 $ 253 $ 280 $ 307 Less: Retained interests 34 64 49 77 Net receivables sold $ 187 $ 189 $ 231 $ 230 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, (in millions) 2020 2019 2020 2019 2020 2019 2020 2019 Sales Receivables sold $ 429 $ 429 $ 966 $ 1,004 $ 583 $ 676 $ 1,230 $ 1,410 Loss recognized on sale 2 3 6 7 2 4 6 9 Cash flows Cash proceeds from receivables sold $ 431 $ 448 $ 990 $ 1,045 $ 580 $ 680 $ 1,252 $ 1,438 Return received on retained interests — 2 2 4 1 2 3 5 Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Duke Energy earns substantially all of its revenues through its reportable segments, Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables. Electric Utilities and Infrastructure Electric Utilities and Infrastructure earns the majority of its revenues through retail and wholesale electric service through the generation, transmission, distribution and sale of electricity. Duke Energy generally provides retail and wholesale electric service customers with their full electric load requirements or with supplemental load requirements when the customer has other sources of electricity. The majority of wholesale revenues are full requirements contracts where the customers purchase the substantial majority of their energy needs and do not have a fixed quantity of contractually required energy or capacity. As such, related forecasted revenues are considered optional purchases. Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations: Remaining Performance Obligations (in millions) 2020 2021 2022 2023 2024 Thereafter Total Progress Energy $ 58 $ 92 $ 94 $ 44 $ 45 $ 58 $ 391 Duke Energy Progress 4 8 8 8 8 — 36 Duke Energy Florida 54 84 86 36 37 58 355 Duke Energy Indiana 5 5 — — — — 10 Revenues for block sales are recognized monthly as energy is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Gas Utilities and Infrastructure Gas Utilities and Infrastructure earns its revenues through retail and wholesale natural gas service through the transportation, distribution and sale of natural gas. Duke Energy generally provides retail and wholesale natural gas service customers with all natural gas load requirements. Additionally, while natural gas can be stored, substantially all natural gas provided by Duke Energy is consumed by customers simultaneously with receipt of delivery. Fixed-capacity payments under long-term contracts for the Gas Utilities and Infrastructure segment include minimum margin contracts and supply arrangements with municipalities and power generation facilities. Revenues for related sales are recognized monthly as natural gas is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Estimated remaining performance obligations are as follows: Remaining Performance Obligations (in millions) 2020 2021 2022 2023 2024 Thereafter Total Piedmont $ 34 $ 65 $ 64 $ 61 $ 58 $ 376 $ 658 Commercial Renewables Commercial Renewables earns the majority of its revenues through long-term PPAs and generally sells all of its wind and solar facility output, electricity and Renewable Energy Certificates (RECs) to customers. The majority of these PPAs have historically been accounted for as leases. For PPAs that are not accounted for as leases, the delivery of electricity and the delivery of RECs are considered separate performance obligations. Other The remainder of Duke Energy’s operations is presented as Other, which does not include material revenues from contracts with customers. Disaggregated Revenues Disaggregated revenues are presented as follows: Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 2,249 $ 677 $ 1,173 $ 460 $ 713 $ 169 $ 231 $ — General 1,379 507 611 298 313 103 161 — Industrial 658 260 212 154 58 33 152 — Wholesale 435 101 285 240 45 5 44 — Other revenues 284 62 191 70 121 19 25 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 5,005 $ 1,607 $ 2,472 $ 1,222 $ 1,250 $ 329 $ 613 $ — Gas Utilities and Infrastructure Residential $ 157 $ — $ — $ — $ — $ 62 $ — $ 96 Commercial 75 — — — — 23 — 52 Industrial 27 — — — — 3 — 22 Power Generation — — — — — — — 6 Other revenues 12 — — — — 3 — 11 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 271 $ — $ — $ — $ — $ 91 $ — $ 187 Commercial Renewables Revenue from contracts with customers $ 55 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 5,338 $ 1,607 $ 2,472 $ 1,222 $ 1,250 $ 420 $ 613 $ 187 Other revenue sources (a) $ 83 $ 3 $ 26 $ 21 $ — $ 3 $ 4 $ 10 Total revenues $ 5,421 $ 1,610 $ 2,498 $ 1,243 $ 1,250 $ 423 $ 617 $ 197 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Three Months Ended June 30, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 2,304 $ 679 $ 1,243 $ 496 $ 747 $ 159 $ 225 $ — General 1,584 531 750 339 411 105 197 — Industrial 759 289 231 164 67 36 201 — Wholesale 527 109 351 309 42 9 59 — Other revenues 187 68 99 44 55 25 27 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 5,361 $ 1,676 $ 2,674 $ 1,352 $ 1,322 $ 334 $ 709 $ — Gas Utilities and Infrastructure Residential $ 146 $ — $ — $ — $ — $ 64 $ — $ 82 Commercial 85 — — — — 26 — 59 Industrial 29 — — — — 3 — 24 Power Generation — — — — — — — 13 Other revenues 22 — — — — 2 — 19 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 282 $ — $ — $ — $ — $ 95 $ — $ 197 Commercial Renewables Revenue from contracts with customers $ 46 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 6 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 5,695 $ 1,676 $ 2,674 $ 1,352 $ 1,322 $ 429 $ 709 $ 197 Other revenue sources (a) $ 178 $ 37 $ 70 $ 35 $ 31 $ 4 $ 5 $ 12 Total revenues $ 5,873 $ 1,713 $ 2,744 $ 1,387 $ 1,353 $ 433 $ 714 $ 209 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 4,515 $ 1,433 $ 2,242 $ 962 $ 1,280 $ 345 $ 496 $ — General 2,887 1,056 1,275 617 658 217 342 — Industrial 1,351 529 428 308 120 68 327 — Wholesale 932 215 606 519 87 12 99 — Other revenues 475 122 309 133 176 39 41 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 10,160 $ 3,355 $ 4,860 $ 2,539 $ 2,321 $ 681 $ 1,305 $ — Gas Utilities and Infrastructure Residential $ 519 $ — $ — $ — $ — $ 159 $ — $ 360 Commercial 244 — — — — 66 — 178 Industrial 68 — — — — 9 — 58 Power Generation — — — — — — — 17 Other revenues 42 — — — — 9 — 35 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 873 $ — $ — $ — $ — $ 243 $ — $ 648 Commercial Renewables Revenue from contracts with customers $ 113 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 13 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 11,159 $ 3,355 $ 4,860 $ 2,539 $ 2,321 $ 924 $ 1,305 $ 648 Other revenue sources (a) $ 211 $ 3 $ 60 $ 42 $ 9 $ (3 ) $ 4 $ 61 Total revenues $ 11,370 $ 3,358 $ 4,920 $ 2,581 $ 2,330 $ 921 $ 1,309 $ 709 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Six Months Ended June 30, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 4,674 $ 1,439 $ 2,357 $ 1,032 $ 1,325 $ 348 $ 531 $ — General 3,011 1,027 1,382 645 737 208 394 — Industrial 1,470 555 453 325 128 69 391 — Wholesale 1,068 228 704 624 80 23 113 — Other revenues 359 146 271 169 102 41 44 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 10,582 $ 3,395 $ 5,167 $ 2,795 $ 2,372 $ 689 $ 1,473 $ — Gas Utilities and Infrastructure Residential $ 560 $ — $ — $ — $ — $ 176 $ — $ 384 Commercial 291 — — — — 75 — 216 Industrial 77 — — — — 10 — 66 Power Generation — — — — — — — 26 Other revenues 85 — — — — 10 — 75 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,013 $ — $ — $ — $ — $ 271 $ — $ 767 Commercial Renewables Revenue from contracts with customers $ 88 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 10 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 11,693 $ 3,395 $ 5,167 $ 2,795 $ 2,372 $ 960 $ 1,473 $ 767 Other revenue sources (a) $ 343 $ 62 $ 149 $ 76 $ 67 $ 4 $ 9 $ 21 Total revenues $ 12,036 $ 3,457 $ 5,316 $ 2,871 $ 2,439 $ 964 $ 1,482 $ 788 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. As described in Note 1 , Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard. Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at March 31, 2020 $ 89 $ 11 $ 20 $ 9 $ 11 $ 5 $ 3 $ 9 Write-Offs (9 ) (3 ) (3 ) (3 ) — — — (4 ) Credit Loss Expense 15 6 12 8 3 — — 1 Other Adjustments 7 — — — — — — — Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6 Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 76 $ 10 $ 16 $ 8 $ 7 $ 4 $ 3 $ 6 Cumulative Change in Accounting Principle 5 1 2 1 1 — — 1 Write-Offs (19 ) (6 ) (7 ) (5 ) (2 ) — — (5 ) Credit Loss Expense 33 9 18 10 8 1 — 4 Other Adjustments 7 — — — — — — — Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6 Trade and other receivables are evaluated based on an estimate of the risk of loss over the life of the receivable and current and historical conditions using supportable assumptions. Management evaluates the risk of loss for trade and other receivables by comparing the historical write-off amounts to total revenue over a specified period. Historical loss rates are adjusted due to the impact of current conditions, including the impacts of COVID-19, as well as forecasted conditions over a reasonable time period. The calculated write-off rate can be applied to the receivable balance for which an established reserve does not already exist. Management reviews the assumptions and risk of loss periodically for trade and other receivables. Due to the COVID-19 pandemic, as described in Note 1 , the Duke Energy Registrants suspended customer disconnections for nonpayment. The specific actions taken by each Duke Energy Registrant are described in Note 3 . The impact of COVID-19 and Duke Energy’s related response on customers’ ability to pay for service is uncertain, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables $ 829 $ 332 $ 274 $ 137 $ 137 $ 1 $ 7 $ 6 0-30 days 1,624 470 685 336 344 48 28 73 30-60 days 152 49 56 28 28 6 1 6 60-90 days 90 29 34 17 17 4 1 5 90+ days 209 64 53 24 29 29 10 18 Trade and Other Receivables $ 2,904 $ 944 $ 1,102 $ 542 $ 555 $ 88 $ 47 $ 108 UNBILLED REVENUE Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns, customer mix, average price in effect for customer classes, timing of rendering customer bills and meter reading schedules and the impact of weather normalization or margin decoupling mechanisms. Unbilled revenues are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets as shown in the following table. (in millions) June 30, 2020 December 31, 2019 Duke Energy $ 829 $ 843 Duke Energy Carolinas 332 298 Progress Energy 274 217 Duke Energy Progress 137 122 Duke Energy Florida 137 95 Duke Energy Ohio 1 1 Duke Energy Indiana 7 16 Piedmont 6 78 Additionally, Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 11 for further information. These receivables for unbilled revenues are shown in the table below. (in millions) June 30, 2020 December 31, 2019 Duke Energy Ohio $ 68 $ 82 Duke Energy Indiana 106 115

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as stock options and equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS. The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared. Three Months Ended June 30, Six Months Ended June 30, (in millions, except per share amounts) 2020 2019 2020 2019 Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities $ (817 ) $ 819 $ 82 $ 1,718 Accumulated preferred stock dividends (12 ) — — — Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities and including accumulated preferred stock dividends $ (829 ) $ 819 $ 82 $ 1,718 Weighted average common shares outstanding – basic 735 728 734 728 Equity forwards — — 1 — Weighted average common shares outstanding – diluted 735 728 735 728 Earnings (Loss) Per Share available to Duke Energy common stockholders Basic and diluted $ (1.13 ) $ 1.12 $ 0.11 $ 2.36 Potentially dilutive items excluded from the calculation (a) 2 2 2 2 Dividends declared per common share $ 0.945 $ 0.928 $ 1.890 $ 1.855 Dividends declared on Series A preferred stock per depositary share (b) $ 0.359 $ 0.307 $ 0.719 $ 0.307 Dividends declared on Series B preferred stock per share (c) $ — $ — $ 24.917 $ — (a) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met. (b) 5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share. (c) 4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share. Common Stock In November 2019, Duke Energy filed a prospectus supplement and executed an Equity Distribution Agreement (EDA) under which it may sell up to $1.5 billion of its common stock through an at-the-market (ATM) offering program, including an equity forward sales component. Under the terms of the EDA, Duke Energy may issue and sell shares of common stock through September 2022. In March 2020, Duke Energy marketed approximately 940,000 shares of common stock through an equity forward transaction under the ATM with an initial forward price of $89.76 per share. In May 2020, Duke Energy marketed approximately 903,000 shares of common stock through an equity forward transaction under the ATM with an initial forward price of $82.44 per share. Separately, in November 2019, Duke Energy marketed an equity offering of 28.75 million shares of common stock through an Underwriting Agreement. In connection with the offering, Duke Energy entered into an equity forward sales agreement with an initial forward price of $85.99 per share. The equity forward sales agreements require Duke Energy to either physically settle the transaction by issuing shares in exchange for net proceeds at the then-applicable forward sale price specified by the agreement, or net settle in whole or in part through the delivery or receipt of cash or shares. The settlement alternatives are at Duke Energy's election. Settlement of the forward sales agreements are expected to occur on or prior to December 31, 2020. Until settlement of the equity forwards, EPS dilution resulting from the agreements, if any, will be determined under the treasury stock method.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS DEFINED BENEFIT RETIREMENT PLANS Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants. QUALIFIED PENSION PLANS The following tables include the components of net periodic pension costs for qualified pension plans. Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 42 $ 14 $ 12 $ 8 $ 6 $ 1 $ 2 $ 2 Interest cost on projected benefit obligation 68 15 22 9 11 4 5 3 Expected return on plan assets (143 ) (36 ) (47 ) (22 ) (26 ) (7 ) (10 ) (6 ) Amortization of actuarial loss 30 7 9 4 5 1 3 3 Amortization of prior service credit (8 ) (2 ) (1 ) (1 ) (1 ) — (1 ) (3 ) Amortization of settlement charges 3 1 — 1 — — — — Net periodic pension costs $ (8 ) $ (1 ) $ (5 ) $ (1 ) $ (5 ) $ (1 ) $ (1 ) $ (1 ) Three Months Ended June 30, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 37 $ 12 $ 10 $ 6 $ 6 $ 1 $ 2 $ 2 Interest cost on projected benefit obligation 82 21 26 12 13 4 7 3 Expected return on plan assets (143 ) (37 ) (45 ) (21 ) (22 ) (6 ) (10 ) (6 ) Amortization of actuarial loss 25 5 9 3 6 — 1 1 Amortization of prior service credit (8 ) (2 ) — (1 ) (1 ) — (1 ) (2 ) Net periodic pension costs $ (7 ) $ (1 ) $ — $ (1 ) $ 2 $ (1 ) $ (1 ) $ (2 ) Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 83 $ 26 $ 24 $ 14 $ 11 $ 2 $ 4 $ 3 Interest cost on projected benefit obligation 135 31 43 19 23 8 11 5 Expected return on plan assets (286 ) (72 ) (95 ) (44 ) (51 ) (14 ) (21 ) (11 ) Amortization of actuarial loss 64 14 20 9 11 3 6 5 Amortization of prior service credit (16 ) (4 ) (2 ) (1 ) (1 ) — (1 ) (5 ) Amortization of settlement charges 5 2 1 1 — — — — Net periodic pension costs $ (15 ) $ (3 ) $ (9 ) $ (2 ) $ (7 ) $ (1 ) $ (1 ) $ (3 ) Six Months Ended June 30, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 74 $ 24 $ 21 $ 12 $ 10 $ 2 $ 4 $ 3 Interest cost on projected benefit obligation 165 41 52 24 27 9 13 6 Expected return on plan assets (286 ) (75 ) (89 ) (44 ) (44 ) (14 ) (21 ) (11 ) Amortization of actuarial loss 49 11 18 6 12 1 3 3 Amortization of prior service credit (16 ) (4 ) (1 ) (1 ) (1 ) — (1 ) (5 ) Net periodic pension costs $ (14 ) $ (3 ) $ 1 $ (3 ) $ 4 $ (2 ) $ (2 ) $ (4 ) NON-QUALIFIED PENSION PLANS Net periodic pension costs for non-qualified pension plans were not material for the three and six months ended June 30, 2020, and 2019. OTHER POST-RETIREMENT BENEFIT PLANS Net periodic costs for OPEB plans were not material for the three and six months ended June 30, 2020, and 2019.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES EFFECTIVE TAX RATES The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table. Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Duke Energy 26.2 % 15.9 % 98.9 % 12.6 % Duke Energy Carolinas 13.7 % 19.7 % 15.1 % 18.7 % Progress Energy 14.9 % 16.7 % 16.1 % 17.0 % Duke Energy Progress 13.9 % 16.3 % 15.7 % 17.1 % Duke Energy Florida 19.1 % 19.6 % 19.4 % 19.5 % Duke Energy Ohio 15.4 % 16.1 % 16.6 % 16.5 % Duke Energy Indiana 17.3 % 24.2 % 19.3 % 24.2 % Piedmont 128.6 % 22.2 % 5.8 % 21.8 % The increase in the ETR for Duke Energy for the three and six months ended June 30, 2020 , was primarily due to the impact of an abandonment of the ACP investment and an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy Carolinas for the three months ended June 30, 2020, was primarily due to an increase in the amortization of excess deferred taxes and certain favorable tax credits. The decrease in the ETR for Duke Energy Carolinas for the six months ended June 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Progress Energy for the three months ended June 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy Progress for the three and six months ended June 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy Indiana for the three and six months ended June 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The increase in the ETR for Piedmont for the three months ended June 30, 2020, was primarily due to an increase in AFUDC Equity, in relation to pretax losses. The decrease in the ETR for Piedmont for the six months ended June 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes and an increase in AFUDC equity. OTHER TAX MATTERS On March 27, 2020, the CARES Act was enacted. The CARES Act is an emergency economic stimulus package in response to the COVID-19 pandemic. Among other provisions, the CARES Act accelerates the remaining AMT credit refund allowances resulting in taxpayers being able to immediately claim a refund in full for any AMT credit carryforwards. As a result, the remaining AMT credit carryforwards were reclassified in the first quarter 2020 to a current receivable included in Other within Current Assets on the Condensed Consolidated Balance Sheets. The total income tax receivable related to AMT credit carryforwards is approximately $572 million as of June 30, 2020 . The other provisions within the CARES Act do not materially impact Duke Energy's income tax accounting. See Note 1 for information on COVID-19.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS For information on subsequent events related to regulatory matters and variable interest entities, see Notes 3 and 11.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policy)	6 Months Ended
	Jun. 30, 2020
Policy Text Block [Line Items]
Basis of Presentation	BASIS OF PRESENTATION These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2019 . The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. These Condensed Consolidated Financial Statements, in the opinion of the respective companies’ management, reflect all normal recurring adjustments necessary to fairly present the financial position and results of operations of each of the Duke Energy Registrants. Amounts reported in Duke Energy’s interim Condensed Consolidated Statements of Operations and each of the Subsidiary Registrants’ interim Condensed Consolidated Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to effects of seasonal temperature variations on energy consumption, regulatory rulings, timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
Basis of Consolidation and Noncontrolling Interest	BASIS OF CONSOLIDATION These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 11 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. COVID-19 The COVID-19 pandemic is having a significant impact on global health and economic environments. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and President Trump proclaimed that the COVID-19 outbreak in the United States constitutes a national emergency. The extent to which the COVID-19 pandemic will impact the Duke Energy Registrants during 2020 and beyond is uncertain, and the Duke Energy Registrants are monitoring developments closely. The company incurred approximately $34 million and $40 million of incremental COVID-19 costs for the three and six months ended June 30, 2020 , respectively, included in Operation, maintenance and other on the Condensed Consolidated Statements of Operations. These costs were primarily bad debt expense, personal protective equipment and cleaning supplies. Further the company experienced approximately another $25 million of waived late payment fees for the three and six months ended June 30, 2020 . See Notes 3 , 5 , 11 , 12 and 15 for additional information as well as steps taken to mitigate the impacts to our business and customers from the COVID-19 pandemic. OTHER CURRENT ASSETS Included in Other within Current Assets on the Piedmont Condensed Consolidated Balance Sheets are income taxes receivable of $22 million and $14 million as of June 30, 2020, and December 31, 2019, respectively, and prepaid assets of $19 million and $3 million as of June 30, 2020, and December 31, 2019, respectively. The income taxes receivable relates to increases of net operating losses for Piedmont and intercompany tax settlements. The prepaid assets relate to natural gas storage injections and inventory transfers classified as prepaid assets until winter season when the gas is moved to Inventory on the Piedmont Condensed Consolidated Balance Sheets under certain agreements. OTHER CURRENT LIABILITIES During the second quarter of 2020, Duke Energy recorded a current liability related to the abandonment of ACP within Current Liabilities in the Gas Utilities and Infrastructure segment. The liability represents Duke Energy's obligation to fund ACP's obligations of outstanding debt and satisfy ARO requirements to restore construction sites. As a result, Liabilities associated with unconsolidated affiliates is $920 million , and exceeds 5% of Total current liabilities on the Duke Energy Condensed Consolidated Balance Sheets as of June 30, 2020 . See Notes 3 , 4 and 11 for further information. NONCONTROLLING INTEREST Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Condensed Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the Hypothetical Liquidation at Book Value (HLBV) method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period. The following table presents cash received for the sale of noncontrolling interest to tax equity members and allocated losses to noncontrolling tax equity members utilizing the HLBV method for the three and six months ended June 30, 2020 , and 2019 . Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Cash received for the sale of noncontrolling interest to tax equity members $ 60 $ 187 $ 163 $ 193 Allocated losses to noncontrolling tax equity members utilizing the HLBV method 79 83 128 90 Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares .
Cash, Cash Equivalents, and Restricted Cash	CASH, CASH EQUIVALENTS AND RESTRICTED CASH Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 9 and 11
New Accounting Standards	NEW ACCOUNTING STANDARDS The following new accounting standard was adopted by the Duke Energy Registrants in 2020 . Current Expected Credit Losses. In June 2016, the Financial Accounting Standards Board (FASB) issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients. Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables. Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators. Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of new credit loss standard, for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 12 for more information. Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below: January 1, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Florida Piedmont Total pretax impact to Retained Earnings $ 120 $ 16 $ 2 $ 1 $ 1 $ 1 The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of June 30, 2020 . Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates by the end of 2021. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022. Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond 2021 may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond 2021. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.
Environmental Costs	Liabilities are recorded when losses become probable and are reasonably estimable.Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable.
Derivatives	For the Subsidiary Registrants, bulk power electricity and coal and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Condensed Consolidated Statements of Operations and Comprehensive Income.
Investments	Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings.As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate.
Revenue from Contract with Customer	Additionally, Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. UNBILLED REVENUE Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns, customer mix, average price in effect for customer classes, timing of rendering customer bills and meter reading schedules and the impact of weather normalization or margin decoupling mechanisms.
Earnings Per Share	Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as stock options and equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS.

Organization and Basis of Pre_3

Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest	The following table presents cash received for the sale of noncontrolling interest to tax equity members and allocated losses to noncontrolling tax equity members utilizing the HLBV method for the three and six months ended June 30, 2020 , and 2019 . Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Cash received for the sale of noncontrolling interest to tax equity members $ 60 $ 187 $ 163 $ 193 Allocated losses to noncontrolling tax equity members utilizing the HLBV method 79 83 128 90
Schedule of Cash, Cash Equivalents and Restricted Cash	The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 Duke Duke Duke Progress Energy Duke Progress Energy Energy Energy Florida Energy Energy Florida Current Assets Cash and cash equivalents $ 341 $ 78 $ 20 $ 311 $ 48 $ 17 Other 193 31 31 222 39 39 Other Noncurrent Assets Other 107 102 — 40 39 — Total cash, cash equivalents and restricted cash $ 641 $ 211 $ 51 $ 573 $ 126 $ 56
Schedule of Utility Inventory	The components of inventory are presented in the tables below. June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,220 $ 769 $ 1,014 $ 682 $ 333 $ 83 $ 254 $ 5 Coal 776 271 257 189 68 13 234 — Natural gas, oil and other fuel 293 40 195 109 85 33 1 24 Total inventory $ 3,289 $ 1,080 $ 1,466 $ 980 $ 486 $ 129 $ 489 $ 29 December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,297 $ 768 $ 1,038 $ 686 $ 351 $ 79 $ 318 $ 5 Coal 586 187 186 138 48 15 198 — Natural gas, oil and other fuel 349 41 199 110 90 41 1 67 Total inventory $ 3,232 $ 996 $ 1,423 $ 934 $ 489 $ 135 $ 517 $ 72
Schedule of New Accounting Pronouncements	Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below: January 1, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Florida Piedmont Total pretax impact to Retained Earnings $ 120 $ 16 $ 2 $ 1 $ 1 $ 1

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting Information [Line Items]
Business Segment Data	Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Three Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 5,026 $ 265 $ 123 $ 5,414 $ 7 $ — $ 5,421 Intersegment revenues 8 24 — 32 19 (51 ) — Total revenues $ 5,034 $ 289 $ 123 $ 5,446 $ 26 $ (51 ) $ 5,421 Segment income (loss) (a) $ 753 $ (1,576 ) $ 90 $ (733 ) $ (84 ) $ — $ (817 ) Less: Noncontrolling interests (c) 90 Add: Preferred stock dividend 15 Net Loss $ (892 ) Segment assets $ 136,724 $ 13,072 $ 6,386 $ 156,182 $ 3,874 $ (7 ) $ 160,049 Three Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 5,467 $ 282 $ 118 $ 5,867 $ 6 $ — $ 5,873 Intersegment revenues 8 24 — 32 19 (51 ) — Total revenues $ 5,475 $ 306 $ 118 $ 5,899 $ 25 $ (51 ) $ 5,873 Segment income (loss) $ 809 $ 40 $ 86 $ 935 $ (115 ) $ — $ 820 Less: Noncontrolling interests (c) 84 Add: Preferred stock dividend 12 Net Income $ 748 Six Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 10,200 $ 905 $ 252 $ 11,357 $ 13 $ — $ 11,370 Intersegment revenues 17 48 — 65 36 (101 ) — Total revenues $ 10,217 $ 953 $ 252 $ 11,422 $ 49 $ (101 ) $ 11,370 Segment income (loss) (a)(b) $ 1,458 $ (1,327 ) $ 147 $ 278 $ (196 ) $ — $ 82 Less: Noncontrolling interests (c) 138 Add: Preferred stock dividend 54 Net Loss $ (2 ) Six Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 10,788 $ 1,014 $ 224 $ 12,026 $ 10 $ — $ 12,036 Intersegment revenues 16 48 — 64 36 (100 ) — Total revenues $ 10,804 $ 1,062 $ 224 $ 12,090 $ 46 $ (100 ) $ 12,036 Segment income (loss) $ 1,559 $ 266 $ 99 $ 1,924 $ (204 ) $ — $ 1,720 Less: Noncontrolling interests (c) 91 Add: Preferred stock dividend 12 Net Income $ 1,641 (a) Gas Utilities and Infrastructure includes $2.0 billion of pretax costs related to the abandonment of its ACP investment recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations. See Notes 1, 3 and Note 11 for additional information. (b) Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to the partial settlement of the Duke Energy Carolina's 2019 North Carolina rate case. See Note 3 for additional information. (c) Includes the allocation of losses to noncontrolling tax equity members. See Note 1 for additional information.
Duke Energy Ohio
Segment Reporting Information [Line Items]
Business Segment Data	Three Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 330 $ 93 $ 423 $ — $ — $ 423 Segment income/Net (loss) income $ 44 $ 23 $ 67 $ (1 ) $ — $ 66 Segment assets $ 6,378 $ 3,213 $ 9,591 $ 26 $ (8 ) $ 9,609 Three Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 336 $ 97 $ 433 $ — $ 433 Segment income/Net (loss) income $ 31 $ 17 $ 48 $ (1 ) $ 47 Six Months Ended June 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 676 $ 245 $ 921 $ — $ 921 Segment income/Net (loss) income $ 74 $ 59 $ 133 $ (2 ) $ 131 Six Months Ended June 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 691 $ 273 $ 964 $ — $ 964 Segment income/Net (loss) income $ 67 $ 52 $ 119 $ (3 ) $ 116

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2020
Regulated Operations [Abstract]
Schedule of Potential Plant Retirements	The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Condensed Consolidated Balance Sheets as of June 30, 2020 , and exclude capitalized asset retirement costs. Remaining Net Capacity Book Value (in MW) (in millions) Duke Energy Carolinas Allen Steam Station Units 1-3 (a) 585 $ 145 Duke Energy Indiana Gallagher Units 2 and 4 (b) 280 116 Gibson Units 1-5 (c) 3,132 1,690 Cayuga Units 1-2 (c) 1,005 953 Total Duke Energy 5,002 $ 2,904 (a) Duke Energy Carolinas will retire Allen Steam Station units 1 through 3 by December 31, 2024, as part of the resolution of a lawsuit involving alleged New Source Review violations. (b) Duke Energy Indiana committed to either retire or stop burning coal at Gallagher units 2 and 4 by December 31, 2022, as part of the 2016 settlement of Edwardsport IGCC matters. (c) On July 1, 2019, Duke Energy Indiana filed its 2018 IRP with the IURC. The 2018 IRP included scenarios evaluating the potential retirement of coal-fired generating units at Gibson and Cayuga. The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. These updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Reserves	The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts Payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) June 30, 2020 December 31, 2019 Reserves for Environmental Remediation Duke Energy $ 55 $ 58 Duke Energy Carolinas 10 11 Progress Energy 14 16 Duke Energy Progress 5 4 Duke Energy Florida 8 9 Duke Energy Ohio 19 19 Duke Energy Indiana 5 4 Piedmont 7 8 The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves discussed above. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above. (in millions) June 30, 2020 December 31, 2019 Reserves for Legal Matters Duke Energy $ 60 $ 62 Duke Energy Carolinas 3 2 Progress Energy 52 55 Duke Energy Progress 9 12 Duke Energy Florida 23 22 Piedmont 1 1
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves	Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below. (in millions) Duke Energy $ 59 Duke Energy Carolinas 11 Duke Energy Ohio 42

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table summarizes significant debt issuances (in millions). Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Florida Ohio Indiana Piedmont Unsecured Debt May 2020 (a) Jun 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — May 2020 (b) Jun 2050 3.350 % 400 — — — — — 400 First Mortgage Bonds January 2020 (c) Feb 2030 2.450 % 500 — 500 — — — — January 2020 (c) Aug 2049 3.200 % 400 — 400 — — — — March 2020 (d) Apr 2050 2.750 % 550 — — — — 550 — May 2020 (b) Jun 2030 2.125 % 400 — — — 400 — — June 2020 (b) Jun 2030 1.750 % 500 — — 500 — — — Total issuances $ 3,250 $ 500 $ 900 $ 500 $ 400 $ 550 $ 400 (a) Debt issued to repay $500 million borrowing made under Duke Energy (Parent) revolving credit facility in March 2020, and for general corporate purposes. (b) Debt issued to repay short-term debt and for general corporate purposes. (c) Debt issued to repay at maturity $450 million first mortgage bonds due June 2020 and for general corporate purposes. (d) Debt issued to repay at maturity $500 million first mortgage bonds due July 2020 and to pay down short-term debt. The following table shows the significant components of Current Maturities of Long-Term Debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings. (in millions) Maturity Date Interest Rate June 30, 2020 Unsecured Debt Duke Energy Progress December 2020 0.986 % (a) $ 700 Progress Energy, Inc January 2021 4.400 % 500 Duke Energy (Parent) May 2021 0.924 % (a) 500 Piedmont June 2021 4.240 % 160 Secured Debt Duke Energy Florida April 2021 1.384 % (a) 250 First Mortgage Bonds Duke Energy Indiana July 2020 3.750 % 500 Duke Energy Progress September 2020 0.498 % (a) 300 Duke Energy Carolinas June 2021 3.900 % 500 Other (b) 346 Current maturities of long-term debt $ 3,756 (a) Debt has a floating interest rate. (b) Includes finance lease obligations, amortizing debt and small bullet maturities.
Schedule Of Line Of Credit Facilities	Other Credit Facilities June 30, 2020 (in millions) Facility size Amount drawn Duke Energy (Parent) Three-Year Revolving Credit Facility (a) $ 1,000 $ 500 Duke Energy Progress Term Loan Facility 700 700 (a) In March 2020, Duke Energy (Parent) drew down the remaining $500 million . In May 2020, Duke Energy (Parent) repaid $500 million with proceeds of May 2020 unsecured debt issuance. The table below includes the current borrowing sublimits and available capacity under these credit facilities. June 30, 2020 Duke Duke Duke Duke Duke Duke Duke Energy Energy Energy Energy Energy Energy (in millions) Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Facility size (a) $ 8,000 $ 2,650 $ 1,500 $ 1,250 $ 800 $ 600 $ 600 $ 600 Reduction to backstop issuances Commercial paper (b) (2,480 ) (1,248 ) (389 ) (323 ) (156 ) (79 ) (150 ) (135 ) Outstanding letters of credit (47 ) (40 ) (3 ) (2 ) — — — (2 ) Tax-exempt bonds (81 ) — — — — — (81 ) — Available capacity under the Master Credit Facility $ 5,392 $ 1,362 $ 1,108 $ 925 $ 644 $ 521 $ 369 $ 463 (a) Represents the sublimit of each borrower. (b) Duke Energy issued $625 million

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill By Reportable Operating Segment	The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at June 30, 2020 , and December 31, 2019 . Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill balance $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122 ) (122 ) Goodwill, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, Other Revenue and Expense	The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants. Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Carolinas Energy Progress Florida Ohio Indiana Piedmont June 30, 2020 Intercompany income tax receivable $ — $ 63 $ — $ — $ — $ 10 $ 23 Intercompany income tax payable 19 — 7 51 1 — — December 31, 2019 Intercompany income tax receivable $ — $ 125 $ 28 $ — $ 9 $ 28 $ 13 Intercompany income tax payable 5 — — 2 — — — Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 196 $ 197 $ 330 $ 409 Indemnification coverages (b) 5 5 10 10 Joint Dispatch Agreement (JDA) revenue (c) 3 17 10 40 JDA expense (c) 20 20 44 113 Intercompany natural gas purchases (d) 10 3 16 7 Progress Energy Corporate governance and shared service expenses (a) $ 189 $ 183 $ 335 $ 359 Indemnification coverages (b) 9 10 18 19 JDA revenue (c) 20 20 44 113 JDA expense (c) 3 17 10 40 Intercompany natural gas purchases (d) 19 19 38 38 Duke Energy Progress Corporate governance and shared service expenses (a) $ 113 $ 108 $ 188 $ 214 Indemnification coverages (b) 5 4 9 8 JDA revenue (c) 20 20 44 113 JDA expense (c) 3 17 10 40 Intercompany natural gas purchases (d) 19 19 38 38 Duke Energy Florida Corporate governance and shared service expenses (a) $ 76 $ 75 $ 147 $ 145 Indemnification coverages (b) 4 6 9 11 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 77 $ 83 $ 161 $ 168 Indemnification coverages (b) 1 1 2 2 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 92 $ 93 $ 198 $ 190 Indemnification coverages (b) 2 1 4 3 Piedmont Corporate governance and shared service expenses (a) $ 37 $ 37 $ 71 $ 69 Indemnification coverages (b) — — 1 1 Intercompany natural gas sales (d) 29 22 54 45 Natural gas storage and transportation costs (e) 6 6 12 11 (a) The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income. (b) The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income. (c) Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income. (d) Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income. (e)

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Outstanding Derivative Positions	The following table shows notional amounts of outstanding derivatives related to interest rate risk. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 650 $ — $ — $ — $ — $ — Undesignated contracts 1,477 400 1,050 1,050 — 27 Total notional amount (a) $ 2,127 $ 400 $ 1,050 $ 1,050 $ — $ 27 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 993 $ — $ — $ — $ — $ — Undesignated contracts 1,277 450 800 250 550 27 Total notional amount (a) $ 2,270 $ 450 $ 800 $ 250 $ 550 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $650 million in cash flow hedges as of June 30, 2020 , and $693 million in cash flow hedges as of December 31, 2019 . The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 28,179 — — — 4,405 23,774 — Natural gas (millions of dekatherms) 707 147 165 165 — 4 391 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 15,858 — — — 1,887 13,971 — Natural gas (millions of dekatherms) 704 130 160 160 — 3 411
Location And Fair Value Of Derivatives Recognized in the Condensed Consolidated Balance Sheets	The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Condensed Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown. Derivative Assets June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 20 $ 2 $ 1 $ 1 $ — $ 3 $ 10 $ 4 Noncurrent 7 5 2 2 — — — — Total Derivative Assets – Commodity Contracts $ 27 $ 7 $ 3 $ 3 $ — $ 3 $ 10 $ 4 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Noncurrent 2 — 2 2 — — — — Total Derivative Assets – Interest Rate Contracts $ 5 $ — $ 5 $ 5 $ — $ — $ — $ — Total Derivative Assets $ 32 $ 7 $ 8 $ 8 $ — $ 3 $ 10 $ 4 Derivative Liabilities June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 55 $ 29 $ 17 $ 17 $ — $ — $ 1 $ 7 Noncurrent 138 8 32 16 — — — 98 Total Derivative Liabilities – Commodity Contracts $ 193 $ 37 $ 49 $ 33 $ — $ — $ 1 $ 105 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 56 — — — — — — — Not Designated as Hedging Instruments Current 68 20 48 48 — 1 — — Noncurrent 30 — 24 24 — 6 — — Total Derivative Liabilities – Interest Rate Contracts $ 168 $ 20 $ 72 $ 72 $ — $ 7 $ — $ — Total Derivative Liabilities $ 361 $ 57 $ 121 $ 105 $ — $ 7 $ 1 $ 105 Derivative Assets December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ 3 $ 13 $ 1 Noncurrent 1 — — — — 1 — — Total Derivative Assets – Commodity Contracts $ 18 $ — $ — $ — $ — $ 4 $ 13 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current 6 — 6 — 6 — — — Total Derivative Assets – Interest Rate Contracts $ 6 $ — $ 6 $ — $ 6 $ — $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 1 — 1 — 1 — — — Total Derivative Assets – Equity Securities Contracts $ 1 $ — $ 1 $ — $ 1 $ — $ — $ — Total Derivative Assets $ 25 $ — $ 7 $ — $ 7 $ 4 $ 13 $ 1 Derivative Liabilities December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 67 $ 33 $ 26 $ 26 $ — $ — $ 1 $ 7 Noncurrent 156 10 37 22 — — — 110 Total Derivative Liabilities – Commodity Contracts $ 223 $ 43 $ 63 $ 48 $ — $ — $ 1 $ 117 Interest Rate Contracts Designated as Hedging Instruments Current $ 19 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 8 6 1 1 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 53 $ 6 $ 1 $ 1 $ — $ 6 $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 24 — 24 — 24 — — — Total Derivative Liabilities – Equity Securities Contracts $ 24 $ — $ 24 $ — $ 24 $ — $ — $ — Total Derivative Liabilities $ 300 $ 49 $ 88 $ 49 $ 24 $ 6 $ 1 $ 117
Offsetting Assets	The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below. Derivative Assets June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 23 $ 2 $ 4 $ 4 $ — $ 3 $ 10 $ 4 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Assets: Other $ 20 $ — $ 3 $ 3 $ — $ 3 $ 10 $ 4 Noncurrent Gross amounts recognized $ 9 $ 5 $ 4 $ 4 $ — $ — $ — $ — Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 5 $ 3 $ 2 $ 2 $ — $ — $ — $ — Derivative Liabilities June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 137 $ 49 $ 65 $ 65 $ — $ 1 $ 1 $ 7 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Liabilities: Other $ 134 $ 47 $ 64 $ 64 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 224 $ 8 $ 56 $ 40 $ — $ 6 $ — $ 98 Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 220 $ 6 $ 54 $ 38 $ — $ 6 $ — $ 98 Derivative Assets December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110
Offsetting Liabilities	The following tables present the line items on the Condensed Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position, and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below. Derivative Assets June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 23 $ 2 $ 4 $ 4 $ — $ 3 $ 10 $ 4 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Assets: Other $ 20 $ — $ 3 $ 3 $ — $ 3 $ 10 $ 4 Noncurrent Gross amounts recognized $ 9 $ 5 $ 4 $ 4 $ — $ — $ — $ — Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 5 $ 3 $ 2 $ 2 $ — $ — $ — $ — Derivative Liabilities June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 137 $ 49 $ 65 $ 65 $ — $ 1 $ 1 $ 7 Gross amounts offset (3 ) (2 ) (1 ) (1 ) — — — — Net amounts presented in Current Liabilities: Other $ 134 $ 47 $ 64 $ 64 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 224 $ 8 $ 56 $ 40 $ — $ 6 $ — $ 98 Gross amounts offset (4 ) (2 ) (2 ) (2 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 220 $ 6 $ 54 $ 38 $ — $ 6 $ — $ 98 Derivative Assets December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110
Derivative Contracts with Contingent Credit Features	The following tables show information with respect to derivative contracts that are in a net liability position and contain objective credit-risk-related payment provisions. June 30, 2020 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 63 $ 29 $ 34 $ 34 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 63 29 34 34 December 31, 2019 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 79 $ 35 $ 44 $ 44 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 79 35 44 44

Investments in Debt and Equit_2

Investments in Debt and Equity Securities (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 731 $ — $ — $ 101 Equity securities 3,034 92 5,039 3,523 55 5,661 Corporate debt securities 66 2 806 37 1 603 Municipal bonds 18 1 417 13 — 368 U.S. government bonds 62 — 813 33 1 1,256 Other debt securities 9 1 194 3 — 141 Total NDTF Investments $ 3,189 $ 96 $ 8,000 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 113 $ — $ — $ 52 Equity securities 51 — 116 57 — 122 Corporate debt securities 8 — 125 3 — 67 Municipal bonds 5 1 103 4 — 94 U.S. government bonds 3 — 40 2 — 41 Other debt securities 1 1 34 — — 56 Total Other Investments $ 68 $ 2 $ 531 $ 66 $ — $ 432 Total Investments $ 3,257 $ 98 $ 8,531 $ 3,675 $ 57 $ 8,562
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 731 $ — $ — $ 101 Equity securities 3,034 92 5,039 3,523 55 5,661 Corporate debt securities 66 2 806 37 1 603 Municipal bonds 18 1 417 13 — 368 U.S. government bonds 62 — 813 33 1 1,256 Other debt securities 9 1 194 3 — 141 Total NDTF Investments $ 3,189 $ 96 $ 8,000 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 113 $ — $ — $ 52 Equity securities 51 — 116 57 — 122 Corporate debt securities 8 — 125 3 — 67 Municipal bonds 5 1 103 4 — 94 U.S. government bonds 3 — 40 2 — 41 Other debt securities 1 1 34 — — 56 Total Other Investments $ 68 $ 2 $ 531 $ 66 $ — $ 432 Total Investments $ 3,257 $ 98 $ 8,531 $ 3,675 $ 57 $ 8,562
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 302 $ 66 $ 325 $ 101 Realized losses 67 63 132 93 AFS: Realized gains 27 47 47 57 Realized losses 13 36 19 47
Investments Classified by Contractual Maturity Date	The table below summarizes the maturity date for debt securities. June 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 63 $ 19 $ 30 $ 28 $ 2 $ 3 Due after one through five years 563 254 244 235 9 15 Due after five through 10 years 587 270 226 219 7 9 Due after 10 years 1,319 696 543 509 34 18 Total $ 2,532 $ 1,239 $ 1,043 $ 991 $ 52 $ 45
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 30 $ — $ — $ 21 Equity securities 1,796 47 2,989 1,914 8 3,154 Corporate debt securities 41 2 519 21 1 361 Municipal bonds 6 — 133 3 — 96 U.S. government bonds 30 — 399 16 1 578 Other debt securities 7 1 188 3 — 137 Total NDTF Investments $ 1,880 $ 50 $ 4,258 $ 1,957 $ 10 $ 4,347
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 30 $ — $ — $ 21 Equity securities 1,796 47 2,989 1,914 8 3,154 Corporate debt securities 41 2 519 21 1 361 Municipal bonds 6 — 133 3 — 96 U.S. government bonds 30 — 399 16 1 578 Other debt securities 7 1 188 3 — 137 Total NDTF Investments $ 1,880 $ 50 $ 4,258 $ 1,957 $ 10 $ 4,347
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 27 $ 44 $ 36 $ 67 Realized losses 25 48 70 69 AFS: Realized gains 18 16 30 25 Realized losses 8 11 13 21
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 701 $ — $ — $ 80 Equity securities 1,238 45 2,050 1,609 47 2,507 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,309 $ 46 $ 3,742 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 108 $ — $ — $ 49 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,313 $ 46 $ 3,902 $ 1,655 $ 47 $ 3,883
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 701 $ — $ — $ 80 Equity securities 1,238 45 2,050 1,609 47 2,507 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,309 $ 46 $ 3,742 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 108 $ — $ — $ 49 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,313 $ 46 $ 3,902 $ 1,655 $ 47 $ 3,883
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 275 $ 22 $ 289 $ 34 Realized losses 42 15 62 24 AFS: Realized gains 6 30 11 31 Realized losses 4 25 5 26
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 63 $ — $ — $ 53 Equity securities 1,176 45 1,977 1,258 21 2,077 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,247 $ 46 $ 3,031 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,247 $ 46 $ 3,032 $ 1,300 $ 21 $ 3,053
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 63 $ — $ — $ 53 Equity securities 1,176 45 1,977 1,258 21 2,077 Corporate debt securities 25 — 287 16 — 242 Municipal bonds 12 1 284 10 — 272 U.S. government bonds 32 — 414 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,247 $ 46 $ 3,031 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,247 $ 46 $ 3,032 $ 1,300 $ 21 $ 3,053
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 26 $ 7 $ 40 $ 17 Realized losses 27 7 47 15 AFS: Realized gains 6 1 11 2 Realized losses 4 1 5 2
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 638 $ — $ — $ 27 Equity securities 62 — 73 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 62 $ — $ 711 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 54 $ 3 $ — $ 55 Total Investments $ 66 $ — $ 765 $ 355 $ 26 $ 787 (a) During the six months ended June 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 638 $ — $ — $ 27 Equity securities 62 — 73 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 62 $ — $ 711 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 52 3 — 51 Total Other Investments $ 4 $ — $ 54 $ 3 $ — $ 55 Total Investments $ 66 $ — $ 765 $ 355 $ 26 $ 787 (a) During the six months ended June 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2020 , and 2019 , were as follows. Three Months Ended Six Months Ended (in millions) June 30, 2020 June 30, 2019 June 30, 2020 June 30, 2019 FV-NI: Realized gains $ 249 $ 15 $ 249 $ 17 Realized losses 15 8 15 9 AFS: Realized gains — 29 — 29 Realized losses — 24 — 24
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Equity securities $ 39 $ — $ 77 $ 43 $ — $ 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 40 $ 1 $ 122 $ 44 $ — $ 125
Debt Securities, Available-for-sale	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS. June 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Equity securities $ 39 $ — $ 77 $ 43 $ — $ 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 40 $ 1 $ 122 $ 44 $ — $ 125

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 8 . See Note 9 for additional information related to investments by major security type for the Duke Energy Registrants. June 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 731 $ 731 $ — $ — $ — NDTF equity securities 5,039 4,991 — — 48 NDTF debt securities 2,230 336 1,894 — — Other equity securities 116 116 — — — Other debt securities 302 36 266 — — Other cash and cash equivalents 113 113 — — — Derivative assets 32 4 15 13 — Total assets 8,563 6,327 2,175 13 48 Derivative liabilities (361 ) (1 ) (255 ) (105 ) — Net assets (liabilities) $ 8,202 $ 6,326 $ 1,920 $ (92 ) $ 48 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 101 $ 101 $ — $ — $ — NDTF equity securities 5,684 5,633 — — 51 NDTF debt securities 2,368 725 1,643 — — Other equity securities 122 122 — — — Other debt securities 258 39 219 — — Other cash and cash equivalents 52 52 — — — Derivative assets 25 3 7 15 — Total assets 8,610 6,675 1,869 15 51 NDTF equity security contracts (23 ) — (23 ) — — Derivative liabilities (277 ) (15 ) (145 ) (117 ) — Net assets (liabilities) $ 8,310 $ 6,660 $ 1,701 $ (102 ) $ 51
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (88 ) $ (115 ) $ (102 ) $ (113 ) Purchases, sales, issuances and settlements: Purchases 14 38 14 38 Settlements (6 ) (11 ) (15 ) (23 ) Total (losses) gains included on the Condensed Consolidated Balance Sheet (12 ) 9 11 19 Balance at end of period $ (92 ) $ (79 ) $ (92 ) $ (79 )
Quantitative Information Table - Level 3	The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. June 30, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 3 RTO auction pricing FTR price – per MWh $ 0.23 - $ 1.45 $ 0.69 Duke Energy Indiana FTRs 10 RTO auction pricing FTR price – per MWh (1.03 ) - 6.19 0.71 Piedmont Natural gas contracts (105 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.73 - 2.39 2.01 Duke Energy Total Level 3 derivatives $ (92 ) December 31, 2019 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 4 RTO auction pricing FTR price – per MWh $ 0.59 - $ 3.47 $ 2.07 Duke Energy Indiana FTRs 11 RTO auction pricing FTR price – per MWh (0.66 ) - 9.24 1.15 Piedmont Natural gas contracts (117 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.59 - 2.46 1.91 Duke Energy Total Level 3 derivatives $ (102 )
Schedule Of Long Term Debt Fair Value	The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements. June 30, 2020 December 31, 2019 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 59,899 $ 68,428 $ 58,126 $ 63,062 Duke Energy Carolinas 12,521 15,046 11,900 13,516 Progress Energy 19,604 23,476 19,634 22,291 Duke Energy Progress 9,063 10,506 9,058 9,934 Duke Energy Florida 7,951 9,655 7,987 9,131 Duke Energy Ohio 3,019 3,551 2,619 2,964 Duke Energy Indiana 4,603 5,617 4,057 4,800 Piedmont 2,779 3,289 2,384 2,642 (a) Book value of long-term debt includes $1.4 billion at June 30, 2020 , and $1.5 billion at December 31, 2019 , of unamortized debt discount and premium, net of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.
Duke Energy Carolinas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 30 $ 30 $ — $ — NDTF equity securities 2,989 2,941 — 48 NDTF debt securities 1,239 125 1,114 — Derivative assets 7 — 7 — Total assets 4,265 3,096 1,121 48 Derivative liabilities (57 ) — (57 ) — Net assets $ 4,208 $ 3,096 $ 1,064 $ 48 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 21 $ 21 $ — $ — NDTF equity securities 3,154 3,103 — 51 NDTF debt securities 1,172 206 966 — Total assets 4,347 3,330 966 51 Derivative liabilities (49 ) — (49 ) — Net assets $ 4,298 $ 3,330 $ 917 $ 51
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 701 $ 701 $ — $ 80 $ 80 $ — NDTF equity securities 2,050 2,050 — 2,530 2,530 — NDTF debt securities 991 211 780 1,196 519 677 Other debt securities 52 — 52 51 — 51 Other cash and cash equivalents 108 108 — 49 49 — Derivative assets 8 — 8 7 — 7 Total assets 3,910 3,070 840 3,913 3,178 735 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities (121 ) — (121 ) (65 ) — (65 ) Net assets $ 3,789 $ 3,070 $ 719 $ 3,825 $ 3,178 $ 647
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NTDF cash and cash equivalents $ 63 $ 63 $ — $ 53 $ 53 $ — NDTF equity securities 1,977 1,977 — 2,077 2,077 — NDTF debt securities 991 211 780 921 244 677 Other cash and cash equivalents 1 1 — 2 2 — Derivative assets 8 — 8 — — — Total assets 3,040 2,252 788 3,053 2,376 677 Derivative liabilities (105 ) — (105 ) (49 ) — (49 ) Net assets $ 2,935 $ 2,252 $ 683 $ 3,004 $ 2,376 $ 628
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 638 $ 638 $ — $ 27 $ 27 $ — NDTF equity securities 73 73 — 453 453 — NDTF debt securities — — — 275 275 — Other debt securities 52 — 52 51 — 51 Other cash and cash equivalents 2 2 — 4 4 — Derivative assets — — — 7 — 7 Total assets 765 713 52 817 759 58 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities — — — (1 ) — (1 ) Net assets $ 765 $ 713 $ 52 $ 793 $ 759 $ 34
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 77 $ 77 $ — $ — $ 81 $ 81 $ — $ — Other debt securities 45 — 45 — 44 — 44 — Derivative assets 10 — — 10 13 2 — 11 Total assets $ 132 $ 77 $ 45 $ 10 $ 138 $ 83 $ 44 $ 11 Derivative liabilities (1 ) (1 ) — — (1 ) (1 ) — — Net assets $ 131 $ 76 $ 45 $ 10 $ 137 $ 82 $ 44 $ 11
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ 2 $ 5 $ 11 $ 22 Purchases, sales, issuances and settlements: Purchases 10 29 10 29 Settlements (4 ) (9 ) (10 ) (19 ) Total gains (losses) included on the Condensed Consolidated Balance Sheet 2 3 (1 ) (4 ) Balance at end of period $ 10 $ 28 $ 10 $ 28
Piedmont Natural Gas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. June 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 3 Total Fair Value Level 1 Level 3 Derivative assets $ 4 $ 4 $ — $ 1 $ 1 $ — Derivative liabilities (105 ) — (105 ) (117 ) — (117 ) Net (liabilities) assets $ (101 ) $ 4 $ (105 ) $ (116 ) $ 1 $ (117 )
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (91 ) $ (121 ) $ (117 ) $ (141 ) Total gains and settlements (14 ) 7 12 27 Balance at end of period $ (105 ) $ (114 ) $ (105 ) $ (114 )

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2020
VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above. Duke Energy Duke Energy Duke Energy Duke Energy Carolinas Progress Florida (in millions) CRC DERF DEPR DEFR Expiration date February 2023 December 2022 April 2023 April 2021 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at June 30, 2020 350 475 333 250 Amounts borrowed at December 31, 2019 350 474 325 250 Restricted Receivables at June 30, 2020 454 675 451 463 Restricted Receivables at December 31, 2019 522 642 489 336
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets. June 30, 2020 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 34 $ 49 Investments in equity method unconsolidated affiliates — 413 1 414 — — Deferred tax asset 439 — — 439 — — Total assets $ 439 $ 412 $ 1 $ 852 $ 34 $ 49 Taxes accrued 9 — — 9 — — Other current liabilities 920 — 4 924 — — Other noncurrent liabilities — — 10 10 — — Total liabilities $ 929 $ — $ 14 $ 943 $ — $ — Net (liabilities) assets $ (490 ) $ 412 $ (13 ) $ (91 ) $ 34 $ 49 December 31, 2019 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 64 $ 77 Investments in equity method unconsolidated affiliates 1,179 300 — 1,479 — — Total assets $ 1,179 $ 299 $ — $ 1,478 $ 64 $ 77 Taxes accrued (1 ) — — (1 ) — — Other current liabilities — — 4 4 — — Deferred income taxes 59 — — 59 — — Other noncurrent liabilities — — 11 11 — — Total liabilities $ 58 $ — $ 15 $ 73 $ — $ — Net assets (liabilities) $ 1,121 $ 299 $ (15 ) $ 1,405 $ 64 $ 77
DEFPF | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets. (in millions) June 30, 2020 December 31, 2019 Receivables of VIEs $ 6 $ 5 Regulatory Assets: Current 53 52 Current Assets: Other 32 39 Other Noncurrent Assets: Regulatory assets 969 989 Current Liabilities: Other 10 10 Current maturities of long-term debt 54 54 Long-Term Debt 1,028 1,057
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs. (in millions) June 30, 2020 December 31, 2019 Current Assets: Other $ 228 $ 203 Property, Plant and Equipment: Cost 6,198 5,747 Accumulated depreciation and amortization (1,145 ) (1,041 ) Other Noncurrent Assets: Other 75 106 Current maturities of long-term debt 158 162 Long-Term Debt 1,457 1,541 Other Noncurrent Liabilities: AROs 144 127 Other Noncurrent Liabilities: Other 251 228
CRC | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana (in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Receivables sold $ 221 $ 253 $ 280 $ 307 Less: Retained interests 34 64 49 77 Net receivables sold $ 187 $ 189 $ 231 $ 230 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, (in millions) 2020 2019 2020 2019 2020 2019 2020 2019 Sales Receivables sold $ 429 $ 429 $ 966 $ 1,004 $ 583 $ 676 $ 1,230 $ 1,410 Loss recognized on sale 2 3 6 7 2 4 6 9 Cash flows Cash proceeds from receivables sold $ 431 $ 448 $ 990 $ 1,045 $ 580 $ 680 $ 1,252 $ 1,438 Return received on retained interests — 2 2 4 1 2 3 5
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	For the three and six months ended June 30, 2020 , the ACP investment is considered a significant subsidiary because its income exceeds 20% of Duke Energy’s income. The table below presents unaudited summarized financial information for ACP. Three Months Ended June 30, Six Months Ended June 30, (in millions) 2020 2019 2020 2019 Net (Loss) Income $ (4,414 ) $ 61 $ (4,342 ) $ 114 The table below presents Duke Energy's ownership interest and investment balances in these joint ventures. VIE Investment Amount (in millions) Ownership June 30, December 31, Entity Name Interest 2020 2019 ACP (a) 47 % $ (920 ) $ 1,179 Constitution (b) 24 % — — Total $ (920 ) $ 1,179 (a) During the quarter ended June 30, 2020, Duke Energy abandoned its investment in ACP as described above. The current liability related to the abandonment of ACP represents Duke Energy's obligation to fund ACP's obligations. See Notes 1, 3 and 4 for more information. (b) During the year ended December 31, 2019, Duke Energy recorded an other-than-temporary impairment related to Constitution. This charge resulted in the full write-down of Duke Energy's investment in Constitution.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	Estimated remaining performance obligations are as follows: Remaining Performance Obligations (in millions) 2020 2021 2022 2023 2024 Thereafter Total Piedmont $ 34 $ 65 $ 64 $ 61 $ 58 $ 376 $ 658 Remaining Performance Obligations (in millions) 2020 2021 2022 2023 2024 Thereafter Total Progress Energy $ 58 $ 92 $ 94 $ 44 $ 45 $ 58 $ 391 Duke Energy Progress 4 8 8 8 8 — 36 Duke Energy Florida 54 84 86 36 37 58 355 Duke Energy Indiana 5 5 — — — — 10
Disaggregation of Revenue	Disaggregated revenues are presented as follows: Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 2,249 $ 677 $ 1,173 $ 460 $ 713 $ 169 $ 231 $ — General 1,379 507 611 298 313 103 161 — Industrial 658 260 212 154 58 33 152 — Wholesale 435 101 285 240 45 5 44 — Other revenues 284 62 191 70 121 19 25 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 5,005 $ 1,607 $ 2,472 $ 1,222 $ 1,250 $ 329 $ 613 $ — Gas Utilities and Infrastructure Residential $ 157 $ — $ — $ — $ — $ 62 $ — $ 96 Commercial 75 — — — — 23 — 52 Industrial 27 — — — — 3 — 22 Power Generation — — — — — — — 6 Other revenues 12 — — — — 3 — 11 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 271 $ — $ — $ — $ — $ 91 $ — $ 187 Commercial Renewables Revenue from contracts with customers $ 55 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 5,338 $ 1,607 $ 2,472 $ 1,222 $ 1,250 $ 420 $ 613 $ 187 Other revenue sources (a) $ 83 $ 3 $ 26 $ 21 $ — $ 3 $ 4 $ 10 Total revenues $ 5,421 $ 1,610 $ 2,498 $ 1,243 $ 1,250 $ 423 $ 617 $ 197 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Three Months Ended June 30, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 2,304 $ 679 $ 1,243 $ 496 $ 747 $ 159 $ 225 $ — General 1,584 531 750 339 411 105 197 — Industrial 759 289 231 164 67 36 201 — Wholesale 527 109 351 309 42 9 59 — Other revenues 187 68 99 44 55 25 27 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 5,361 $ 1,676 $ 2,674 $ 1,352 $ 1,322 $ 334 $ 709 $ — Gas Utilities and Infrastructure Residential $ 146 $ — $ — $ — $ — $ 64 $ — $ 82 Commercial 85 — — — — 26 — 59 Industrial 29 — — — — 3 — 24 Power Generation — — — — — — — 13 Other revenues 22 — — — — 2 — 19 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 282 $ — $ — $ — $ — $ 95 $ — $ 197 Commercial Renewables Revenue from contracts with customers $ 46 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 6 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 5,695 $ 1,676 $ 2,674 $ 1,352 $ 1,322 $ 429 $ 709 $ 197 Other revenue sources (a) $ 178 $ 37 $ 70 $ 35 $ 31 $ 4 $ 5 $ 12 Total revenues $ 5,873 $ 1,713 $ 2,744 $ 1,387 $ 1,353 $ 433 $ 714 $ 209 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 4,515 $ 1,433 $ 2,242 $ 962 $ 1,280 $ 345 $ 496 $ — General 2,887 1,056 1,275 617 658 217 342 — Industrial 1,351 529 428 308 120 68 327 — Wholesale 932 215 606 519 87 12 99 — Other revenues 475 122 309 133 176 39 41 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 10,160 $ 3,355 $ 4,860 $ 2,539 $ 2,321 $ 681 $ 1,305 $ — Gas Utilities and Infrastructure Residential $ 519 $ — $ — $ — $ — $ 159 $ — $ 360 Commercial 244 — — — — 66 — 178 Industrial 68 — — — — 9 — 58 Power Generation — — — — — — — 17 Other revenues 42 — — — — 9 — 35 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 873 $ — $ — $ — $ — $ 243 $ — $ 648 Commercial Renewables Revenue from contracts with customers $ 113 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 13 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 11,159 $ 3,355 $ 4,860 $ 2,539 $ 2,321 $ 924 $ 1,305 $ 648 Other revenue sources (a) $ 211 $ 3 $ 60 $ 42 $ 9 $ (3 ) $ 4 $ 61 Total revenues $ 11,370 $ 3,358 $ 4,920 $ 2,581 $ 2,330 $ 921 $ 1,309 $ 709 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Six Months Ended June 30, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 4,674 $ 1,439 $ 2,357 $ 1,032 $ 1,325 $ 348 $ 531 $ — General 3,011 1,027 1,382 645 737 208 394 — Industrial 1,470 555 453 325 128 69 391 — Wholesale 1,068 228 704 624 80 23 113 — Other revenues 359 146 271 169 102 41 44 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 10,582 $ 3,395 $ 5,167 $ 2,795 $ 2,372 $ 689 $ 1,473 $ — Gas Utilities and Infrastructure Residential $ 560 $ — $ — $ — $ — $ 176 $ — $ 384 Commercial 291 — — — — 75 — 216 Industrial 77 — — — — 10 — 66 Power Generation — — — — — — — 26 Other revenues 85 — — — — 10 — 75 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,013 $ — $ — $ — $ — $ 271 $ — $ 767 Commercial Renewables Revenue from contracts with customers $ 88 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 10 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 11,693 $ 3,395 $ 5,167 $ 2,795 $ 2,372 $ 960 $ 1,473 $ 767 Other revenue sources (a) $ 343 $ 62 $ 149 $ 76 $ 67 $ 4 $ 9 $ 21 Total revenues $ 12,036 $ 3,457 $ 5,316 $ 2,871 $ 2,439 $ 964 $ 1,482 $ 788 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.
Reserve for Credit Losses for Trade and Other Receivables	As described in Note 1 , Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard. Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at March 31, 2020 $ 89 $ 11 $ 20 $ 9 $ 11 $ 5 $ 3 $ 9 Write-Offs (9 ) (3 ) (3 ) (3 ) — — — (4 ) Credit Loss Expense 15 6 12 8 3 — — 1 Other Adjustments 7 — — — — — — — Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6 Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 76 $ 10 $ 16 $ 8 $ 7 $ 4 $ 3 $ 6 Cumulative Change in Accounting Principle 5 1 2 1 1 — — 1 Write-Offs (19 ) (6 ) (7 ) (5 ) (2 ) — — (5 ) Credit Loss Expense 33 9 18 10 8 1 — 4 Other Adjustments 7 — — — — — — — Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6
Aging of Trade Receivables	These receivables for unbilled revenues are shown in the table below. (in millions) June 30, 2020 December 31, 2019 Duke Energy Ohio $ 68 $ 82 Duke Energy Indiana 106 115 The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables $ 829 $ 332 $ 274 $ 137 $ 137 $ 1 $ 7 $ 6 0-30 days 1,624 470 685 336 344 48 28 73 30-60 days 152 49 56 28 28 6 1 6 60-90 days 90 29 34 17 17 4 1 5 90+ days 209 64 53 24 29 29 10 18 Trade and Other Receivables $ 2,904 $ 944 $ 1,102 $ 542 $ 555 $ 88 $ 47 $ 108 Unbilled revenues are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets as shown in the following table. (in millions) June 30, 2020 December 31, 2019 Duke Energy $ 829 $ 843 Duke Energy Carolinas 332 298 Progress Energy 274 217 Duke Energy Progress 137 122 Duke Energy Florida 137 95 Duke Energy Ohio 1 1 Duke Energy Indiana 7 16 Piedmont 6 78

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Schedule Of Earnings Per Share	The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared. Three Months Ended June 30, Six Months Ended June 30, (in millions, except per share amounts) 2020 2019 2020 2019 Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities $ (817 ) $ 819 $ 82 $ 1,718 Accumulated preferred stock dividends (12 ) — — — Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities and including accumulated preferred stock dividends $ (829 ) $ 819 $ 82 $ 1,718 Weighted average common shares outstanding – basic 735 728 734 728 Equity forwards — — 1 — Weighted average common shares outstanding – diluted 735 728 735 728 Earnings (Loss) Per Share available to Duke Energy common stockholders Basic and diluted $ (1.13 ) $ 1.12 $ 0.11 $ 2.36 Potentially dilutive items excluded from the calculation (a) 2 2 2 2 Dividends declared per common share $ 0.945 $ 0.928 $ 1.890 $ 1.855 Dividends declared on Series A preferred stock per depositary share (b) $ 0.359 $ 0.307 $ 0.719 $ 0.307 Dividends declared on Series B preferred stock per share (c) $ — $ — $ 24.917 $ — (a) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met. (b) 5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share. (c) 4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Pension Costs	The following tables include the components of net periodic pension costs for qualified pension plans. Three Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 42 $ 14 $ 12 $ 8 $ 6 $ 1 $ 2 $ 2 Interest cost on projected benefit obligation 68 15 22 9 11 4 5 3 Expected return on plan assets (143 ) (36 ) (47 ) (22 ) (26 ) (7 ) (10 ) (6 ) Amortization of actuarial loss 30 7 9 4 5 1 3 3 Amortization of prior service credit (8 ) (2 ) (1 ) (1 ) (1 ) — (1 ) (3 ) Amortization of settlement charges 3 1 — 1 — — — — Net periodic pension costs $ (8 ) $ (1 ) $ (5 ) $ (1 ) $ (5 ) $ (1 ) $ (1 ) $ (1 ) Three Months Ended June 30, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 37 $ 12 $ 10 $ 6 $ 6 $ 1 $ 2 $ 2 Interest cost on projected benefit obligation 82 21 26 12 13 4 7 3 Expected return on plan assets (143 ) (37 ) (45 ) (21 ) (22 ) (6 ) (10 ) (6 ) Amortization of actuarial loss 25 5 9 3 6 — 1 1 Amortization of prior service credit (8 ) (2 ) — (1 ) (1 ) — (1 ) (2 ) Net periodic pension costs $ (7 ) $ (1 ) $ — $ (1 ) $ 2 $ (1 ) $ (1 ) $ (2 )	Six Months Ended June 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 83 $ 26 $ 24 $ 14 $ 11 $ 2 $ 4 $ 3 Interest cost on projected benefit obligation 135 31 43 19 23 8 11 5 Expected return on plan assets (286 ) (72 ) (95 ) (44 ) (51 ) (14 ) (21 ) (11 ) Amortization of actuarial loss 64 14 20 9 11 3 6 5 Amortization of prior service credit (16 ) (4 ) (2 ) (1 ) (1 ) — (1 ) (5 ) Amortization of settlement charges 5 2 1 1 — — — — Net periodic pension costs $ (15 ) $ (3 ) $ (9 ) $ (2 ) $ (7 ) $ (1 ) $ (1 ) $ (3 ) Six Months Ended June 30, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 74 $ 24 $ 21 $ 12 $ 10 $ 2 $ 4 $ 3 Interest cost on projected benefit obligation 165 41 52 24 27 9 13 6 Expected return on plan assets (286 ) (75 ) (89 ) (44 ) (44 ) (14 ) (21 ) (11 ) Amortization of actuarial loss 49 11 18 6 12 1 3 3 Amortization of prior service credit (16 ) (4 ) (1 ) (1 ) (1 ) — (1 ) (5 ) Net periodic pension costs $ (14 ) $ (3 ) $ 1 $ (3 ) $ 4 $ (2 ) $ (2 ) $ (4 )

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Summary of Effective Tax Rates	The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table. Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Duke Energy 26.2 % 15.9 % 98.9 % 12.6 % Duke Energy Carolinas 13.7 % 19.7 % 15.1 % 18.7 % Progress Energy 14.9 % 16.7 % 16.1 % 17.0 % Duke Energy Progress 13.9 % 16.3 % 15.7 % 17.1 % Duke Energy Florida 19.1 % 19.6 % 19.4 % 19.5 % Duke Energy Ohio 15.4 % 16.1 % 16.6 % 16.5 % Duke Energy Indiana 17.3 % 24.2 % 19.3 % 24.2 % Piedmont 128.6 % 22.2 % 5.8 % 21.8 %

Organization and Basis of Pre_4

Organization and Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses	$ 1,353	$ 1,434	$ 2,692	$ 2,853
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201613Member
Current Liabilities: Other	2,898		2,898		$ 2,367
ACP
Noncontrolling Interest [Line Items]
Current Liabilities: Other	920		920
Piedmont Natural Gas
Noncontrolling Interest [Line Items]
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses	79	$ 83	159	$ 163
Current Liabilities: Other	56		56		67
Piedmont Natural Gas | Other
Noncontrolling Interest [Line Items]
Income taxes receivable	22		22		14
Prepaid assets	19		19		$ 3
Incremental COVID-19 costs
Noncontrolling Interest [Line Items]
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses	34		$ 40
Waived Late Payment Fees	$ 25

Organization and Basis of Pre_5

Organization and Basis of Presentation (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash received for the sale of noncontrolling interest to tax equity members	$ 60	$ 187	$ 163	$ 193
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$ 79	$ 83	$ 128	$ 90

Organization and Basis of Pre_6

Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 341	$ 311
Other	193	222
Other Noncurrent Assets
Other	107	40
Total cash, cash equivalents and restricted cash	641	573	$ 481	$ 591
Progress Energy
Current Assets
Cash and cash equivalents	78	48
Other	31	39
Other Noncurrent Assets
Other	102	39
Total cash, cash equivalents and restricted cash	211	126	120	112
Duke Energy Florida
Current Assets
Cash and cash equivalents	20	17
Other	31	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 51	$ 56	$ 47	$ 75

Organization and Basis of Pre_7

Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Public Utilities, Inventory [Line Items]
Inventory	$ 3,289	$ 3,232
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,220	2,297
Coal
Public Utilities, Inventory [Line Items]
Inventory	776	586
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	293	349
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	1,080	996
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	769	768
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	271	187
Duke Energy Carolinas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	40	41
Progress Energy
Public Utilities, Inventory [Line Items]
Inventory	1,466	1,423
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,014	1,038
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	257	186
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	195	199
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	980	934
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	682	686
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	189	138
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	109	110
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	486	489
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	333	351
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	68	48
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	85	90
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	129	135
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	83	79
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	13	15
Duke Energy Ohio | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	33	41
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Inventory	489	517
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	254	318
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	234	198
Duke Energy Indiana | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	1	1
Piedmont Natural Gas
Public Utilities, Inventory [Line Items]
Inventory	29	72
Piedmont Natural Gas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	5	5
Piedmont Natural Gas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 24	$ 67

Organization and Basis of Pre_8

Organization and Basis of Presentation (Schedule of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 47,951	$ 46,611	$ 48,083	$ 45,332	$ 45,045	$ 43,834
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 15,593	16,221	15,877	14,839	14,508	14,257
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	4,108	2,707	4,221	3,502	3,360	3,113
Retained Earnings | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	6,465	$ 7,090	$ 6,747	$ 5,715	$ 5,386	$ 5,131
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	120
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Carolinas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	16
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	2
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Progress
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Florida
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Piedmont Natural Gas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 1

Business Segments (Narrative) (

Business Segments (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)segment
Duke Energy Ohio
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Wind and solar | Nonregulated
Segment Reporting Information [Line Items]
Renewable merchant plants | $	$ 155
Joint owner ownership percentage	51.00%

Business Segments (Business Seg

Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 5,421	$ 5,873	$ 11,370	$ 12,036
Segment income (loss)	(817)	820	82	1,720
Add: Noncontrolling interests	(90)	(84)	(138)	(91)
Add: Preferred stock dividend	15	12	54	12
Net (Loss) Income	(892)	748	(2)	1,641
Segment assets	160,049		160,049		$ 158,838
Net (Loss) Income	(1,968)	44	(1,924)	87
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,026	5,467	10,200	10,788
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	265	282	905	1,014
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	123	118	252	224
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,414	5,867	11,357	12,026
Other
Segment Reporting Information [Line Items]
Operating revenues	7	6	13	10
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,034	5,475	10,217	10,804
Segment income (loss)	753	809	1,458	1,559
Segment assets	136,724		136,724
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	289	306	953	1,062
Segment income (loss)	(1,576)	40	(1,327)	266
Segment assets	13,072		13,072
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	123	118	252	224
Segment income (loss)	90	86	147	99
Segment assets	6,386		6,386
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,446	5,899	11,422	12,090
Segment income (loss)	(733)	935	278	1,924
Segment assets	156,182		156,182
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	26	25	49	46
Segment income (loss)	(84)	(115)	(196)	(204)
Segment assets	3,874		3,874
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(51)	(51)	(101)	(100)
Segment assets	(7)		(7)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	8	8	17	16
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	24	24	48	48
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	32	32	65	64
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	19	19	36	36
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	1,610	1,713	3,358	3,457
Segment assets	44,579		44,579		44,053
Duke Energy Carolinas | Other
Segment Reporting Information [Line Items]
Segment income (loss)			98
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	423	433	921	964
Segment income (loss)	66	47	131	116
Segment assets	9,609		9,609		$ 9,338
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	330	336	676	691
Segment income (loss)	44	31	74	67
Segment assets	6,378		6,378
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	93	97	245	273
Segment income (loss)	23	17	59	52
Segment assets	3,213		3,213
Duke Energy Ohio | Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	423	433	921	964
Segment income (loss)	67	48	133	119
Segment assets	9,591		9,591
Duke Energy Ohio | Other | Other
Segment Reporting Information [Line Items]
Segment income (loss)	(1)	$ (1)	(2)	$ (3)
Segment assets	26		26
Duke Energy Ohio | Eliminations
Segment Reporting Information [Line Items]
Segment assets	(8)		(8)
ACP | ACP
Segment Reporting Information [Line Items]
Net (Loss) Income	$ (2,000)		$ 2,000

Regulatory Matters (Regulatory

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - Duke Energy Carolinas - USD ($) $ in Millions	Jul. 31, 2020	Sep. 30, 2019	May 21, 2019	Nov. 08, 2018	Feb. 28, 2018	Aug. 25, 2017
NCUC | 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 647
Requested return on equity, percent					9.90%
Public utilities, requested equity capital structure, percentage					52.00%
Public utilities, requested debt capital structure, percentage					48.00%
NCUC | 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 291
Requested rate increase, percentage		6.00%
Requested rate increase (decrease), gross amount		$ 445
Requested rate increase (decrease), rider reduction		$ 154
NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period				5 years
NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested return on equity, percent	9.60%
Public utilities, requested equity capital structure, percentage	52.00%
Public utilities, requested debt capital structure, percentage	48.00%
Requested rate increase (decrease), amended amount	$ 800
NCUC | Annual revenue requirement | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount	45
NCUC | Request withdraw | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount	$ 500
PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 168
Approved return on equity percentage			9.50%
Public utilities, approved equity capital structure, percentage			53.00%
Public utilities, approved debt capital structure, percentage			47.00%
Change in tax rate, deferred tax liability, income tax benefit			$ 66
Measurement period adjustment, income tax expense (benefit)			$ 45
PSCSC | South Carolina Rate Case 2018 | State and local jurisdiction | North Carolina Department of Revenue
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period			5 years
State and local taxes reduction amount			$ 17
Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets			$ 96
Regulatory asset, amortization period			5 years
Recovery costs denied			$ 115
Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period			20 years
Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period			5 years
Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period			5 years
Deferred project costs | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets			$ 125
Regulatory asset, amortization period			12 years

Regulatory Matters (Regulator_2

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - Duke Energy Progress $ in Millions

Jul. 31, 2020USD ($)

Jun. 17, 2020USD ($)

Jan. 29, 2020USD ($)MW

Oct. 30, 2019USD ($)

Oct. 11, 2019

May 21, 2019USD ($)

Nov. 08, 2018USD ($)

Nov. 22, 2017

Jun. 01, 2017USD ($)

Jul. 01, 2020USD ($)

Jun. 30, 2020USD ($)

Feb. 07, 2020USD ($)

Dec. 31, 2019USD ($)

Sep. 30, 2019USD ($)

2017 North Carolina Rate Case | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 477

Requested rate increase (decrease), amended amount

$ 420

Requested return on equity, percent

9.90%

Public utilities, requested equity capital structure, percentage

52.00%

Public utilities, requested debt capital structure, percentage

48.00%

2019 North Carolina Rate Case | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 464

Requested rate increase, percentage

12.30%

Requested rate increase (decrease), gross amount

$ 586

Rider reduction

122

Requested rate increase (decrease), rider reduction

$ 120

2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement | Subsequent event | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 500

Requested return on equity, percent

9.60%

Public utilities, requested equity capital structure, percentage

52.00%

Public utilities, requested debt capital structure, percentage

48.00%

Regulatory asset, amortization period

5 years

Annual revenue requirement | Subsequent event | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 25

Request withdraw | Subsequent event | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 500

Hurricane Dorian storm damage

Public Utilities, General Disclosures [Line Items]

Estimated storm costs - O&M

$ 165

Estimated storm costs - capital investments

$ 4

Hurricane Dorian storm damage | PSCSC

Public Utilities, General Disclosures [Line Items]

Storm deferral - O&M

$ 22

Hurricane Dorian storm damage | Subsequent event | PSCSC

Public Utilities, General Disclosures [Line Items]

Requested supplemental true-up

$ 17

Hurricane Dorian storm damage | Storm costs

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 139

$ 179

South Carolina Rate Case 2018 | PSCSC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 59

Approved return on equity percentage

9.50%

Public utilities, approved equity capital structure, percentage

53.00%

Public utilities, approved debt capital structure, percentage

47.00%

Change in tax rate, deferred tax liability, income tax benefit

$ 17

Measurement period adjustment, income tax expense (benefit)

12

South Carolina Rate Case 2018 | State and local jurisdiction | North Carolina Department of Revenue | PSCSC

Public Utilities, General Disclosures [Line Items]

State and local taxes increase amount

12

South Carolina Rate Case 2018 | Asset retirement obligations - coal ash | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory assets

4

Recovery costs denied

$ 65

Regulatory asset, amortization period

5 years

South Carolina Rate Case 2018 | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

20 years

South Carolina Rate Case 2018 | Asset retirement obligations - unprotected EDIT | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

5 years

South Carolina Rate Case 2018 | Asset retirement obligations - deferred revenue | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

3 years

Western Carolinas Modernization Plan | Asheville Plant

Public Utilities, General Disclosures [Line Items]

Capacity (in MW) | MW

376

Generation facilities retired, net

$ 214

Western Carolinas Modernization Plan | Depreciation expense, property taxes, incremental O&M and carrying costs | PSCSC

Public Utilities, General Disclosures [Line Items]

Approved annual rate increase (decrease), amount

$ 8

FERC Return on Equity Complaint | FERC

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage

11.00%

Regulatory Matters (Regulator_3

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida $ in Millions	Jul. 01, 2020USD ($)plantMW	Jun. 30, 2020USD ($)	May 19, 2020USD ($)	Apr. 02, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 19, 2019USD ($)	Nov. 22, 2019USD ($)	Apr. 30, 2019USD ($)
FPSC
Public Utilities, General Disclosures [Line Items]
Accelerated fuel cost refund				$ 78
Hurricane Michael storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance		$ 163			$ 204
Hurricane Michael storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance								$ 223
Amount of recovery costs sought			$ 188				$ 191
Requested supplemental true-up			$ 3
Hurricane Dorian storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance		$ 95			$ 167
Hurricane Dorian storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance						$ 169
Subsequent event | FPSC
Public Utilities, General Disclosures [Line Items]
Number of solar plants | plant	10
Generation capacity (MW) | MW	750
Subsequent event | Solar Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of facilities	$ 1,000
Estimated cost of facilities period	4 years

Regulatory Matters (Regulator_4

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions

Aug. 06, 2020USD ($)

Apr. 27, 2020USD ($)

Jan. 31, 2020USD ($)

Sep. 03, 2019USD ($)

Apr. 13, 2018USD ($)

Mar. 31, 2017USD ($)

Dec. 31, 2015USD ($)

Jun. 30, 2020USD ($)

Jun. 30, 2019USD ($)

Jun. 30, 2020USD ($)site

Jun. 30, 2019USD ($)

Jul. 23, 2020USD ($)

Jul. 12, 2019USD ($)

Dec. 31, 2018USD ($)

Sep. 28, 2018USD ($)

Public Utilities, General Disclosures [Line Items]

Regulated operating revenue, electric, non-nuclear

$ 4,963

$ 5,423

$ 10,087

$ 10,708

Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulated operating revenue, electric, non-nuclear

330

$ 336

676

$ 691

Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 15

Requested return on equity, percent

10.40%

Requested rate decrease, amended amount

$ 19

Requested rate increase (decrease) amended, percentage

9.84%

Public utilities, requested equity capital structure, percentage

50.75%

Public utilities, requested debt capital structure, percentage

49.25%

Approved rate increase (decrease), amount

$ (20)

Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO | Maximum

Public Utilities, General Disclosures [Line Items]

Requested rider revenue increase

$ 10

Duke Energy Ohio | Energy Efficiency Cost Recovery | PUCO

Public Utilities, General Disclosures [Line Items]

Regulated operating revenue, electric, non-nuclear

$ 20

Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Minimum

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

163

163

Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Maximum

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

245

$ 245

Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | PUCO

Public Utilities, General Disclosures [Line Items]

Number of environmental remediation sites | site

2

Regulatory assets

55

$ 55

Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 26

Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO | MGP Costs - regulatory disallowance

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 12

Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 39

$ 39

$ 20

Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO | Subsequent event

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 4

Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO | MGP Costs - regulatory disallowance

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 11

Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 46

Requested rate decrease, amended amount

$ (44)

Approved rate increase (decrease), amount

$ 24

Approved return on equity percentage

9.25%

Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC | Subsequent event

Public Utilities, General Disclosures [Line Items]

Requested rate decrease, amended amount

$ (5)

Regulatory Matters (Regulator_5

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - Duke Energy Indiana - IURC - Indiana rate case 2019 - USD ($) $ in Millions	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 395
Requested rate increase, percentage, net of tax		15.60%
Requested rate increase (decrease), amended amount		$ 396
Approved rate increase (decrease), amount	$ 146
Public Utilities, Approved Rate Increase (Decrease), Percentage	5.70%
Approved return on equity percentage	9.70%
Public utilities, approved equity capital structure, percentage	53.00%
Rate base	$ 10,200
Reduction of requested rate base	$ 200
Reduction due to depreciation methodology	50.00%
Reduction due to approved return on equity	20.00%
Requested return on equity, percent	10.40%
Reduction due to earnings adjustments	20.00%

Regulatory Matters (Regulator_6

Regulatory Matters (Regulatory Matters Narrative - Piedmont) (Details) - Subsequent event - 2020 Tennessee Rate Case [Member] - TPUC - Piedmont Natural Gas $ in Millions	Jul. 02, 2020USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 30
Increase in Annual Revenue, Percent	15.00%

Regulatory Matters (Other Regul

Regulatory Matters (Other Regulatory Matters) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 02, 2014
Public Utilities, General Disclosures [Line Items]
Income (Loss) from Equity Method Investments	$ 1,968	$ (44)	$ 1,924	$ (87)
Current Liabilities: Other	2,898		2,898			$ 2,367
Income tax benefit	(316)	141	(179)	236
Asset retirement obligations	729		729			881
Public utilities, property, plant and equipment, net	104,325		104,325			102,127
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	488		488			611
Income tax benefit	37	74	102	137
Asset retirement obligations	194		194			206
Public utilities, property, plant and equipment, net	32,970		32,970			32,397
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	468		468			478
Income tax benefit	26	$ 33	68	$ 77
Asset retirement obligations	357		357			485
Public utilities, property, plant and equipment, net	22,845		22,845			$ 22,934
Generation facilities evaluated for retirement | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	693		693
Generation facilities evaluated for retirement | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	1,200		1,200
ACP
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	920		920
ACP | ACP
Public Utilities, General Disclosures [Line Items]
Income (Loss) from Equity Method Investments	2,000		(2,000)
Current Liabilities: Other	920		920
Income tax benefit			374
Expected costs (less than)	100		100
ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage							47.00%
Dominion resources | ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					53.00%
Southern Company Gas | ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage							5.00%
Current liabilities | ACP | ACP
Public Utilities, General Disclosures [Line Items]
Asset retirement obligations	60		60
Guarantees of outstanding debt	$ 860		$ 860

Regulatory Matters (Schedule of

Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)MW	Dec. 31, 2019USD ($)
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 104,325	$ 102,127
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	32,970	32,397
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 11,264	$ 11,072
Generation facilities to be retired
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	5,002
Public utilities, property, plant and equipment, net	$ 2,904
Generation facilities to be retired | Allen Steam Station Units 1-3 | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	585
Public utilities, property, plant and equipment, net	$ 145
Generation facilities to be retired | Gallagher Units 2 and 4 | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	280
Public utilities, property, plant and equipment, net	$ 116
Generation facilities to be retired | Gibson Units 1-5 | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	3,132
Public utilities, property, plant and equipment, net	$ 1,690
Generation facilities to be retired | Cayuga Units 1-2 | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,005
Public utilities, property, plant and equipment, net	$ 953

Commitments and Contingencies_2

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 55	$ 58
Environmental exit costs, reasonably possible additional loss	59
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	10	11
Environmental exit costs, reasonably possible additional loss	11
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	14	16
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	5	4
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	8	9
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	19	19
Environmental exit costs, reasonably possible additional loss	42
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	5	4
Piedmont Natural Gas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 7	$ 8

Commitments and Contingencies_3

Commitments and Contingencies (Narrative) (Details) $ in Millions	Jun. 18, 2018USD ($)	Jun. 30, 2020USD ($)plantclaim	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
ASU 2016-13 | ACP
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees			$ 95
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC Plants with Ash Basins | plant		15
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		$ 590		$ 604
Reinsurance retention policy, excess retention, amount reinsured		747
Probable insurance recoveries		$ 742		$ 742
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Non-malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		118
Asbestos-related injuries and damages reserves		$ 27
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		59
Asbestos-related injuries and damages reserves		$ 20
Duke Energy Progress | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 100
Duke Energy Florida | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 203
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables		15
Other Noncurrent Liabilities [Member] | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees		4
ACP | Other Current Liabilities [Member] | ACP
Loss Contingencies [Line Items]
Guarantees of outstanding debt		$ 860

Commitments and Contingencies_4

Commitments and Contingencies (Schedule of Legal Reserves) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Reserves for legal matters	$ 60	$ 62
Duke Energy Carolinas
Loss Contingencies [Line Items]
Reserves for legal matters	3	2
Progress Energy
Loss Contingencies [Line Items]
Reserves for legal matters	52	55
Duke Energy Progress
Loss Contingencies [Line Items]
Reserves for legal matters	9	12
Duke Energy Florida
Loss Contingencies [Line Items]
Reserves for legal matters	23	22
Piedmont Natural Gas
Loss Contingencies [Line Items]
Reserves for legal matters	$ 1	$ 1

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Debt issuances	$ 3,250,000,000
Repayments of long-term debt	1,951,000,000	$ 2,155,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy (Parent) | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	900,000,000
Repayments of long-term debt	454,000,000	3,000,000
Duke Energy Florida
Debt Instrument [Line Items]
Debt issuances	500,000,000
Repayments of long-term debt	537,000,000	136,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances	400,000,000
Repayments of long-term debt		451,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances	550,000,000
Repayments of long-term debt		60,000,000
Piedmont Natural Gas
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
Repayments of long-term debt		$ 350,000,000
Unsecured Debt | May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
Unsecured Debt | May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt issuances	$ 400,000,000
Unsecured Debt | Duke Energy (Parent) | May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
Unsecured Debt | Piedmont Natural Gas | May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
First Mortgage Bonds | January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
Repayments of long-term debt	$ 450,000,000
First Mortgage Bonds | January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Interest Rate	3.20%
Debt issuances	$ 400,000,000
First Mortgage Bonds | March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Interest Rate	2.75%
Debt issuances	$ 550,000,000
Repayments of long-term debt	$ 500,000,000
First Mortgage Bonds | May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.125%
Debt issuances	$ 400,000,000
First Mortgage Bonds | June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Interest Rate	1.75%
Debt issuances	$ 500,000,000
First Mortgage Bonds | Duke Energy Carolinas | January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds | Duke Energy Carolinas | January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds | Duke Energy Florida | June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds | Duke Energy Ohio | May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds | Duke Energy Indiana | March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Debt issuances	$ 550,000,000

Debt and Credit Facilities (S_2

Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 3,756	$ 3,141
Other debt obligations
Debt Instrument [Line Items]
Current maturities of long-term debt	346
Duke Energy Progress
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,006	1,006
Duke Energy Progress | Unsecured Debt | Debt maturing December 2020, floating interest rate
Debt Instrument [Line Items]
Interest Rate	0.986%
Current maturities of long-term debt	$ 700
Duke Energy Progress | First Mortgage Bonds | Bonds maturing September 2020, floating interest rate
Debt Instrument [Line Items]
Interest Rate	0.498%
Current maturities of long-term debt	$ 300
Progress Energy
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,829	1,577
Progress Energy | Unsecured Debt | Debt maturing January 2021, 4.400% interest rate
Debt Instrument [Line Items]
Interest Rate	4.40%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Unsecured Debt | Debt maturing March 2021, floating interest rate
Debt Instrument [Line Items]
Interest Rate	0.924%
Current maturities of long-term debt	$ 500
Piedmont Natural Gas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 160
Piedmont Natural Gas | Unsecured Debt | Debt Maturing June 2021, 4.240% interest rate
Debt Instrument [Line Items]
Interest Rate	4.24%
Current maturities of long-term debt	$ 160
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 323	571
Duke Energy Florida | Secured Debt | Debt Maturing April 2021, floating interest rate
Debt Instrument [Line Items]
Interest Rate	1.384%
Current maturities of long-term debt	$ 250
Duke Energy Indiana
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 503	503
Duke Energy Indiana | First Mortgage Bonds | Bonds maturing July 2020, 3.750% interest rate
Debt Instrument [Line Items]
Interest Rate	3.75%
Current maturities of long-term debt	$ 500
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 508	$ 458
Duke Energy Carolinas | First Mortgage Bonds | Bonds Maturing June 2021, 3.900% interest rate
Debt Instrument [Line Items]
Interest Rate	3.90%
Current maturities of long-term debt	$ 500

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details) - USD ($)	Mar. 27, 2020	Mar. 19, 2020	Jun. 30, 2020	Mar. 31, 2020
Master Credit Facility
Debt Instrument [Line Items]
Facility size			$ 8,000,000,000	$ 8,000,000,000
Term Loan Facility | 364-day Term Loan Credit Agreement | Duke Energy (Parent)
Debt Instrument [Line Items]
Facility size				1,500,000,000
Borrowing amount	$ 188,000,000	$ 1,500,000,000
Increase in borrowing limit				$ 500,000,000

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Jun. 30, 2020	Mar. 31, 2020
Line of Credit Facility [Line Items]
Facility size	$ 8,000,000,000	$ 8,000,000,000
Commercial paper	(2,480,000,000)
Outstanding letters of credit	(47,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,392,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,500,000,000
Commercial paper	(389,000,000)
Outstanding letters of credit	(3,000,000)
Available capacity under the Master Credit Facility	1,108,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,250,000,000
Commercial paper	(323,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	925,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(156,000,000)
Available capacity under the Master Credit Facility	644,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(79,000,000)
Available capacity under the Master Credit Facility	521,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(150,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	369,000,000
Piedmont Natural Gas
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(135,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	463,000,000
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants
Line of Credit Facility [Line Items]
Commercial paper	(625,000,000)
Duke Energy (Parent) | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility size	2,650,000,000
Commercial paper	(1,248,000,000)
Outstanding letters of credit	(40,000,000)
Available capacity under the Master Credit Facility	$ 1,362,000,000

Debt and Credit Facilities (S_3

Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - USD ($)	1 Months Ended		6 Months Ended
	May 31, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Line of Credit Facility [Line Items]
Repayments of long-term debt			$ 1,951,000,000	$ 2,155,000,000
Master Credit Facility
Line of Credit Facility [Line Items]
Facility size		$ 8,000,000,000	8,000,000,000
Duke Energy (Parent) | Master Credit Facility
Line of Credit Facility [Line Items]
Repayments of long-term debt			500,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Repayments of long-term debt			13,000,000	$ 602,000,000
Duke Energy Progress | Master Credit Facility
Line of Credit Facility [Line Items]
Facility size			1,250,000,000
Duke Energy Progress | Term Loan Facility
Line of Credit Facility [Line Items]
Facility size			700,000,000
Amount drawn			$ 700,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Master Credit Facility
Line of Credit Facility [Line Items]
Facility Term			3 years
Additional amount drawn		$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Duke Energy (Parent) | Master Credit Facility
Line of Credit Facility [Line Items]
Facility size			$ 1,000,000,000
Amount drawn			$ 500,000,000

Goodwill (Rollforward of Goodwi

Goodwill (Rollforward of Goodwill) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill balance	$ 19,425	$ 19,425
Accumulated impairment charges	(122)	(122)
Goodwill, adjusted for accumulated impairment charges	19,303	19,303
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	17,379	17,379
Goodwill, adjusted for accumulated impairment charges	17,379	17,379
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	1,924	1,924
Goodwill, adjusted for accumulated impairment charges	1,924	1,924
Commercial Renewables
Goodwill [Line Items]
Goodwill balance	122	122
Accumulated impairment charges	$ (122)	$ (122)

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 19,303,000,000	$ 19,303,000,000
Accumulated impairment charges	122,000,000	122,000,000
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	17,379,000,000	17,379,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	1,924,000,000	1,924,000,000
Duke Energy Ohio
Goodwill [Line Items]
Goodwill	920,000,000	920,000,000
Accumulated impairment charges	216,000,000	216,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	596,000,000	596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	324,000,000	324,000,000
Progress Energy [Member]
Goodwill [Line Items]
Goodwill	3,655,000,000	3,655,000,000
Progress Energy [Member] | Electric Utilities and Infrastructure
Goodwill [Line Items]
Accumulated impairment charges	0	0
Piedmont Natural Gas [Member]
Goodwill [Line Items]
Goodwill	49,000,000	49,000,000
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure
Goodwill [Line Items]
Accumulated impairment charges	$ 0	$ 0

Related Party Transactions (Oth

Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Duke Energy Carolinas | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 196	$ 197	$ 330	$ 409
Duke Energy Carolinas | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	10	10
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	20	20	44	113
Related party transaction, other revenues from transactions with related party	3	17	10	40
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	10	3	16	7
Progress Energy | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	189	183	335	359
Progress Energy | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	9	10	18	19
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3	17	10	40
Related party transaction, other revenues from transactions with related party	20	20	44	113
Progress Energy | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19	38	38
Duke Energy Progress | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	113	108	188	214
Duke Energy Progress | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	4	9	8
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3	17	10	40
Related party transaction, other revenues from transactions with related party	20	20	44	113
Duke Energy Progress | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19	38	38
Duke Energy Florida | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	76	75	147	145
Duke Energy Florida | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	4	6	9	11
Duke Energy Ohio | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	77	83	161	168
Duke Energy Ohio | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	2	2
Duke Energy Indiana | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	92	93	198	190
Duke Energy Indiana | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1	4	3
Piedmont Natural Gas | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	37	37	71	69
Piedmont Natural Gas | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			1	1
Piedmont Natural Gas | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	29	22	54	45
Piedmont Natural Gas | Natural gas storage and transportation costs | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6	$ 6	$ 12	$ 11

Related Party Transactions (Int

Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Duke Energy Carolinas
Related Party Transaction [Line Items]
Income tax payable	$ 19	$ 5
Progress Energy
Related Party Transaction [Line Items]
Income taxes receivable	63	125
Duke Energy Progress
Related Party Transaction [Line Items]
Income taxes receivable		28
Income tax payable	7
Duke Energy Florida
Related Party Transaction [Line Items]
Income tax payable	51	2
Duke Energy Ohio
Related Party Transaction [Line Items]
Income taxes receivable		9
Income tax payable	1
Duke Energy Indiana
Related Party Transaction [Line Items]
Income taxes receivable	10	28
Piedmont Natural Gas
Related Party Transaction [Line Items]
Income taxes receivable	$ 23	$ 13

Derivatives and Hedging (Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)GWhMcf	Dec. 31, 2019USD ($)GWhMcf
Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 2,127	$ 2,270
Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	28,179	15,858
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	707	704
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 650	$ 993
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	1,477	1,277
VIE primary beneficiary | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	650	693
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 450
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	147	130
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 450
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	165	160
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 800
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 250
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	165	160
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,050	$ 250
Duke Energy Florida | Interest Rate Contracts
Derivative [Line Items]
Notional amount		550
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		550
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	4,405	1,887
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Indiana | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	23,774	13,971
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	4	3
Piedmont Natural Gas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of decatherms) | Mcf	391	411

Derivatives and Hedging (Narrat

Derivatives and Hedging (Narrative) (Details) $ in Millions	1 Months Ended
	Apr. 30, 2020USD ($)
Not Designated as Hedging Instruments | Duke Energy Florida | Equity Securities Contracts
Derivative [Line Items]
Proceeds liquidation of options	$ 7

Derivatives and Hedging (Locati

Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	$ 32	$ 25
Location and fair value amounts of derivatives (Liability)	361	300
Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	23	24
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	9	1
Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	137	118
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	224	182
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	27	18
Location and fair value amounts of derivatives (Liability)	193	223
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	5	6
Location and fair value amounts of derivatives (Liability)	168	53
Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	20	17
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7	1
Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	55	67
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	138	156
Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	68	8
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	30	5
Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	14	19
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	56	21
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7
Location and fair value amounts of derivatives (Liability)	57	49
Duke Energy Carolinas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	5
Duke Energy Carolinas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	49	39
Duke Energy Carolinas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	8	10
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7
Location and fair value amounts of derivatives (Liability)	37	43
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	20	6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	5
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	29	33
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	8	10
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	20	6
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8	7
Location and fair value amounts of derivatives (Liability)	121	88
Progress Energy | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	7
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4
Progress Energy | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	65	51
Progress Energy | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	56	37
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3
Location and fair value amounts of derivatives (Liability)	49	63
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	5	6
Location and fair value amounts of derivatives (Liability)	72	1
Progress Energy | Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	17	26
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	32	37
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	48	1
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	24
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8
Location and fair value amounts of derivatives (Liability)	105	49
Duke Energy Progress | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4
Duke Energy Progress | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	65	27
Duke Energy Progress | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	40	22
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3
Location and fair value amounts of derivatives (Liability)	33	48
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	5
Location and fair value amounts of derivatives (Liability)	72	1
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	17	26
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	16	22
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	48	1
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	24
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		7
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		7
Duke Energy Florida | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		6
Duke Energy Florida | Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		6
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	4
Location and fair value amounts of derivatives (Liability)	7	6
Duke Energy Ohio | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	3
Duke Energy Ohio | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Ohio | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	5
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	4
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	3
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	5
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	13
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Indiana | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	13
Duke Energy Indiana | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	13
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	13
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Piedmont Natural Gas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Location and fair value amounts of derivatives (Liability)	105	117
Piedmont Natural Gas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Piedmont Natural Gas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	7
Piedmont Natural Gas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	98	110
Piedmont Natural Gas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Location and fair value amounts of derivatives (Liability)	105	117
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	4	1
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	7
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	$ 98	$ 110

Derivatives and Hedging (Schedu

Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 32	$ 25
Net amounts recognized on the Condensed Consolidated Balance Sheet	32	25
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	23	24
Gross amounts offset	(3)	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	20	23
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	9	1
Gross amounts offset	(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet	5	1
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	7
Net amounts recognized on the Condensed Consolidated Balance Sheet	7
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2
Gross amounts offset	(2)
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	5
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	3
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	7
Net amounts recognized on the Condensed Consolidated Balance Sheet	8	7
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	7
Gross amounts offset	(1)	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	3	6
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	2
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8
Net amounts recognized on the Condensed Consolidated Balance Sheet	8
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4
Gross amounts offset	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	3
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	2
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		7
Net amounts recognized on the Condensed Consolidated Balance Sheet		7
Duke Energy Florida | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		7
Gross amounts offset		(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet		6
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	3	4
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	3	3
Net amounts recognized on the Condensed Consolidated Balance Sheet	3	3
Duke Energy Ohio | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		1
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	13
Net amounts recognized on the Condensed Consolidated Balance Sheet	10	13
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	13
Net amounts recognized on the Condensed Consolidated Balance Sheet	10	13
Piedmont Natural Gas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	4	1
Piedmont Natural Gas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 4	$ 1

Derivatives and Hedging (Sche_2

Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 361	$ 300
Net amounts recognized on the Condensed Consolidated Balance Sheet	361	277
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	137	118
Gross amounts offset	(3)	(24)
Net amounts recognized on the Condensed Consolidated Balance Sheet	134	94
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	224	182
Gross amounts offset	(4)
Net amounts recognized on the Condensed Consolidated Balance Sheet	220	182
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	57	49
Net amounts recognized on the Condensed Consolidated Balance Sheet	57	49
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	49	39
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	47	39
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	8	10
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	6	10
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	121	88
Net amounts recognized on the Condensed Consolidated Balance Sheet	121	65
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	65	51
Gross amounts offset	(1)	(24)
Net amounts recognized on the Condensed Consolidated Balance Sheet	64	27
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	56	37
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	54	37
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	105	49
Net amounts recognized on the Condensed Consolidated Balance Sheet	105	49
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	65	27
Gross amounts offset	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	64	27
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	40	22
Gross amounts offset	(2)
Net amounts recognized on the Condensed Consolidated Balance Sheet	38	22
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		24
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		24
Gross amounts offset		(24)
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	6
Duke Energy Ohio | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	1
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	6	5
Net amounts recognized on the Condensed Consolidated Balance Sheet	6	5
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	1
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	1
Piedmont Natural Gas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	105	117
Net amounts recognized on the Condensed Consolidated Balance Sheet	105	117
Piedmont Natural Gas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	7
Net amounts recognized on the Condensed Consolidated Balance Sheet	7	7
Piedmont Natural Gas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	98	110
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 98	$ 110

Derivatives and Hedging (Deriva

Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	$ 63	$ 79
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	63	79
Duke Energy Carolinas
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	29	35
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	29	35
Progress Energy
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	34	44
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	34	44
Duke Energy Progress
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	34	44
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$ 34	$ 44

Investments in Debt and Equit_3

Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale
Estimated Fair Value	$ 2,532
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,257	$ 3,675
Unrealized Holding Losses	98	57
Estimated Fair Value	8,531	8,562
NDTF
Available-for-sale Securities
Cash and cash equivalents	731	101
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	3,034	3,523
Equity Securities, FV-NI, Accumulated Unrealized Loss	92	55
Equity securities, FV-NI	5,039	5,661
Debt Securities, Available-for-sale
Estimated Fair Value	2,230	2,368
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,189	3,609
Unrealized Holding Losses	96	57
Estimated Fair Value	8,000	8,130
Other Investments
Available-for-sale Securities
Cash and cash equivalents	113	52
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	51	57
Equity securities, FV-NI	116	122
Debt Securities, Available-for-sale
Estimated Fair Value	302	258
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	68	66
Unrealized Holding Losses	2
Estimated Fair Value	531	432
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,239
Duke Energy Carolinas | NDTF
Available-for-sale Securities
Cash and cash equivalents	30	21
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,796	1,914
Equity Securities, FV-NI, Accumulated Unrealized Loss	47	8
Equity securities, FV-NI	2,989	3,154
Debt Securities, Available-for-sale
Estimated Fair Value	1,239	1,172
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,880	1,957
Unrealized Holding Losses	50	10
Estimated Fair Value	4,258	4,347
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,043
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,313	1,655
Unrealized Holding Losses	46	47
Estimated Fair Value	3,902	3,883
Progress Energy | NDTF
Available-for-sale Securities
Cash and cash equivalents	701	80
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,238	1,609
Equity Securities, FV-NI, Accumulated Unrealized Loss	45	47
Equity securities, FV-NI	2,050	2,507
Debt Securities, Available-for-sale
Estimated Fair Value	991	1,196
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,309	1,652
Unrealized Holding Losses	46	47
Estimated Fair Value	3,742	3,783
Progress Energy | Other Investments
Available-for-sale Securities
Cash and cash equivalents	108	49
Debt Securities, Available-for-sale
Estimated Fair Value	52	51
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4	3
Estimated Fair Value	160	100
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	991
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,247	1,300
Unrealized Holding Losses	46	21
Estimated Fair Value	3,032	3,053
Duke Energy Progress | NDTF
Available-for-sale Securities
Cash and cash equivalents	63	53
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,176	1,258
Equity Securities, FV-NI, Accumulated Unrealized Loss	45	21
Equity securities, FV-NI	1,977	2,077
Debt Securities, Available-for-sale
Estimated Fair Value	991	921
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,247	1,300
Unrealized Holding Losses	46	21
Estimated Fair Value	3,031	3,051
Duke Energy Progress | Other Investments
Available-for-sale Securities
Cash and cash equivalents	1	2
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Estimated Fair Value	1	2
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	52
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	66	355
Unrealized Holding Losses		26
Estimated Fair Value	765	787
Duke Energy Florida | NDTF
Available-for-sale Securities
Cash and cash equivalents	638	27
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	62	351
Equity Securities, FV-NI, Accumulated Unrealized Loss		26
Equity securities, FV-NI	73	430
Debt Securities, Available-for-sale
Estimated Fair Value		275
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	62	352
Unrealized Holding Losses		26
Estimated Fair Value	711	732
Duke Energy Florida | Other Investments
Available-for-sale Securities
Cash and cash equivalents	2	4
Debt Securities, Available-for-sale
Estimated Fair Value	52	51
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4	3
Estimated Fair Value	54	55
Duke Energy Indiana
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	39	43
Equity securities, FV-NI	77	81
Debt Securities, Available-for-sale
Estimated Fair Value	45
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	40	44
Unrealized Holding Losses	1
Estimated Fair Value	122	125
Duke Energy Indiana | Other Investments
Equity Securities, FV-NI
Equity securities, FV-NI	77	81
Debt Securities, Available-for-sale
Estimated Fair Value	45	44
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	66	37
Gross Unrealized Holding Losses	2	1
Estimated Fair Value	806	603
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	8	3
Estimated Fair Value	125	67
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	41	21
Gross Unrealized Holding Losses	2	1
Estimated Fair Value	519	361
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	25	16
Estimated Fair Value	287	242
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	25	16
Estimated Fair Value	287	242
Corporate debt securities | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	3	6
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	18	13
Gross Unrealized Holding Losses	1
Estimated Fair Value	417	368
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	4
Gross Unrealized Holding Losses	1
Estimated Fair Value	103	94
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	6	3
Estimated Fair Value	133	96
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	10
Gross Unrealized Holding Losses	1
Estimated Fair Value	284	272
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	3
Estimated Fair Value	52	51
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	10
Gross Unrealized Holding Losses	1
Estimated Fair Value	284	272
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	3
Estimated Fair Value	52	51
Municipal bonds | Duke Energy Indiana
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1
Estimated Fair Value	39	36
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	62	33
Gross Unrealized Holding Losses		1
Estimated Fair Value	813	1,256
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	2
Estimated Fair Value	40	41
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	30	16
Gross Unrealized Holding Losses		1
Estimated Fair Value	399	578
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	32	17
Estimated Fair Value	414	678
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	32	16
Estimated Fair Value	414	403
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value		275
U.S. government bonds | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	3	2
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	9	3
Gross Unrealized Holding Losses	1
Estimated Fair Value	194	141
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	1
Estimated Fair Value	34	56
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	7	3
Gross Unrealized Holding Losses	1
Estimated Fair Value	188	137
Other debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2
Estimated Fair Value	6	4
Other debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2
Estimated Fair Value	$ 6	$ 4

Investments in Debt and Equit_4

Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
FV-NI:
Realized gains	$ 302	$ 66	$ 325	$ 101
Realized losses	67	63	132	93
AFS:
Realized gains	27	47	47	57
Realized losses	13	36	19	47
Duke Energy Carolinas
FV-NI:
Realized gains	27	44	36	67
Realized losses	25	48	70	69
AFS:
Realized gains	18	16	30	25
Realized losses	8	11	13	21
Progress Energy
FV-NI:
Realized gains	275	22	289	34
Realized losses	42	15	62	24
AFS:
Realized gains	6	30	11	31
Realized losses	4	25	5	26
Duke Energy Progress
FV-NI:
Realized gains	26	7	40	17
Realized losses	27	7	47	15
AFS:
Realized gains	6	1	11	2
Realized losses	4	1	5	2
Duke Energy Florida
FV-NI:
Realized gains	249	15	249	17
Realized losses	$ 15	8	$ 15	9
AFS:
Realized gains		29		29
Realized losses		$ 24		$ 24

Investments in Debt and Equit_5

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions	Jun. 30, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 63
Due after one through five years	563
Due after five through 10 years	587
Due after 10 years	1,319
Total	2,532
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	19
Due after one through five years	254
Due after five through 10 years	270
Due after 10 years	696
Total	1,239
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	30
Due after one through five years	244
Due after five through 10 years	226
Due after 10 years	543
Total	1,043
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	28
Due after one through five years	235
Due after five through 10 years	219
Due after 10 years	509
Total	991
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	2
Due after one through five years	9
Due after five through 10 years	7
Due after 10 years	34
Total	52
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	3
Due after one through five years	15
Due after five through 10 years	9
Due after 10 years	18
Total	$ 45

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 2,532
Derivative assets	32	$ 25
Total assets	8,563	8,610
Derivative liabilities	(361)	(277)
Net assets (liabilities)	8,202	8,310
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	4	3
Total assets	6,327	6,675
Derivative liabilities	(1)	(15)
Net assets (liabilities)	6,326	6,660
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	15	7
Total assets	2,175	1,869
Derivative liabilities	(255)	(145)
Net assets (liabilities)	1,920	1,701
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	13	15
Total assets	13	15
Derivative liabilities	(105)	(117)
Net assets (liabilities)	(92)	(102)
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	48	51
Net assets (liabilities)	48	51
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	731	101
Equity securities, FV-NI	5,039	5,661
Debt securities, available-for-sale	2,230	2,368
NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	731	101
Debt securities, available-for-sale	336	725
NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,894	1,643
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	5,039	5,684
NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	4,991	5,633
NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	48	51
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	113	52
Equity securities, FV-NI	116	122
Debt securities, available-for-sale	302	258
Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	113	52
Equity securities, FV-NI	116	122
Debt securities, available-for-sale	36	39
Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	266	219
NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,239
Derivative assets	7
Total assets	4,265	4,347
Derivative liabilities	(57)	(49)
Net assets (liabilities)	4,208	4,298
Duke Energy Carolinas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,096	3,330
Net assets (liabilities)	3,096	3,330
Duke Energy Carolinas | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	7
Total assets	1,121	966
Derivative liabilities	(57)	(49)
Net assets (liabilities)	1,064	917
Duke Energy Carolinas | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	48	51
Net assets (liabilities)	48	51
Duke Energy Carolinas | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	30	21
Equity securities, FV-NI	2,989	3,154
Debt securities, available-for-sale	1,239	1,172
Duke Energy Carolinas | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	30	21
Debt securities, available-for-sale	125	206
Duke Energy Carolinas | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,114	966
Duke Energy Carolinas | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,989	3,154
Duke Energy Carolinas | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,941	3,103
Duke Energy Carolinas | NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	48	51
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,043
Derivative assets	8	7
Total assets	3,910	3,913
Derivative liabilities	(121)	(65)
Net assets (liabilities)	3,789	3,825
Progress Energy | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,070	3,178
Net assets (liabilities)	3,070	3,178
Progress Energy | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	8	7
Total assets	840	735
Derivative liabilities	(121)	(65)
Net assets (liabilities)	719	647
Progress Energy | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	701	80
Equity securities, FV-NI	2,050	2,507
Debt securities, available-for-sale	991	1,196
Progress Energy | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	701	80
Debt securities, available-for-sale	211	519
Progress Energy | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	780	677
Progress Energy | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,050	2,530
Progress Energy | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,050	2,530
Progress Energy | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	108	49
Debt securities, available-for-sale	52	51
Progress Energy | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	108	49
Progress Energy | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	52	51
Progress Energy | NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Progress Energy | NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	991
Derivative assets	8
Total assets	3,040	3,053
Derivative liabilities	(105)	(49)
Net assets (liabilities)	2,935	3,004
Duke Energy Progress | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	2,252	2,376
Net assets (liabilities)	2,252	2,376
Duke Energy Progress | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	8
Total assets	788	677
Derivative liabilities	(105)	(49)
Net assets (liabilities)	683	628
Duke Energy Progress | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	63	53
Equity securities, FV-NI	1,977	2,077
Debt securities, available-for-sale	991	921
Duke Energy Progress | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	63	53
Debt securities, available-for-sale	211	244
Duke Energy Progress | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	780	677
Duke Energy Progress | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	1,977	2,077
Duke Energy Progress | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	1,977	2,077
Duke Energy Progress | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	2
Duke Energy Progress | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	2
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	52
Derivative assets		7
Total assets	765	817
Derivative liabilities		(1)
Net assets (liabilities)	765	793
Duke Energy Florida | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	713	759
Net assets (liabilities)	713	759
Duke Energy Florida | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		7
Total assets	52	58
Derivative liabilities		(1)
Net assets (liabilities)	52	34
Duke Energy Florida | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	638	27
Equity securities, FV-NI	73	430
Debt securities, available-for-sale		275
Duke Energy Florida | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	638	27
Debt securities, available-for-sale		275
Duke Energy Florida | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0
Duke Energy Florida | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	73	453
Duke Energy Florida | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	73	453
Duke Energy Florida | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	4
Debt securities, available-for-sale	52	51
Duke Energy Florida | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	4
Duke Energy Florida | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	52	51
Duke Energy Florida | NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Florida | NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	77	81
Debt securities, available-for-sale	45
Derivative assets	10	13
Total assets	132	138
Derivative liabilities	(1)	(1)
Net assets (liabilities)	131	137
Duke Energy Indiana | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		2
Total assets	77	83
Derivative liabilities	(1)	(1)
Net assets (liabilities)	76	82
Duke Energy Indiana | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	45	44
Net assets (liabilities)	45	44
Duke Energy Indiana | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	10	11
Total assets	10	11
Net assets (liabilities)	10	11
Duke Energy Indiana | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	77	81
Debt securities, available-for-sale	45	44
Duke Energy Indiana | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	77	81
Duke Energy Indiana | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	45	44
Piedmont Natural Gas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	4	1
Derivative liabilities	(105)	(117)
Net assets (liabilities)	(101)	(116)
Piedmont Natural Gas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	4	1
Net assets (liabilities)	4	1
Piedmont Natural Gas | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(105)	(117)
Net assets (liabilities)	$ (105)	$ (117)

Fair Value Measurements (Reconc

Fair Value Measurements (Reconciliation of Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivatives (net)
Balance at beginning of period	$ (88)	$ (115)	$ (102)	$ (113)
Purchases, sales, issuances and settlements:
Purchases	14	38	14	38
Settlements	(6)	(11)	(15)	(23)
Total (losses) gains included on the Condensed Consolidated Balance Sheet	(12)	9	11	19
Balance at end of period	(92)	(79)	(92)	(79)
Duke Energy Indiana
Derivatives (net)
Balance at beginning of period	2	5	11	22
Purchases, sales, issuances and settlements:
Purchases	10	29	10	29
Settlements	(4)	(9)	(10)	(19)
Total (losses) gains included on the Condensed Consolidated Balance Sheet	2	3	(1)	(4)
Balance at end of period	10	28	10	28
Piedmont Natural Gas
Derivatives (net)
Balance at beginning of period	(91)	(121)	(117)	(141)
Purchases, sales, issuances and settlements:
Total gains and settlements	(14)	7	12	27
Balance at end of period	$ (105)	$ (114)	$ (105)	$ (114)

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions	Jun. 30, 2020USD ($)$ / MWh$ / MMBTU	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)$ / MWh$ / MMBTU	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (92)	$ (88)	$ (102)	$ (79)	$ (115)	$ (113)
Duke Energy Ohio | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 3		$ 4
Duke Energy Ohio | FTRs | Minimum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	0.23		0.59
Duke Energy Ohio | FTRs | Maximum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	1.45		3.47
Duke Energy Ohio | FTRs | Weighted Average | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	0.69		2.07
Duke Energy Indiana
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 10	2	$ 11	28	5	22
Duke Energy Indiana | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 10		$ 11
Duke Energy Indiana | FTRs | Minimum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	(1.03)		(0.66)
Duke Energy Indiana | FTRs | Maximum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	6.19		9.24
Duke Energy Indiana | FTRs | Weighted Average | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MWh	0.71		1.15
Piedmont Natural Gas
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (105)	$ (91)	$ (117)	$ (114)	$ (121)	$ (141)
Piedmont Natural Gas | Natural gas contracts | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (105)		$ (117)
Piedmont Natural Gas | Natural gas contracts | Minimum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	1.73		1.59
Piedmont Natural Gas | Natural gas contracts | Maximum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	2.39		2.46
Piedmont Natural Gas | Natural gas contracts | Weighted Average | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	2.01		1.91

Fair Value Measurements (Other

Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	$ 59,899	$ 58,126
Long-term debt, fair value	68,428	63,062
Piedmont Natural Gas and Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt discount (premium), net	1,400	1,500
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	12,521	11,900
Long-term debt, fair value	15,046	13,516
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	19,604	19,634
Long-term debt, fair value	23,476	22,291
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	9,063	9,058
Long-term debt, fair value	10,506	9,934
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	7,951	7,987
Long-term debt, fair value	9,655	9,131
Duke Energy Ohio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	3,019	2,619
Long-term debt, fair value	3,551	2,964
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	4,603	4,057
Long-term debt, fair value	5,617	4,800
Piedmont Natural Gas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	2,779	2,384
Long-term debt, fair value	$ 3,289	$ 2,642

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) - USD ($)	Mar. 31, 2018	Jun. 30, 2020	Dec. 31, 2019
FES
Variable Interest Entities [Line Items]
Power participation ratio	4.85%
VIE primary beneficiary
Variable Interest Entities [Line Items]
Variable interest entity, financial or other support, amount		$ 0	$ 0
VIE primary beneficiary | CRC
Variable Interest Entities [Line Items]
Percent of proceeds received as cash		75.00%
Percent of proceeds received as subordinated note		25.00%
Minimum equity balance required by Cinergy Receivables		$ 3,000,000
VIE not primary beneficiary | OVEC
Variable Interest Entities [Line Items]
Variable interest entity ownership interest		9.00%

Variable Interest Entities (Sch

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Long-Term Debt	$ 56,143,000,000	$ 54,985,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Long-Term Debt	11,713,000,000	11,142,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Long-Term Debt	7,907,000,000	7,902,000,000
Duke Energy Florida
Variable Interest Entities [Line Items]
Long-Term Debt	7,628,000,000	7,416,000,000
CRC | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	350,000,000	350,000,000
Accounts receivable from securitization	454,000,000	522,000,000
DERF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	475,000,000
Long-Term Debt	475,000,000	474,000,000
Accounts receivable from securitization	675,000,000	642,000,000
DEPR | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	333,000,000	325,000,000
Accounts receivable from securitization	451,000,000	489,000,000
DEFR | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	250,000,000
Long-Term Debt	250,000,000	250,000,000
Accounts receivable from securitization	$ 463,000,000	$ 336,000,000

Variable Interest Entities (S_2

Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 1,774	$ 1,796
Current Assets: Other	1,031	764
Other Noncurrent Assets: Regulatory assets	13,285	13,222
Property, Plant and Equipment: Cost	151,592	147,654
Accumulated depreciation and amortization	(47,295)	(45,773)
Other Noncurrent Assets: Other	3,458	3,289
Current Liabilities: Other	2,898	2,367
Current maturities of long-term debt	3,756	3,141
Long-Term Debt	56,143	54,985
Other Noncurrent Liabilities: AROs	12,539	12,437
Other Noncurrent Liabilities: Other	1,563	1,581
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	432	419
Current Assets: Other	44	58
Other Noncurrent Assets: Regulatory assets	1,860	2,194
Property, Plant and Equipment: Cost	21,290	20,457
Accumulated depreciation and amortization	(5,394)	(5,236)
Other Noncurrent Assets: Other	327	311
Current Liabilities: Other	372	415
Current maturities of long-term debt	323	571
Long-Term Debt	7,628	7,416
Other Noncurrent Liabilities: AROs	581	578
Other Noncurrent Liabilities: Other	194	136
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Receivables of VIEs	6	5
Regulatory Assets: Current	53	52
Current Assets: Other	32	39
Other Noncurrent Assets: Regulatory assets	969	989
Current Liabilities: Other	10	10
Current maturities of long-term debt	54	54
Long-Term Debt	1,028	1,057
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Current Assets: Other	228	203
Property, Plant and Equipment: Cost	6,198	5,747
Accumulated depreciation and amortization	(1,145)	(1,041)
Other Noncurrent Assets: Other	75	106
Current maturities of long-term debt	158	162
Long-Term Debt	1,457	1,541
Other Noncurrent Liabilities: AROs	144	127
Other Noncurrent Liabilities: Other	$ 251	$ 228

Variable Interest Entities (S_3

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 861	$ 1,936
Total Assets	160,049	158,838
Taxes accrued	657	392
Current Liabilities: Other	2,898	2,367
Deferred income taxes	8,979	8,878
Other Noncurrent Liabilities: Other	1,563	1,581
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	(1)	(1)
Investments in equity method unconsolidated affiliates	414	1,479
Deferred tax asset	439
Total Assets	852	1,478
Taxes accrued	9	(1)
Current Liabilities: Other	924	4
Deferred income taxes		59
Other Noncurrent Liabilities: Other	10	11
Total liabilities	943	73
Net assets	(91)	1,405
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates		1,179
Deferred tax asset	439
Total Assets	439	1,179
Taxes accrued	9	(1)
Current Liabilities: Other	920
Deferred income taxes		59
Total liabilities	929	58
Net assets	(490)	1,121
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	(1)	(1)
Investments in equity method unconsolidated affiliates	413	300
Total Assets	412	299
Net assets	412	299
Other VIEs | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	1
Total Assets	1
Current Liabilities: Other	4	4
Other Noncurrent Liabilities: Other	10	11
Total liabilities	14	15
Net assets	(13)	(15)
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables from affiliated companies	47	92
Total Assets	9,609	9,338
Taxes accrued	210	219
Current Liabilities: Other	71	75
Deferred income taxes	958	922
Other Noncurrent Liabilities: Other	96	94
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	34	64
Total Assets	34	64
Net assets	34	64
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables from affiliated companies	59	79
Total Assets	13,852	13,276
Taxes accrued	46	49
Current Liabilities: Other	104	112
Deferred income taxes	1,195	1,150
Other Noncurrent Liabilities: Other	12	18
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	49	77
Total Assets	49	77
Net assets	$ 49	$ 77

Variable Interest Entities (Pip

Variable Interest Entities (Pipeline Investments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Variable Interest Entities [Line Items]
Net (Loss) Income	$ (1,968)	$ 44	$ (1,924)	$ 87
Investments in joint ventures	861		861		$ 1,936
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in joint ventures	$ 414		$ 414		1,479
ACP
Variable Interest Entities [Line Items]
Ownership percentage	47.00%		47.00%
ACP | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Net (Loss) Income	$ (4,414)	$ 61	$ (4,342)	$ 114
Investments in joint ventures	$ (920)		$ (920)		1,179
Constitution
Variable Interest Entities [Line Items]
Ownership percentage	24.00%		24.00%
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in joint ventures	$ (920)		$ (920)		$ 1,179

Variable Interest Entities (Rec

Variable Interest Entities (Receivables Sold) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 221	$ 253
Less: Retained interests	34	64
Net receivables sold	187	189
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	280	307
Less: Retained interests	49	77
Net receivables sold	$ 231	$ 230

Variable Interest Entities (Sal

Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 429	$ 429	$ 966	$ 1,004
Loss recognized on sale	2	3	6	7
Cash proceeds from receivables sold	431	448	990	1,045
Return received on retained interests		2	2	4
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	583	676	1,230	1,410
Loss recognized on sale	2	4	6	9
Cash proceeds from receivables sold	580	680	1,252	1,438
Return received on retained interests	$ 1	$ 2	$ 3	$ 5

Revenue (Remaining Performance

Revenue (Remaining Performance Obligations) (Details) $ in Millions	Jun. 30, 2020USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 391
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 58
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 92
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 94
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 44
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 45
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 58
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 36
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 4
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 355
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 54
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 84
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 86
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 36
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 37
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 58
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 10
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 5
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 5
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Piedmont Natural Gas
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 658
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, remaining performance obligation, amount	$ 34
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 65
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 64
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 61
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 58
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 376

Revenue (Remaining Performanc_2

Revenue (Remaining Performance Obligations Total) (Details) (Details) $ in Millions	Jun. 30, 2020USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 391
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	36
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	355
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	10
Piedmont Natural Gas
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 658

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,338	$ 5,695	$ 11,159	$ 11,693
Revenue from sources other than contracts with customers	83	178	211	343
Total operating revenues	5,421	5,873	11,370	12,036
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,005	5,361	10,160	10,582
Total operating revenues	5,026	5,467	10,200	10,788
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,249	2,304	4,515	4,674
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,379	1,584	2,887	3,011
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	658	759	1,351	1,470
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	435	527	932	1,068
Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	284	187	475	359
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	271	282	873	1,013
Total operating revenues	265	282	905	1,014
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	157	146	519	560
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	85	244	291
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27	29	68	77
Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	22	42	85
Commercial Renewables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	55	46	113	88
Total operating revenues	123	118	252	224
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	6	13	10
Total operating revenues	7	6	13	10
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,607	1,676	3,355	3,395
Revenue from sources other than contracts with customers	3	37	3	62
Total operating revenues	1,610	1,713	3,358	3,457
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,607	1,676	3,355	3,395
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	677	679	1,433	1,439
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	507	531	1,056	1,027
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	260	289	529	555
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	101	109	215	228
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	62	68	122	146
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,472	2,674	4,860	5,167
Revenue from sources other than contracts with customers	26	70	60	149
Total operating revenues	2,498	2,744	4,920	5,316
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,472	2,674	4,860	5,167
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,173	1,243	2,242	2,357
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	611	750	1,275	1,382
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	212	231	428	453
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	285	351	606	704
Progress Energy | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191	99	309	271
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,222	1,352	2,539	2,795
Revenue from sources other than contracts with customers	21	35	42	76
Total operating revenues	1,243	1,387	2,581	2,871
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,222	1,352	2,539	2,795
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	460	496	962	1,032
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	298	339	617	645
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	154	164	308	325
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	240	309	519	624
Duke Energy Progress | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	70	44	133	169
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,250	1,322	2,321	2,372
Revenue from sources other than contracts with customers		31	9	67
Total operating revenues	1,250	1,353	2,330	2,439
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,250	1,322	2,321	2,372
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	713	747	1,280	1,325
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	313	411	658	737
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58	67	120	128
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	45	42	87	80
Duke Energy Florida | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	121	55	176	102
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	420	429	924	960
Revenue from sources other than contracts with customers	3	4	(3)	4
Total operating revenues	423	433	921	964
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	329	334	681	689
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	169	159	345	348
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	103	105	217	208
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	36	68	69
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	9	12	23
Duke Energy Ohio | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	25	39	41
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	91	95	243	271
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	62	64	159	176
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	26	66	75
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	3	9	10
Duke Energy Ohio | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	2	9	10
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	613	709	1,305	1,473
Revenue from sources other than contracts with customers	4	5	4	9
Total operating revenues	617	714	1,309	1,482
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	613	709	1,305	1,473
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	231	225	496	531
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	161	197	342	394
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	152	201	327	391
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44	59	99	113
Duke Energy Indiana | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	25	27	41	44
Piedmont Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	187	197	648	767
Revenue from sources other than contracts with customers	10	12	61	21
Total operating revenues	197	209	709	788
Piedmont Natural Gas | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	187	197	648	767
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	96	82	360	384
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	59	178	216
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	24	58	66
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	13	17	26
Piedmont Natural Gas | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 11	$ 19	$ 35	$ 75

Revenue (Reserve for Credit Los

Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	$ 89	$ 76
Cumulative Change in Accounting Principle	102	102
Write-Offs	(9)	(19)
Other Adjustments	7	7
Credit Loss Expense	15	33
Balance at June 30, 2020	102	102
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	11	10
Cumulative Change in Accounting Principle	14	10
Write-Offs	(3)	(6)
Credit Loss Expense	6	9
Balance at June 30, 2020	14	14
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	20	16
Cumulative Change in Accounting Principle	29	29
Write-Offs	(3)	(7)
Credit Loss Expense	12	18
Balance at June 30, 2020	29	29
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	9	8
Cumulative Change in Accounting Principle	14	14
Write-Offs	(3)	(5)
Credit Loss Expense	8	10
Balance at June 30, 2020	14	14
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	11	7
Cumulative Change in Accounting Principle	14	7
Write-Offs		(2)
Credit Loss Expense	3	8
Balance at June 30, 2020	14	14
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	5	4
Cumulative Change in Accounting Principle	5	4
Credit Loss Expense		1
Balance at June 30, 2020	5	5
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	3	3
Cumulative Change in Accounting Principle	3	3
Balance at June 30, 2020	3	3
Piedmont Natural Gas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	9	6
Cumulative Change in Accounting Principle	6	6
Write-Offs	(4)	(5)
Credit Loss Expense	1	4
Balance at June 30, 2020	$ 6	6
Cumulative Change in Accounting Principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		5
Cumulative Change in Accounting Principle		5
Cumulative Change in Accounting Principle | Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		2
Cumulative Change in Accounting Principle		2
Cumulative Change in Accounting Principle | Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Piedmont Natural Gas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		$ 1

Revenue (Aging of Trade Receiva

Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 829	$ 843
Trade and Other Receivables, not past due	1,624
Trade and Other Receivables	2,904
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	152
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	90
90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	209
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	332	298
Trade and Other Receivables, not past due	470
Trade and Other Receivables	944
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	49
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	29
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	64
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	274	217
Trade and Other Receivables, not past due	685
Trade and Other Receivables	1,102
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	56
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	34
Progress Energy | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	53
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	137	122
Trade and Other Receivables, not past due	336
Trade and Other Receivables	542
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	28
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	17
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	24
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	137	95
Trade and Other Receivables, not past due	344
Trade and Other Receivables	555
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	28
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	17
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	29
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	1	1
Trade and Other Receivables, not past due	48
Trade and Other Receivables	88
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	4
Duke Energy Ohio | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	29
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	7	16
Trade and Other Receivables, not past due	28
Trade and Other Receivables	47
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1
Duke Energy Indiana | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	10
Piedmont Natural Gas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	6	$ 78
Trade and Other Receivables, not past due	73
Trade and Other Receivables	108
Piedmont Natural Gas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6
Piedmont Natural Gas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	5
Piedmont Natural Gas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 18

Revenue (Unbilled Revenues) (De

Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	$ 829	$ 843
Duke Energy Carolinas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	332	298
Progress Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	274	217
Duke Energy Progress
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	137	122
Duke Energy Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	137	95
Duke Energy Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	1	1
Duke Energy Ohio | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	68	82
Duke Energy Indiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	7	16
Duke Energy Indiana | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	106	115
Piedmont Natural Gas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	$ 6	$ 78

Stockholders' Equity (Earnings

Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities	$ (817)	$ 819	$ 82	$ 1,718
Accumulated preferred stock dividends	(12)
Net (loss) income available to Duke Energy common stockholders excluding impact of participating securities and including accumulated preferred stock dividends	$ (829)	$ 819	$ 82	$ 1,718
Weighted average common shares outstanding – basic (in shares)	735	728	734	728
Equity forwards (in shares)			1
Weighted average common shares outstanding – diluted (in shares)	735	728	735	728
Basic and diluted (in usd per share)	$ (1.13)	$ 1.12	$ 0.11	$ 2.36
Potentially dilutive items excluded from the calculation (in shares)	2	2	2	2
Common Stock
Class of Stock [Line Items]
Dividends declared per common share (in usd per share)	$ 0.945	$ 0.928	$ 1.890	$ 1.855
Preferred stock, Series A
Class of Stock [Line Items]
Dividends declared on preferred stock per depositary share (in usd per share)	0.359	$ 0.307	$ 0.719	$ 0.307
Cumulative dividend rate per annum			5.75%
Price per share (in usd per share)	25		$ 25
Preferred stock, Series B
Class of Stock [Line Items]
Dividends declared on preferred stock per depositary share (in usd per share)			$ 24.917
Cumulative dividend rate per annum			4.875%
Liquidation preference per share (in usd per share)	$ 1,000		$ 1,000

Stockholders' Equity (Common St

Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Billions	1 Months Ended
	May 31, 2020	Mar. 31, 2020	Nov. 30, 2019	Jun. 30, 2020
Forward Contract Indexed to Issuer's Equity [Line Items]
Maximum value of shares to be issued under ATM program			$ 1.5
Equity forwards
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares offered	903		28,750	940
Forward contract indexed to issuer's equity, forward rate per share	$ 82.44	$ 89.76	$ 85.99

Employee Benefit Plans (Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 42	$ 37	$ 83	$ 74
Interest cost on projected benefit obligation	68	82	135	165
Expected return on plan assets	(143)	(143)	(286)	(286)
Amortization of actuarial loss	30	25	64	49
Amortization of prior service credit	(8)	(8)	(16)	(16)
Amortization of settlement charges	3		5
Net periodic pension costs	(8)	(7)	(15)	(14)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	14	12	26	24
Interest cost on projected benefit obligation	15	21	31	41
Expected return on plan assets	(36)	(37)	(72)	(75)
Amortization of actuarial loss	7	5	14	11
Amortization of prior service credit	(2)	(2)	(4)	(4)
Amortization of settlement charges	1		2
Net periodic pension costs	(1)	(1)	(3)	(3)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	12	10	24	21
Interest cost on projected benefit obligation	22	26	43	52
Expected return on plan assets	(47)	(45)	(95)	(89)
Amortization of actuarial loss	9	9	20	18
Amortization of prior service credit	(1)		(2)	(1)
Amortization of settlement charges			1
Net periodic pension costs	(5)		(9)	1
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	8	6	14	12
Interest cost on projected benefit obligation	9	12	19	24
Expected return on plan assets	(22)	(21)	(44)	(44)
Amortization of actuarial loss	4	3	9	6
Amortization of prior service credit	(1)	(1)	(1)	(1)
Amortization of settlement charges	1		1
Net periodic pension costs	(1)	(1)	(2)	(3)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	6	11	10
Interest cost on projected benefit obligation	11	13	23	27
Expected return on plan assets	(26)	(22)	(51)	(44)
Amortization of actuarial loss	5	6	11	12
Amortization of prior service credit	(1)	(1)	(1)	(1)
Net periodic pension costs	(5)	2	(7)	4
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	2	2
Interest cost on projected benefit obligation	4	4	8	9
Expected return on plan assets	(7)	(6)	(14)	(14)
Amortization of actuarial loss	1		3	1
Net periodic pension costs	(1)	(1)	(1)	(2)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2	4	4
Interest cost on projected benefit obligation	5	7	11	13
Expected return on plan assets	(10)	(10)	(21)	(21)
Amortization of actuarial loss	3	1	6	3
Amortization of prior service credit	(1)	(1)	(1)	(1)
Net periodic pension costs	(1)	(1)	(1)	(2)
Piedmont Natural Gas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2	3	3
Interest cost on projected benefit obligation	3	3	5	6
Expected return on plan assets	(6)	(6)	(11)	(11)
Amortization of actuarial loss	3	1	5	3
Amortization of prior service credit	(3)	(2)	(5)	(5)
Net periodic pension costs	$ (1)	$ (2)	$ (3)	$ (4)

Income Taxes (Effective Tax Rat

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	26.20%	15.90%	98.90%	12.60%
Duke Energy Carolinas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	13.70%	19.70%	15.10%	18.70%
Progress Energy
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	14.90%	16.70%	16.10%	17.00%
Duke Energy Progress
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	13.90%	16.30%	15.70%	17.10%
Duke Energy Florida
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	19.10%	19.60%	19.40%	19.50%
Duke Energy Ohio
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	15.40%	16.10%	16.60%	16.50%
Duke Energy Indiana
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	17.30%	24.20%	19.30%	24.20%
Piedmont Natural Gas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	128.60%	22.20%	5.80%	21.80%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
AMT credit carryforwards
Tax Credit Carryforward [Line Items]
Tax refund	$ 572