Duke Energy (DUK) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 04, 2014
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Corporation	'
Entity Central Index Key	'0001326160	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	707,271,675
Duke Energy Carolinas [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Carolinas, LLC	'
Entity Central Index Key	'0000030371	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Progress Energy [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Progress Energy, Inc	'
Entity Central Index Key	'0001094093	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Duke Energy Progress [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Progress, Inc.	'
Entity Central Index Key	'0000017797	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Duke Energy Florida [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Florida, Inc.	'
Entity Central Index Key	'0000037637	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Duke Energy Ohio [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Ohio, Inc.	'
Entity Central Index Key	'0000020290	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Duke Energy Indiana [Member]	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'Duke Energy Indiana, Inc.	'
Entity Central Index Key	'0000081020	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended			6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Operating Revenues	'	'		'	'
Regulated electric	$5,167	$4,834		$10,745	$9,723
Nonregulated electric, natural gas and other	675	951		1,499	1,775
Regulated natural gas	107	94		329	279
Total operating revenues	5,949	5,879		12,573	11,777
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	1,808	1,678		3,808	3,381
Fuel used in electric generation and purchased power - nonregulated	436	447		845	901
Cost of natural gas and other	43	43		165	147
Operation, maintenance and other	1,467	1,504		2,973	2,925
Depreciation and amortization	761	678		1,551	1,338
Property and other taxes	318	323		676	666
Impairment charges	6	386		1,388	386
Total operating expenses	4,839	5,059		11,406	9,744
Gains on Sales of Other Assets and Other, net	6	1		7	3
Operating Income (Loss)	1,116	821		1,174	2,036
Other Income and Expenses	'	'		'	'
Equity in earnings of unconsolidated affiliates	33	22		69	58
Other income and expenses, net	89	48		184	128
Total other income and expenses	122	70		253	186
Interest Expense	413	381		819	748
Income (Loss) From Continuing Operations Before Income Taxes	825	510		608	1,474
Income Tax Expense (Benefit) from Continuing Operations	209	165		82	495
Income (Loss) From Continuing Operations	616	345		526	979
Loss From Discontinued Operations, net of tax	-3	-3		-6	-3
Net Income (Loss)	613	342		520	976
Less: Net Income Attributable to Noncontrolling Interests	4	3		8	3
Net Income (Loss) Attributable to Parent	609	339		512	973
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Pension and OPEB adjustments	1	2		'	5
Net unrealized gain (loss) on cash flow hedges	'	44	[1]	'	54	[1]
Reclassification into earnings from cash flow hedges	-9	'		-9	'
Other Comprehensive Income (Loss), net of tax	22	-91		45	-74
Comprehensive Income (Loss)	635	251		565	902
Comprehensive Income Attributable to Parent	631	252		556	903
Income from continuing operations attributable to Duke Energy Corporation common shareholders	'	'		'	'
Basic (usd per share)	$0.86	$0.48		$0.73	$1.37
Diluted (usd per share)	$0.86	$0.48		$0.73	$1.37
Income from discontinued operations attributable to Duke Energy Corporation common shareholders	'	'		'	'
Basic (usd per share)	'	'		($0.01)	'
Diluted (usd per share)	'	'		($0.01)	'
Net Income attributable to Duke Energy Corporation common shareholders	'	'		'	'
Basic (usd per share)	$0.86	$0.48		$0.72	$1.37
Diluted (usd per share)	$0.86	$0.48		$0.72	$1.37
Weighted-average shares outstanding	'	'		'	'
Basic (shares)	707	706		707	705
Diluted (shares)	707	706		707	706
Duke Energy Carolinas [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Total operating revenues	1,755	1,591		3,755	3,320
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	503	443		1,161	961
Operation, maintenance and other	463	479		950	936
Depreciation and amortization	248	226		490	448
Property and other taxes	100	92		204	192
Impairment charges	3	'		3	'
Total operating expenses	1,317	1,240		2,808	2,537
Gains on Sales of Other Assets and Other, net	'	'		'	2
Operating Income (Loss)	438	351		947	785
Other Income and Expenses	'	'		'	'
Other income and expenses, net	44	29		93	65
Interest Expense	102	91		203	173
Income (Loss) From Continuing Operations Before Income Taxes	380	289		837	677
Income Tax Expense (Benefit) from Continuing Operations	110	108		281	252
Net Income (Loss) Attributable to Parent	270	181		556	425
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Reclassification into earnings from cash flow hedges	1	'		2	'
Other Comprehensive Income (Loss), net of tax	'	'		2	'
Comprehensive Income Attributable to Parent	271	181		558	425
Progress Energy [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Total operating revenues	2,421	2,281		4,962	4,467
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	977	918		2,020	1,778
Operation, maintenance and other	555	533		1,150	1,094
Depreciation and amortization	281	210		557	404
Property and other taxes	137	141		288	282
Impairment charges	-17	366		-17	366
Total operating expenses	1,933	2,168		3,998	3,924
Gains on Sales of Other Assets and Other, net	0	1		1	1
Operating Income (Loss)	488	114		965	544
Other Income and Expenses	'	'		'	'
Other income and expenses, net	13	14		28	37
Interest Expense	167	160		336	358
Income (Loss) From Continuing Operations Before Income Taxes	334	-32		657	223
Income Tax Expense (Benefit) from Continuing Operations	127	-19		246	82
Income (Loss) From Continuing Operations	207	-13		411	141
Loss From Discontinued Operations, net of tax	-5	-4		-6	-4
Net Income (Loss)	202	-17		405	137
Less: Net Income Attributable to Noncontrolling Interests	0	0		1	1
Net Income (Loss) Attributable to Parent	202	-17		404	136
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Pension and OPEB adjustments	0	0		1	1
Net unrealized gain (loss) on cash flow hedges	0	2		0	3
Reclassification into earnings from cash flow hedges	4	0		4	0
Other Comprehensive Income (Loss), net of tax	4	2		5	4
Comprehensive Income (Loss)	206	-15		410	141
Duke Energy Progress [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Total operating revenues	1,191	1,135		2,613	2,351
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	454	441		1,027	896
Operation, maintenance and other	347	340		728	692
Depreciation and amortization	142	113		286	250
Property and other taxes	54	53		121	113
Impairment charges	-18	22		-18	22
Total operating expenses	979	969		2,144	1,973
Gains on Sales of Other Assets and Other, net	'	'		1	'
Operating Income (Loss)	212	166		470	378
Other Income and Expenses	'	'		'	'
Other income and expenses, net	7	8		16	22
Interest Expense	58	47		115	95
Income (Loss) From Continuing Operations Before Income Taxes	161	127		371	305
Income Tax Expense (Benefit) from Continuing Operations	60	50		137	118
Net Income (Loss) Attributable to Parent	101	77		234	187
Duke Energy Florida [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Total operating revenues	1,225	1,142		2,341	2,110
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	523	478		993	883
Operation, maintenance and other	204	198		414	409
Depreciation and amortization	139	90		271	142
Property and other taxes	83	85		167	164
Impairment charges	'	345		1	345
Total operating expenses	949	1,196		1,846	1,943
Gains on Sales of Other Assets and Other, net	'	1		'	1
Operating Income (Loss)	276	-53		495	168
Other Income and Expenses	'	'		'	'
Other income and expenses, net	6	5		11	13
Interest Expense	50	43		99	92
Income (Loss) From Continuing Operations Before Income Taxes	232	-91		407	89
Income Tax Expense (Benefit) from Continuing Operations	90	-34		157	36
Net Income (Loss) Attributable to Parent	142	-57		250	53
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Reclassification into earnings from cash flow hedges	'	'		1	'
Other Comprehensive Income (Loss), net of tax	'	'		1	'
Comprehensive Income Attributable to Parent	142	-57		251	53
Duke Energy Ohio [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Regulated electric	336	339		703	672
Nonregulated electric, natural gas and other	88	378		261	606
Regulated natural gas	107	94		330	280
Total operating revenues	531	811		1,294	1,558
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	107	103		231	206
Fuel used in electric generation and purchased power - nonregulated	226	222		357	462
Cost of natural gas and other	25	17		127	93
Operation, maintenance and other	186	212		367	397
Depreciation and amortization	56	89		147	177
Property and other taxes	52	64		127	136
Impairment charges	21	'		1,438	'
Total operating expenses	673	707		2,794	1,471
Gains on Sales of Other Assets and Other, net	'	4		'	4
Operating Income (Loss)	-142	108		-1,500	91
Other Income and Expenses	'	'		'	'
Other income and expenses, net	2	1		5	3
Interest Expense	29	18		51	36
Income (Loss) From Continuing Operations Before Income Taxes	-169	91		-1,546	58
Income Tax Expense (Benefit) from Continuing Operations	-62	33		-549	21
Net Income (Loss) Attributable to Parent	-107	58		-997	37
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Pension and OPEB adjustments	'	'		'	1
Other Comprehensive Income (Loss), net of tax	'	'		'	1
Comprehensive Income Attributable to Parent	-107	58		-997	38
Duke Energy Indiana [Member]	'	'		'	'
Operating Revenues	'	'		'	'
Total operating revenues	748	700		1,593	1,424
Operating Expenses	'	'		'	'
Fuel used in electric generation and purchased power - regulated	287	276		626	569
Operation, maintenance and other	159	163		325	313
Depreciation and amortization	103	77		205	155
Property and other taxes	21	16		44	38
Total operating expenses	570	532		1,200	1,075
Operating Income (Loss)	178	168		393	349
Other Income and Expenses	'	'		'	'
Other income and expenses, net	4	6		11	10
Interest Expense	44	43		87	84
Income (Loss) From Continuing Operations Before Income Taxes	138	131		317	275
Income Tax Expense (Benefit) from Continuing Operations	51	49		117	103
Net Income (Loss) Attributable to Parent	87	82		200	172
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Pension and OPEB adjustments	'	-1		'	-1
Other Comprehensive Income (Loss), net of tax	'	'		'	-1
Comprehensive Income Attributable to Parent	$87	$81		$200	$171
[1]	Net of $14 million tax expense and $18 million tax expense for the three months and six months ended June 30, 2013.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'	'		'	'
Net income (loss)	$613	$342		$520	$976
Other Comprehensive Income (Loss), net of tax	'	'		'	'
Foreign currency translation adjustments	28	-133		52	-129
Pension and OPEB adjustments	1	2		'	5
Net unrealized gain (loss) on cash flow hedges	'	44	[1]	'	54	[1]
Reclassification into earnings and other adjustments to cash flow hedges	-9	'		-9	'
Unrealized gain (loss) on investments in available-for-sale securities	2	-4		2	-4
Other Comprehensive Income (Loss), net of tax	22	-91		45	-74
Comprehensive Income (Loss)	635	251		565	902
Less: Comprehensive Income (Loss) Attributable to Noncontrolling Interests	4	-1		9	-1
Comprehensive Income Attributable to Parent	$631	$252		$556	$903
[1]	Net of $14 million tax expense and $18 million tax expense for the three months and six months ended June 30, 2013.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net unrealized gains (losses) on cash flow hedges, tax	$14	$18

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$2,008	$1,501
Short-term investments	'	44
Receivables (net of allowance for doubtful accounts)	877	1,286
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	2,118	1,719
Inventory	3,056	3,250
Assets held for sale	409	'
Regulatory assets	1,349	895
Other	1,698	1,821
Total current assets	11,515	10,516
Investments and Other Assets	'	'
Investments in equity method unconsolidated affiliates	381	390
Nuclear decommissioning trust funds	5,417	5,132
Goodwill	16,343	16,340
Assets held for sale	2,195	107
Other	3,227	3,432
Total investments and other assets	27,563	25,401
Property, Plant and Equipment	'	'
Cost	100,885	103,115
Accumulated depreciation and amortization	-33,977	-33,625
Net property, plant and equipment	66,908	69,490
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	9,009	9,191
Other	178	181
Total regulatory assets and deferred debits	9,187	9,372
Total Assets	115,173	114,779
Current Liabilities	'	'
Accounts payable	1,782	2,391
Notes payable and commercial paper	1,867	839
Taxes accrued	522	551
Interest accrued	453	440
Current maturities of long-term debt	1,887	2,104
Liabilities associated with assets held for sale	271	7
Regulatory liabilities	140	316
Other	1,786	1,996
Total current liabilities	8,708	8,644
Long-term Debt	38,706	38,152
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	12,014	12,097
Investment tax credits	435	442
Accrued pension and other post-retirement benefit costs	1,263	1,322
Liabilities associated with assets held for sale	75	66
Asset retirement obligations	5,030	4,950
Regulatory liabilities	6,338	5,949
Other	1,723	1,749
Total deferred credits and other liabilities	26,878	26,575
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1	1
Additional paid-in capital	39,389	39,365
Retained earnings	1,768	2,363
Accumulated other comprehensive loss	-355	-399
Total Duke Energy Corporation stockholders' equity	40,803	41,330
Noncontrolling interests	78	78
Total equity	40,881	41,408
Total Liabilities and Equity	115,173	114,779
Duke Energy Carolinas [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	23	23
Receivables (net of allowance for doubtful accounts)	163	186
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	705	673
Receivables from affiliated companies	87	75
Notes receivable from affiliated companies	280	222
Inventory	909	1,065
Regulatory assets	388	295
Other	271	309
Total current assets	2,826	2,848
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	2,995	2,840
Other	997	1,000
Total investments and other assets	3,992	3,840
Property, Plant and Equipment	'	'
Cost	35,645	34,906
Accumulated depreciation and amortization	-12,304	-11,894
Net property, plant and equipment	23,341	23,012
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	1,509	1,527
Other	43	46
Total regulatory assets and deferred debits	1,552	1,573
Total Assets	31,711	31,273
Current Liabilities	'	'
Accounts payable	510	701
Accounts payable to affiliated companies	156	161
Taxes accrued	255	147
Interest accrued	100	97
Current maturities of long-term debt	47	47
Regulatory liabilities	30	65
Other	368	393
Total current liabilities	1,466	1,611
Long-term Debt	8,088	8,089
Long-term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	5,781	5,706
Investment tax credits	207	210
Accrued pension and other post-retirement benefit costs	157	161
Asset retirement obligations	1,641	1,594
Regulatory liabilities	2,736	2,576
Other	678	676
Total deferred credits and other liabilities	11,200	10,923
Commitments and Contingencies	'	'
Equity	'	'
Member's equity	10,670	10,365
Accumulated other comprehensive loss	-13	-15
Total member's equity	10,657	10,350
Total Liabilities and Equity	31,711	31,273
Progress Energy [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	38	58
Receivables (net of allowance for doubtful accounts)	193	528
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	875	417
Receivables from affiliated companies	19	4
Notes receivable from affiliated companies	65	75
Inventory	1,481	1,424
Regulatory assets	642	353
Other	449	726
Total current assets	3,762	3,585
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	2,422	2,292
Goodwill	3,655	3,655
Other	773	804
Total investments and other assets	6,850	6,751
Property, Plant and Equipment	'	'
Cost	36,750	36,480
Accumulated depreciation and amortization	-13,214	-13,098
Net property, plant and equipment	23,536	23,382
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	4,036	4,155
Other	96	96
Total regulatory assets and deferred debits	4,132	4,251
Total Assets	38,280	37,969
Current Liabilities	'	'
Accounts payable	660	836
Accounts payable to affiliated companies	234	123
Notes payable to affiliated companies	984	1,213
Taxes accrued	148	105
Interest accrued	176	181
Current maturities of long-term debt	318	485
Regulatory liabilities	87	207
Other	749	896
Total current liabilities	3,356	4,046
Long-term Debt	14,200	13,630
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	3,801	3,283
Accrued pension and other post-retirement benefit costs	631	765
Asset retirement obligations	2,597	2,562
Regulatory liabilities	2,480	2,292
Other	482	527
Total deferred credits and other liabilities	9,991	9,429
Commitments and Contingencies	'	'
Equity	'	'
Common stock	0	0
Additional paid-in capital	7,467	7,467
Retained earnings	3,317	3,452
Accumulated other comprehensive loss	-54	-59
Total Duke Energy Corporation stockholders' equity	10,730	10,860
Noncontrolling interests	3	4
Total equity	10,733	10,864
Total Liabilities and Equity	38,280	37,969
Duke Energy Progress [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	7	21
Receivables (net of allowance for doubtful accounts)	120	145
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	471	417
Receivables from affiliated companies	6	2
Inventory	897	853
Regulatory assets	369	127
Other	271	296
Total current assets	2,141	1,861
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	1,632	1,539
Other	461	443
Total investments and other assets	2,093	1,982
Property, Plant and Equipment	'	'
Cost	22,638	22,273
Accumulated depreciation and amortization	-8,828	-8,623
Net property, plant and equipment	13,810	13,650
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	1,428	1,384
Other	34	32
Total regulatory assets and deferred debits	1,462	1,416
Total Assets	19,506	18,909
Current Liabilities	'	'
Accounts payable	316	420
Accounts payable to affiliated companies	162	103
Notes payable to affiliated companies	201	462
Taxes accrued	48	37
Interest accrued	78	70
Current maturities of long-term debt	306	174
Regulatory liabilities	61	63
Other	329	392
Total current liabilities	1,501	1,721
Long-term Debt	5,411	5,061
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	2,715	2,557
Accrued pension and other post-retirement benefit costs	315	321
Asset retirement obligations	1,779	1,729
Regulatory liabilities	1,853	1,673
Other	198	222
Total deferred credits and other liabilities	6,860	6,502
Commitments and Contingencies	'	'
Equity	'	'
Common stock	2,159	2,159
Retained earnings	3,575	3,466
Total equity	5,734	5,625
Total Liabilities and Equity	19,506	18,909
Duke Energy Florida [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	13	16
Receivables (net of allowance for doubtful accounts)	71	375
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	403	'
Receivables from affiliated companies	7	3
Notes receivable from affiliated companies	76	'
Inventory	583	571
Regulatory assets	273	221
Other	23	182
Total current assets	1,449	1,368
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	790	753
Other	256	252
Total investments and other assets	1,046	1,005
Property, Plant and Equipment	'	'
Cost	14,102	13,863
Accumulated depreciation and amortization	-4,380	-4,252
Net property, plant and equipment	9,722	9,611
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	2,609	2,729
Other	43	44
Total regulatory assets and deferred debits	2,652	2,773
Total Assets	14,869	14,757
Current Liabilities	'	'
Accounts payable	345	333
Accounts payable to affiliated companies	67	38
Notes payable to affiliated companies	'	181
Taxes accrued	173	66
Interest accrued	42	46
Current maturities of long-term debt	12	11
Regulatory liabilities	26	144
Other	405	445
Total current liabilities	1,070	1,264
Long-term Debt	5,095	4,875
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	1,800	1,829
Accrued pension and other post-retirement benefit costs	283	286
Asset retirement obligations	818	833
Regulatory liabilities	625	618
Other	254	255
Total deferred credits and other liabilities	3,780	3,821
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1,762	1,762
Retained earnings	3,162	3,036
Accumulated other comprehensive loss	'	-1
Total equity	4,924	4,797
Total Liabilities and Equity	14,869	14,757
Duke Energy Ohio [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	25	36
Receivables (net of allowance for doubtful accounts)	119	121
Receivables from affiliated companies	73	121
Notes receivable from affiliated companies	184	57
Inventory	120	229
Assets held for sale	359	'
Regulatory assets	71	57
Other	188	270
Total current assets	1,139	891
Investments and Other Assets	'	'
Goodwill	920	920
Assets held for sale	2,153	'
Other	19	232
Total investments and other assets	3,092	1,152
Property, Plant and Equipment	'	'
Cost	7,091	11,143
Accumulated depreciation and amortization	-2,223	-2,908
Net property, plant and equipment	4,868	8,235
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	461	471
Other	9	14
Total regulatory assets and deferred debits	470	485
Total Assets	9,569	10,763
Current Liabilities	'	'
Accounts payable	166	319
Accounts payable to affiliated companies	74	77
Notes payable to affiliated companies	828	43
Taxes accrued	97	167
Interest accrued	20	17
Current maturities of long-term debt	197	47
Liabilities associated with assets held for sale	257	'
Regulatory liabilities	13	27
Other	78	110
Total current liabilities	1,730	807
Long-term Debt	1,587	2,141
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	1,527	2,012
Accrued pension and other post-retirement benefit costs	31	58
Liabilities associated with assets held for sale	74	'
Asset retirement obligations	25	28
Regulatory liabilities	261	262
Other	162	186
Total deferred credits and other liabilities	2,080	2,546
Commitments and Contingencies	'	'
Equity	'	'
Common stock	762	762
Additional paid-in capital	4,782	4,882
Retained earnings	-1,372	-375
Total equity	4,172	5,269
Total Liabilities and Equity	9,569	10,763
Duke Energy Indiana [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	12	15
Receivables (net of allowance for doubtful accounts)	42	22
Receivables from affiliated companies	108	151
Notes receivable from affiliated companies	75	96
Inventory	440	434
Regulatory assets	173	118
Other	231	125
Total current assets	1,081	961
Investments and Other Assets	'	'
Other	218	269
Total investments and other assets	218	269
Property, Plant and Equipment	'	'
Cost	12,717	12,489
Accumulated depreciation and amortization	-4,049	-3,913
Net property, plant and equipment	8,668	8,576
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	669	717
Other	25	25
Total regulatory assets and deferred debits	694	742
Total Assets	10,661	10,548
Current Liabilities	'	'
Accounts payable	129	206
Accounts payable to affiliated companies	69	56
Taxes accrued	138	57
Interest accrued	59	56
Current maturities of long-term debt	5	5
Regulatory liabilities	10	16
Other	125	88
Total current liabilities	535	484
Long-term Debt	3,640	3,641
Long-term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	1,303	1,171
Investment tax credits	140	140
Accrued pension and other post-retirement benefit costs	106	163
Asset retirement obligations	30	30
Regulatory liabilities	804	782
Other	39	48
Total deferred credits and other liabilities	2,422	2,334
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1	1
Additional paid-in capital	1,384	1,384
Retained earnings	2,526	2,551
Accumulated other comprehensive loss	3	3
Total equity	3,914	3,939
Total Liabilities and Equity	$10,661	$10,548

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Receivables, allowance for doubtful accounts	$18	$30
Restricted receivables, allowance for doubtful accounts	54	43
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	707,000,000	706,000,000
Duke Energy Carolinas [Member]	'	'
Receivables, allowance for doubtful accounts	3	3
Restricted receivables, allowance for doubtful accounts	6	6
Progress Energy [Member]	'	'
Receivables, allowance for doubtful accounts	7	14
Restricted receivables, allowance for doubtful accounts	7	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Duke Energy Progress [Member]	'	'
Receivables, allowance for doubtful accounts	6	10
Restricted receivables, allowance for doubtful accounts	5	'
Common stock, par value	$0	$0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares outstanding	160,000,000	160,000,000
Duke Energy Florida [Member]	'	'
Receivables, allowance for doubtful accounts	2	4
Restricted receivables, allowance for doubtful accounts	3	'
Common stock, par value	$0	$0
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	100	100
Duke Energy Ohio [Member]	'	'
Receivables, allowance for doubtful accounts	2	2
Common stock, par value	$8.50	$8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	89,663,086	89,663,086
Duke Energy Indiana [Member]	'	'
Receivables, allowance for doubtful accounts	$1	$1
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	53,913,701	53,913,701

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	$512	$973
Net income (loss)	520	976
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,748	1,544
Equity component of AFUDC	-61	-82
Gains (losses) on sales of other assets	-2	8
Impairment charges	1,388	386
Deferred income taxes	-46	397
Equity in earnings of unconsolidated affiliates	-69	-58
Accrued pension and other post-retirement benefit costs	54	172
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	116	40
Receivables	-118	-144
Inventory	122	84
Other current assets	-451	-43
Increase (decrease) in	'	'
Accounts payable	-218	-308
Taxes accrued	-84	95
Other current liabilities	-308	4
Other assets	-45	-175
Other liabilities	73	-53
Net cash provided by operating activities	2,619	2,843
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-2,400	-2,715
Investment expenditures	-38	-49
Acquisitions	-16	0
Purchases of available-for-sale securities	-1,773	-2,827
Proceeds from sales and maturities of available-for-sale securities	1,793	2,775
Net proceeds from the sales of other assets	119	38
Change in restricted cash	-6	188
Other	-46	28
Net cash used in investing activities	-2,367	-2,562
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	2,088	1,832
Proceeds from the issuance of common stock related to employee benefit plans	23	7
Payments for the redemption of long-term debt	-1,757	-1,538
Payments for the redemption of preferred stock	0	-96
Notes payable and commercial paper	1,024	763
Distributions to noncontrolling interests	-9	-8
Dividends paid	-1,107	-1,085
Other	-7	-9
Net cash provided by (used in) financing activities	255	-134
Net increase in cash and cash equivalents	507	147
Cash and cash equivalents at beginning of period	1,501	1,424
Cash and cash equivalents at end of period	2,008	1,571
Significant non-cash transactions:	'	'
Accrued capital expenditures	348	480
Dividends declared but not paid	0	551
Duke Energy Carolinas [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	556	425
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	621	569
Equity component of AFUDC	-44	-47
Gains (losses) on sales of other assets	'	-2
Impairment charges	3	0
Deferred income taxes	132	247
Accrued pension and other post-retirement benefit costs	11	20
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	3	-7
Receivables	-39	-3
Receivables from affiliated companies	-12	-46
Inventory	157	-12
Other current assets	-150	-14
Increase (decrease) in	'	'
Accounts payable	-107	-44
Accounts payable to affiliated companies	-5	-6
Taxes accrued	95	-5
Other current liabilities	-57	-50
Other assets	6	-68
Other liabilities	15	-41
Net cash provided by operating activities	1,185	916
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-851	-804
Purchases of available-for-sale securities	-1,098	-1,122
Proceeds from sales and maturities of available-for-sale securities	1,087	1,098
Notes receivable from affiliated companies	-58	167
Other	-14	-10
Net cash used in investing activities	-934	-671
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Dividends or distributions to parent	-251	-249
Other	0	-2
Net cash provided by (used in) financing activities	-251	-251
Net increase in cash and cash equivalents	0	-6
Cash and cash equivalents at beginning of period	23	19
Cash and cash equivalents at end of period	23	13
Significant non-cash transactions:	'	'
Accrued capital expenditures	113	125
Progress Energy [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	404	136
Net income (loss)	405	137
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	642	480
Equity component of AFUDC	-9	-27
Gains (losses) on sales of other assets	3	4
Impairment charges	-17	366
Deferred income taxes	261	71
Accrued pension and other post-retirement benefit costs	14	105
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	14	23
Receivables	-166	-148
Receivables from affiliated companies	-15	12
Inventory	-18	69
Other current assets	-199	-33
Increase (decrease) in	'	'
Accounts payable	-41	-203
Accounts payable to affiliated companies	111	48
Taxes accrued	49	124
Other current liabilities	-157	169
Other assets	-71	-126
Other liabilities	-27	88
Net cash provided by operating activities	779	1,159
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-888	-1,295
Purchases of available-for-sale securities	-453	-978
Proceeds from sales and maturities of available-for-sale securities	442	960
Notes receivable from affiliated companies	10	-101
Other	-41	21
Net cash used in investing activities	-930	-1,393
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	875	545
Payments for the redemption of long-term debt	-473	-788
Payments for the redemption of preferred stock	0	-96
Notes payable to affiliated companies	-229	403
Distributions to noncontrolling interests	-2	-2
Other	-40	-5
Net cash provided by (used in) financing activities	131	57
Net increase in cash and cash equivalents	-20	-177
Cash and cash equivalents at beginning of period	58	231
Cash and cash equivalents at end of period	38	54
Significant non-cash transactions:	'	'
Accrued capital expenditures	156	310
Duke Energy Progress [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	234	187
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	368	324
Equity component of AFUDC	-9	-23
Gains (losses) on sales of other assets	-1	0
Impairment charges	-18	22
Deferred income taxes	156	146
Accrued pension and other post-retirement benefit costs	-4	48
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	7	-12
Receivables	-8	-49
Receivables from affiliated companies	-4	-3
Inventory	-22	23
Other current assets	-151	-69
Increase (decrease) in	'	'
Accounts payable	-61	-142
Accounts payable to affiliated companies	59	27
Taxes accrued	11	41
Other current liabilities	-52	-49
Other assets	-13	-53
Other liabilities	-7	5
Net cash provided by operating activities	485	423
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-540	-725
Purchases of available-for-sale securities	-269	-318
Proceeds from sales and maturities of available-for-sale securities	253	299
Other	-34	3
Net cash used in investing activities	-590	-741
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	650	545
Payments for the redemption of long-term debt	-168	-50
Payments for the redemption of preferred stock	'	-62
Notes payable to affiliated companies	-261	-107
Dividends or distributions to parent	-125	0
Other	-5	-6
Net cash provided by (used in) financing activities	91	320
Net increase in cash and cash equivalents	-14	2
Cash and cash equivalents at beginning of period	21	18
Cash and cash equivalents at end of period	7	20
Significant non-cash transactions:	'	'
Accrued capital expenditures	113	216
Duke Energy Florida [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	250	53
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	273	145
Equity component of AFUDC	'	-4
Gains (losses) on sales of other assets	'	-1
Impairment charges	1	345
Deferred income taxes	84	34
Accrued pension and other post-retirement benefit costs	15	43
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	3	33
Receivables	-82	-85
Receivables from affiliated companies	-4	20
Inventory	4	44
Other current assets	-49	-44
Increase (decrease) in	'	'
Accounts payable	58	26
Accounts payable to affiliated companies	29	-3
Taxes accrued	108	127
Other current liabilities	-94	232
Other assets	-58	-76
Other liabilities	-29	23
Net cash provided by operating activities	509	912
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-348	-564
Purchases of available-for-sale securities	-183	-661
Proceeds from sales and maturities of available-for-sale securities	188	661
Notes receivable from affiliated companies	-76	207
Other	-8	9
Net cash used in investing activities	-427	-348
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	225	'
Payments for the redemption of long-term debt	-4	-429
Payments for the redemption of preferred stock	'	-34
Notes payable to affiliated companies	-181	11
Dividends or distributions to parent	-124	-225
Other	-1	'
Net cash provided by (used in) financing activities	-85	-677
Net increase in cash and cash equivalents	-3	-113
Cash and cash equivalents at beginning of period	16	131
Cash and cash equivalents at end of period	13	18
Significant non-cash transactions:	'	'
Accrued capital expenditures	44	93
Duke Energy Ohio [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	-997	37
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	154	179
Equity component of AFUDC	-2	'
Gains (losses) on sales of other assets	'	-4
Impairment charges	1,438	'
Deferred income taxes	-513	15
Accrued pension and other post-retirement benefit costs	4	9
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	139	22
Receivables	-98	-19
Receivables from affiliated companies	48	-8
Inventory	-4	21
Other current assets	-30	-19
Increase (decrease) in	'	'
Accounts payable	-6	-36
Accounts payable to affiliated companies	-3	-4
Taxes accrued	-74	-49
Other current liabilities	-9	-2
Other assets	-36	-9
Other liabilities	-8	-23
Net cash provided by operating activities	3	110
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-167	-222
Net proceeds from the sales of other assets	'	11
Notes receivable from affiliated companies	-127	-18
Net cash used in investing activities	-294	-229
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Payments for the redemption of long-term debt	-405	-253
Notes payable to affiliated companies	785	357
Dividends or distributions to parent	-100	'
Other	'	-1
Net cash provided by (used in) financing activities	280	103
Net increase in cash and cash equivalents	-11	-16
Cash and cash equivalents at beginning of period	36	31
Cash and cash equivalents at end of period	25	15
Significant non-cash transactions:	'	'
Accrued capital expenditures	19	18
Duke Energy Indiana [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	200	172
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	206	158
Equity component of AFUDC	-6	-7
Deferred income taxes	45	92
Accrued pension and other post-retirement benefit costs	7	12
(Increase) decrease in	'	'
Receivables	-19	-2
Receivables from affiliated companies	43	-6
Inventory	-6	-17
Other current assets	-16	-1
Increase (decrease) in	'	'
Accounts payable	-47	-7
Accounts payable to affiliated companies	13	-13
Taxes accrued	51	-8
Other current liabilities	-4	-10
Other assets	-8	11
Other liabilities	35	-18
Net cash provided by operating activities	494	356
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-291	-281
Purchases of available-for-sale securities	-9	-5
Proceeds from sales and maturities of available-for-sale securities	6	5
Notes receivable from affiliated companies	21	-21
Other	3	1
Net cash used in investing activities	-270	-301
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Payments for the redemption of long-term debt	-1	-1
Notes payable to affiliated companies	'	-81
Dividends or distributions to parent	-225	'
Other	-1	-1
Net cash provided by (used in) financing activities	-227	-83
Net increase in cash and cash equivalents	-3	-28
Cash and cash equivalents at beginning of period	15	36
Cash and cash equivalents at end of period	12	8
Significant non-cash transactions:	'	'
Accrued capital expenditures	$43	$32

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Changes in Equity (USD $)

Total

Common Stock [Member]

Additional Paid In Capital [Member]

Retained Earnings [Member]

Foreign Currency Adjustments [Member]

Net Gains (Losses) on Cash Flow Hedges [Member]

Net Gains (Losses) on Available for Sale Securities [Member]

Pension and OPEB Related Adjustments [Member]

Common Stockholders' Equity [Member]

Noncontrolling Interest [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

In Millions, except Share data, unless otherwise specified

Members Equity [Member]

Net Gains (Losses) on Cash Flow Hedges [Member]

Net Gains (Losses) on Available for Sale Securities [Member]

Common Stock [Member]

Additional Paid In Capital [Member]

Retained Earnings [Member]

Net Gains (Losses) on Cash Flow Hedges [Member]

Pension and OPEB Related Adjustments [Member]

Common Stockholders' Equity [Member]

Noncontrolling Interest [Member]

Common Stock [Member]

Retained Earnings [Member]

Common Stock [Member]

Retained Earnings [Member]

Net Gains (Losses) on Cash Flow Hedges [Member]

Common Stock [Member]

Additional Paid In Capital [Member]

Retained Earnings [Member]

Pension and OPEB Related Adjustments [Member]

Common Stock [Member]

Additional Paid In Capital [Member]

Retained Earnings [Member]

Net Gains (Losses) on Cash Flow Hedges [Member]

Beginning member's equity at Dec. 31, 2012

'

'

'

'

'

'

'

'

'

'

$9,872

$9,888

($15)

($1)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2012

40,941

1

39,279

1,889

-116

-100

'

-90

40,863

78

'

'

'

'

10,185

0

7,465

2,783

-42

-25

10,181

4

5,127

2,159

2,968

4,799

1,762

3,037

0

5,166

762

4,882

-477

-1

3,708

1

1,384

2,318

5

Balance, in shares at Dec. 31, 2012

'

704,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

976

'

'

973

'

'

'

'

973

3

'

'

'

'

137

'

'

136

'

'

136

1

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

973

'

'

'

'

'

'

'

'

'

425

425

'

'

136

'

'

'

'

'

'

'

187

'

187

53

'

53

'

37

'

'

37

'

172

'

'

172

'

Other comprehensive income (loss), net of tax

-74

'

'

'

-125

54

-4

5

-70

-4

'

'

'

'

4

'

'

'

3

1

4

'

'

'

'

'

'

'

'

1

'

'

'

1

-1

'

'

'

-1

Common stock issuances, including dividend reinvestment and employee benefits

5

'

5

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issuances, including dividend reinvestment and employee benefits, shares

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-1,636

'

'

-1,636

'

'

'

'

-1,636

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-225

'

-225

'

'

'

'

'

'

'

'

'

'

'

Distributions to parent

'

'

'

'

'

'

'

'

'

'

-249

-249

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premium on the redemption of preferred stock of subsidiaries

-3

'

'

-3

'

'

'

'

-3

'

'

'

'

'

-3

'

'

-3

'

'

-3

'

-2

0

-2

-1

'

-1

'

'

'

'

'

'

'

'

'

'

'

Changes in noncontrolling interest in subsidiaries

-8

'

'

'

'

'

'

'

'

-8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution to noncontrolling interest in subsidiaries

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2

'

'

'

'

'

'

-2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Jun. 30, 2013

'

'

'

'

'

'

'

'

'

'

10,048

10,064

-15

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2013

40,201

1

39,284

1,223

-241

-46

-4

-85

40,132

69

'

'

'

'

10,321

0

7,465

2,916

-39

-24

10,318

3

5,312

2,159

3,153

4,626

1,762

2,864

0

5,204

762

4,882

-440

0

3,879

1

1,384

2,490

4

Balance, in shares at Jun. 30, 2013

'

706,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning member's equity at Mar. 31, 2013

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

342

'

'

'

'

'

'

'

'

'

'

'

'

'

-17

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

339

'

'

'

'

'

'

'

'

'

181

'

'

'

-17

'

'

'

'

'

'

'

77

'

'

-57

'

'

'

58

'

'

'

'

82

'

'

'

'

Other comprehensive income (loss), net of tax

-91

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Jun. 30, 2013

'

'

'

'

'

'

'

'

'

'

10,048

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2013

40,201

'

'

'

'

'

'

'

'

'

'

'

'

'

10,321

0

7,465

'

'

'

'

'

5,312

'

'

4,626

1,762

'

0

5,204

762

4,882

'

'

3,879

'

'

'

'

Beginning member's equity at Dec. 31, 2013

'

'

'

'

'

'

'

'

'

'

10,350

10,365

-14

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Dec. 31, 2013

41,408

1

39,365

2,363

-307

-40

'

-52

41,330

78

'

'

'

'

10,864

0

7,467

3,452

-43

-16

10,860

4

5,625

2,159

3,466

4,797

1,762

3,036

-1

5,269

762

4,882

-375

0

3,939

1

1,384

2,551

3

Balance, in shares at Dec. 31, 2013

706,000,000

706,000,000

'

'

'

'

'

'

'

'

'

'

'

'

100

'

'

'

'

'

'

'

160,000,000

'

'

100

'

'

'

89,663,086

'

'

'

'

53,913,701

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

520

'

'

512

'

'

'

'

512

8

'

'

'

'

405

'

'

404

'

'

404

1

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

512

'

'

'

'

'

'

'

'

'

556

556

'

'

404

'

'

'

'

'

'

'

234

'

234

250

'

250

'

-997

'

'

-997

'

200

'

'

200

'

Other comprehensive income (loss), net of tax

45

'

'

'

51

-9

2

'

44

1

2

'

2

'

5

'

'

'

4

1

5

'

'

'

'

1

'

'

1

'

'

'

'

'

'

'

'

'

'

Common stock issuances, including dividend reinvestment and employee benefits

24

'

24

'

'

'

'

'

24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issuances, including dividend reinvestment and employee benefits, shares

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-1,107

'

'

-1,107

'

'

'

'

-1,107

'

'

'

'

'

'

'

'

'

'

'

'

'

-125

'

-125

-124

'

-124

'

-100

'

-100

'

'

-225

'

'

-225

'

Distributions to parent

'

'

'

'

'

'

'

'

'

'

-251

-251

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution to noncontrolling interest in subsidiaries

-9

'

'

'

'

'

'

'

'

-9

'

'

'

'

-2

'

'

'

'

'

'

-2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer of service company net assets to Duke Energy

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-539

'

'

-539

'

'

-539

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Jun. 30, 2014

'

'

'

'

'

'

'

'

'

'

10,657

10,670

-12

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2014

40,881

1

39,389

1,768

-256

-49

2

-52

40,803

78

'

'

'

'

10,733

0

7,467

3,317

-39

-15

10,730

3

5,734

2,159

3,575

4,924

1,762

3,162

0

4,172

762

4,782

-1,372

0

3,914

1

1,384

2,526

3

Balance, in shares at Jun. 30, 2014

707,000,000

707,000,000

'

'

'

'

'

'

'

'

'

'

'

'

100

'

'

'

'

'

'

'

160,000,000

'

'

100

'

'

'

89,663,086

'

'

'

'

53,913,701

'

'

'

'

Beginning member's equity at Mar. 31, 2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

613

'

'

'

'

'

'

'

'

'

'

'

'

'

202

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

609

'

'

'

'

'

'

'

'

'

270

'

'

'

202

'

'

'

'

'

'

'

101

'

'

142

'

'

'

-107

'

'

'

'

87

'

'

'

'

Other comprehensive income (loss), net of tax

22

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Jun. 30, 2014

'

'

'

'

'

'

'

'

'

'

10,657

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Jun. 30, 2014

$40,881

'

'

'

'

'

'

'

'

'

'

'

'

'

$10,733

$0

$7,467

'

'

'

'

'

$5,734

'

'

$4,924

$1,762

'

'

$4,172

$762

'

'

$0

$3,914

'

'

'

'

Balance, in shares at Jun. 30, 2014

707,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

100

'

'

'

'

'

'

'

160,000,000

'

'

100

'

'

'

89,663,086

'

'

'

'

53,913,701

'

'

'

'

Organization_and_Basis_of_Pres

Organization and Basis of Presentation

6 Months Ended

Jun. 30, 2014

Accounting Policies [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

17

Duke Energy Corporation

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

Duke Energy Carolinas, LLC

•

•

•

•

•

•

•

•

•

•

•

•

•

Progress Energy, Inc.

•

•

•

•

•

•

•

•

•

•

•

•

•

•

Duke Energy Progress, Inc.

•

•

•

•

•

•

•

•

•

•

•

•

•

Duke Energy Florida, Inc.

•

•

•

•

•

•

•

•

•

•

•

•

•

Duke Energy Ohio, Inc.

•

•

•

•

•

•

•

•

•

•

•

•

•

•

Duke Energy Indiana, Inc.

•

•

•

•

•

•

•

•

•

•

•

•

•

ORGANIZATION AND BASIS OF PRESENTATION

NATURE OF OPERATIONS AND BASIS OF CONSOLIDATION

Duke Energy Corporation (collectively with its subsidiaries, Duke Energy) is an energy company headquartered in Charlotte, North Carolina, subject to regulation by the Federal Energy Regulatory Commission (FERC). Duke Energy operates in the United States (U.S.) and Latin America primarily through its direct and indirect subsidiaries. Duke Energy’s subsidiaries include its subsidiary registrants, Duke Energy Carolinas, LLC (Duke Energy Carolinas); Progress Energy, Inc. (Progress Energy); Duke Energy Progress, Inc. (Duke Energy Progress); Duke Energy Florida, Inc. (Duke Energy Florida); Duke Energy Ohio, Inc. (Duke Energy Ohio) and Duke Energy Indiana, Inc. (Duke Energy Indiana). When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of its six separate subsidiary registrants (collectively referred to as the Subsidiary Registrants), which, along with Duke Energy, are collectively referred to as the Duke Energy Registrants.

These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries where the respective Duke Energy Registrants have control. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities.

Duke Energy Carolinas is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the North Carolina Utilities Commission (NCUC), Public Service Commission of South Carolina (PSCSC), U.S. Nuclear Regulatory Commission (NRC) and FERC. Substantially all of Duke Energy Carolinas’ operations qualify for regulatory accounting.

Progress Energy is a public utility holding company headquartered in Raleigh, North Carolina, subject to regulation by the FERC. Progress Energy conducts operations through its wholly owned subsidiaries, Duke Energy Progress and Duke Energy Florida. Substantially all of Progress Energy’s operations qualify for regulatory accounting.

Duke Energy Progress is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Progress is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Substantially all of Duke Energy Progress’ operations qualify for regulatory accounting.

Duke Energy Florida is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Florida. Duke Energy Florida is subject to the regulatory provisions of the Florida Public Service Commission (FPSC), NRC and FERC. Substantially all of Duke Energy Florida’s operations qualify for regulatory accounting.

Duke Energy Ohio is a public utility that provides service in portions of Ohio and Kentucky. Operations in Kentucky are conducted through its wholly owned subsidiary, Duke Energy Kentucky, Inc. (Duke Energy Kentucky). Duke Energy Ohio’s principal lines of business include transmission and distribution of electricity and the sale of and/or transportation of natural gas. Duke Energy Ohio also generates and sells power into wholesale energy markets. Duke Energy Ohio conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers. Duke Energy Kentucky’s principal lines of business include generation, transmission and distribution of electricity, as well as the sale of and/or transportation of natural gas. References herein to Duke Energy Ohio include Duke Energy Ohio and its subsidiaries, unless otherwise noted. Duke Energy Ohio is subject to the regulatory provisions of the Public Utilities Commission of Ohio (PUCO), Kentucky Public Service Commission (KPSC) and FERC. Duke Energy Ohio applies regulatory accounting to a portion of its operations.

Duke Energy Indiana is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Indiana. Duke Energy Indiana is subject to the regulatory provisions of the Indiana Utility Regulatory Commission (IURC) and the FERC. Substantially all of Duke Energy Indiana’s operations qualify for regulatory accounting.

Certain prior year amounts have been reclassified to conform to the current year presentation.

BASIS OF PRESENTATION

These Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. 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 in the U.S. for annual financial statements. Because the interim Condensed Consolidated Financial Statements and Notes do not include all information and notes required by GAAP in the U.S. for annual financial statements, the Condensed Consolidated Financial Statements and other information included in this quarterly report should be read in conjunction with the Consolidated Financial Statements and Notes in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2013.

These Condensed Consolidated Financial Statements reflect all normal recurring adjustments in the opinion of the respective companies’ management, 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.

UNBILLED REVENUE

Revenues on sales of electricity and gas are recognized when service is provided. Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns and meter reading schedules.

Unbilled revenues are included within Receivables and Restricted receivables of variable interest entities on the Condensed Consolidated Balance Sheets as shown in the following table.

(in millions)

June 30, 2014

December 31, 2013

Duke Energy

$

884

$

937

Duke Energy Carolinas

326

323

Progress Energy

269

189

Duke Energy Progress

157

120

Duke Energy Florida

112

69

Duke Energy Ohio

—

55

Duke Energy Indiana

27

5

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, Cinergy Receivables Company, LLC (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 12 for further information. These receivables for unbilled revenues are shown in the table below.

(in millions)

June 30, 2014

December 31, 2013

Duke Energy Ohio

$

64

$

89

Duke Energy Indiana

102

144

AMOUNTS ATTRIBUTABLE TO CONTROLLING INTERESTS

Loss From Discontinued Operations, net of tax presented on the respective Condensed Consolidated Statements of Operations for Duke Energy and Progress Energy is attributable only to controlling interests for all periods presented. Other comprehensive income reported on the respective Condensed Consolidated Statements of Equity for Duke Energy and Progress Energy is attributable only to controlling interests for all periods presented.

ACCUMULATED OTHER COMPREHENSIVE INCOME

For the three and six months ended June 30, 2014 and 2013, reclassifications out of accumulated other comprehensive income (AOCI) for the Duke Energy Registrants were not material. Changes in AOCI for the Duke Energy Registrants are presented in their respective Condensed Consolidated Statements of Equity.

EXCISE TAXES

Certain excise taxes levied by state or local governments are required to be paid even if not collected from the customer. These taxes are recognized on a gross basis. Otherwise, the taxes are accounted for net. Excise taxes accounted for on a gross basis as operating revenues in the Condensed Consolidated Statements of Operations were as follows.

Three Months Ended June 30,

Six Months Ended June 30,

(in millions)

2014

2013

2014

2013

Duke Energy

$

151

$

142

$

318

$

291

Duke Energy Carolinas

43

37

89

78

Progress Energy

74

73

151

141

Duke Energy Progress

24

27

56

55

Duke Energy Florida

50

46

95

86

Duke Energy Ohio

25

24

59

55

Duke Energy Indiana

9

8

19

17

NEW ACCOUNTING STANDARDS

The new accounting standards adopted in 2014 and 2013 had no significant impact on the presentation or results of operations, cash flows or financial position of the Duke Energy Registrants. Disclosures have been enhanced to provide a discussion and tables on derivative contracts subject to enforceable master netting agreements.

The following new Accounting Standards Updates (ASUs) have been issued, but have not yet been adopted by the Duke Energy Registrants, as of June 30, 2014.

ASC 205 — Reporting Discontinued Operations. In April 2014, the FASB issued revised accounting guidance for reporting discontinued operations. A discontinued operation would be either (i) a component of an entity or a group of components of an entity that represents a separate major line of business or major geographical area of operations that either has been disposed of or is part of a single coordinated plan to be classified as held for sale or (ii) a business that, on acquisition, meets the criteria to be classified as held for sale.

For the Duke Energy Registrants, this guidance is effective on a prospective basis for interim and annual periods beginning January 1, 2015. This guidance will also result in increased disclosures. In general, this guidance is likely to result in fewer disposals of assets qualifying as discontinued operations.

ASC 606 - Revenue from Contracts with Customers. In May 2014, the FASB issued revised accounting guidance for revenue recognition from contracts with customers. The core principle of this guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.

For the Duke Energy Registrants, this guidance is effective for interim and annual periods beginning January 1, 2017. Duke Energy is currently evaluating the potential impact of the adoption of this revised accounting guidance on its revenue recognition and is unable to estimate at this time the impact of adoption on its consolidated results of operations, cash flows, financial position or disclosures.

Acquisitions_and_Dispositions

Acquisitions and Dispositions	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Acquisitions and Dispositions	'
	ACQUISITIONS AND DISPOSITIONS
	Purchase of NCEMPA's Generation
	On July 25, 2014, Duke Energy Progress executed an agreement to purchase North Carolina Eastern Municipal Power Agency’s (NCEMPA) ownership interests in certain generating assets jointly owned with and operated by Duke Energy Progress. The agreement provides for the acquisition of a total of approximately 700 MW at Brunswick Nuclear Station, Harris Nuclear Station, Mayo Steam Station and Roxboro Steam Station. The purchase price for the ownership interest and fuel and spare parts inventory is approximately $1.2 billion. Under the agreement, Duke Energy Progress and NCEMPA will enter into a 30-year wholesale power supply agreement to continue meeting the needs of NCEMPA’s customers. There are several state and federal regulatory approvals required prior to completing the transaction. The agreement requires the transaction to be completed by the end of 2016.
	Midwest Generation Exit
	On February 17, 2014, Duke Energy Ohio announced it had initiated a process to exit its nonregulated Midwest generation business. Duke Energy Ohio expects to dispose of the nonregulated Midwest generation business by the end of the first quarter of 2015. Based on this expected sale date, Duke Energy Ohio triggered held-for-sale accounting treatment on March 31, 2014. Duke Energy and Duke Energy Ohio have classified the assets and associated liabilities of this business as held for sale in the Condensed Consolidated Balance Sheet at June 30, 2014.
	Duke Energy and Duke Energy Ohio each recorded pretax impairments on these assets of approximately $1,402 million and $1,438 million, respectively, for the six months ended June 30, 2014, which represents the excess of the carrying value over the estimated fair value of the business, less estimated costs to sell. These losses were included in Impairment charges in the Condensed Consolidated Statements of Operations and Comprehensive Income. The fair value of the disposal group was based on the income approach, which estimates fair value using discounted cash flows, and indicative bids received to date. The impairment will be updated, if necessary, based on changes in estimated fair value as additional information related to the potential transaction becomes available.
	Duke Energy and Duke Energy Ohio ceased depreciating the fixed assets of the disposal group on March 31, 2014. Duke Energy and Duke Energy Ohio avoided depreciation expense of $42 million for the three and six months ended June 30, 2014.
	The nonregulated Midwest generation business is included in the Commercial Power segment. The following table presents information related to the Duke Energy Ohio generation plants included in the disposal group.
	Facility	Plant Type		Primary Fuel	Location		Total Average MW Capacity(c)	Owned Average MW Capacity(c)	Ownership Interest
	Stuart(a)(b)	Fossil Steam		Coal	OH		2,318	904	39	%
	Zimmer(a)	Fossil Steam		Coal	OH		1,338	622	46.5	%
	Hanging Rock	Combined Cycle		Gas	OH		1,274	1,274	100	%
	Miami Fort (Units 7 and 8)(a)	Fossil Steam		Coal	OH		1,020	653	64	%
	Conesville(a)(b)	Fossil Steam		Coal	OH		780	312	40	%
	Washington	Combined Cycle		Gas	OH		637	637	100	%
	Fayette	Combined Cycle		Gas	PA		640	640	100	%
	Killen(a)(b)	Fossil Steam		Coal	OH		618	204	33	%
	Lee	Combustion Turbine		Gas	IL		640	640	100	%
	Dick's Creek	Combustion Turbine		Gas	OH		136	136	100	%
	Miami Fort	Combustion Turbine		Oil	OH		68	68	100	%
	Total Midwest Generation						9,469	6,090
	(a)	Jointly owned with Ohio Power Company and/or The Dayton Power & Light Company.
	(b)	Station is not operated by Duke Energy Ohio.
	(c)	Average MW capacity is calculated as the average of winter capacity and summer capacity.
	The disposal group also includes a retail sales business owned by Duke Energy. In the second quarter of 2014, Duke Energy Ohio removed Ohio Valley Electric Corporation (OVEC) from the disposal group as it no longer intends to sell it with the nonregulated Midwest generation business. Duke Energy Ohio has requested cost-based recovery of its contractual entitlement in OVEC in its 2014 Electric Security Plan (ESP) application filed on May 29, 2014. See Note 4 for information related to the 2014 ESP.
	The following table presents the carrying values of the major classes of Assets held for sale and Liabilities associated with assets held for sale included in the Midwest generation disposal group in the Condensed Consolidated Balance Sheets. Amounts included in the following table exclude certain other disposal groups which are not material and accordingly do not agree to amounts presented in the Duke Energy Condensed Consolidated Balance Sheets.
		June 30, 2014
	(in millions)	Duke Energy			Duke Energy Ohio
	Current assets	$	409		$	359
	Investments and other assets	42			37
	Property, plant and equipment	2,153			2,116
	Total assets held for sale	$	2,604		$	2,512
	Current liabilities	$	271		$	257
	Deferred credits and other liabilities	75			74
	Total liabilities associated with assets held for sale	$	346		$	331

Business_Segments

Business Segments	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Business Segments	'
	BUSINESS SEGMENTS
	Duke Energy evaluates segment performance based on segment income. Segment income is defined as income from continuing operations net of income attributable to noncontrolling interests. Segment income, as discussed below, includes intercompany revenues and expenses that are eliminated in the Condensed Consolidated Financial Statements. Certain governance costs are allocated to each segment. In addition, direct interest expense and income taxes are included in segment income.
	Operating segments are determined based on information used by the chief operating decision maker in deciding how to allocate resources and evaluate the performance.
	Products and services are sold between affiliate companies and reportable segments of Duke Energy at cost. Segment assets as presented in the tables that follow exclude all intercompany assets.
	DUKE ENERGY
	Duke Energy has the following reportable operating segments: Regulated Utilities, International Energy and Commercial Power.
	Regulated Utilities conducts operations primarily through Duke Energy Carolinas, Duke Energy Progress, Duke Energy Florida, Duke Energy Indiana, and the regulated transmission and distribution operations of Duke Energy Ohio. These electric and gas operations are subject to the rules and regulations of the FERC, NCUC, PSCSC, FPSC, PUCO, IURC and KPSC. Substantially all of Regulated Utilities’ operations are regulated and, accordingly, these operations qualify for regulatory accounting treatment.
	International Energy principally operates and manages power generation facilities and engages in sales and marketing of electric power, natural gas and natural gas liquids outside the U.S. Its activities principally target power generation in Latin America. Additionally, International Energy owns a 25 percent interest in National Methanol Company (NMC), a large regional producer of methyl tertiary-butyl ether (MTBE) located in Saudi Arabia. The investment in NMC is accounted for under the equity method of accounting.
	Commercial Power owns, operates and manages power plants and engages in the wholesale marketing and procurement of electric power, fuel and emission allowances related to these plants as well as other contractual positions. Commercial Power’s generation operations consist primarily of Duke Energy Ohio’s coal-fired and gas-fired nonregulated generation assets located in the Midwest region of the U.S. and wind and solar generation located throughout the U.S. The asset portfolio has a diversified fuel mix with baseload and mid-merit coal-fired units as well as combined cycle and peaking natural gas-fired units. In addition, Commercial Power operates and develops transmission projects.
	The remainder of Duke Energy’s operations is presented as Other. While it is not an operating segment, Other primarily includes unallocated corporate interest expense, certain unallocated corporate costs, Bison Insurance Company Limited (Bison), Duke Energy’s wholly owned, captive insurance subsidiary, and contributions to the Duke Energy Foundation. On December 31, 2013, Duke Energy sold its interest in DukeNet Communications Holdings, LLC (DukeNet) to Time Warner Cable, Inc.
		Three Months Ended June 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	5,272		$	364		$	304		$	5,940		$	9		$	—		$	5,949
	Intersegment revenues	11			—			5			16			19			(35		)	—
	Total revenues	$	5,283		$	364		$	309		$	5,956		$	28		$	(35	)	$	5,949
	Segment income (loss)(a)(b)	$	689		$	146		$	(120	)	$	715		$	(103	)	$	—		$	612
	Add back noncontrolling interests component																			4
	Loss from discontinued operations, net of tax																			(3		)
	Net income																			$	613
	Segment assets	$	101,070		$	5,463		$	5,652		$	112,185		$	2,807		$	181		$	115,173
	(a)	Commercial Power includes a mark-to-market loss of $136 million, net of a tax benefit of $77 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Three Months Ended June 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)	$	4,911		$	406		$	547		$	5,864		$	15		$	—		$	5,879
	Intersegment revenues	9			—			10			19			21			(40		)	—
	Total revenues	$	4,920		$	406		$	557		$	5,883		$	36		$	(40	)	$	5,879
	Segment income (loss)(a)(b)(c)(d)(e)	$	353		$	87		$	41		$	481		$	(139	)	$	—		$	342
	Add back noncontrolling interests component																			3
	Loss from discontinued operations, net of tax																			(3		)
	Net income																			$	342
	(a)	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
	(b)	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates beginning in June 2013. This rate increase impacts Regulated Utilities.
	(c)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
	(d)	Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at the Shearon Harris Nuclear Station (Harris) site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
	(e)	Other includes costs to achieve the Progress Energy merger.
		Six Months Ended June 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	11,067		$	746		$	746		$	12,559		$	14		$	—		$	12,573
	Intersegment revenues	21			—			12			33			39			(72		)	—
	Total revenues	$	11,088		$	746		$	758		$	12,592		$	53		$	(72	)	$	12,573
	Segment income (loss)(a)(b)(c)	$	1,426		$	276		$	(999	)	$	703		$	(185	)	$	—		$	518
	Add back noncontrolling interests component																			8
	Loss from discontinued operations, net of tax																			(6		)
	Net income																			$	520
	(a)	Commercial Power includes an impairment charge related to the planned disposition of the Midwest Generation assets. See Note 2 for additional information.
	(b)	Commercial Power includes a mark-to-market loss of $158 million, net of a tax benefit of $89 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	(c)	Other includes costs to achieve the Progress Energy merger.
		Six Months Ended June 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)	$	9,963		$	798		$	986		$	11,747		$	30		$	—		$	11,777
	Intersegment revenues	17			—			23			40			41			(81		)	—
	Total revenues	$	9,980		$	798		$	1,009		$	11,787		$	71		$	(81	)	$	11,777
	Segment income(a)(b)(c)(d)(e)	$	1,009		$	184		$	(1	)	$	1,192		$	(216	)	$	—		$	976
	Add back noncontrolling interest																			3
Loss from discontinued operations, net of tax																			(3		)
Net income																			$	976
(a)	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
(b)	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates in the first year beginning in June 2013. This rate increase impacts Regulated Utilities.
(c)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
(d)	Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at the Shearon Harris Nuclear Station (Harris) site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
(e)	Other includes costs to achieve the Progress Energy merger.
DUKE ENERGY OHIO
Duke Energy Ohio has two reportable operating segments, Regulated Utilities and Commercial Power.
Regulated Utilities transmits and distributes electricity in portions of Ohio and generates, distributes and sells electricity in portions of Kentucky. Regulated Utilities also transports and sells natural gas in portions of Ohio and northern Kentucky. It conducts operations primarily through Duke Energy Ohio and its wholly owned subsidiary, Duke Energy Kentucky.
Commercial Power owns, operates and manages power plants and engages in the wholesale marketing and procurement of electric power, fuel and emission allowances related to these plants, as well as other contractual positions.
The remainder of Duke Energy Ohio’s operations is presented as Other. While it is not considered an operating segment, Other primarily includes certain governance costs allocated by its parent, Duke Energy. See Note 8 for additional information. All of Duke Energy Ohio’s revenues are generated domestically and its long-lived assets are all in the U.S.
	Three Months Ended June 30, 2014
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues(a)	$	415		$	116		$	531		$	—		$	—		$	531
Intersegment revenues	—			5			5			—			(5		)	—
Total revenues	$	415		$	121		$	536		$	—		$	(5	)	$	531
Segment income (loss) / Consolidated net income(a)(b)	$	52		$	(154	)	$	(102	)	$	(5	)	$	—		$	(107	)
Segment assets	$	7,203		$	2,818		$	10,021		$	103		$	(555	)	$	9,569
(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
(b)	Commercial Power includes an after-tax mark-to-market loss of $148 million, net of a tax benefit of $84 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	Three Months Ended June 30, 2013
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues(a)	$	404		$	407		$	811		$	—		$	—		$	811
Intersegment revenues	—			8			8			—			(8		)	—
Total revenues	$	404		$	415		$	819		$	—		$	(8	)	$	811
Segment income / Consolidated net income(a)	$	27		$	35		$	62		$	(4	)	$	—		$	58
(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
	Six Months Ended June 30, 2014
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues(a)	$	977		$	317		$	1,294		$	—		$	—		$	1,294
Intersegment revenues	—			12			12			—			(12		)	—
Total revenues	$	977		$	329		$	1,306		$	—		$	(12	)	$	1,294
Segment income (loss) / Consolidated net loss(a)(b)(c)	$	116		$	(1,105	)	$	(989	)	$	(8	)	$	—		$	(997	)
(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
(b)	Commercial Power includes an impairment charge related to the planned disposition of the Midwest Generation assets. See Note 2 for additional information.
(c)	Commercial Power includes an after-tax mark-to-market loss of $181 million, net of a tax benefit of $101 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	Six Months Ended June 30, 2013
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues(a)	$	896		$	662		$	1,558		$	—		$	—		$	1,558
Intersegment revenues	—			19			19			—			(19		)	—
Total revenues	$	896		$	681		$	1,577		$	—		$	(19	)	$	1,558
Segment income (loss) / Consolidated net income(a)	$	80		$	(33	)	$	47		$	(10	)	$	—		$	37
(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
DUKE ENERGY CAROLINAS, PROGRESS ENERGY, DUKE ENERGY PROGRESS, DUKE ENERGY FLORIDA AND DUKE ENERGY INDIANA
The remaining Subsidiary Registrants each have one reportable operating segment, Regulated Utility, which generates, transmits, distributes and sells electricity. The remainder of each company’s operations is classified as Other. While not considered a reportable segment for any of these companies, Other consists of certain unallocated corporate costs. Other for Progress Energy also includes interest expense on corporate debt instruments of $60 million and $70 million for the three months ended June 30, 2014 and 2013, respectively and of $123 million and $171 million for the six months ended June 30, 2014 and 2013, respectively. The following table summarizes the net loss for Other at each of these registrants.
	Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2014			2013			2014			2013
Duke Energy Carolinas	$	(27	)	$	(25	)	$	(48	)	$	(43	)
Progress Energy	(45		)	(55		)	(97		)	(133		)
Duke Energy Progress	(3		)	(14		)	(13		)	(20		)
Duke Energy Florida	(7		)	(7		)	(11		)	(12		)
Duke Energy Indiana	(4		)	(4		)	(7		)	(8		)
The respective Regulated Utility operating segments include substantially all of Duke Energy Carolinas’, Progress Energy’s, Duke Energy Progress’, Duke Energy Florida’s and Duke Energy Indiana’s assets at June 30, 2014.

Regulatory_Matters

Regulatory Matters

6 Months Ended

Jun. 30, 2014

Regulated Operations [Abstract]

'

Regulatory Matters

'

REGULATORY MATTERS

RATE RELATED INFORMATION

The NCUC, PSCSC, FPSC, IURC, PUCO 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.

Duke Energy Carolinas

2013 North Carolina Rate Case

On September 24, 2013, the NCUC approved a settlement agreement related to Duke Energy Carolinas’ request for a rate increase with minor modifications. The parties agreed to a three-year step-in rate increase, with the first two years providing for $204 million, or a 4.5 percent average increase in rates, and the third year providing for rates to be increased by an additional $30 million, or 0.6 percent. The agreement is based upon a return on equity of 10.2 percent and an equity component of the capital structure of 53 percent. New rates went into effect on September 25, 2013.

On October 23, 2013, the North Carolina Attorney General (NCAG) appealed the rate of return and capital structure approved in the agreement. On October 24, 2013, the NC Waste Awareness and Reduction Network (NC WARN) also appealed various matters in the settlement. The North Carolina Supreme Court (NCSC) denied a motion to consolidate these appeals with other North Carolina rate case appeals involving Duke Energy Carolinas and Duke Energy Progress on March 13, 2014. Briefing has concluded in this matter and oral argument has been scheduled for September 8, 2014. Duke Energy Carolinas cannot predict the outcome of this matter.

2011 North Carolina Rate Case

On January 27, 2012, the NCUC approved a settlement agreement related to Duke Energy Carolinas’ request for a rate increase. The Public Staff was a party to the settlement. On October 23, 2013, the NCUC reaffirmed the rate of return approved in the settlement agreement, in response to an appeal by the NCAG. On November 21, 2013, the NCAG appealed the reaffirmed order. The NCSC denied a motion to consolidate this appeal with other North Carolina rate case appeals involving Duke Energy Carolinas and Duke Energy Progress on March 13, 2014. Briefing has concluded in this matter and oral argument has been scheduled for September 8, 2014. Duke Energy Carolinas cannot predict the outcome of this matter.

William States Lee Combined Cycle Facility

On April 9, 2014, the PSCSC granted Duke Energy Carolinas and North Carolina Electric Membership Corporation (NCEMC) a Certificate of Environmental Compatibility and Public Convenience and Necessity (CECPCN) for the construction and operation of a 750 MW combined cycle natural gas-fired generating plant at its existing William States Lee Generating Station in Anderson, South Carolina. On May 16, 2014, Duke Energy Carolinas announced its intention to begin construction in summer 2015 and estimates a cost to build of $600 million for its share of the facility, including AFUDC. The project is expected to be commercially available in late 2017. NCEMC will own approximately 13 percent of the project. On July 3, 2014, the South Carolina Coastal Conservation League (SCCCL) and Southern Alliance for Clean Energy (SACE) jointly filed a Notice of Appeal with the Court of Appeals of South Carolina seeking the court's review of the PSCSC's decision. Duke Energy Carolinas cannot predict the outcome of this matter.

Duke Energy Progress

2012 North Carolina Rate Case

On May 30, 2013, the NCUC approved a settlement agreement related to Duke Energy Progress’ request for a rate increase. The Public Staff was a party to the settlement agreement. The parties agreed to a two-year step-in rate increase, with the first year providing for a $147 million, or a 4.5 percent average increase in rates, and the second year providing for rates to be increased by an additional $31 million, or a 1.0 percent average increase in rates. The agreement is based upon a return on equity of 10.2 percent and an equity component of the capital structure of 53 percent. The initial rate increase went into effect on June 1, 2013 and the step-in rate increase went into effect in June 2014.

On July 1, 2013, the NCAG appealed the NCUC’s approval of the rate of return and capital structure included in the agreement. NC WARN also appealed various matters in the settlement. The NCSC denied a motion to consolidate these appeals with other North Carolina rate case appeals involving Duke Energy Carolinas and Duke Energy Progress on March 13, 2014. Briefing has concluded in this matter and oral argument was held on May 5, 2014. Duke Energy Progress cannot predict the outcome of this matter.

Shearon Harris Nuclear Station Expansion

In 2006, Duke Energy Progress selected a site at Harris to evaluate for possible future nuclear expansion. On February 19, 2008, Duke Energy Progress filed its COL application with the NRC for two Westinghouse Electric AP1000 reactors at Harris, which the NRC docketed for review. On May 2, 2013, Duke Energy Progress filed a letter with the NRC requesting the NRC to suspend its review activities associated with the COL at the Harris site. As a result of the decision to suspend the COL applications, during the second quarter of 2013, Duke Energy Progress recorded a pretax impairment charge of $22 million, which represented costs associated with the COL, which were not probable of recovery. As of June 30, 2014, approximately $48 million is recorded in Regulatory assets on Duke Energy Progress' Condensed Consolidated Balance Sheet.

Wholesale Depreciation Rates

On April 19, 2013, Duke Energy Progress filed an application with FERC for acceptance of changes to generation depreciation rates and in August filed for acceptance of additional changes. These changes will affect the rates of Duke Energy Progress wholesale power customers that purchase or will purchase power under formula rates. Certain Duke Energy Progress wholesale customers filed interventions and protests. FERC accepted the depreciation rate changes, subject to refund, and set the matter for settlement and hearing in a consolidated proceeding. FERC further initiated an action with respect to the justness and reasonableness of the proposed rate changes. The parties are engaged in settlement discussions. Duke Energy Progress cannot predict the outcome of this matter.

Duke Energy Florida

FPSC Settlement Agreements

On February 22, 2012, the FPSC approved a settlement agreement (the 2012 Settlement) among Duke Energy Florida, the Florida Office of Public Counsel (OPC) and other customer advocates. The 2012 Settlement was to continue through the last billing cycle of December 2016. On October 17, 2013, the FPSC approved a settlement agreement (the 2013 Settlement) between Duke Energy Florida, OPC, and other customer advocates. The 2013 Settlement replaces and supplants the 2012 Settlement and substantially resolves issues related to (i) Crystal River Unit 3, (ii) Levy, (iii) Crystal River 1 and 2 coal units, and (iv) future generation needs in Florida. Refer to the remaining sections below and the 2013 Annual Report on Form 10-K for further discussion of these settlement agreements.

Crystal River Unit 3

On February 5, 2013, Duke Energy Florida announced the retirement of Crystal River Unit 3. On February 20, 2013, Duke Energy Florida filed with the NRC a certification of permanent cessation of power operations and permanent removal of fuel from the reactor vessel. In December 2013, and March 2014, Duke Energy Florida filed an updated site-specific decommissioning plan with the NRC and FPSC, respectively. The plan included a decommissioning cost estimate of $1,180 million, including amounts applicable to joint owners, under the safe storage (SAFSTOR) option. Duke Energy Florida’s decommissioning study assumes Crystal River Unit 3 will be in SAFSTOR configuration, requiring limited staffing to monitor plant conditions, until the eventual dismantling and decontamination activities to be completed by 2073. This decommissioning approach is currently utilized at a number of retired domestic nuclear power plants and is one of three accepted approaches to decommissioning approved by the NRC.

Duke Energy Florida has reclassified all Crystal River Unit 3 investments, including property, plant and equipment, nuclear fuel, inventory, and other assets, to a regulatory asset. Duke Energy agreed to forego recovery of $295 million of regulatory assets and an impairment charge was recorded in the second quarter of 2013 for this matter. Duke Energy Florida is allowed to accelerate cash recovery of approximately $130 million of the Crystal River Unit 3 regulatory asset from retail customers from 2014 through 2016 through its fuel clause. Duke Energy Florida will begin recovery of the remaining Crystal River Unit 3 regulatory asset, up to a cap of $1,466 million from retail customers upon the earlier of (i) full recovery of the uncollected Levy investment or (ii) the first billing period of January 2017. Recovery will continue 240 months from inception of collection of the regulatory asset in base rates. The Crystal River Unit 3 base rate component will be adjusted at least every four years.

Included in this recovery, but not subject to the cap, are costs of building an Independent Spent Fuel Storage Installation (ISFSI). The return rate will be based on the currently approved AFUDC rate with a return on equity of 7.35 percent, or 70 percent of the currently approved 10.5 percent. The return rate is subject to change if the return on equity changes in the future. In May 2014, Duke Energy Florida petitioned the FPSC for approval of the decision to construct the ISFSI and approval of an accounting order to defer amortization of the ISFSI construction pending resolution of its litigation against the federal government as a result of the Department of Energy's breach of its obligation to remove the spent nuclear fuel. The regulatory asset associated with the original power uprate project to increase generating capacity and replace two steam generators will continue to be recovered through the Nuclear Cost Recovery Clause (NCRC) over an estimated seven year period beginning in 2013.

Through June 30, 2014, Duke Energy Florida deferred $1,337 million for rate recovery related to Crystal River Unit 3, which is subject to the rate recovery cap in the 2013 Settlement. In addition, Duke Energy Florida deferred $281 million for recovery associated with building an ISFSI and the original uprate project, which is not subject to the rate recovery cap discussed above. Duke Energy Florida does not expect the Crystal River Unit 3 costs to exceed the cap.

The following table includes a summary of retail customer refunds agreed to in the 2012 Settlement and the 2013 Settlement. Refer to the 2013 Annual Report on Form 10-K for additional information on each of these refunds.

June 30, 2014

Remaining Amount to be Refunded

(in millions)

Total

Refunded to date

2014

2015

2016

2012 Settlement refund

$

288

$

199

$

69

$

10

$

10

Retirement decision refund

100

—

—

40

60

NEIL proceeds

490

408

82

—

—

Total customer refunds

$

878

607

151

50

70

Accelerated regulatory asset recovery

(130

)

(17

)

(20

)

(37

)

(56

)

Net customer refunds

$

748

$

590

$

131

$

13

$

14

Levy

On July 28, 2008, Duke Energy Florida applied to the NRC for a Combined Construction and Operating License (COL) for two Westinghouse AP1000 reactors at Levy. In 2008, the FPSC granted Duke Energy Florida’s petition for an affirmative Determination of Need and related orders requesting cost recovery under Florida’s nuclear cost-recovery rule, together with the associated facilities, including transmission lines and substation facilities.

On January 28, 2014, Duke Energy Florida terminated the Levy engineering, procurement and construction agreement (EPC). Duke Energy Florida may be required to pay for work performed under the EPC and to bring existing work to an orderly conclusion, including but not limited to costs to demobilize and cancel certain equipment and material orders placed. Duke Energy Florida recorded an exit obligation of $25 million upon termination of the EPC. This liability was recorded within Other in Deferred Credits and Other Liabilities with an offset primarily to Regulatory assets on the Condensed Consolidated Balance Sheets. Duke Energy Florida is allowed to recover reasonable and prudent EPC cancellation costs from its retail customers. See Note 5 for a discussion of litigation related to the EPC termination.

The 2012 Settlement provided that Duke Energy Florida include the allocated wholesale cost of Levy as a retail regulatory asset and include this asset as a component of rate base and amortization expense for regulatory reporting. In accordance with the 2013 Settlement, Duke Energy Florida ceased amortization of the wholesale allocation of Levy investments against retail rates. In the second quarter of 2013, Duke Energy Florida recorded a pretax charge of $65 million to write off the wholesale portion of Levy investments. This amount is included in Impairment charges on Duke Energy Florida's Condensed Statements of Operations and Comprehensive Income.

Recovery of the remaining retail portion of the project costs will occur over five years from 2013 through 2017. Duke Energy Florida has an ongoing responsibility to demonstrate prudency related to the wind down of the Levy investment and the potential for salvage of Levy assets. As of June 30, 2014, Duke Energy Florida has a net uncollected investment in Levy of approximately $233 million, including AFUDC. Of this amount, $18 million is included in Regulatory assets, $120 million related to land and the COL is included in Net, property, plant and equipment, and $95 million is included in Regulatory assets within Current Assets on the Condensed Consolidated Balance Sheets.

New Generation

The 2013 Settlement establishes a recovery mechanism for additional generation needs. This recovery mechanism, the Generation Base Rate Adjustment (GBRA), allows recovery of prudent costs of these items through an increase in base rates, upon the in-service date of such assets, without a general rate case at a 10.5 percent return on equity.

On May 27, 2014, Duke Energy Florida petitioned the FPSC for a Determination of Need to (i) construct a 1,640 MW combined cycle natural gas plant in Citrus County, Florida to be in service in 2018 with an estimated cost of $1.5 billion, (ii) construct a 320 MW combustion turbine plant at its existing Suwannee generating facility with an estimated cost of $197 million, and (iii) add inlet chilling to its existing Hines combined cycle units which will increase the output of those units by 220 MW at an estimated cost of $160 million. These cost estimates include AFUDC. Hearings for these matters are scheduled for August and September 2014.

Cost of Removal Reserve

The 2012 Settlement and the 2013 Settlement provided Duke Energy Florida the discretion to reduce cost of removal amortization expense up to the balance in the cost of removal reserve until the earlier of its applicable cost of removal reserve reaching zero or the expiration of the 2013 Settlement. Duke Energy Florida was not allowed to reduce amortization expense if the reduction would cause it to exceed the appropriate high point of the return on equity range. Duke Energy Florida recognized a reduction in amortization expense of $17 million for the three months ended June 30, 2013 and $73 million for the six months ended June 30, 2013. Duke Energy Florida had no cost of removal reserves eligible for amortization to income remaining after December 31, 2013.

Duke Energy Ohio

2014 Electric Security Plan

On May 29, 2014, Duke Energy Ohio filed an application for approval of a standard service offer (SSO) in the form of an electric security plan (ESP), effective June 1, 2015. The proposed ESP includes a competitive procurement process for SSO load, a distribution capital investment rider, a tracking mechanism for incremental distribution costs caused by major storms, and a cost-based recovery of Duke Energy Ohio’s contractual entitlement in OVEC. The proposed plan also seeks rate design modifications and continuance, revision, or termination of existing riders. The case is scheduled for hearing beginning on September 8, 2014, although various intervenors have sought an approximate two-month delay in the hearing date. Duke Energy Ohio cannot predict the outcome of this matter.

2012 Natural Gas Rate Case

On November 13, 2013, the PUCO issued an order approving a settlement among Duke Energy Ohio, the PUCO Staff and intervening parties (the Gas Settlement). The Gas Settlement provided for (i) no increase in base rates for natural gas distribution service, (ii) a return on equity of 9.84 percent, and (iii) rider recovery of $56 million, excluding carrying costs, of environmental remediation costs associated with former manufactured gas plants (MGP) incurred through 2012. The MGP rider became effective in April 2014 for a five-year period. On March 31, 2014, Duke Energy Ohio filed an application with the PUCO to adjust the MGP rider for investigation and remediation costs incurred in 2013.

On May 14, 2014, the Ohio Supreme Court granted certain consumer groups' motion to stay the MGP rider pending their appeals of the PUCO approval of the Gas Settlement. The appellants, the PUCO and Duke Energy Ohio have all filed briefs addressing the merits of this matter with the Ohio Supreme Court. On July 29, 2014, the Ohio Supreme Court denied Duke Energy Ohio's motion to lift the stay, but did require appellants to post a bond. The court further directed parties to submit briefs, no later than August 13, 2014, to assist in setting an appropriate bond amount. Billing of the MGP rider was suspended in June 2014. Duke Energy Ohio cannot predict the outcome of this matter.

Regional Transmission Organization (RTO) Realignment

Duke Energy Ohio, including Duke Energy Kentucky, transferred control of its transmission assets from Midcontinent Independent System Operator, Inc. (MISO) to PJM Interconnection, LLC (PJM), effective December 31, 2011.

On December 22, 2010, the KPSC approved Duke Energy Kentucky’s request to effect the RTO realignment, subject to a commitment not to seek double-recovery in a future rate case of the transmission expansion fees that may be charged by MISO and PJM in the same period or overlapping periods.

On May 25, 2011, the PUCO approved a settlement between Duke Energy Ohio, Ohio Energy Group, the Office of Ohio Consumers’ Counsel and the PUCO Staff related to Duke Energy Ohio’s recovery of certain costs of the RTO realignment via a non-bypassable rider. Duke Energy Ohio is allowed to recover all MISO Transmission Expansion Project (MTEP) costs, including but not limited to Multi-Value Project (MVP) costs, directly or indirectly charged to Ohio customers. Duke Energy Ohio also agreed to vigorously defend against any charges for MVP projects from MISO.

Upon its exit from MISO on December 31, 2011, Duke Energy Ohio recorded a liability for its exit obligation and share of MTEP costs, excluding MVP. This liability was recorded within Other in Current liabilities and Other in Deferred credits and other liabilities on Duke Energy Ohio’s Condensed Consolidated Balance Sheets.

The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded obligations related to its withdrawal from MISO. As of June 30, 2014, $74 million is recorded as a Regulatory asset on Duke Energy Ohio's Condensed Consolidated Balance Sheets.

(in millions)

31-Dec-13

Provision /

Cash

30-Jun-14

Adjustments

Reductions

Duke Energy Ohio

$

95

$

1

$

(2

)

$

94

MVP. MISO approved 17 MVP proposals prior to Duke Energy Ohio’s exit from MISO on December 31, 2011. Construction of these projects is expected to continue through 2020. Costs of these projects, including operating and maintenance costs, property and income taxes, depreciation and an allowed return, are allocated and billed to MISO transmission owners.

On December 29, 2011, MISO filed a tariff with the FERC providing for the allocation of MVP costs to a withdrawing owner based on monthly energy usage. The FERC set for hearing (i) whether MISO’s proposed cost allocation methodology to transmission owners who withdrew from MISO prior to January 1, 2012 is consistent with the tariff at the time of their withdrawal from MISO, and, (ii) if not, what the amount of and methodology for calculating any MVP cost responsibility should be. On July 16, 2013, a FERC Administrative Law Judge (ALJ) issued an initial decision. Under this initial decision, Duke Energy Ohio would be liable for MVP costs. Duke Energy Ohio filed exceptions to the initial decision, requesting the FERC overturn the ALJ’s decision. After reviewing the initial decision, along with all exceptions and responses filed by the parties, the FERC will issue a final decision. Duke Energy Ohio fully intends to appeal to the federal court of appeals if the FERC affirms the ALJ’s decision. Duke Energy Ohio cannot predict the outcome of these proceedings.

In 2012, MISO estimated Duke Energy Ohio’s MVP obligation over the period from 2012 to 2071 at $2.7 billion, on an undiscounted basis. The estimated obligation is subject to great uncertainty including the ultimate cost of the projects, the annual costs of O&M, taxes and return over the project lives and the allocation to Duke Energy Ohio.

Duke Energy Indiana

Edwardsport IGCC Plant

On November 20, 2007, the IURC granted Duke Energy Indiana a Certificate of Public Convenience and Necessity (CPCN) for the construction of a 618MW IGCC power plant at Duke Energy Indiana’s existing Edwardsport Generating Station in Knox County, Indiana with a cost estimate of $1.985 billion assuming timely recovery of financing costs related to the project. The Citizens Action Coalition of Indiana, Inc., Sierra Club, Inc., Save the Valley, Inc., and Valley Watch, Inc. (collectively, the Joint Intervenors) were intervenors in several matters related to the Edwardsport IGCC Plant.

On December 27, 2012, the IURC approved a settlement agreement (2012 Edwardsport settlement) related to the cost increase for the construction of the project, including subdockets before the IURC related to the project. The Office of Utility Consumer Counselor (OUCC), the Duke Energy Indiana Industrial Group and Nucor Steel-Indiana were parties to the settlement. The settlement agreement, as approved, capped costs to be reflected in customer rates at $2.595 billion, including estimated AFUDC through June 30, 2012. Duke Energy Indiana is allowed to recover AFUDC after June 30, 2012, until customer rates are revised, with such recovery decreasing to 85 percent on AFUDC accrued after November 30, 2012.

The project was placed in commercial operation in June 2013. Costs for the Edwardsport IGCC plant are recovered from retail electric customers via a tracking mechanism, the IGCC rider. Updates to the IGCC rider are filed semi-annually. An order on the eleventh semi-annual IGCC rider is currently pending. The twelfth and thirteenth semi-annual IGGC riders have been combined and are scheduled for hearings in November 2014.

On March 18, 2014, the Indiana Court of Appeals denied an appeal filed by the Joint Intervenors and affirmed the IURC order approving the 2012 Edwardsport settlement and other related regulatory orders. On June 5, 2014, the Indiana Court of Appeals affirmed the decision on rehearing. The Joint Intervenors have requested to seek transfer to the Indiana Supreme Court.

On April 2, 2014, the IURC established a subdocket to Duke Energy Indiana’s current fuel adjustment clause proceeding. In this fuel adjustment subdocket, the IURC intends to review underlying causes for net negative generation amounts at the Edwardsport IGCC plant during the period September through November 2013. Duke Energy Indiana contends the net negative generation is related to the consumption of fuel and auxiliary power when the plant was in start-up or off line. In addition to the OUCC, the Duke Energy Indiana Industrial Group, Nucor Steel-Indiana, Steel Dynamics, Inc., and the Joint Intervenors are parties to the subdocket. The IURC has deferred the fuel adjustment subdocket until resolution of the twelfth and thirteenth semi-annual IGCC rider proceedings.

Duke Energy Indiana cannot predict the outcome of the fuel adjustment clause subdocket or pending and future IGCC Rider proceedings.

OTHER REGULATORY MATTERS

Merger Appeals

On January 9, 2013, the City of Orangeburg and NC WARN appealed the NCUC’s approval of the merger between Duke Energy and Progress Energy. On April 29, 2013, the NCUC granted Duke Energy’s motion to dismiss certain exceptions contained in NC WARN’s appeal.

On November 6, 2013, the North Carolina Court of Appeals heard oral arguments on the appeals. On March 4, 2014, the Court of Appeals issued an opinion affirming the NCUC’s approval of the merger. On April 8, 2014, NC WARN filed a petition for discretionary review by the North Carolina Supreme Court. On April 21, 2014, Duke Energy and the NCUC Public Staff jointly filed their response opposing NC WARN’s petition. The City of Orangeburg did not file a petition for discretionary review. Duke Energy cannot predict the outcome of these matters.

Progress Energy Merger FERC Mitigation

In June 2012, the FERC approved the merger with Progress Energy, including Duke Energy and Progress Energy’s revised market power mitigation plan, the Joint Dispatch Agreement (JDA) and the joint Open Access Transmission Tariff. On August 8, 2012, FERC granted certain intervenors’ request for rehearing for further consideration.

The revised market power mitigation plan provided for the acceleration of one transmission project and the completion of seven other transmission projects (Long-term FERC Mitigation) and interim firm power sale agreements during the completion of the transmission projects (Interim FERC Mitigation). The Long-term FERC Mitigation was expected to increase power imported into the Duke Energy Carolinas and Duke Energy Progress service areas and enhance competitive power supply options in the service areas. All of these projects were completed in 2014. On May 30, 2014, the Independent Monitor filed with FERC a final report stating that the Long-Term FERC Mitigation is complete. Therefore, Duke Energy Carolinas' and Duke Energy Progress' obligations associated with the Interim FERC Mitigation have terminated. In the second quarter of 2014, Duke Energy Progress recorded an $18 million partial reversal of an impairment recorded in the third quarter of 2012. This reversal adjusts the initial disallowance from the Long-term FERC mitigation and reflects updated information on the construction costs and in-service dates of the transmission projects.

Following the closing of the merger, outside counsel reviewed Duke Energy’s mitigation plan and discovered a technical error in the calculations. On December 6, 2013, Duke Energy submitted a filing to the FERC disclosing the error and arguing that no additional mitigation is necessary. On March 28, 2014, Duke Energy submitted responses to a FERC deficiency letter seeking additional information concerning the market power mitigation calculations. The City of New Bern filed a protest to Duke Energy’s response and requested that FERC order additional mitigation. Duke Energy cannot predict the outcome of this matter.

Planned and Potential Coal Plant Retirements

The Subsidiary Registrants periodically file Integrated Resource Plans (IRP) with their state regulatory commissions. The IRPs provide a view of forecasted energy needs over a 10 to 20-year period, and options being considered to meet those needs. Recent IRPs filed by the Subsidiary Registrants included planning assumptions to potentially retire certain coal-fired generating facilities in South Carolina, Florida, Indiana and Ohio earlier than their current estimated useful lives. The facilities do not have the requisite emission control equipment, primarily to meet EPA regulations recently approved or that are not yet effective.

The table below contains the net carrying value of generating facilities planned for early retirement or being evaluated for potential retirement included in Property, plant and equipment, net on the Consolidated Balance Sheets.

30-Jun-14

Duke Energy

Duke Energy Carolinas(b)

Progress Energy

Duke Energy Florida(c)

Duke Energy Ohio(d)

Duke Energy Indiana(e)

Capacity (in MW)

2,297

200

873

873

556

668

Remaining net book value (in millions)(a)

$

253

$

13

$

111

$

111

$

9

$

120

(a)

Included in Property, plant and equipment, net as of June 30, 2014, on the Condensed Consolidated Balance Sheets.

(b)

Includes Lee Units 1 and 2. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. Duke Energy Carolinas expects to retire or convert these units by December 2020 in conjunction with a settlement agreement associated with the Cliffside Unit 6 air permit.

(c)

Includes Crystal River Units 1 and 2.

(d)

Includes Beckjord Units 5 and 6 and Miami Fort Unit 6. Beckjord units have no remaining book value.

(e)

Includes Wabash River Units 2 through 6. Wabash River Unit 6 is being evaluated for potential conversion to gas. Duke Energy Indiana committed to retire or convert these units by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit.

Duke Energy continues to evaluate the potential need to retire these coal-fired generating facilities earlier than the current estimated useful lives, and plans to seek regulatory recovery for amounts that would not be otherwise recovered when any of these assets are retired. However, such recovery, including recovery of carrying costs on remaining book values, could be subject to future regulatory approvals and therefore cannot be assured.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	ENVIRONMENTAL
	Duke Energy is subject to international, federal, state, and local regulations regarding air and water quality, hazardous and solid waste disposal, and other environmental matters. The Subsidiary Registrants are subject to federal, state, and local regulations regarding air and water quality, hazardous and solid waste disposal and other environmental matters. These regulations can be changed from time to time, imposing new obligations on the Duke Energy Registrants.
	Remediation Activities
	The Duke Energy Registrants are responsible for environmental remediation at various contaminated sites. These include some 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, activities vary with site conditions and locations, 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 contamination 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. 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 in 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 Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Balance at beginning of period	$	79		$	11		$	27		$	8		$	19		$	27		$	7
	Provisions / adjustments	9			(1		)	4			3			1			5			—
	Cash reductions	(6		)	—			(4		)	(2		)	(2		)	(1		)	—
	Balance at end of period	$	82		$	10		$	27		$	9		$	18		$	31		$	7
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Balance at beginning of period	$	75		$	12		$	33		$	14		$	19		$	15		$	8
	Provisions / adjustments	4			—			4			1			3			(1		)	1
	Cash reductions	(12		)	—			(3		)	(1		)	(2		)	(6		)	(2		)
	Balance at end of period	$	67		$	12		$	34		$	14		$	20		$	8		$	7
	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 presented in the table below.
	(in millions)
	Duke Energy	$	90
	Duke Energy Carolinas	25
	Progress Energy	9
	Duke Energy Progress	2
	Duke Energy Florida	7
	Duke Energy Ohio	51
	Duke Energy Indiana	5
	Ash Basins
	On February 2, 2014, a break in a 48-inch stormwater pipe beneath an ash basin at Duke Energy Carolinas’ retired Dan River steam station caused a release of ash basin water and ash into the Dan River. On February 8, 2014, a permanent plug was installed in the 48-inch stormwater pipe, stopping the release of materials into the river. On February 21, 2014, a permanent plug was installed in a 36-inch stormwater pipe beneath the ash basin. Duke Energy Carolinas estimates 30,000 to 39,000 tons of ash and 24 million to 27 million gallons of basin water were released into the river during the incident. Duke Energy Carolinas incurred approximately $20 million of repairs and remediation expense related to this incident during the six months ended June 30, 2014. These amounts are recorded in Operations, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income. Duke Energy Carolinas will not seek recovery of these costs from ratepayers. In July, Duke Energy completed remediation work identified by EPA. Other costs related to the Dan River release and the overall ash management plan, including regulatory directives, natural resources damages, pending litigation, future claims or litigation, long-term environmental impact costs, long-term operational changes, and costs associated with new laws and regulations, cannot be reasonably estimated at this time. However, the total costs to be incurred for any potential additional remediation relating to the Dan River ash release are not expected to be material.
	Duke Energy has engaged third-party engineering experts to complete an independent engineering review of all its ash basins. Initial field work has been completed. Findings and recommendations are being reviewed with management and repair actions are being taken to address the findings. Duke Energy is also preparing a comprehensive, longer-term ash basin strategy, which will involve a site by site analysis of applicable laws, regulations, site characteristics, and engineering feasibility. We expect this work to be completed by the end of the year, with detailed engineering to follow. Each site is unique, and site-specific engineering will help determine the most appropriate closure method for that site.
	On March 12, 2014, Duke Energy issued a letter to the governor of the state of North Carolina and the secretary of the North Carolina Department of Environment and Natural Resources (DENR) outlining recommendations for near-term and longer-term action at its ash basins in North Carolina. Implementing the near-term recommendations and longer-term plans depends on receipt of various state and federal permits and determinations that these actions are prudent, cost-effective and environmentally sound. The near-term actions outlined in the letter include moving ash from basins at three coal plants to lined fill solutions, converting the remaining coal units to dry fly ash handling or retiring the units, and minimizing potential risk of an incident similar to Dan River by removing water from ash basins at all retired North Carolina coal plants.
	On April 22, 2014, a representative of Duke Energy appeared before the Environmental Review Commission of the North Carolina General Assembly and outlined cost estimates for a range of ash handling and ash basin closure options. The table below summarizes estimated costs of various potential approaches to ash management for North Carolina ash basins. These amounts represent a rough order of magnitude and are not detailed engineering grade estimates. The estimates assume coal ash will retain a non-hazardous designation by the EPA and exclude financing costs. Any ultimate activities and resultant costs will be dependent upon state and federal environmental requirements.
	(in billions)		Range
	Baseline assumptions(a)		$	2	-	$	2.5
	Estimated additional costs related to full excavation(b)		4		-	5.5
	Estimated additional costs related to all-dry systems(c)		1		-	2
	Total range of costs(d)		$	2	-	$	10
	(a)	Assumes (i) hybrid cap in place closure for ash basins at ten coal plants, (ii) excavation and relocation of ash to lined structural fills or landfills for the retired Dan River, Riverbend and Sutton coal plants, (iii) dry fly ash conversion at the Asheville units and Cliffside Unit 5, (iv) continued structural fill disposal for the Asheville coal plant, and (v) dry bottom ash handling conversions and fly ash reliability improvements. Includes costs for actions noted in the March 12, 2014 letter to the governor of North Carolina and existing plans to close ash basins.
	(b)	Represents estimated additional costs to excavate and relocate ash to lined landfills for the ten plants under hybrid cap in place closure in the baseline assumptions.
	(c)	Represents estimated additional costs to convert all active coal plants to all-dry pneumatic bottom ash handling systems and thermally-driven evaporation of other process water.
	(d)	On average, the allocation of these estimates is approximately 65 percent to Duke Energy Carolinas and 35 percent to Duke Energy Progress. However, this allocation could vary significantly based on site-specific compliance actions.
	The North Carolina Senate adopted a bill on June 25, 2014, which would (i) establish a Coal Ash Management Commission to oversee handling of coal ash within the state; (ii) prohibit construction of new and expansion of existing ash impoundments; (iii) require closure of ash impoundments at Asheville, Riverbend, Dan River and Sutton stations no later than August 1, 2019; (iv) require an evaluation and ranking of remaining ash impoundments in North Carolina with closure of all basins within no later than fifteen years, (v) establish requirements to deal with groundwater and surface water impacts from impoundments and (vi) enhance the level of regulation for structural fills utilizing coal ash. On July 3, 2014, the North Carolina House adopted its version of the bill with several differences including a variance procedure for compliance deadlines and modification of requirements regarding structural fills and compliance boundaries. Both proposed laws, as written, leave the decision on cost recovery determinations to the state utilities commissions after a moratorium ending no later than December 31, 2016. However, the proposed laws do not prohibit requests for regulatory deferral orders during the moratorium. The legislature appointed a conference committee to resolve differences in the two bills. However, the North Carolina General Assembly did not pass final legislation prior to adjourning its session in early August 2014. Coal ash legislation could be considered during a reconvened legislative session later in 2014.
	Duke Energy records asset retirement obligations when it has a legal obligation to incur retirement costs associated with the retirement of a long-lived asset and the obligation can be reasonably estimated. Duke Energy has not recorded an asset retirement obligation related to these proposals as a legal obligation has not yet been incurred. As the necessary approvals are obtained to permit the work to proceed an asset retirement obligation could be recorded. Cost recovery for these expenditures will be pursued through the normal ratemaking process with state utility commissions, which permits the recovery of necessary and prudently incurred costs associated with Duke Energy's regulated operations. While Duke Energy cannot predict the outcome of these matters, it believes compliance costs will be within the range outlined in the above table. However, ultimate costs will be largely dependent upon compliance alternatives allowed to meet requirements of the legislation, once enacted.
	LITIGATION
	Duke Energy
	Ash Basin Shareholder Derivative Litigation
	Two shareholder derivative lawsuits have been filed relating to the release at Dan River and to the management of Duke Energy’s ash basins. The first lawsuit was filed on May 21, 2014, in Delaware Chancery Court by shareholders Edward Tansey and the Police Retirement System of St. Louis and names as defendants several current and former Duke Energy officers and directors together with all current directors of Duke Energy (collectively, the “Duke Energy Defendants”). The second lawsuit was filed against the Duke Energy Defendants on July 18, 2014, in Delaware Chancery Court by shareholder Robert Reese. Duke Energy is named as a nominal defendant in both lawsuits.
	Both complaints allege the Duke Energy Defendants breached their fiduciary duties to the company by failing to adequately oversee Duke Energy’s ash basins since 2008 and that these breaches of fiduciary duty may have contributed to the incident at Dan River and continued thereafter. The Tansey complaint also asserts claims against the Duke Energy Defendants for corporate waste (relating to the money Duke Energy has and will spend as a result of the fines, penalties, and coal ash removal) and unjust enrichment (relating to the compensation and director remuneration that was received despite these alleged breaches of fiduciary duty). The lawsuits seek both injunctive relief against Duke Energy and restitution from the Duke Energy Defendants.
	On May 28, 2014, Duke Energy received a shareholder litigation demand letter sent on behalf of shareholder Mitchell Pinsly. The letter alleges that the members of the Duke Energy Board of Directors and certain officers breached their fiduciary duties by allowing the company to illegally dispose of and store coal ash pollutants. The letter demands that the Board of Directors take action to recover damages associated with those breaches of fiduciary duty; otherwise, the attorney will file a shareholder derivative action. By letter dated July 3, 2014, counsel for the shareholder was informed that the Board of Directors appointed a Demand Review Committee to evaluate the allegations in the Demand Letter.
	It is not possible to predict whether Duke Energy will incur any liability or to estimate the damages, if any, it might incur in connection with these matters.
	Progress Energy Merger Shareholder Litigation
	Duke Energy, the eleven members of the Duke Energy Board of Directors who were also members of the pre-merger Duke Energy Board of Directors (Legacy Duke Energy Directors) and certain Duke Energy officers are defendants in a purported securities class action lawsuit (Nieman v. Duke Energy Corporation, et al). This lawsuit consolidates three lawsuits originally filed in July 2012, and is pending in the United States District Court for the Western District of North Carolina. The plaintiffs allege federal Securities Act and Exchange Act claims based on allegations of materially false and misleading representations and omissions in the Registration Statement filed on July 7, 2011, and purportedly incorporated into other documents, all in connection with the post-merger change in CEO. The claims are purportedly brought on behalf of a class of all persons who purchased or otherwise acquired Duke Energy securities between June 11, 2012 and July 9, 2012. On July 26, 2013, the Magistrate Judge recommended the District Court Judge deny the defendants’ motion to dismiss. On October 2, 2013, the District Judge heard defendants’ objections to this recommendation. A decision is pending on the motion to dismiss. An attempt on May 14, 2014, to mediate the claims was unsuccessful.
	On May 31, 2013, the Delaware Chancery Court consolidated four shareholder derivative lawsuits filed in 2012. The Court also appointed a lead plaintiff and counsel for plaintiffs and designated the case as In Re Duke Energy Corporation Derivative Litigation. The lawsuit names as defendants the Legacy Duke Directors. Duke Energy is named as a nominal defendant. The case alleges claims for breach of fiduciary duties of loyalty and care in connection with the post-merger change in CEO. The case is stayed pending resolution of the Nieman v. Duke Energy Corporation, et al. case in North Carolina.
	Two shareholder Derivative Complaints, filed in 2012 in federal district court in Delaware, were consolidated as Tansey v. Rogers, et al. The case alleges claims for breach of fiduciary duty and waste of corporate assets, as well as claims under Section 14(a) and 20(a) of the Exchange Act. Duke Energy is named as a nominal defendant. On May 17, 2013, the judge granted the defendants' motion to stay the litigation until a decision is rendered on the motion to dismiss in the Nieman v. Duke Energy Corporation, et al. case in North Carolina.
	On August 3, 2012, Duke Energy was served with a shareholder Derivative Complaint, which was transferred to the North Carolina Business Court (Krieger v. Johnson, et al.). The lawsuit names as defendants William D. Johnson and the Legacy Duke Energy Directors. Duke Energy is named as a nominal defendant. The lawsuit alleges claims for breach of fiduciary duty in granting excessive compensation to Mr. Johnson. On April 30, 2014, the North Carolina Business Court granted the Legacy Duke Energy Directors’ motion to dismiss the lawsuit.
	It is not possible to estimate the maximum exposure of loss that may occur in connection with these lawsuits.
	Price Reporting Cases
	A total of five lawsuits were filed against Duke Energy affiliates and other energy companies and remain pending in a consolidated, single federal court proceeding in Nevada.
	Each of these cases contain similar claims that defendants allegedly manipulated natural gas markets by various means, including providing false information to natural gas trade publications and entering into unlawful arrangements and agreements in violation of the antitrust laws of the respective states. Plaintiffs seek damages in unspecified amounts.
	On July 18, 2011, the judge granted a defendant’s motion for summary judgment in two of the remaining five cases to which Duke Energy affiliates are a party. The U.S. Court of Appeals for the Ninth Circuit subsequently reversed the lower court’s decision. On July 1, 2014, the U.S. Supreme Court granted the defendants', including Duke Energy, petition for certiorari. The case will be heard during the next session of the court, which begins in October 2014.
	It is not possible to predict whether Duke Energy will incur any liability or to estimate the damages, if any, it might incur in connection with the remaining matters. However, based on Duke Energy’s past experiences with similar cases of this nature, it does not believe its exposure under these remaining matters is material.
	Brazil Expansion Lawsuit
	On August 9, 2011, the State of São Paulo sued Duke Energy International Geracao Paranapenema S.A. (DEIGP) in Brazilian state court. The lawsuit claims DEIGP is under a continuing obligation to expand installed generation capacity in the State of São Paulo by 15 percent pursuant to a stock purchase agreement under which DEIGP purchased generation assets from the state. On August 10, 2011, a judge granted an ex parte injunction ordering DEIGP to present a detailed expansion plan in satisfaction of the 15 percent obligation. DEIGP has previously taken a position the expansion obligation is no longer viable given changes that have occurred in the electric energy sector since privatization. DEIGP submitted its proposed expansion plan on November 11, 2011, but reserved objections regarding enforceability. No trial date has been set. It is not possible to predict whether Duke Energy will incur any liability or to estimate the damages, if any, it might incur in connection with this matter.
Duke Energy Carolinas and Duke Energy Progress
DENR State Enforcement Actions
In the first quarter of 2013, environmental organizations sent notices of intent to sue to Duke Energy Carolinas and Duke Energy Progress related to alleged groundwater violations and Clean Water Act violations from coal ash basins at two of their coal-fired power plants in North Carolina. The North Carolina Department of Environment and Natural Resources (DENR) filed enforcement actions against Duke Energy Carolinas and Duke Energy Progress alleging violations of water discharge permits and North Carolina groundwater standards. The case against Duke Energy Carolinas was filed in Mecklenburg County Superior Court. The case against Duke Energy Progress was filed in Wake County Superior Court. The cases are being heard before a single judge.
On October 4, 2013, Duke Energy Carolinas, Duke Energy Progress and DENR negotiated a proposed consent order. The consent order would have assessed civil penalties and imposed a compliance schedule requiring Duke Energy Carolinas and Duke Energy Progress to undertake monitoring and data collection activities toward making appropriate corrective action to address any substantiated violations. In light of the release that occurred at Dan River on February 2, 2014, on March 21, 2014, DENR withdrew its support of the consent orders and requested that the court proceed with the litigation.
On August 16, 2013, DENR filed an enforcement action against Duke Energy Carolinas and Duke Energy Progress related to their remaining plants in North Carolina, alleging violations of the Clean Water Act and violations of the North Carolina groundwater standards. The case against Duke Energy Carolinas was filed in Mecklenburg County Superior Court. The case against Duke Energy Progress was filed in Wake County Superior Court. Both of these cases have been assigned to the judge handling the enforcement actions discussed above. Southern Environmental Law Center (SELC), on behalf of several environmental groups, has been permitted to intervene in these cases.
It is not possible to predict any liability or estimate any damages Duke Energy Carolinas or Duke Energy Progress might incur in connection with these matters.
North Carolina Declaratory Judgment Action
On October 10, 2012, the SELC, on behalf of the same environmental groups that were permitted to challenge the consent decrees discussed above, filed a petition with the North Carolina Environmental Management Commission (EMC) asking for a declaratory ruling seeking to clarify the application of the state’s groundwater protection rules to coal ash basins. The petition sought to change the interpretation of regulations that permitted DENR to assess the extent, cause and significance of any groundwater contamination before ordering action to eliminate the source of contamination, among other issues. Duke Energy Carolinas and Duke Energy Progress were both permitted to intervene in the matter. On December 3, 2012, the EMC affirmed this interpretation of the regulations
On March 6, 2014, the North Carolina State Court judge overturned the ruling of the EMC holding that in the case of groundwater contamination, DENR was required to issue an order to immediately eliminate the source of the contamination before an assessment of the nature, significance and extent of the contamination or the continuing damage to the groundwater was conducted. Duke Energy Carolinas, Duke Energy Progress, and the EMC appealed the ruling in April 2014. On May 16, 2014, the North Carolina Court of Appeals denied a petition to stay the case during the appeal.
Federal Citizens Suits
On June 11, 2013, Catawba Riverkeeper Foundation, Inc. (Catawba Riverkeeper) filed a separate action in the United States Court for the Western District of North Carolina. The lawsuit contends the state enforcement action discussed above does not adequately address issues raised in Catawba Riverkeeper’s notice of intent to sue. On April 11, 2014, the Court denied Catawba Riverkeeper’s objections to the Magistrate Judge’s recommendation that plaintiff’s case be dismissed as well as Duke Energy Carolinas’ motion to dismiss. The Court allowed limited discovery, after which Duke Energy Carolinas may file any renewed motions to dismiss.
On September 12, 2013, Cape Fear River Watch, Inc., Sierra Club, and Waterkeeper Alliance filed a citizen suit in the Federal District Court for the Eastern District of North Carolina. The lawsuit alleges unpermitted discharges to surface water and groundwater violations. On June 9, 2014, the court granted Duke Energy Progress' request to dismiss the groundwater claims but rejected its request to dismiss the surface water claims.
On July 1, 2014, Duke Energy received 60-day notices of intent to file citizen suits from the SELC on behalf of many of the same environmental groups who intervened in the state enforcement litigation described above. The notices relate to alleged Clean Water Act violations at ash basins from Duke Energy Carolinas' Buck station and Duke Energy Progress' H.F. Lee and Cape Fear stations. It is not possible to predict whether Duke Energy Carolinas or Duke Energy Progress will incur any liability or to estimate the damages, if any, they might incur in connection with these matters.
Dan River Ash Basin Grand Jury Investigation
As a result of the Dan River ash basin water release discussed above, DENR issued a Notice of Violation and Recommendation of Assessment of Civil Penalties with respect to this matter on February 28, 2014, which the company responded to on March 13, 2014. Duke Energy and certain Duke Energy employees have received subpoenas issued by the United States Attorney for the Eastern District of North Carolina in connection with a criminal investigation related to the release and all fourteen of the North Carolina facilities with ash basins and the nature of Duke Energy's contacts with DENR with respect to those facilities. This is a multidistrict investigation that also involves state law enforcement authorities.
It is not possible to predict whether Duke Energy Carolinas or Duke Energy Progress will incur any liability or to estimate the damages, if any, they might incur in connection with these matters.
Duke Energy Carolinas
New Source Review
In 1999-2000, the U.S. Department of Justice (DOJ) on behalf of the EPA filed a number of complaints and notices of violation against multiple utilities, including Duke Energy Carolinas, for alleged violations of the New Source Review (NSR) provisions of the CAA. The government alleges the utilities violated the CAA by not obtaining permits for certain projects undertaken at certain coal plants or installing the best available emission controls for SO2, NOx and particulate matter. The complaints seek the installation of pollution control technology on various generating units that allegedly violated the CAA, and unspecified civil penalties in amounts of up to $37,500 per day for each violation. Duke Energy Carolinas asserts there were no CAA violations because the applicable regulations do not require permitting in cases where the projects undertaken are “routine” or otherwise do not result in a net increase in emissions.
In 2000, the government sued Duke Energy Carolinas in the U.S. District Court in Greensboro, North Carolina. The EPA claims 29 projects performed at 25 of Duke Energy Carolinas’ coal-fired units violate the NSR provisions. Duke Energy Carolinas asserts the projects were routine or not projected to increase emissions. The parties filed a stipulation in which the United States dismissed with prejudice 16 claims. In exchange, Duke Energy Carolinas dismissed certain affirmative defenses. The parties filed opposing motions for summary judgment on the remaining claims. In November 2013, the Court denied Duke Energy’s motion for summary judgment. On March 17, 2014, the court similarly denied plaintiffs’ motion for summary judgment, except to confirm that the baseline for measuring an emissions increase at trial will be the two-year period immediately preceding each project. Duke Energy requested leave to file another motion for summary judgment on alternative grounds. That motion for leave remains pending. The 13 remaining claims involve 13 different generating units, 11 of which have already been retired.
It is not possible to predict whether Duke Energy Carolinas will incur any liability or to estimate the damages, if any, it might incur in connection with this matter. Ultimate resolution of these matters could have a material effect on the results of operations, cash flows or financial position of Duke Energy Carolinas. However, the appropriate regulatory recovery will be pursued for costs incurred in connection with such resolution.
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, 2014, there were 90 asserted claims for non-malignant cases with the cumulative relief sought of up to $19 million, and 35 asserted claims for malignant cases with the cumulative relief sought of up to $12 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 $600 million at June 30, 2014 and $616 million at December 31, 2013. These reserves are classified in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities on the Condensed Consolidated Balance Sheets. These reserves are based upon the minimum amount of the range of loss for current and future asbestos claims through 2033, are recorded on an undiscounted basis and incorporate anticipated inflation. 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 2033 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 of $476 million. Duke Energy Carolinas’ cumulative payments began to exceed the self-insurance 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 $897 million in excess of the self-insured retention. Receivables for insurance recoveries were $649 million at both June 30, 2014 and December 31, 2013. These amounts are classified in Other within Investments and Other Assets and Receivables 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.
Progress Energy
Synthetic Fuels Matters
Progress Energy and a number of its subsidiaries and affiliates are defendants in lawsuits arising out of a 1999 Asset Purchase Agreement. Parties to the Asset Purchase Agreement include U.S. Global, LLC (Global) and affiliates of Progress Energy.
In a case filed in the Circuit Court for Broward County, Florida, in March 2003 (the Florida Global Case), Global requested an unspecified amount of compensatory damages, as well as declaratory relief. In November 2009, the court ruled in favor of Global. In December 2009, Progress Energy made a $154 million payment, which represented payment of the total judgment, including prejudgment interest, and a required premium equivalent to two years of interest, to the Broward County Clerk of Court bond account. Progress Energy continued to accrue interest related to this judgment.
On October 3, 2012, the Florida Fourth District Court of Appeals reversed the lower court ruling. The court held that Global was entitled to approximately $90 million of the amount paid into the registry of the court. Progress Energy was entitled to a refund of the remainder of the funds. Progress Energy received cash and recorded a $63 million pretax gain for the refund in December 2012. The gain was recorded in Income from Discontinued Operations, net of tax in the Condensed Consolidated Statements of Operations and Comprehensive Income.
On May 9, 2013, Global filed a Seventh Amended Complaint asserting a single count for breach of the Asset Purchase Agreement and seeking specific performance. The parties reached a settlement in this matter in May 2014, and the case has been dismissed. The amount of the settlement did not have a material effect on the results of operations, cash flows or financial position of Progress Energy. As a result of the settlement of the Florida Global Case, a second suit filed in the Superior Court for Wake County, North Carolina, Progress Synfuel Holdings, Inc. et al. v. U.S. Global, LLC, has been dismissed.
Duke Energy Progress and Duke Energy Florida
Spent Nuclear Fuel Matters
On December 12, 2011, Duke Energy Progress and Duke Energy Florida sued the United States in the U.S. Court of Federal Claims. The lawsuit claims the Department of Energy breached a contract in failing to accept spent nuclear fuel under the Nuclear Waste Policy Act of 1982 and asserts damages for the cost of on-site storage. Duke Energy Progress and Duke Energy Florida assert damages for the period January 1, 2006 through December 31, 2010. Claims for all periods prior to 2006 have been resolved. On March 24, 2014, the U.S. Court of Federal Claims issued a judgment in favor of Duke Energy Progress and Duke Energy Florida on this matter, awarding amounts of $83 million and $21 million, respectively. The majority of the awards were recorded as a reduction to capital costs associated with construction of on-site storage facilities. Receipt of the award is expected in the third quarter of 2014. Duke Energy Progress and Duke Energy Florida may file subsequent damage claims as they incur additional costs.
Duke Energy Florida
Westinghouse Contract Litigation
On March 28, 2014 Duke Energy Florida filed a lawsuit against Westinghouse Electric Company (Westinghouse) in the U.S. District Court for the Western District of North Carolina. The lawsuit seeks recovery of $54 million in milestone payments in excess of work performed under the terminated EPC agreement for Levy as well as a determination by the court of the amounts due to Westinghouse as a result of the termination of the EPC agreement. Duke Energy Florida terminated the EPC agreement on January 28, 2014. On March 31, 2014, Westinghouse filed a lawsuit against Duke Energy Florida in U.S. District Court for the Western District of Pennsylvania. The Pennsylvania lawsuit alleges damages under the EPC agreement in excess of $510 million for engineering and design work, costs to end supplier contracts and an alleged termination fee. On June 9, 2014, the judge in the North Carolina case ruled that the litigation will proceed in the Western District of North Carolina. It is not possible to predict whether Duke Energy Florida will incur any further liability for terminating the EPC agreement or to estimate the damages, if any, it might incur in connection with these matters. Ultimate resolution of these matters could have a material effect on the results of operations, financial position or cash flows of Duke Energy Florida. However, appropriate regulatory recovery will be pursued for the retail portion of any costs incurred in connection with such resolution.
Duke Energy Ohio
Antitrust Lawsuit
In January 2008, four plaintiffs, including individual, industrial and nonprofit customers, filed a lawsuit against Duke Energy Ohio in federal court in the Southern District of Ohio. Plaintiffs alleged Duke Energy Ohio conspired to provide inequitable and unfair price advantages for certain large business consumers by entering into non-public option agreements in exchange for their withdrawal of challenges to Duke Energy Ohio’s Rate Stabilization Plan (RSP) implemented in early 2005. In March 2014, a federal judge certified this matter as a class action. Trial has been set to begin on July 27, 2015. It is not possible to predict whether Duke Energy Ohio will incur any liability or to estimate the damages which may be incurred in connection with this lawsuit.
Duke Energy Indiana
Edwardsport IGCC
On December 11, 2012, Duke Energy Indiana filed an arbitration action against General Electric Company and Bechtel Corporation in connection with their work at the Edwardsport IGCC facility. Duke Energy Indiana is seeking damages of not less than $560 million. An arbitration hearing is scheduled for October 2014. 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 discussed above, excluding asbestos related reserves. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities. The reasonably possible range of loss for all non-asbestos related matters in excess of recorded reserves is not material.
(in millions)	June 30, 2014			December 31, 2013
Reserves for Legal Matters
Duke Energy	$	197		$	204
Progress Energy	73			78
Duke Energy Progress	10			10
Duke Energy Florida	42			43
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 unlimited 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, non-cancelable commitments to purchase or sell power, 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 normal purchase/normal sale (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.

Debt_and_Credit_Facilities

Debt and Credit Facilities	6 Months Ended
	Jun. 30, 2014
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, 2014
	Issuance Date	Maturity Date		Interest Rate			Duke Energy (Parent)			Duke Energy Progress			Duke Energy Florida			Duke Energy
	Unsecured Debt
	April 2014(a)	Apr-24		3.75	%		$	600		$	—		$	—		$	600
	April 2014(a)	Apr-17		0.61	%		400			—			—			400
	June 2014(b)	May-19		10.7	%		—			—			—			108
	June 2014(b)	May-21		13.9	%		—			—			—			110
	Secured Debt
	March 2014(c)	Mar-17		0.854	%		—			—			225			225
	First Mortgage Bonds
	March 2014(d)	Mar-44		4.375	%		—			400			—			400
	March 2014(d)	Mar-17		0.43	%		—			250			—			250
	Total issuances						$	1,000		$	650		$	225		$	2,093
	(a)	Proceeds were used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes. See Note 8 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.
	(b)	Proceeds will be used to repay $196 million of current maturities for International Energy and for general corporate purposes.
	(c)	Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Florida. Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes. See Note 12 for further details.
	(d)	Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.
	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, 2014
	Unsecured Debt
	Duke Energy (Parent)	Sep-14		3.95	%		$	500
	Duke Energy (Parent)	Apr-15		3.35	%		450
	Duke Energy	Jul-14		15.37	%		196
	First Mortgage Bonds
	Duke Energy Ohio	Mar-15		0.37	%		150
	Duke Energy Progress	Apr-15		5.15	%		300
	Other						291
	Current maturities of long-term debt						$	1,887
	MASTER CREDIT FACILITY
	Duke Energy has a master credit facility with a capacity of $6 billion through December 2018. The Subsidiary Registrants, excluding Progress Energy each have borrowing capacity under the master credit facility up to specified sublimits 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 the master credit facility.
		June 30, 2014
	(in millions)	Duke Energy				Duke Energy (Parent)			Duke Energy Carolinas			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Facility size(a)	$	6,000			$	2,250		$	1,000		$	750		$	650		$	650		$	700
	Reduction to backstop issuances
	Notes payable and commercial paper(b)	(1,409		)		(873		)	(300		)	(75		)	—			(11		)	(150		)
	Outstanding letters of credit	(64		)		(57		)	(4		)	(2		)	(1		)	—			—
	Tax-exempt bonds	(156		)		—			(75		)	—			—			—			(81		)
	Available capacity	$	4,371			$	1,320		$	621		$	673		$	649		$	639		$	469
	(a)	Represents the sublimit of each borrower at June 30, 2014.
	(b)	Duke Energy issued $450 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas and Duke Energy Indiana. The balances are classified within Long-term Debt in Duke Energy Carolinas' and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	GOODWILL
	The following tables present goodwill by reportable operating segment for Duke Energy and Duke Energy Ohio.
	Duke Energy
	(in millions)	Regulated Utilities			International Energy			Commercial Power			Total
	Balance at December 31, 2013
	Goodwill	$	15,950		$	326		$	935		$	17,211
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at December 31, 2013, as adjusted for accumulated impairment charges	15,950			326			64			16,340
	Foreign exchange and other changes	—			3			—			3
	Balance at June 30, 2014
	Goodwill	15,950			329			935			17,214
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at June 30, 2014, as adjusted for accumulated impairment charges	$	15,950		$	329		$	64		$	16,343
	Duke Energy Ohio
	(in millions)	Regulated Utilities			Commercial Power			Total
	Balance at December 31, 2013
	Goodwill	$	1,136		$	1,188		$	2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at December 31, 2013, as adjusted for accumulated impairment charges	920			—			920
	Balance at June 30, 2014
	Goodwill	1,136			1,188			2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at June 30, 2014, as adjusted for accumulated impairment charges	$	920		$	—		$	920
	Progress Energy
	Progress Energy's Goodwill is included in the Regulated Utilities operating segment and there are no accumulated impairment charges.

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	RELATED PARTY TRANSACTIONS
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
	In addition to the amounts presented above, the Subsidiary Registrants record the impact on net income of other affiliate transactions, including rental of office space, participation in a money pool arrangement, other operational transactions and their proportionate share of certain charged expenses. See Note 6 to the Consolidated Financial Statements in the Annual Report on Form 10-K for more information regarding money pool. The net impact of these transactions was not material for the three and six months ended June 30, 2014 and 2013 for the Subsidiary Registrants.
	See Note 12 for information relative to sale of receivables to an affiliate consolidated by Duke Energy.
	Duke Energy Commercial Asset Management (DECAM) is a nonregulated, direct subsidiary of Duke Energy Ohio. DECAM conducts business activities, including the execution of commodity transactions, third-party vendor and supply contracts, and service contracts for certain of Duke Energy’s nonregulated entities. The commodity contracts DECAM enters are accounted for as undesignated contracts or NPNS. Consequently, mark-to-market impacts of intercompany contracts with, and sales of power to, nonregulated entities are reflected in Duke Energy Ohio’s Condensed Consolidated Statements of Operations and Comprehensive Income. These amounts totaled net expense of $81 million and $6 million for the six months ended June 30, 2014 and 2013, respectively. Also, the amounts totaled net expense of $27 million and net revenue of $12 million for three months ended June 30, 2014 and 2013, respectively.
	Because it is not a rated entity, DECAM receives its credit support from Duke Energy or its nonregulated subsidiaries and not the regulated utility operations of Duke Energy Ohio. DECAM meets its funding needs through an intercompany loan agreement from a subsidiary of Duke Energy. DECAM also has the ability to loan money to the subsidiary of Duke Energy. DECAM had an outstanding intercompany loan payable of $802 million and $43 million, respectively, as of June 30, 2014 and December 31, 2013. These amounts are recorded in Notes payable to affiliated companies on Duke Energy Ohio’s Condensed Consolidated Balance Sheets.
	As discussed in Note 6, in April 2014, Duke Energy issued $1 billion of senior unsecured notes. Proceeds from the issuances were used in part to loan approximately $400 million to DECAM, and such funds were ultimately used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio. This transaction substantially completes the restructuring of Duke Energy Ohio’s capital structure to reflect appropriate debt and equity ratios for its regulated operations. The restructuring was completed in the second quarter of 2014, and resulted in the transfer of all of Duke Energy Ohio’s nonregulated generation assets, excluding Beckjord, out of its regulated public utility subsidiary.

Derivatives_and_Hedging

Derivatives and Hedging	6 Months Ended
	Jun. 30, 2014
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 and interest rate risks. The primary use of energy commodity derivatives is to hedge the generation portfolio against changes in the prices of electricity and natural gas. Interest rate swaps 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 agreement is offset against the collateralized derivatives on the balance sheet.
	Changes in the fair value of derivative agreements that either do not qualify for or have not been designated as hedges are reflected in current earnings or as regulatory assets or liabilities.
	COMMODITY PRICE RISK
	The Duke Energy Registrants are exposed to the impact of changes in the future prices of electricity, coal, and natural gas. Exposure to commodity price risk is influenced by a number of factors including the term of contracts, the liquidity of markets, and delivery locations.
	Commodity Fair Value and Cash Flow Hedges
	At June 30, 2014, there were no open commodity derivative instruments designated as hedges.
	Undesignated Contracts
	Undesignated contracts may include contracts not designated as a hedge, contracts that do not qualify for hedge accounting, derivatives that do not or no longer qualify for the NPNS scope exception, and de-designated hedge contracts. These contracts expire as late as 2018.
	Duke Energy Carolinas’ undesignated contracts are primarily associated with forward sales and purchases of electricity. Duke Energy Progress’ and Duke Energy Florida’s undesignated contracts are primarily associated with forward purchases of natural gas. Duke Energy Ohio’s undesignated contracts are primarily associated with forward sales and purchases of electricity, coal, and natural gas. Duke Energy Indiana’s undesignated contracts are primarily associated with forward purchases and sales of electricity and financial transmission rights.
	Volumes
	The tables below show information relating to volumes of outstanding commodity derivatives. Amounts disclosed represent the notional volumes of commodity contracts excluding NPNS. Amounts disclosed represent the absolute value of notional amounts. 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, 2014
		Duke Energy			Duke Energy Carolinas			Progress Energy		Duke Energy Progress		Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Electricity (gigawatt-hours)(a)	41,147			284			74		74		—			37,608			291
	Natural gas (millions of decatherms)	683			—			323		109		214			360			—
		December 31, 2013
		Duke Energy			Duke Energy Carolinas			Progress Energy		Duke Energy Progress		Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Electricity (gigawatt-hours)(a)	71,466			1,205			925		925		—			69,362			203
	Natural gas (millions of decatherms)	636			—			363		141		222			274			—
	(a)	Amounts at Duke Energy Ohio include intercompany positions that eliminate at Duke Energy.
	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 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. Pretax gains or losses recognized from inception to termination of the hedges are amortized as a component of interest expense over the life of the debt.
	Duke Energy has a combination foreign exchange, pay fixed-receive floating interest rate swap to fix the US dollar equivalent payments on a floating-rate Chilean debt issue.
	The following tables show notional amounts for derivatives related to interest rate risk.
		June 30, 2014							December 31, 2013
	(in millions)	Duke				Duke			Duke			Duke
		Energy				Energy			Energy			Energy
						Ohio						Ohio
	Cash flow hedges(a)	$	764			$	—		$	798		$	—
	Undesignated contracts	27				27			34			27
	Total notional amount	$	791			$	27		$	832		$	27
	(a)	Duke Energy includes amounts related to consolidated VIEs of $552 million at June 30, 2014 and $584 million at December 31, 2013.
	DUKE ENERGY
	The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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.
		June 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Designated as Hedging Instruments
	Commodity contracts
	Current Liabilities: Other	$	—			$	1		$	—		$	1
	Interest rate contracts
	Investments and Other Assets: Other	16				—			27			—
	Current Liabilities: Other	—				15			—			18
	Deferred Credits and Other Liabilities: Other	—				19			—			4
	Total Derivatives Designated as Hedging Instruments	16				35			27			23
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	62				4			201			158
	Current Assets: Assets Held for Sale	12				3			—			—
	Investments and Other Assets: Other	11				1			215			131
	Investments and Other Assets: Assets Held for Sale	12				4			—			—
	Current Liabilities: Other	16				134			13			153
	Current Liabilities: Liabilities Associated with Assets Held for Sale	416				563			—			—
	Deferred Credits and Other Liabilities: Other	4				57			5			166
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	248				364			—			—
	Interest rate contracts
	Current Liabilities: Other	—				1			—			1
	Deferred Credits and Other Liabilities: Other	—				5			—			4
	Total Derivatives Not Designated as Hedging Instruments	781				1,136			434			613
	Total Derivatives	$	797			$	1,171		$	461		$	636
	The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
		June 30, 2014
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	506			$	282		$	715		$	442
Gross amounts offset	(504		)		(277		)	(576		)	(366		)
Net amount subject to master netting	2				5			139			76
Amounts not subject to master netting	—				9			6			8
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	14		$	145		$	84
	December 31, 2013
	Derivative Assets							Derivative Liabilities
(in millions)	Current(e)				Non-Current(f)			Current(g)			Non-Current(h)
Gross amounts recognized	$	214			$	233		$	322		$	299
Gross amounts offset	(179		)		(138		)	(192		)	(155		)
Net amounts subject to master netting	35				95			130			144
Amounts not subject to master netting	—				14			4			11
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	35			$	109		$	134		$	155
(a)	Included in Other and Assets Held for Sale within Current Assets on the Condensed Consolidated Balance Sheet.
(b)	Included in Other and Assets Held for Sale within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(c)	Included in Other and Liabilities Associated with Assets Held for Sale within Current Liabilities on the Condensed Consolidated Balance Sheet.
(d)	Included in Other and Liabilities Associated with Assets Held for Sale within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
(e)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
(f)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(g)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
(h)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
The following table shows the gains and losses recognized on cash flow hedges and the line items on the Condensed Consolidated Statements of Operations where such gains and losses are included when reclassified from AOCI. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Pretax Gains (Losses) Recorded in AOCI
Interest rate contracts	$	(11	)		$	58		$	(9	)	$	71
Commodity contracts	—				—			—			1
Total Pretax Gains (Losses) Recorded in AOCI	$	(11	)		$	58		$	(9	)	$	72
Location of Pretax Gains (Losses) Reclassified from AOCI into Earnings
Interest rate contracts
Interest expense	(4		)		—			(5		)	(1		)
Total Pretax Gains (Losses) Reclassified from AOCI into Earnings	$	(4	)		$	—		$	(5	)	$	(1	)
There was no hedge ineffectiveness during the three and six months ended June 30, 2014 and 2013, and no gains or losses were excluded from the assessment of hedge effectiveness during the same periods.
At June 30, 2014 and 2013, $57 million and $70 million, respectively, of pretax deferred net losses on interest rate cash flow hedges were included in AOCI. A $13 million pretax gain is expected to be recognized in earnings during the next 12 months as interest expense.
The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause. Amounts included in Regulatory Assets or Liabilities for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Revenue: Regulated electric	$	3			$	1		$	(1	)	$	7
Revenue: Nonregulated electric, natural gas and other	(221		)		74			(618		)	(8		)
Fuel used in electric generation and purchased power - regulated	(21		)		(37		)	(14		)	(89		)
Fuel used in electric generation and purchased power - nonregulated	(25		)		(11		)	113			(18		)
Interest rate contracts
Interest expense	(5		)		(5		)	(9		)	(9		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(269	)		$	22		$	(529	)	$	(117	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	1			$	(110	)	$	(1	)	$	(5	)
Regulatory liabilities	(28		)		9			(1		)	4
Interest rate contracts
Regulatory assets	12				26			16			39
Regulatory liabilities	28				—			28			—
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	13			$	(75	)	$	42		$	38
DUKE ENERGY CAROLINAS
The fair values of derivative instruments were not material for the periods presented in this quarterly report.
PROGRESS ENERGY
The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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.
	June 30, 2014							December 31, 2013
(in millions)	Asset				Liability			Asset			Liability
Derivatives Designated as Hedging Instruments
Commodity contracts
Current Liabilities: Other	$	—			$	—		$	—		$	1
Deferred Credits and Other Liabilities: Other	—				—			—			4
Total Derivatives Designated as Hedging Instruments	—				—			—			5
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	5				4			3			2
Investments and Other Assets: Other	2				1			2			1
Current Liabilities: Other	17				120			11			105
Deferred Credits and Other Liabilities: Other	4				47			4			91
Total Derivatives Not Designated as Hedging Instruments	28				172			20			199
Total Derivatives	$	28			$	172		$	20		$	204
The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
	June 30, 2014
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	21			$	7		$	125		$	47
Gross amounts offset	(20		)		(5		)	(21		)	(6		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	1			$	2		$	104		$	41
	December 31, 2013
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	15			$	5		$	107		$	93
Gross amounts offset	(13		)		(4		)	(17		)	(10		)
Net amounts subject to master netting	2				1			90			83
Amounts not subject to master netting	—				—			—			4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	1		$	90		$	87
(a)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
(b)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(c)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Gains and losses on cash flow hedges and reclassifications from AOCI were not material for the periods presented in this quarterly report.
At June 30, 2014 and 2013, $62 million and $63 million, respectively, of pretax deferred net losses on derivative instruments related to interest rate cash flow hedges were included as a component of AOCI.
The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains or losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause. Amounts included in Regulatory Assets or Liabilities for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Operating revenues	$	2			$	1		$	(1	)	$	7
Fuel used in electric generation and purchased power	(21		)		(37		)	(14		)	(89		)
Interest rate contracts
Interest expense	4				(5		)	—			(9		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(15	)		$	(41	)	$	(15	)	$	(91	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	2			$	(108	)	$	—		$	(3	)
Interest rate contracts
Regulatory assets	12				4			16			9
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	14			$	(104	)	$	16		$	6
DUKE ENERGY PROGRESS
The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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. Substantially all derivatives not designated as hedging instruments receive regulatory accounting treatment.
	June 30, 2014							31-Dec-13
(in millions)	Asset				Liability			Asset			Liability
Derivatives Designated as Hedging Instruments
Commodity contracts
Current Liabilities: Other	$	—			$	1		$	—		$	1
Total Derivatives Designated as Hedging Instruments	—				1			—			1
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	2				2			—			—
Investments and Other Assets: Other	1				—			2			1
Current Liabilities: Other	9				54			2			40
Deferred Credits and Other Liabilities: Other	1				17			2			29
Total Derivatives Not Designated as Hedging Instruments	13				73			6			70
Total Derivatives	$	13			$	74		$	6		$	71
The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
	June 30, 2014
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	11			$	2		$	57		$	17
Gross amounts offset	(11		)		(1		)	(11		)	(1		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	1		$	46		$	16
	December 31, 2013
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	3			$	3		$	41		$	30
Gross amounts offset	(3		)		(3		)	(3		)	(3		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	38		$	27
(a)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
(b)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(c)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Gain and losses on cash flow hedges and reclassifications from AOCI were not material for the periods presented in this quarterly report.
The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause. Amounts included in Regulatory Assets or Liabilities for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Operating revenues	$	2			$	1		$	(1	)	$	7
Fuel used in electric generation and purchased power	(16		)		(12		)	(9		)	(29		)
Interest rate contracts
Interest expense	3				(3		)	—			(6		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(11	)		$	(14	)	$	(10	)	$	(28	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	23			$	(43	)	$	40		$	(7	)
Interest rate contracts
Regulatory assets	(3		)		4			—			7
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	20			$	(39	)	$	40		$	—
DUKE ENERGY FLORIDA
The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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. Substantially all derivatives not designated as hedging instruments receive regulatory accounting treatment..
	June 30, 2014							December 31, 2013
(in millions)	Asset				Liability			Asset			Liability
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	$	2			$	2		$	3		$	2
Investments and Other Assets: Other	1				1			—			—
Current Liabilities: Other	9				66			9			64
Deferred Credits and Other Liabilities: Other	3				29			2			63
Total Derivatives	$	15			$	98		$	14		$	129
The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
	June 30, 2014
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	10			$	5		$	68		$	30
Gross amounts offset	(9		)		(4		)	(10		)	(5		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	1			$	1		$	58		$	25
	December 31, 2013
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	12			$	2		$	66		$	63
Gross amounts offset	(10		)		(2		)	(15		)	(7		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	—		$	51		$	56
(a)	Included in Other within Current Assets on the Condensed Balance Sheet.
(b)	Included in Other within Investments and Other Assets on the Condensed Balance Sheet.
(c)	Included in Other within Current Liabilities on the Condensed Balance Sheet.
(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Balance Sheet.
Gains and losses on cash flow hedges and reclassifications from AOCI were not material for the periods presented in this quarterly report.
The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Operating revenues	$	—			$	—		$	—		$	—
Fuel used in electric generation and purchased power	(6		)		(25		)	(6		)	(60		)
Interest rate contracts
Interest expense	1				(1		)	—			(2		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(5	)		$	(26	)	$	(6	)	$	(62	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	(5	)		$	(66	)	$	(24	)	$	3
Interest rate contracts
Regulatory assets	(1		)		1			—			2
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(6	)		$	(65	)	$	(24	)	$	5
DUKE ENERGY OHIO
The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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.
	June 30, 2014							December 31, 2013
(in millions)	Asset				Liability			Asset			Liability
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	$	—			$	—		$	186		$	163
Current Assets: Assets Held for Sale	11				2			—			—
Investments and Other Assets: Other	—				—			202			130
Investments and Other Assets: Assets Held for Sale	10				3			—			—
Current Liabilities: Other	—				—			1			36
Current Liabilities: Liabilities Associated with Assets Held for Sale	502				634			—			—
Deferred Credits and Other Liabilities: Other	—				—			2			56
Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	318				472			—			—
Interest rate contracts
Current Liabilities: Other	—				1			—			1
Deferred Credits and Other Liabilities: Other	—				5			—			4
Total Derivatives Designated as Hedging Instruments	841				1,117			391			390
Total Derivatives	$	841			$	1,117		$	391		$	390
The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
	June 30, 2014
	Derivative Assets							Derivative Liabilities
(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
Gross amounts recognized	$	513			$	328		$	637		$	480
Gross amounts offset	(504		)		(322		)	(574		)	(410		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	9			$	6		$	63		$	70
	December 31, 2013
	Derivative Assets							Derivative Liabilities
(in millions)	Current(e)				Non-Current(f)			Current(g)			Non-Current(h)
Gross amounts recognized	$	186			$	205		$	199		$	186
Gross amounts offset	(165		)		(132		)	(173		)	(143		)
Net amounts subject to master netting	21				73			26			43
Amounts not subject to master netting	—				—			1			4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	21			$	73		$	27		$	47
(a)	Included in Assets Held for Sale within Current Assets on the Condensed Consolidated Balance Sheet.
(b)	Included in Assets Held for Sale within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(c)	Included in Liabilities Associated with Assets Held for Sale within Current Liabilities on the Condensed Consolidated Balance Sheet.
(d)	Included in Liabilities Associated with Assets Held for Sale within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
(e)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
(f)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(g)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
(h)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Gains and losses on cash flow hedges and reclassifications from AOCI were not material for the periods presented in this quarterly report.
The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported.
	Three Months Ended June 30,							Six Months Ended June 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Revenue, nonregulated electric, natural gas and other	$	(248	)		$	78		$	(697	)	$	(13	)
Fuel used in electric generation and purchased power	(25		)		(11		)	113			(18		)
Interest rate contracts
Interest expense	(1		)		(1		)	(1		)	(1		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(274	)		$	66		$	(585	)	$	(32	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	—			$	—		$	(1	)	$	—
Regulatory assets	(3		)		—			—			—
Interest rate contracts
Regulatory assets	—				2			—			3
Regulatory liabilities	6				—			6			—
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	3			$	2		$	5		$	3
DUKE ENERGY INDIANA
The fair values of derivative instruments were not material for the periods presented in this quarterly report.
CREDIT RISK
Certain derivative contracts contain contingent credit features. These features may include (i) material adverse change clauses or payment acceleration clauses that could result in immediate payments or (ii) the posting of letters of credit or termination of the derivative contract before maturity 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. Amounts for Duke Energy Carolinas and Duke Energy Indiana were not material.
	June 30, 2014
(in millions)	Duke				Progress Energy			Duke			Duke				Duke
	Energy							Energy			Energy				Energy
								Progress			Florida				Ohio
Aggregate fair value amounts of derivative instruments in a net liability position	$	911			$	13		$	4		$	9			$	911
Fair value of collateral already posted	276				2			—			2				266
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	76				11			4			7				80
	December 31, 2013
(in millions)	Duke				Progress Energy			Duke			Duke				Duke
	Energy							Energy			Energy				Energy
								Progress			Florida				Ohio
Aggregate fair value amounts of derivative instruments in a net liability position	$	525			$	168		$	60		$	108			$	355
Fair value of collateral already posted	135				10			—			10				125
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	205				158			60			98				47
The Duke Energy Registrants have elected to offset cash collateral and fair values of derivatives. For amounts to be netted, the derivative must be executed with the same counterparty under the same master netting agreement. Amounts disclosed below represent the receivables related to the right to reclaim cash collateral and payables related to the obligation to return cash collateral under master netting arrangements. Amounts for Duke Energy Carolinas and Duke Energy Indiana were not material.
	June 30, 2014							December 31, 2013
(in millions)	Receivables				Payables			Receivables			Payables
Duke Energy
Amounts offset against net derivative positions	$	161			$	—		$	30		$	—
Amounts not offset against net derivative positions	115				—			122			—
Progress Energy
Amounts offset against net derivative positions	2				—			10			—
Duke Energy Florida
Amounts offset against net derivative positions	2				—			10			—
Duke Energy Ohio
Amounts offset against net derivative positions	158				—			19			—
Amounts not offset against net derivative positions	108				—			115			—
Duke Energy Indiana
Amounts offset against net derivative positions	—				—			—			1
Amounts not offset against net derivative positions	—				—			1			—

Investments_in_Debt_and_Equity

Investments in Debt and Equity Securities	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investments In Debt And Equity Securities	'
	INVESTMENTS IN DEBT AND EQUITY SECURITIES
	The Duke Energy Registrants classify their investments in debt and equity securities as either trading or available-for-sale.
	TRADING SECURITIES
	Investments in debt and equity securities held in grantor trusts associated with certain deferred compensation plans and certain other investments are classified as trading securities. The fair value of these investments was $7 million at June 30, 2014 and $18 million at December 31, 2013.
	AVAILABLE-FOR-SALE SECURITIES
	All other investments in debt and equity securities are classified as available-for-sale securities.
	Duke Energy’s available-for-sale securities are primarily comprised of investments held in (i) the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, (ii) grantor trusts at Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana related to OPEB plans, (iii) Duke Energy’s captive insurance investment portfolio, and (iv) Duke Energy’s foreign operations investment portfolio.
	Duke Energy holds corporate debt securities that were purchased using excess cash from its foreign operations. These investments are either classified as Cash and cash equivalents or Short-term investments on the Condensed Consolidated Balance Sheet based on maturity date and are available for current operations of Duke Energy’s foreign business. The fair value of these investments classified as Short-term investments was $44 million as of December 31, 2013.
	Duke Energy classifies all other investments in debt and equity securities as long-term, unless otherwise noted.
	Investment Trusts
	The investments within the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida and the Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana grantor trusts (Investment Trusts) are managed by independent investment managers with discretion to buy, sell, and invest pursuant to the objectives set forth by the 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 gains and losses associated with debt and equity securities within the Investment Trusts are considered other-than-temporary impairments and are recognized immediately. Pursuant to regulatory accounting, substantially all realized and unrealized gains and losses associated with investments within the Investment Trusts are deferred as a regulatory asset or liability. As a result, there is no immediate impact on earnings of the Duke Energy Registrants.
	Other Available-for-Sale Securities
	Unrealized gains and losses on all other available-for-sale securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment is other-than-temporarily impaired. If an other-than-temporary impairment exists, the unrealized loss is included in earnings based on the criteria discussed below.
	The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value should be considered other-than-temporary. Criteria used to evaluate whether an impairment associated with equity securities is other-than-temporary includes, but is not limited to, (i) the length of time over which the market value has been lower than the cost basis of the investment, (ii) the percentage decline compared to the cost of the investment, and (iii) management’s intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in market value. If a decline in fair value is determined to be other-than-temporary, the investment is written down to its fair value through a charge to earnings.
	If the entity does not have an intent to sell a debt security and it is not more likely than not management will be required to sell the debt security before the recovery of its cost basis, the impairment write-down to fair value would be recorded as a component of other comprehensive income, except for when it is determined a credit loss exists. In determining whether a credit loss exists, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than the amortized cost basis, (ii) changes in the financial condition of the issuer of the security, or in the case of an asset backed security, the financial condition of the underlying loan obligors, (iii) consideration of underlying collateral and guarantees of amounts by government entities, (iv) ability of the issuer of the security to make scheduled interest or principal payments, and (v) any changes to the rating of the security by rating agencies. If a credit loss exists, the amount of impairment write-down to fair value is split between credit loss and other factors. The amount related to credit loss is recognized in earnings. The amount related to other factors is recognized in other comprehensive income. There were no credit losses as of June 30, 2014 and December 31, 2013. There were no other-than-temporary impairments for debt or equity securities as of June 30, 2014 and December 31, 2013.
	DUKE ENERGY
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	70	$	—	$	—	$	110
	Equity securities	2,007		14		3,873		1,813		10		3,579
	Corporate debt securities	17		2		492		8		6		400
	Municipal bonds	5		1		144		2		6		160
	U.S. government bonds	14		3		700		7		12		730
	Other debt securities	1		1		142		22		2		154
	Total NDTF	$	2,044	$	21	$	5,421	$	1,852	$	36	$	5,133
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	21
	Equity securities	34		—		97		29		—		91
	Corporate debt securities	2		—		66		1		1		99
	Municipal bonds	4		1		82		2		2		79
	U.S. government bonds	—		—		13		—		—		17
	Other debt securities	1		6		110		—		8		111
	Total Other Investments(a)	$	41	$	7	$	385	$	32	$	11	$	418
	Total Investments	$	2,085	$	28	$	5,806	$	1,884	$	47	$	5,551
	(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	57
	Due after one through five years	459
	Due after five through 10 years	440
	Due after 10 years	793
	Total	$	1,749
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	31	$	32	$	62	$	63
	Realized losses	2		15		6		22
	DUKE ENERGY CAROLINAS
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	33	$	—	$	—	$	42
	Equity securities	1,085		8		2,156		974		6		1,964
	Corporate debt securities	10		2		343		5		5		274
	Municipal bonds	1		—		36		—		2		54
	U.S. government bonds	5		1		306		3		7		354
	Other debt securities	—		1		125		22		2		146
	Total NDTF	$	1,101	$	12	$	2,999	$	1,004	$	22	$	2,834
	Other Investments
	Other debt securities	$	—	$	1	$	3	$	—	$	1	$	3
Total Other Investments(a)	$	—	$	1	$	3	$	—	$	1	$	3
Total Investments	$	1,101	$	13	$	3,002	$	1,004	$	23	$	2,837
(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
The table below summarizes the maturity date for debt securities.
(in millions)	June 30, 2014
Due in one year or less	$	24
Due after one through five years	182
Due after five through 10 years	243
Due after 10 years	364
Total	$	813
Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	29	$	21	$	52	$	46
Realized losses	1		6		2		10
PROGRESS ENERGY
The following table presents the estimated fair value investments in available-for-sale securities.
	June 30, 2014						December 31, 2013
(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
NDTF
Cash and cash equivalents	$	—	$	—	$	37	$	—	$	—	$	68
Equity securities	922		6		1,717		839		4		1,615
Corporate debt securities	7		—		149		3		1		126
Municipal bonds	4		1		108		2		4		106
U.S. government bonds	9		2		394		4		5		376
Other debt securities	1		—		17		—		—		8
Total NDTF	$	943	$	9	$	2,422	$	848	$	14	$	2,299
Other Investments
Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	20
Municipal bonds	3		—		41		1		—		39
Total Other Investments(a)	$	3	$	—	$	58	$	1	$	—	$	59
Total Investments	$	946	$	9	$	2,480	$	849	$	14	$	2,358
(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
The table below summarizes the maturity date for debt securities.
(in millions)	June 30, 2014
Due in one year or less	$	24
Due after one through five years	217
Due after five through 10 years	141
Due after 10 years	327
Total	$	709
Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	2	$	10	$	9	$	15
Realized losses	1		7		3		9
DUKE ENERGY PROGRESS
The following table presents the estimated fair value of investments in available-for-sale securities.
	June 30, 2014						December 31, 2013
(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
NDTF
Cash and cash equivalents	$	—	$	—	$	27	$	—	$	—	$	48
Equity securities	590		4		1,139		535		3		1,069
Corporate debt securities	5		—		94		3		1		80
Municipal bonds	4		1		106		2		4		104
U.S. government bonds	7		2		256		4		3		232
Other debt securities	1		—		10		—		—		5
Total NDTF	$	607	$	7	$	1,632	$	544	$	11	$	1,538
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	2
Total Other Investments(a)	$	—	$	—	$	2	$	—	$	—	$	2
Total Investments	$	607	$	7	$	1,634	$	544	$	11	$	1,540
(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
The table below summarizes the maturity date for debt securities.
(in millions)	June 30, 2014
Due in one year or less	$	15
Due after one through five years	141
Due after five through 10 years	90
Due after 10 years	220
Total	$	466
Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	1	$	6	$	7	$	8
Realized losses	—		3		2		4
DUKE ENERGY FLORIDA
The following table presents the estimated fair value of investments in available-for-sale securities.
	June 30, 2014						December 31, 2013
(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
NDTF
Cash and cash equivalents	$	—	$	—	$	10	$	—	$	—	$	20
Equity securities	332		2		578		304		1		546
Corporate debt securities	2		—		55		—		—		46
Municipal bonds	—		—		2		—		—		2
U.S. government bonds	2		—		138		—		2		144
Other debt securities	—		—		7		—		—		3
Total NDTF	$	336	$	2	$	790	$	304	$	3	$	761
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	3
Municipal bonds	3		—		41		1		—		39
Total Other Investments(a)	$	3	$	—	$	43	$	1	$	—	$	42
Total Investments	$	339	$	2	$	833	$	305	$	3	$	803
(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
The table below summarizes the maturity date for debt securities.
(in millions)	June 30, 2014
Due in one year or less	$	9
Due after one through five years	76
Due after five through 10 years	51
Due after 10 years	107
Total	$	243
Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	1	$	5	$	2	$	8
Realized losses	—		3		1		4
DUKE ENERGY INDIANA
The following table presents the estimated fair value of investments in available-for-sale securities.
	June 30, 2014						December 31, 2013
(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Equity securities	27		—		69		24		—		65
Municipal bonds	—		1		30		—		1		28
Total Other Investments(a)	$	27	$	1	$	100	$	24	$	1	$	94
Total Investments	$	27	$	1	$	100	$	24	$	1	$	94
(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
The table below summarizes the maturity date for debt securities.
(in millions)	June 30, 2014
Due in one year or less	$	1
Due after one through five years	19
Due after five through 10 years	7
Due after 10 years	3
Total	$	30
Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were insignificant for the three and six months ended June 30, 2014 and 2013.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
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:
	Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date. An active market is one in which transactions for an asset or liability occur with sufficient frequency and volume to provide ongoing pricing information.
	Level 2 – A fair value measurement utilizing inputs other than quoted prices included in Level 1 that are observable, either directly or indirectly, for an asset or liability. Inputs include (i) quoted prices for similar assets or liabilities in active markets, (ii) quoted prices for identical or similar assets or liabilities in markets that are not active, (iii) and inputs other than quoted market prices that are observable for the asset or liability, such as interest rate curves and yield curves observable at commonly quoted intervals, volatilities, and credit spreads. A Level 2 measurement cannot have more than an insignificant portion of its valuation based on unobservable inputs. Instruments in this category include non-exchange-traded derivatives, such as over-the-counter forwards, swaps and options; certain marketable debt securities; and financial instruments traded in less than active markets.
	Level 3 – Any fair value measurement which includes unobservable inputs for more than an insignificant portion of the valuation. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value. Level 3 measurements may include longer-term instruments that extend into periods in which observable inputs are not available.
	The 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.
	Transfers between levels represent assets or liabilities that were previously (i) categorized at a higher level for which the inputs to the estimate became less observable or (ii) classified at a lower level for which the inputs became more observable during the period. The Duke Energy Registrant’s policy is to recognize transfers between levels of the fair value hierarchy at the end of the period. There were no transfers between levels 1 and 2 during the three and six months ended June 30, 2014 and 2013. Transfers out of Level 3 during the three and six months ended June 30, 2014 are the result of forward commodity prices becoming observable due to the passage of time.
	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 NASDAQ and NYSE. 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 equity securities that are Level 2 or 3 are typically ownership interests in commingled investment funds.
	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. Other commodity derivatives are primarily fair valued using internally developed discounted cash flow models which incorporate forward price, adjustments for liquidity (bid-ask spread) and credit or non-performance risk (after reflecting credit enhancements such as collateral), and are discounted to present value. Pricing inputs are derived from published exchange transaction prices and other observable data sources. In the absence of an active market, the last available price may be used. 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 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 fair value of 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 which 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.
	Goodwill and Long-lived Assets
	See Note 7 for a discussion of the valuation of goodwill and long-lived 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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,873			$	3,703			$	2			$	168
	Nuclear decommissioning trust fund debt securities	1,548				374				1,174				—
	Other trading and available-for-sale equity securities	98				98				—				—
	Other trading and available-for-sale debt securities	294				28				246				20
	Derivative assets	133				8				66				59
	Total assets	5,946				4,211				1,488				247
	Derivative liabilities	(507		)		(150		)		(320		)		(37		)
	Net assets	$	5,439			$	4,061			$	1,168			$	210
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,579			$	3,495			$	57			$	27
	Nuclear decommissioning trust fund debt securities	1,553				402				1,100				51
	Other trading and available-for-sale equity securities	102				91				11				—
	Other trading and available-for-sale debt securities	333				36				277				20
	Derivative assets	145				33				70				42
	Total assets	5,712				4,057				1,515				140
	Derivative liabilities	(321		)		11				(303		)		(29		)
	Net assets	$	5,391			$	4,068			$	1,212			$	111
	The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Amounts included in earnings for derivatives are primarily included in Operating Revenues.
		Three Months Ended June 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	99			$	(14	)		$	85
	Total pretax realized or unrealized gains (losses) included in earnings	—				(6		)		(6		)
	Purchases, sales, issuances and settlements:
	Purchases	15				51				66
	Sales	(1		)		—				(1		)
	Issuances	—				(1		)		(1		)
	Settlements	—				(6		)		(6		)
	Transfers out of Level 3 due to observability of inputs	68				2				70
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7				(4		)		3
	Balance at end of period	$	188			$	22			$	210
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(25	)		$	(25	)
		Three Months Ended June 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	98			$	(82	)		$	16
	Total pretax realized or unrealized gains (losses) included in earnings	—				(11		)		(11		)
	Total pretax gains included in other comprehensive income	(1		)		—				(1		)
	Purchases, sales, issuances and settlements:
	Purchases	3				21				24
Issuances	(3		)		—				(3		)
Settlements	(1		)		(9		)		(10		)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				(6		)		(5		)
Balance at end of period	$	97			$	(87	)		$	10
	Six Months Ended June 30, 2014
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	98			$	13			$	111
Total pretax realized or unrealized gains (losses) included in earnings	—				12				12
Purchases, sales, issuances and settlements:
Purchases	16				51				67
Sales	(2		)		—				(2		)
Issuances	—				(1		)		(1		)
Settlements	—				(45		)		(45		)
Transfers out of Level 3 due to observability of inputs	68				(3		)		65
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	8				(5		)		3
Balance at end of period	$	188			$	22			$	210
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(25	)		$	(25	)
	Six Months Ended June 30, 2013
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	98			$	(85	)		$	13
Total pretax realized or unrealized gains (losses) included in earnings	—				(21		)		(21		)
Total pretax gains included in other comprehensive income	(2		)		—				(2		)
Purchases, sales, issuances and settlements:
Purchases	3				21				24
Sales	(3		)		—				(3		)
Issuances	—				6				6
Settlements	(1		)		(2		)		(3		)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				(6		)		(4		)
Balance at end of period	$	97			$	(87	)		$	10
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. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
	June 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	2,156			$	1,986			$	2			$	168
Nuclear decommissioning trust fund debt securities	843				147				696				—
Other trading and available-for-sale debt securities	3				—				—				3
Total assets	3,002				2,133				698				171
Derivative liabilities	(3		)		—				—				(3		)
Net assets	$	2,999			$	2,133			$	698			$	168
	December 31, 2013
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,964			$	1,879			$	58			$	27
Nuclear decommissioning trust fund debt securities	870				168				651				51
Other trading and available-for-sale debt securities	3				—				—				3
Total assets	2,837				2,047				709				81
Derivative liabilities	(2		)		—				—				(2		)
Net assets	$	2,835			$	2,047			$	709			$	79
The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
	Three Months Ended June 30, 2014
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	82			$	(4	)		$	78
Purchases, sales, issuances and settlements:
Purchases	15				—				15
Sales	(1		)		—				(1		)
Settlements	—				1				1
Transfers out of Level 3 due to observability of inputs	68				—				68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7				—				7
Balance at end of period	$	171			$	(3	)		$	168
	Three Months Ended June 30, 2013
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	73			$	(5	)		$	68
Purchases, sales, issuances and settlements:
Purchases	3				—				3
Sales	(3		)		—				(3		)
Settlements	—				1				1
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				—				1
Balance at end of period	$	74			$	(4	)		$	70
	Six Months Ended June 30, 2014
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	81			$	(2	)		$	79
Purchases, sales, issuances and settlements:
Purchases	16				—				16
Sales	(2		)		—				(2		)
Settlements	—				(1		)		(1		)
Transfers out of Level 3 due to observability of inputs	68				—				68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	8				—				8
Balance at end of period	$	171			$	(3	)		$	168
	Six Months Ended June 30, 2013
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	72			$	(12	)		$	60
Purchases, sales, issuances and settlements:
Purchases	3				—				3
Sales	(3		)		—				(3		)
Settlements	—				8				8
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				—				2
Balance at end of period	$	74			$	(4	)		$	70
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. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
	June 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,717			$	1,717			$	—			$	—
Nuclear decommissioning trust fund debt securities	705				227				478				—
Other trading and available-for-sale debt securities	58				16				42				—
Derivative assets	3				—				3				—
Total assets	2,483				1,960				523				—
Derivative liabilities	(147		)		—				(147		)		—
Net assets	$	2,336			$	1,960			$	376			$	—
	December 31, 2013
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,615			$	1,615			$	—			$	—
Nuclear decommissioning trust fund debt securities	677				233				444				—
Other trading and available-for-sale debt securities	58				19				39				—
Derivative assets	3				—				3				—
Total assets	2,353				1,867				486				—
Derivative liabilities	(187		)		—				(187		)		—
Net assets	$	2,166			$	1,867			$	299			$	—
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)	2014				2013				2014				2013
Balance at beginning of period	$	(3	)		$	(31	)		$	—			$	(38	)
Total pretax realized or unrealized gains included in earnings	3				—				—				—
Purchases, sales, issuances and settlements:
Issuances	—				1				—				7
Transfers out of Level 3 due to observability of inputs	2				—				2				—
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(2		)		(5		)		(2		)		(4		)
Balance at end of period	$	—			$	(35	)		$	—			$	(35	)
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. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
	June 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,139			$	1,139			$	—			$	—
Nuclear decommissioning trust fund debt securities	493				149				344				—
Other trading and available-for-sale debt securities	2				2				—				—
Derivative assets	1				—				1				—
Total assets	1,635				1,290				345				—
Derivative liabilities	(62		)		—				(62		)		—
Net assets	$	1,573			$	1,290			$	283			$	—
	December 31, 2013
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,069			$	1,069			$	—			$	—
Nuclear decommissioning trust fund debt securities	470				137				333				—
Other trading and available-for-sale debt securities	3				3				—				—
Derivative assets	1				—				1				—
Total assets	1,543				1,209				334				—
Derivative liabilities	(66		)		—				(66		)		—
Net assets	$	1,477			$	1,209			$	268			$	—
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)	2014				2013				2014				2013
Balance at beginning of period	$	(3	)		$	(31	)		$	—			$	(38	)
Total pretax realized or unrealized gains included in earnings	3				—				—				—
Purchases, sales, issuances and settlements:
Issuances	—				1				—				7
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—				(5		)		—				(4		)
Balance at end of period	$	—			$	(35	)		$	—			$	(35	)
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. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
	June 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	578			$	578			$	—			$	—
Nuclear decommissioning trust fund debt securities and other	212				78				134				—
Other trading and available-for-sale debt securities and other	43				1				42				—
Derivative assets	2				—				2				—
Total assets	835				657				178				—
Derivative liabilities	(85		)		—				(85		)		—
Net assets	$	750			$	657			$	93			$	—
	31-Dec-13
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	546			$	546			$	—			$	—
Nuclear decommissioning trust fund debt securities and other	214				96				118				—
Other trading and available-for-sale debt securities and other	40				2				38				—
Derivative assets	1				—				1				—
Total assets	801				644				157				—
Derivative liabilities	(116		)		—				(116		)		—
Net assets	$	685			$	644			$	41			$	—
DUKE ENERGY OHIO
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 table below exclude cash collateral, which is disclosed in Note 9.
	June 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Derivative assets	$	18			$	—			$	11			$	7
Derivative liabilities	(294		)		(145		)		(114		)		(35		)
Net assets (liabilities)	$	(276	)		$	(145	)		$	(103	)		$	(28	)
	December 31, 2013
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Derivative assets	$	96			$	50			$	21			$	25
Derivative liabilities	(95		)		(1		)		(65		)		(29		)
Net assets (liabilities)	$	1			$	49			$	(44	)		$	(4	)
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)	2014				2013				2014				2013
Balance at beginning of period	$	(19	)		$	(5	)		$	(4	)		$	(6	)
Total pretax realized or unrealized gains (losses) included in earnings	(13		)		(14		)		(19		)		(10		)
Purchases, sales, issuances and settlements:
Purchases	1				1				1				1
Settlements	—				—				(4		)		(3		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				(1		)		2				(1		)
Transfers out of Level 3 due to observability of inputs	1				—				(4		)		—
Balance at end of period	$	(28	)		$	(19	)		$	(28	)		$	(19	)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at June 30, 2014									$	(27	)
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. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
	30-Jun-14
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Available-for-sale equity securities	$	70			$	70			$	—			$	—
Available-for-sale debt securities	30				—				30				—
Derivative assets	45				—				—				45
Net assets	$	145			$	70			$	30			$	45
	31-Dec-13
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Available-for-sale equity securities	$	65			$	65			$	—			$	—
Available-for-sale debt securities	29				—				29				—
Derivative assets	12				—				—				12
Net assets	$	106			$	65			$	29			$	12
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)	2014				2013				2014				2013
Balance at beginning of period	$	7			$	4			$	12			$	10
Total pretax realized or unrealized gains (losses) included in earnings	—				7				27				2
Purchases, sales, issuances and settlements:
Purchases	49				20				49				—
Sales	—				—				—				20
Settlements	(7		)		(13		)		(38		)		(13		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(4		)		—				(5		)		(1		)
Balance at end of period	$	45			$	18			$	45			$	18
QUANTITATIVE DISCLOSURES ABOUT UNOBSERVABLE INPUTS
The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
	30-Jun-14
Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
	(in millions)
Duke Energy
Natural gas contracts	$	(1	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	2.92		-	$	4.71
Financial transmission rights (FTRs)	45			RTO auction pricing	FTR price - per MWh	(4.53		)	-	60.9
Electricity contracts	(9		)	Discounted cash flow	Forward electricity curves - price per MWh	25.1			-	62.77
Commodity capacity option contracts	4			Discounted cash flow	Forward capacity option curves  - price per MW day	27.65			-	161.1
Reserves	(17		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	22
Duke Energy Carolinas
Electricity contracts	$	(3	)	Discounted cash flow	Forward electricity curves - price per MWh	36.37			-	62.54
Duke Energy Ohio
Electricity contracts	$	(13	)	Discounted cash flow	Forward electricity curves - price per MWh	25.55			-	65.42
Natural gas contracts	(1		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	2.92			-	4.71
Reserves	(14		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(28	)
Duke Energy Indiana
FTRs	$	45		RTO auction pricing	FTR price - per MWh	(4.53		)	-	60.9
	31-Dec-13
Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
	(in millions)
Duke Energy
Natural gas contracts	$	(2	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.07		-	$	5.37
FERC mitigation power sale agreements	(2		)	Discounted cash flow	Forward electricity curves - price per MWh	25.79			-	52.38
Financial transmission rights (FTRs)	12			RTO auction pricing	FTR price - per MWh	(0.30		)	-	13.8
Electricity contracts	23			Discounted cash flow	Forward electricity curves - price per MWh	20.77			-	58.9
Commodity capacity option contracts	4			Discounted cash flow	Forward capacity option curves  - price per MW day	30.4			-	165.1
Reserves	(22		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	13
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(2	)	Discounted cash flow	Forward electricity curves - price per MWh	25.79			-	52.38
Duke Energy Ohio
Electricity contracts	$	18		Discounted cash flow	Forward electricity curves - price per MWh	20.77			-	58.9
Natural gas contracts	(2		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	3.07			-	5.37
Reserves	(20		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(4	)
Duke Energy Indiana
FTRs	$	12		RTO auction pricing	FTR price - per MWh	(0.30		)	-	13.8
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, 2014							December 31, 2013
(in millions)	Book Value			Fair Value				Book Value			Fair Value
Duke Energy	$	40,593		$	44,558			$	40,256		$	42,592
Duke Energy Carolinas	8,435			9,510				8,436			9,123
Progress Energy	14,518			16,387				14,115			15,234
Duke Energy Progress	5,717			6,045				5,235			5,323
Duke Energy Florida	5,107			5,892				4,886			5,408
Duke Energy Ohio	1,784			1,983				2,188			2,237
Duke Energy Indiana	3,795			4,374				3,796			4,171
At both June 30, 2014 and December 31, 2013, the fair value of cash and cash equivalents, accounts and notes receivable, accounts payable, notes payable and commercial paper, and non-recourse notes payable of variable interest entities 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, 2014
Variable Interest Entities [Abstract]	'
Variable Interest Entities	'
	VARIABLE INTEREST ENTITIES
	A VIE is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity, and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in an entity’s assets or activities. A qualitative analysis of control determines the party that consolidates a VIE. This assessment is based on (i) what party has the power to direct the most significant activities of the VIE that impact its economic performance, and (ii) what party has rights to receive benefits or is obligated to absorb losses that are significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment.
	Other than the discussion below related to CRC, no financial support was provided to any of the consolidated VIEs during the six months ended June 30, 2014 and the year ended December 31, 2013, or is expected to be provided in the future, that was not previously contractually required.
	CONSOLIDATED VIEs
	The table below shows VIEs consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		June 30, 2014
		Duke Energy
		Duke Energy Carolinas				Duke Energy Progress				Duke Energy Florida
	(in millions)	DERF				DEPR				DEFR			CRC			Renewables			Other			Total
	ASSETS
	Current Assets
	Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	$	704			$	471			$	403		$	506		$	17		$	19		$	2,120
	Other	—				—				—			—			115			12			127
	Investments and Other Assets
	Other	—				—				—			—			30			39			69
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—				—				—			—			1,856			18			1,874
	Accumulated depreciation and amortization	—				—				—			—			(214		)	(5		)	(219		)
	Regulatory Assets and Deferred Debits
	Other	1				—				1			—			33			—			35
	Total assets	$	705			$	471			$	404		$	506		$	1,837		$	83		$	4,006
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—			$	—			$	—		$	—		$	3		$	—		$	3
	Taxes accrued	—				—				—			—			4			—			4
	Current maturities of long-term debt	—				—				—			—			64			16			80
	Other	—				—				—			—			17			11			28
	Long-term Debt(b)	400				300				225			325			863			26			2,139
	Deferred Credits and Other Liabilities
	Deferred income taxes	—				—				—			—			292			—			292
	Asset retirement obligations	—				—				—			—			30			—			30
	Other	—				—				—			—			33			9			42
	Total liabilities	$	400			$	300			$	225		$	325		$	1,306		$	62		$	2,618
	Net assets of consolidated variable interest entities	$	305			$	171			$	179		$	181		$	531		$	21		$	1,388
	(a)    Restricted as collateral for non-recourse debt of VIEs.
	(b)    Non-recourse to the general assets of the applicable registrant.
		December 31, 2013
		Duke Energy
		Duke Energy Carolinas				Duke Energy Progress
	(in millions)	DERF				DEPR				CRC			Renewables			Other			Total
	ASSETS
	Current Assets
	Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	$	673			$	416			$	595		$	18		$	17		$	1,719
	Other	—				—				—			89			12			101
	Investments and Other Assets
	Other	—				—				—			29			51			80
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—				—				—			1,662			18			1,680
	Accumulated depreciation and amortization	—				—				—			(170		)	(5		)	(175		)
	Regulatory Assets and Deferred Debits
	Other	1				1				—			34			—			36
	Total assets	$	674			$	417			$	595		$	1,662		$	93		$	3,441
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—			$	—			$	—		$	2		$	—		$	2
	Taxes accrued	—				—				—			10			—			10
	Current maturities of long-term debt	—				—				—			66			14			80
	Other	—				—				—			17			10			27
	Long-term Debt(b)	400				300				325			907			34			1,966
	Deferred Credits and Other Liabilities
	Deferred income taxes	—				—				—			290			—			290
	Asset retirement obligations	—				—				—			26			—			26
	Other	1				—				—			17			13			31
Total liabilities	$	401			$	300			$	325		$	1,335		$	71		$	2,432
Net assets of consolidated variable interest entities	$	273			$	117			$	270		$	327		$	22		$	1,009
(a)    Restricted as collateral for non-recourse debt of VIEs.
(b)    Non-recourse to the general assets of the applicable registrant.
These entities have no requirement to provide liquidity to purchase assets of, or guarantee performance of, these VIEs unless noted in the following paragraphs.
DERF
On a daily basis, Duke Energy Receivables Finance Company, LLC (DERF), a bankruptcy remote, special purpose subsidiary of Duke Energy Carolinas, buys certain accounts receivable arising from the sale of electricity and/or related services from Duke Energy Carolinas. DERF is a wholly owned limited liability company with a separate legal existence from its parent, and its assets are not generally available to creditors of Duke Energy Carolinas. DERF borrows $400 million under a credit facility to buy the receivables. Borrowing is limited to the amount of qualified receivables sold, which is expected to be in excess of the credit facility. The credit facility expires in October 2016 and is reflected on the Condensed Consolidated Balance Sheets as Long-term Debt. The secured credit facility was not structured to meet the criteria for sale accounting treatment under the accounting guidance for transfers and servicing of financial assets.
The most significant activity that impacts the economic performance of DERF is the decisions made to manage delinquent receivables. Duke Energy Carolinas consolidates DERF as it makes those decisions.
DEPR
On a daily basis, Duke Energy Progress Receivables Company, LLC (DEPR), a bankruptcy remote, special purpose subsidiary of Duke Energy Progress formed in 2013, buys certain accounts receivable arising from the sale of electricity and/or related services from Duke Energy Progress. DEPR is a wholly owned limited liability company with a separate legal existence from its parent, and its assets are not generally available to creditors of Duke Energy Progress. DEPR borrows $300 million under a credit facility to buy the receivables. Borrowing is limited to the amount of qualified receivables sold, which is expected to be in excess of the credit facility. The credit facility expires in December 2016 and is reflected on the Condensed Consolidated Balance Sheets as Long-term Debt. The secured credit facility was not structured to meet the criteria for sale accounting treatment under the accounting guidance for transfers and servicing of financial assets.
The most significant activity that impacts the economic performance of DEPR is the decisions made to manage delinquent receivables. Duke Energy Progress consolidates DEPR as it makes those decisions.
DEFR
On a daily basis, Duke Energy Florida Receivables Company, LLC (DEFR), a bankruptcy remote, special purpose subsidiary of Duke Energy Florida formed in 2014, buys certain accounts receivable arising from the sale of electricity and/or related services from Duke Energy Florida. DEFR is a wholly owned limited liability company with a separate legal existence from its parent, and its assets are not generally available to creditors of Duke Energy Florida. DEFR borrows $225 million under a credit facility to buy the receivables. Borrowing is limited to the amount of qualified receivables sold, which is expected to be in excess of the credit facility. The credit facility expires in March 2017 and is reflected on the Condensed Consolidated Balance Sheets as Long-term Debt. The secured credit facility was not structured to meet the criteria for sale accounting treatment under the accounting guidance for transfers and servicing of financial assets.
The most significant activity that impacts the economic performance of DEFR is the decisions made to manage delinquent receivables. Duke Energy Florida consolidates DEFR as it makes those decisions.
CRC
On a revolving basis, CRC buys certain accounts receivable arising from the sale of electricity and/or related services from Duke Energy Ohio and Duke Energy Indiana. Receivables sold are securitized by CRC through a facility managed by two unrelated third parties. The proceeds Duke Energy Ohio and Duke Energy Indiana receive from the sale of receivables to CRC are typically 75 percent cash and 25 percent in the form of a subordinated note from CRC. The subordinated note is a retained interest in the receivables sold. Cash collections from the receivables are the sole source of funds to satisfy the related debt obligation. Depending on experience with collections, additional equity infusions to CRC may be required by Duke Energy to maintain a minimum equity balance of $3 million. There were no infusions to CRC during the three or six months ended June 30, 2014 and 2013, respectively. Borrowings fluctuate based on the amount of receivables sold. The credit facility expires in November 2016.
The secured credit facility is reflected on the Condensed Consolidated Balance Sheets as Long-term Debt. CRC is considered a VIE because (i) equity capitalization is insufficient to support its operations, (ii) power to direct the most significant activities that impact economic performance of the entity are not performed by the equity holder, Cinergy, and (iii) deficiencies in net worth of CRC are not funded by Cinergy, but by Duke Energy. The most significant activity of CRC relates to the decisions made with respect to the management of delinquent receivables. Duke Energy consolidates CRC as it makes these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidate CRC.
Renewables
Certain of Duke Energy’s renewable energy facilities are VIEs due to power purchase agreements with terms that approximate the expected life of the projects. These fixed price agreements effectively transfer commodity price risk to the buyer of the power. Certain other 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. The most significant activities that impact the economic performance of these renewable energy facilities were decisions associated with siting, negotiating purchase power agreements, engineering, procurement and construction, and decisions associated with ongoing operations and maintenance-related activities. Duke Energy consolidates the entities as it makes all of these decisions.
NON-CONSOLIDATED VIEs
The tables below show VIEs not consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
	30-Jun-14
	Duke Energy											Duke Energy			Duke Energy
(in millions)	Renewables				Other				Total			Ohio			Indiana
Receivables	$	—			$	—			$	—		$	68		$	98
Investments in equity method unconsolidated affiliates	152				26				178			—			—
Investments and other assets	—				4				4			—			—
Total assets	$	152			$	30			$	182		$	68		$	98
Other current liabilities	$	—			$	3			$	3		$	—		$	—
Deferred credits and other liabilities	—				14				14			—			—
Total liabilities	$	—			$	17			$	17		$	—		$	—
Net assets (liabilities)	$	152			$	13			$	165		$	68		$	98
	31-Dec-13
	Duke Energy											Duke Energy Ohio			Duke Energy Indiana
(in millions)	Renewables				Other				Total
Receivables	$	—			$	—			$	—		$	114		$	143
Investments in equity method unconsolidated affiliates	153				60				213			—			—
Intangibles, net	—				96				96			96			—
Investments and other assets	—				4				4			—			—
Total assets	$	153			$	160			$	313		$	210		$	143
Other current liabilities	$	—			$	3			$	3		$	—		$	—
Deferred credits and other liabilities	—				15				15			—			—
Total liabilities	$	—			$	18			$	18		$	—		$	—
Net assets	$	153			$	142			$	295		$	210		$	143
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 power purchase agreement with OVEC, which is discussed below, and various guarantees, reflected in the table above as Deferred credits and other liabilities.
Renewables
Duke Energy has investments in various renewable energy project entities. Some of these entities are VIEs due to power purchase agreements with terms that approximate the expected life of the project. These fixed price agreements effectively transfer commodity price risk to the buyer of the power. 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
At December 31, 2013, the most significant of the Other non-consolidated VIEs is Duke Energy Ohio’s 9 percent ownership interest in OVEC. Through its ownership interest in OVEC, Duke Energy Ohio has a contractual arrangement to buy power from OVEC’s power plants through June 2040. Proceeds from the sale of power by OVEC to its power purchase agreement counterparties are designed to be sufficient to meet its operating expenses, fixed costs, debt amortization and interest expense, as well as earn a return on equity. Accordingly, the value of this contract is subject to variability due to fluctuations in power prices and changes in OVEC’s costs of business, including costs associated with its 2,256 MW of coal-fired generation capacity. The initial carrying value of this contract was recorded as an intangible asset when Duke Energy acquired Cinergy in April 2006. The OVEC amount was reclassified to Assets held for sale in conjunction with the planned disposition of the Midwest Generation business in the first quarter of 2014. In the second quarter of 2014, Duke Energy Ohio removed OVEC from the disposal group as it has requested cost-based recovery of OVEC in its 2014 Electric Security Plan (ESP) application.
CRC
See discussion under Consolidated VIEs for additional information related to CRC.
Amounts included in Receivables 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 and are classified within Receivables in their Condensed Consolidated Balance Sheets. Carrying values of retained interests are determined by allocating carrying value of the receivables between assets sold and interests retained based on relative fair value. The allocated bases of the subordinated notes are not materially different than their face value because (i) the receivables generally turnover in less than two months, (ii) credit losses are reasonably predictable due to the broad customer base and lack of significant concentration, and (iii) the equity in CRC is subordinate to all retained interests and thus would absorb losses first. The hypothetical effect on fair value of the retained interests assuming both a 10 percent and a 20 percent unfavorable variation in credit losses or discount rates is not material due to the short turnover of receivables and historically low credit loss history. Interest accrues to Duke Energy Ohio and Duke Energy Indiana on the retained interests using the acceptable yield method. This method generally approximates the stated rate on the notes since the allocated basis and the face value are nearly equivalent. An impairment charge is recorded against the carrying value of both retained interests and purchased beneficial interest whenever it is determined that an other-than-temporary impairment has occurred.
Key assumptions used in estimating fair value are detailed in the following table.
	Duke Energy Ohio						Duke Energy Indiana
	2014			2013			2014			2013
Anticipated credit loss ratio	0.6	%		0.6	%		0.3	%		0.3	%
Discount rate	1.2	%		1.2	%		1.2	%		1.2	%
Receivable turnover rate	12.8	%		12.8	%		10.5	%		10.3	%
The following table shows the gross and net receivables sold.
	Duke Energy Ohio								Duke Energy Indiana
(in millions)	June 30, 2014				December 31, 2013				June 30, 2014			December 31, 2013
Receivables sold	$	236			$	290			$	311		$	340
Less: Retained interests	68				114				98			143
Net receivables sold	$	168			$	176			$	213		$	197
The following tables show sales and cash flows related to receivables sold.
	Duke Energy Ohio														Duke Energy Indiana
	Three Months Ended June 30,								Six Months Ended June 30,						Three Months Ended June 30,						Six Months Ended June 30,
(in millions)	2014				2013				2014			2013			2014			2013			2014			2013
Sales
Receivables sold	$	487			$	512			$	1,228		$	1,150		$	679		$	702		$	1,434		$	1,449
Loss recognized on sale	(2		)		3				(6		)	6			(2		)	3			(5		)	6
Cash flows
Cash proceeds from receivables sold	544				539				1,267			1,156			713			721			1,474			1,446
Collection fees received	1				1				1			1			1			1			1			1
Return received on retained interests	1				2				3			3			1			1			3			3
Cash flows from sales of receivables are reflected within Operating Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.
Collection fees received in connection with servicing transferred accounts receivable are included in Operation, maintenance and other on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Operations and Comprehensive Income. The loss recognized on sales of receivables is calculated monthly by multiplying receivables sold during the month by the required discount. The required discount is derived monthly utilizing a three-year weighted average formula that considers charge-off history, late charge history, and turnover history on the sold receivables, as well as a component for the time value of money. The discount rate, or component for the time value of money, is calculated monthly by summing the prior month-end LIBOR plus a fixed rate of 1.00 percent.

Common_Stock

Common Stock	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Common Stock	'
	COMMON STOCK
	Basic Earnings Per Share (EPS) is computed by dividing net income attributable to Duke Energy common shareholders, 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 attributable to Duke Energy common shareholders, 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, phantom shares and stock-based performance unit awards, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common shares during the restricted stock unit’s vesting periods.
	The following table presents Duke Energy’s basic and diluted EPS calculations and reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding.
	(In millions, except per-share amounts)	Income		Average	EPS
				Shares
	Three Months Ended June 30, 2014
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	611	707	$	0.86
	Three Months Ended June 30, 2013
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	340	706	$	0.48
	(In millions, except per-share amounts)	Income		Average	EPS
				Shares
	Six Months Ended June 30, 2014
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	516	707	$	0.73
	Six Months Ended June 30, 2013
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	969	705	$	1.37
	Effect of dilutive securities:
	Stock options, performance and restricted shares	—		1
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	969	706	$	1.37
	As of June 30, 2014 and 2013, 2 million of stock options and performance and unvested stock awards were not included in the dilutive securities calculation in the above table because either the option exercise prices were greater than the average market price of the common shares during those periods, or performance measures related to the awards had not yet been met.
	For the three months ended June 30, 2014 and 2013, Duke Energy declared dividends of $0.78 per share and $1.545 per share, respectively. For the six months ended June 30, 2014 and 2013, Duke Energy declared dividends of $1.56 per share and $2.31 per share, respectively.

StockBased_Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	STOCK-BASED COMPENSATION
	For employee awards, equity classified stock-based compensation cost is measured at the service inception date or the grant date, based on the estimated achievement of certain performance metrics or the fair value of the award, and is recognized as expense or capitalized as a component of property, plant and equipment over the requisite service period.
	Duke Energy recorded pretax stock-based compensation expense as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Stock options	$	—	$	—	$	—	$	2
	Restricted stock unit awards	11		12		22		26
	Performance awards	5		7		10		18
	Total	$	16	$	19	$	32	$	46
	Tax benefit associated with stock-based compensation expense	$	6	$	8	$	12	$	18
	Stock-based compensation costs capitalized	1		1		2		2

Employee_Benefit_Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	EMPLOYEE BENEFIT PLANS
	DEFINED BENEFIT RETIREMENT PLANS
	Duke Energy maintains, and the Subsidiary Registrants participate in, qualified, non-contributory defined benefit retirement plans. The plans cover most U.S. employees using a cash balance formula. Under a cash balance formula, a plan participant accumulates a retirement benefit consisting of pay credits based upon a percentage of current eligible earnings based on age and/or years of service and interest credits. Certain employees are covered under plans that use a final average earnings formula. Under these average earnings formulas, a plan participant accumulates a retirement benefit equal to the sum of percentages of their (i) highest three-year or four-year average earnings, (ii) highest three-year or four-year average earnings in excess of covered compensation per year of participation (maximum of 35 years), and/or (iii) highest three-year or four-year average earnings times years of participation in excess of 35 years. Duke Energy also maintains, and the Subsidiary Registrants participate in, non-qualified, non-contributory defined benefit retirement plans which cover certain executives. As of January 1, 2014, the qualified and non-qualified non-contributory defined benefit plans are closed to new and rehired non-union and certain unionized employees.
	Duke Energy uses a December 31 measurement date for its defined benefit retirement plan assets and obligations.
	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. Duke Energy did not make any contributions to its qualified defined benefit retirement plans during the six months ended June 30, 2014 and 2013.
	Net periodic benefit costs disclosed in the tables below represent the cost of the respective benefit plan for the periods presented. However, portions of the net periodic benefit costs disclosed in the tables below have been capitalized as a component of property, plant and equipment. Amounts presented in the tables below for the Subsidiary Registrants represent the amounts of pension and other post-retirement benefit cost allocated by Duke Energy for employees of the Subsidiary Registrants. Additionally, the Subsidiary Registrants are allocated their proportionate share of pension and post-retirement benefit cost for employees of Duke Energy’s shared services affiliate that provide support to the Subsidiary Registrants. These allocated amounts are included in the governance and shared service costs discussed in Note 8.
	QUALIFIED PENSION PLANS
	The following tables include the components of net periodic pension costs for qualified pension plans.
		Three Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	34		$	11		$	10		$	5		$	5		$	1		$	2
	Interest cost on projected benefit obligation	86			21			28			14			15			5			8
	Expected return on plan assets	(127		)	(33		)	(43		)	(22		)	(22		)	(6		)	(11		)
	Amortization of actuarial loss	37			9			17			8			8			1			3
	Amortization of prior service credit	(3		)	(2		)	(1		)	(1		)	(1		)	—			—
	Other	1			—			—			1			1			—			—
	Net periodic pension costs	$	28		$	6		$	11		$	5		$	6		$	1		$	2
		Three Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	42		$	13		$	15		$	6		$	7		$	1		$	3
	Interest cost on projected benefit obligation	80			20			29			12			14			6			7
	Expected return on plan assets	(137		)	(37		)	(49		)	(24		)	(22		)	(7		)	(11		)
	Amortization of actuarial loss	61			15			25			12			13			3			5
	Amortization of prior service credit	(3		)	(1		)	(1		)	—			(1		)	—			—
	Other	1			—			—			—			—			—			—
	Net periodic pension costs	$	44		$	10		$	19		$	6		$	11		$	3		$	4
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	68		$	21		$	20		$	10		$	10		$	2		$	4
	Interest cost on projected benefit obligation	172			42			56			27			29			10			15
	Expected return on plan assets	(255		)	(66		)	(86		)	(43		)	(43		)	(13		)	(20		)
	Amortization of actuarial loss	74			18			34			16			16			2			6
	Amortization of prior service credit	(7		)	(4		)	(2		)	(1		)	(1		)	—			—
	Other	3			1			1			1			1			—			—
	Net periodic pension costs	$	55		$	12		$	23		$	10		$	12		$	1		$	5
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	84		$	25		$	30		$	11		$	15		$	3		$	6
	Interest cost on projected benefit obligation	160			40			58			25			27			11			14
	Expected return on plan assets	(274		)	(74		)	(99		)	(47		)	(44		)	(15		)	(22		)
	Amortization of actuarial loss	122			30			50			23			25			6			11
	Amortization of prior service credit	(6		)	(3		)	(2		)	—			(1		)	—			—
	Other	3			1			1			—			—			—			—
	Net periodic pension costs	$	89		$	19		$	38		$	12		$	22		$	5		$	9
	NON-QUALIFIED PENSION PLANS
	The following tables include the components of net periodic pension costs for non-qualified pension plans for registrants with non-qualified pension costs.
		Three Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	—		$	—
	Interest cost on projected benefit obligation	3			—			—			—			1
	Amortization of actuarial loss	1			—			1			—			—
	Net periodic pension costs	$	5		$	—		$	2		$	—		$	1
		Three Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	—		$	—		$	—
	Interest cost on projected benefit obligation	3			1			2			1			1
	Amortization of actuarial loss	1			—			1			—			—
	Net periodic pension costs	$	5		$	1		$	3		$	1		$	1
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	—		$	—
	Interest cost on projected benefit obligation	7			—			2			1			1
	Amortization of actuarial loss	1			—			1			—			—
Amortization of prior service credit	—			—			—			—			—
Net periodic pension costs	$	9		$	—		$	4		$	1		$	1
	Six Months Ended June 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
Service cost	$	1		$	—		$	—		$	—		$	—
Interest cost on projected benefit obligation	7			1			4			1			1
Amortization of actuarial loss	3			—			2			—			—
Amortization of prior service credit	(1		)	—			(1		)	—			—
Net periodic pension costs	$	10		$	1		$	5		$	1		$	1
OTHER POST-RETIREMENT BENEFIT PLANS
Duke Energy provides, and the Subsidiary Registrants participate in, some health care and life insurance benefits for retired employees on a contributory and non-contributory basis. Employees are eligible for these benefits if they have met age and service requirements at retirement, as defined in the plans. The health care benefits include medical, dental, and prescription drug coverage and are subject to certain limitations, such as deductibles and co-payments.
Duke Energy did not make any contributions to its other post-retirement benefit plans during the three and six months ended June 30, 2014 and 2013.
The following tables include the components of net periodic other post-retirement benefit costs.
	Three Months Ended June 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	3		$	1		$	1		$	1		$	1		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	13			3			5			2			3			1			2
Expected return on plan assets	(3		)	(2		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	10			—			11			8			3			(1		)	—
Amortization of prior service credit	(32		)	(2		)	(23		)	(18		)	(6		)	—			—
Net periodic other post-retirement benefit costs	$	(9	)	$	—		$	(6	)	$	(7	)	$	1		$	—		$	1
	Three Months Ended June 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	7		$	—		$	5		$	3		$	2		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	18			3			12			6			4			1			2
Expected return on plan assets	(4		)	(2		)	—			—			—			—			—
Amortization of actuarial loss (gain)	13			1			15			9			4			(1		)	—
Amortization of prior service credit	(3		)	(2		)	(1		)	(1		)	—			—			—
Net periodic other post-retirement benefit costs	$	31		$	—		$	31		$	17		$	10		$	—		$	2
	Six Months Ended June 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	5		$	1		$	2		$	1		$	2		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	25			6			11			5			6			1			3
Expected return on plan assets	(6		)	(4		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	20			1			21			15			5			(1		)	—
Amortization of prior service credit	(63		)	(5		)	(47		)	(36		)	(11		)	—			—
Net periodic other post-retirement benefit costs	$	(19	)	$	(1	)	$	(13	)	$	(15	)	$	2		$	—		$	2
	Six Months Ended June 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	14		$	1		$	11		$	6		$	4		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	36			6			23			12			8			1			3
Expected return on plan assets	(7		)	(5		)	—			—			—			—			—
Amortization of actuarial loss (gain)	26			2			29			18			8			(1		)	—
Amortization of prior service credit	(6		)	(4		)	(1		)	(1		)	—			—			—
Net periodic other post-retirement benefit costs	$	63		$	—		$	62		$	35		$	20		$	—		$	3
EMPLOYEE SAVINGS PLANS
Duke Energy sponsors and the Subsidiary Registrants participate in, employee savings plans that cover substantially all U.S. employees. Most employees participate in a matching contribution formula where Duke Energy provides a matching contribution generally equal to 100 percent of employee before-tax and Roth 401(k) contributions and, as applicable, after-tax contributions of up to 6 percent of eligible pay per pay period. Dividends on Duke Energy shares held by the savings plans are charged to retained earnings when declared and shares held in the plans are considered outstanding in the calculation of basic and diluted earnings per share.
As of January 1, 2014, for new and rehired non-union and certain unionized employees who are not eligible to participate in Duke Energy’s defined benefit plans, an additional employer contribution of 4 percent of eligible pay per pay period is provided to the employee’s savings plan account, which is subject to a three-year vesting schedule.
The following table includes pretax employer matching contributions, as well as the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan, made by Duke Energy and expensed by the Subsidiary Registrants.
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Three Months Ended June 30,
2014	$	36		$	12		$	11		$	7		$	3		$	1		$	2
2013	30			10			10			6			3			1			1
Six Months Ended June 30,
2014	$	80		$	26		$	23		$	16		$	7		$	2		$	4
2013	71			24			22			12			7			2			3

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	The effective tax rates for each of the Duke Energy Registrants are included in the following table.
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Duke Energy	25.4	%	32.5	%	13.6	%	33.6	%
	Duke Energy Carolinas	28.9	%	37.4	%	33.6	%	37.2	%
	Progress Energy	37.7	%	59.9	%	37.4	%	36.7	%
	Duke Energy Progress	37.3	%	39.6	%	36.9	%	38.7	%
	Duke Energy Florida	38.7	%	38	%	38.6	%	39.8	%
	Duke Energy Ohio	36.2	%	36.3	%	35.5	%	35.9	%
	Duke Energy Indiana	36.9	%	37.5	%	36.8	%	37.5	%
	The decrease in the effective tax rate for Duke Energy for the three and six months ended June 30, 2014 is primarily due to the first quarter of 2014 impairment of the Midwest Generation business and a deferred tax benefit recorded in the second quarter of 2014 as a result of the merger of two Chilean subsidiaries.
	The decrease in the effective tax rate for Duke Energy Carolinas for the three and six months ended June 30, 2014 is primarily due to favorable audit settlements and changes in apportionment related to state income tax.
	The decrease in the effective tax rate for Progress Energy for the three months ended June 30, 2014 is primarily due to the pretax loss in 2013 related to the 2013 FPSC settlement agreement.
	The decrease in the effective tax rate for Duke Energy Progress for the three and six months ended June 30, 2014 is primarily due to certain nondeductible book depreciation.
	The decrease in the effective tax rate for Duke Energy Florida for the six months ended June 30, 2014 is primarily due to certain nondeductible book depreciation.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	For information on subsequent events related to regulatory matters, commitments and contingencies, and debt and credit facilities see Notes 4, 5, and 6, respectively.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policy)	6 Months Ended
	Jun. 30, 2014
Policy Text Block [Line Items]	'
Nature of Operations and Basis of Consolidation	'
	NATURE OF OPERATIONS AND BASIS OF CONSOLIDATION
	Duke Energy Corporation (collectively with its subsidiaries, Duke Energy) is an energy company headquartered in Charlotte, North Carolina, subject to regulation by the Federal Energy Regulatory Commission (FERC). Duke Energy operates in the United States (U.S.) and Latin America primarily through its direct and indirect subsidiaries. Duke Energy’s subsidiaries include its subsidiary registrants, Duke Energy Carolinas, LLC (Duke Energy Carolinas); Progress Energy, Inc. (Progress Energy); Duke Energy Progress, Inc. (Duke Energy Progress); Duke Energy Florida, Inc. (Duke Energy Florida); Duke Energy Ohio, Inc. (Duke Energy Ohio) and Duke Energy Indiana, Inc. (Duke Energy Indiana). When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of its six separate subsidiary registrants (collectively referred to as the Subsidiary Registrants), which, along with Duke Energy, are collectively referred to as the Duke Energy Registrants.
	These Condensed Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries where the respective Duke Energy Registrants have control. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities.
	Duke Energy Carolinas is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the North Carolina Utilities Commission (NCUC), Public Service Commission of South Carolina (PSCSC), U.S. Nuclear Regulatory Commission (NRC) and FERC. Substantially all of Duke Energy Carolinas’ operations qualify for regulatory accounting.
	Progress Energy is a public utility holding company headquartered in Raleigh, North Carolina, subject to regulation by the FERC. Progress Energy conducts operations through its wholly owned subsidiaries, Duke Energy Progress and Duke Energy Florida. Substantially all of Progress Energy’s operations qualify for regulatory accounting.
	Duke Energy Progress is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Progress is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Substantially all of Duke Energy Progress’ operations qualify for regulatory accounting.
	Duke Energy Florida is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Florida. Duke Energy Florida is subject to the regulatory provisions of the Florida Public Service Commission (FPSC), NRC and FERC. Substantially all of Duke Energy Florida’s operations qualify for regulatory accounting.
	Duke Energy Ohio is a public utility that provides service in portions of Ohio and Kentucky. Operations in Kentucky are conducted through its wholly owned subsidiary, Duke Energy Kentucky, Inc. (Duke Energy Kentucky). Duke Energy Ohio’s principal lines of business include transmission and distribution of electricity and the sale of and/or transportation of natural gas. Duke Energy Ohio also generates and sells power into wholesale energy markets. Duke Energy Ohio conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers. Duke Energy Kentucky’s principal lines of business include generation, transmission and distribution of electricity, as well as the sale of and/or transportation of natural gas. References herein to Duke Energy Ohio include Duke Energy Ohio and its subsidiaries, unless otherwise noted. Duke Energy Ohio is subject to the regulatory provisions of the Public Utilities Commission of Ohio (PUCO), Kentucky Public Service Commission (KPSC) and FERC. Duke Energy Ohio applies regulatory accounting to a portion of its operations.
	Duke Energy Indiana is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Indiana. Duke Energy Indiana is subject to the regulatory provisions of the Indiana Utility Regulatory Commission (IURC) and the FERC. Substantially all of Duke Energy Indiana’s operations qualify for regulatory accounting.
	Certain prior year amounts have been reclassified to conform to the current year presentation.
Basis of Presentation	'
	BASIS OF PRESENTATION
	These Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. 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 in the U.S. for annual financial statements. Because the interim Condensed Consolidated Financial Statements and Notes do not include all information and notes required by GAAP in the U.S. for annual financial statements, the Condensed Consolidated Financial Statements and other information included in this quarterly report should be read in conjunction with the Consolidated Financial Statements and Notes in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2013.
	These Condensed Consolidated Financial Statements reflect all normal recurring adjustments in the opinion of the respective companies’ management, 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.
Unbilled Revenue	'
	UNBILLED REVENUE
	Revenues on sales of electricity and gas are recognized when service is provided. Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns and meter reading schedules.
	Unbilled revenues are included within Receivables and Restricted receivables of variable interest entities on the Condensed Consolidated Balance Sheets as shown in the following table.
Duke Energy Ohio [Member]	'
Policy Text Block [Line Items]	'
Unbilled Revenue	'
	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, Cinergy Receivables Company, LLC (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 12 for further information. These receivables for unbilled revenues are shown in the table below.
Duke Energy Indiana [Member]	'
Policy Text Block [Line Items]	'
Unbilled Revenue	'
	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, Cinergy Receivables Company, LLC (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 12 for further information. These receivables for unbilled revenues are shown in the table below.

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2014
Organization And Basis Of Presentation [Line Items]	'
Schedule Of Unbilled Revenues With Restricted Receivables	'
	Unbilled revenues are included within Receivables and Restricted receivables of variable interest entities on the Condensed Consolidated Balance Sheets as shown in the following table.
	(in millions)	June 30, 2014		December 31, 2013
	Duke Energy	$	884	$	937
	Duke Energy Carolinas	326		323
	Progress Energy	269		189
	Duke Energy Progress	157		120
	Duke Energy Florida	112		69
	Duke Energy Ohio	—		55
	Duke Energy Indiana	27		5
Schedule of Excise Taxes	'
	Excise taxes accounted for on a gross basis as operating revenues in the Condensed Consolidated Statements of Operations were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy	$	151	$	142	$	318	$	291
	Duke Energy Carolinas	43		37		89		78
	Progress Energy	74		73		151		141
	Duke Energy Progress	24		27		56		55
	Duke Energy Florida	50		46		95		86
	Duke Energy Ohio	25		24		59		55
	Duke Energy Indiana	9		8		19		17
Duke Energy Ohio [Member]	'
Organization And Basis Of Presentation [Line Items]	'
Schedule of Unbilled Revenues Sold to CRC	'
	These receivables for unbilled revenues are shown in the table below.
	(in millions)	June 30, 2014		December 31, 2013
	Duke Energy Ohio	$	64	$	89
	Duke Energy Indiana	102		144
Duke Energy Indiana [Member]	'
Organization And Basis Of Presentation [Line Items]	'
Schedule of Unbilled Revenues Sold to CRC	'
	These receivables for unbilled revenues are shown in the table below.
	(in millions)	June 30, 2014		December 31, 2013
	Duke Energy Ohio	$	64	$	89
	Duke Energy Indiana	102		144

Acquisitions_and_Dispositions_

Acquisitions and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Schedule of Plants in Disposal Group	'
	The following table presents information related to the Duke Energy Ohio generation plants included in the disposal group.
	Facility	Plant Type		Primary Fuel	Location		Total Average MW Capacity(c)	Owned Average MW Capacity(c)	Ownership Interest
	Stuart(a)(b)	Fossil Steam		Coal	OH		2,318	904	39	%
	Zimmer(a)	Fossil Steam		Coal	OH		1,338	622	46.5	%
	Hanging Rock	Combined Cycle		Gas	OH		1,274	1,274	100	%
	Miami Fort (Units 7 and 8)(a)	Fossil Steam		Coal	OH		1,020	653	64	%
	Conesville(a)(b)	Fossil Steam		Coal	OH		780	312	40	%
	Washington	Combined Cycle		Gas	OH		637	637	100	%
	Fayette	Combined Cycle		Gas	PA		640	640	100	%
	Killen(a)(b)	Fossil Steam		Coal	OH		618	204	33	%
	Lee	Combustion Turbine		Gas	IL		640	640	100	%
	Dick's Creek	Combustion Turbine		Gas	OH		136	136	100	%
	Miami Fort	Combustion Turbine		Oil	OH		68	68	100	%
	Total Midwest Generation						9,469	6,090
	(a)	Jointly owned with Ohio Power Company and/or The Dayton Power & Light Company.
	(b)	Station is not operated by Duke Energy Ohio.
	(c)	Average MW capacity is calculated as the average of winter capacity and summer capacity.
Held for sale	'
	The following table presents the carrying values of the major classes of Assets held for sale and Liabilities associated with assets held for sale included in the Midwest generation disposal group in the Condensed Consolidated Balance Sheets. Amounts included in the following table exclude certain other disposal groups which are not material and accordingly do not agree to amounts presented in the Duke Energy Condensed Consolidated Balance Sheets.
		June 30, 2014
	(in millions)	Duke Energy			Duke Energy Ohio
	Current assets	$	409		$	359
	Investments and other assets	42			37
	Property, plant and equipment	2,153			2,116
	Total assets held for sale	$	2,604		$	2,512
	Current liabilities	$	271		$	257
	Deferred credits and other liabilities	75			74
	Total liabilities associated with assets held for sale	$	346		$	331

Business_Segments_Tables

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting Information [Line Items]	'
Business Segment Data	'
	Duke Energy sold its interest in DukeNet Communications Holdings, LLC (DukeNet) to Time Warner Cable, Inc.
		Three Months Ended June 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	5,272		$	364		$	304		$	5,940		$	9		$	—		$	5,949
	Intersegment revenues	11			—			5			16			19			(35		)	—
	Total revenues	$	5,283		$	364		$	309		$	5,956		$	28		$	(35	)	$	5,949
	Segment income (loss)(a)(b)	$	689		$	146		$	(120	)	$	715		$	(103	)	$	—		$	612
	Add back noncontrolling interests component																			4
	Loss from discontinued operations, net of tax																			(3		)
	Net income																			$	613
	Segment assets	$	101,070		$	5,463		$	5,652		$	112,185		$	2,807		$	181		$	115,173
	(a)	Commercial Power includes a mark-to-market loss of $136 million, net of a tax benefit of $77 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Three Months Ended June 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)	$	4,911		$	406		$	547		$	5,864		$	15		$	—		$	5,879
	Intersegment revenues	9			—			10			19			21			(40		)	—
	Total revenues	$	4,920		$	406		$	557		$	5,883		$	36		$	(40	)	$	5,879
	Segment income (loss)(a)(b)(c)(d)(e)	$	353		$	87		$	41		$	481		$	(139	)	$	—		$	342
	Add back noncontrolling interests component																			3
	Loss from discontinued operations, net of tax																			(3		)
	Net income																			$	342
	(a)	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
	(b)	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates beginning in June 2013. This rate increase impacts Regulated Utilities.
	(c)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
	(d)	Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at the Shearon Harris Nuclear Station (Harris) site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
	(e)	Other includes costs to achieve the Progress Energy merger.
		Six Months Ended June 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	11,067		$	746		$	746		$	12,559		$	14		$	—		$	12,573
	Intersegment revenues	21			—			12			33			39			(72		)	—
	Total revenues	$	11,088		$	746		$	758		$	12,592		$	53		$	(72	)	$	12,573
	Segment income (loss)(a)(b)(c)	$	1,426		$	276		$	(999	)	$	703		$	(185	)	$	—		$	518
	Add back noncontrolling interests component																			8
	Loss from discontinued operations, net of tax																			(6		)
	Net income																			$	520
	(a)	Commercial Power includes an impairment charge related to the planned disposition of the Midwest Generation assets. See Note 2 for additional information.
	(b)	Commercial Power includes a mark-to-market loss of $158 million, net of a tax benefit of $89 million, on economic hedges of the input and output commodities related to its fossil generation assets.
	(c)	Other includes costs to achieve the Progress Energy merger.
		Six Months Ended June 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)	$	9,963		$	798		$	986		$	11,747		$	30		$	—		$	11,777
	Intersegment revenues	17			—			23			40			41			(81		)	—
	Total revenues	$	9,980		$	798		$	1,009		$	11,787		$	71		$	(81	)	$	11,777
	Segment income(a)(b)(c)(d)(e)	$	1,009		$	184		$	(1	)	$	1,192		$	(216	)	$	—		$	976
	Add back noncontrolling interest																			3
	Loss from discontinued operations, net of tax																			(3		)
	Net income																			$	976
	(a)	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
	(b)	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates in the first year beginning in June 2013. This rate increase impacts Regulated Utilities.
	(c)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
	(d)	Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at the Shearon Harris Nuclear Station (Harris) site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
	(e)	Other includes costs to achieve the Progress Energy merger.
Schedule of Net Loss for Other Segment	'
	The following table summarizes the net loss for Other at each of these registrants.
		Three Months Ended June 30,						Six Months Ended June 30,
	(in millions)	2014			2013			2014			2013
	Duke Energy Carolinas	$	(27	)	$	(25	)	$	(48	)	$	(43	)
	Progress Energy	(45		)	(55		)	(97		)	(133		)
	Duke Energy Progress	(3		)	(14		)	(13		)	(20		)
	Duke Energy Florida	(7		)	(7		)	(11		)	(12		)
	Duke Energy Indiana	(4		)	(4		)	(7		)	(8		)
Duke Energy Ohio [Member]	'
Segment Reporting Information [Line Items]	'
Business Segment Data	'
	All of Duke Energy Ohio’s revenues are generated domestically and its long-lived assets are all in the U.S.
		Three Months Ended June 30, 2014
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues(a)	$	415		$	116		$	531		$	—		$	—		$	531
	Intersegment revenues	—			5			5			—			(5		)	—
	Total revenues	$	415		$	121		$	536		$	—		$	(5	)	$	531
	Segment income (loss) / Consolidated net income(a)(b)	$	52		$	(154	)	$	(102	)	$	(5	)	$	—		$	(107	)
	Segment assets	$	7,203		$	2,818		$	10,021		$	103		$	(555	)	$	9,569
	(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
	(b)	Commercial Power includes an after-tax mark-to-market loss of $148 million, net of a tax benefit of $84 million, on economic hedges of the input and output commodities related to its fossil generation assets.
		Three Months Ended June 30, 2013
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues(a)	$	404		$	407		$	811		$	—		$	—		$	811
	Intersegment revenues	—			8			8			—			(8		)	—
	Total revenues	$	404		$	415		$	819		$	—		$	(8	)	$	811
	Segment income / Consolidated net income(a)	$	27		$	35		$	62		$	(4	)	$	—		$	58
	(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
		Six Months Ended June 30, 2014
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues(a)	$	977		$	317		$	1,294		$	—		$	—		$	1,294
	Intersegment revenues	—			12			12			—			(12		)	—
	Total revenues	$	977		$	329		$	1,306		$	—		$	(12	)	$	1,294
	Segment income (loss) / Consolidated net loss(a)(b)(c)	$	116		$	(1,105	)	$	(989	)	$	(8	)	$	—		$	(997	)
	(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
	(b)	Commercial Power includes an impairment charge related to the planned disposition of the Midwest Generation assets. See Note 2 for additional information.
	(c)	Commercial Power includes an after-tax mark-to-market loss of $181 million, net of a tax benefit of $101 million, on economic hedges of the input and output commodities related to its fossil generation assets.
		Six Months Ended June 30, 2013
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues(a)	$	896		$	662		$	1,558		$	—		$	—		$	1,558
	Intersegment revenues	—			19			19			—			(19		)	—
	Total revenues	$	896		$	681		$	1,577		$	—		$	(19	)	$	1,558
	Segment income (loss) / Consolidated net income(a)	$	80		$	(33	)	$	47		$	(10	)	$	—		$	37
	(a)	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.

Regulatory_Matters_Tables

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2014
Public Utilities, General Disclosures [Line Items]	'
Schedule of Potential Plant Retirements	'
	The table below contains the net carrying value of generating facilities planned for early retirement or being evaluated for potential retirement included in Property, plant and equipment, net on the Consolidated Balance Sheets.
		30-Jun-14
		Duke Energy			Duke Energy Carolinas(b)			Progress Energy			Duke Energy Florida(c)			Duke Energy Ohio(d)			Duke Energy Indiana(e)
	Capacity (in MW)	2,297			200			873			873			556			668
	Remaining net book value (in millions)(a)	$	253		$	13		$	111		$	111		$	9		$	120
	(a)	Included in Property, plant and equipment, net as of June 30, 2014, on the Condensed Consolidated Balance Sheets.
	(b)	Includes Lee Units 1 and 2. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. Duke Energy Carolinas expects to retire or convert these units by December 2020 in conjunction with a settlement agreement associated with the Cliffside Unit 6 air permit.
	(c)	Includes Crystal River Units 1 and 2.
	(d)	Includes Beckjord Units 5 and 6 and Miami Fort Unit 6. Beckjord units have no remaining book value.
	(e)	Includes Wabash River Units 2 through 6. Wabash River Unit 6 is being evaluated for potential conversion to gas. Duke Energy Indiana committed to retire or convert these units by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit.
Duke Energy Florida [Member]	'
Public Utilities, General Disclosures [Line Items]	'
Schedule of FPSC Settlement Agreement Customer Refunds	'
	The following table includes a summary of retail customer refunds agreed to in the 2012 Settlement and the 2013 Settlement. Refer to the 2013 Annual Report on Form 10-K for additional information on each of these refunds.
		June 30, 2014
								Remaining Amount to be Refunded
	(in millions)	Total			Refunded to date			2014			2015			2016
	2012 Settlement refund	$	288		$	199		$	69		$	10		$	10
	Retirement decision refund	100			—			—			40			60
	NEIL proceeds	490			408			82			—			—
	Total customer refunds	$	878		607			151			50			70
	Accelerated regulatory asset recovery	(130		)	(17		)	(20		)	(37		)	(56		)
	Net customer refunds	$	748		$	590		$	131		$	13		$	14
Duke Energy Ohio [Member]	'
Public Utilities, General Disclosures [Line Items]	'
Schedule of MISO Exit Fee Obligations	'
	The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded obligations related to its withdrawal from MISO. As of June 30, 2014, $74 million is recorded as a Regulatory asset on Duke Energy Ohio's Condensed Consolidated Balance Sheets.
	(in millions)	31-Dec-13			Provision /			Cash			30-Jun-14
					Adjustments			Reductions
	Duke Energy Ohio	$	95		$	1		$	(2	)	$	94

Commitments_and_Contingencies_

Commitments and Contingencies (Table)	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Accrual For Environmental Loss Contingencies	'
	The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Balance at beginning of period	$	79		$	11		$	27		$	8		$	19		$	27		$	7
	Provisions / adjustments	9			(1		)	4			3			1			5			—
	Cash reductions	(6		)	—			(4		)	(2		)	(2		)	(1		)	—
	Balance at end of period	$	82		$	10		$	27		$	9		$	18		$	31		$	7
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Balance at beginning of period	$	75		$	12		$	33		$	14		$	19		$	15		$	8
	Provisions / adjustments	4			—			4			1			3			(1		)	1
	Cash reductions	(12		)	—			(3		)	(1		)	(2		)	(6		)	(2		)
	Balance at end of period	$	67		$	12		$	34		$	14		$	20		$	8		$	7
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 presented in the table below.
	(in millions)
	Duke Energy	$	90
	Duke Energy Carolinas	25
	Progress Energy	9
	Duke Energy Progress	2
	Duke Energy Florida	7
	Duke Energy Ohio	51
	Duke Energy Indiana	5
Estimated Costs of Potential Approaches To Coal Ash Management [Table Text Block]	'
	On April 22, 2014, a representative of Duke Energy appeared before the Environmental Review Commission of the North Carolina General Assembly and outlined cost estimates for a range of ash handling and ash basin closure options. The table below summarizes estimated costs of various potential approaches to ash management for North Carolina ash basins. These amounts represent a rough order of magnitude and are not detailed engineering grade estimates. The estimates assume coal ash will retain a non-hazardous designation by the EPA and exclude financing costs. Any ultimate activities and resultant costs will be dependent upon state and federal environmental requirements.
	(in billions)		Range
	Baseline assumptions(a)		$	2	-	$	2.5
	Estimated additional costs related to full excavation(b)		4		-	5.5
	Estimated additional costs related to all-dry systems(c)		1		-	2
	Total range of costs(d)		$	2	-	$	10
	(a)	Assumes (i) hybrid cap in place closure for ash basins at ten coal plants, (ii) excavation and relocation of ash to lined structural fills or landfills for the retired Dan River, Riverbend and Sutton coal plants, (iii) dry fly ash conversion at the Asheville units and Cliffside Unit 5, (iv) continued structural fill disposal for the Asheville coal plant, and (v) dry bottom ash handling conversions and fly ash reliability improvements. Includes costs for actions noted in the March 12, 2014 letter to the governor of North Carolina and existing plans to close ash basins.
	(b)	Represents estimated additional costs to excavate and relocate ash to lined landfills for the ten plants under hybrid cap in place closure in the baseline assumptions.
	(c)	Represents estimated additional costs to convert all active coal plants to all-dry pneumatic bottom ash handling systems and thermally-driven evaporation of other process water.
	(d)	On average, the allocation of these estimates is approximately 65 percent to Duke Energy Carolinas and 35 percent to Duke Energy Progress. However, this allocation could vary significantly based on site-specific compliance actions.
Schedule of Litigation Reserves and Related Insurance Recoveries	'
	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 discussed above, excluding asbestos related reserves. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities. The reasonably possible range of loss for all non-asbestos related matters in excess of recorded reserves is not material.
	(in millions)	June 30, 2014			December 31, 2013
	Reserves for Legal Matters
	Duke Energy	$	197		$	204
	Progress Energy	73			78
	Duke Energy Progress	10			10
	Duke Energy Florida	42			43

Debt_and_Credit_Facilities_Tab

Debt and Credit Facilities (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule Of Significant Debt Issuances	'
	The following table summarizes significant debt issuances (in millions).
							Six Months Ended June 30, 2014
	Issuance Date	Maturity Date		Interest Rate			Duke Energy (Parent)			Duke Energy Progress			Duke Energy Florida			Duke Energy
	Unsecured Debt
	April 2014(a)	Apr-24		3.75	%		$	600		$	—		$	—		$	600
	April 2014(a)	Apr-17		0.61	%		400			—			—			400
	June 2014(b)	May-19		10.7	%		—			—			—			108
	June 2014(b)	May-21		13.9	%		—			—			—			110
	Secured Debt
	March 2014(c)	Mar-17		0.854	%		—			—			225			225
	First Mortgage Bonds
	March 2014(d)	Mar-44		4.375	%		—			400			—			400
	March 2014(d)	Mar-17		0.43	%		—			250			—			250
	Total issuances						$	1,000		$	650		$	225		$	2,093
	(a)	Proceeds were used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes. See Note 8 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.
	(b)	Proceeds will be used to repay $196 million of current maturities for International Energy and for general corporate purposes.
	(c)	Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Florida. Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes. See Note 12 for further details.
	(d)	Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.
Schedule Of Current Maturities	'
	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, 2014
	Unsecured Debt
	Duke Energy (Parent)	Sep-14		3.95	%		$	500
	Duke Energy (Parent)	Apr-15		3.35	%		450
	Duke Energy	Jul-14		15.37	%		196
	First Mortgage Bonds
	Duke Energy Ohio	Mar-15		0.37	%		150
	Duke Energy Progress	Apr-15		5.15	%		300
	Other						291
	Current maturities of long-term debt						$	1,887
Schedule Of Line Of Credit Facilities	'
	The table below includes the current borrowing sublimits and available capacity under the master credit facility.
		June 30, 2014
	(in millions)	Duke Energy				Duke Energy (Parent)			Duke Energy Carolinas			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Facility size(a)	$	6,000			$	2,250		$	1,000		$	750		$	650		$	650		$	700
	Reduction to backstop issuances
	Notes payable and commercial paper(b)	(1,409		)		(873		)	(300		)	(75		)	—			(11		)	(150		)
	Outstanding letters of credit	(64		)		(57		)	(4		)	(2		)	(1		)	—			—
	Tax-exempt bonds	(156		)		—			(75		)	—			—			—			(81		)
	Available capacity	$	4,371			$	1,320		$	621		$	673		$	649		$	639		$	469
	(a)	Represents the sublimit of each borrower at June 30, 2014.
	(b)	Duke Energy issued $450 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas and Duke Energy Indiana. The balances are classified within Long-term Debt in Duke Energy Carolinas' and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.

Goodwill_Tables

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill [Line Items]	'
Goodwill By Reportable Operating Segment	'
	The following tables present goodwill by reportable operating segment for Duke Energy and Duke Energy Ohio.
	Duke Energy
	(in millions)	Regulated Utilities			International Energy			Commercial Power			Total
	Balance at December 31, 2013
	Goodwill	$	15,950		$	326		$	935		$	17,211
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at December 31, 2013, as adjusted for accumulated impairment charges	15,950			326			64			16,340
	Foreign exchange and other changes	—			3			—			3
	Balance at June 30, 2014
	Goodwill	15,950			329			935			17,214
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at June 30, 2014, as adjusted for accumulated impairment charges	$	15,950		$	329		$	64		$	16,343
Duke Energy Ohio [Member]	'
Goodwill [Line Items]	'
Goodwill By Reportable Operating Segment	'
	Duke Energy Ohio
	(in millions)	Regulated Utilities			Commercial Power			Total
	Balance at December 31, 2013
	Goodwill	$	1,136		$	1,188		$	2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at December 31, 2013, as adjusted for accumulated impairment charges	920			—			920
	Balance at June 30, 2014
	Goodwill	1,136			1,188			2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at June 30, 2014, as adjusted for accumulated impairment charges	$	920		$	—		$	920

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2014
Duke Energy Carolinas [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
Progress Energy [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
Duke Energy Progress [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
Duke Energy Florida [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
Duke Energy Ohio [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.
Duke Energy Indiana [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	The Subsidiary Registrants engage in related party transactions, which are generally performed at cost and in accordance with the 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 in 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)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	217	$	235	$	439	$	478
	Indemnification coverages(b)	5		6		11		11
	Joint Dispatch Agreement (JDA) revenue(c)	15		24		112		77
	Joint Dispatch Agreement (JDA) expense(c)	40		22		91		32
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	200	$	111	$	378	$	273
	Corporate governance and shared services provided to Duke Energy(d)	—		22		—		50
	Indemnification coverages(b)	8		9		17		17
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	104	$	66	$	200	$	162
	Indemnification coverages(b)	4		5		9		10
	JDA revenue(c)	40		22		91		32
	JDA expense(c)	15		24		112		77
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	97	$	45	$	178	$	111
	Indemnification coverages(b)	4		4		8		7
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	82	$	85	$	159	$	172
	Indemnification coverages(b)	3		4		6		8
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	101	$	199	$	200
	Indemnification coverages(b)	3		3		5		5
	(a)	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are 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)	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
	(d)	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended June 30, 2014.

Derivatives_and_Hedging_Tables

Derivatives and Hedging (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative [Line Items]	'
Underlying Notional Amounts for Commodity Derivative Instruments Accounted for at Fair Value	'
	Where all commodity positions are perfectly offset, no quantities are shown.
		June 30, 2014
		Duke Energy			Duke Energy Carolinas			Progress Energy		Duke Energy Progress		Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Electricity (gigawatt-hours)(a)	41,147			284			74		74		—			37,608			291
	Natural gas (millions of decatherms)	683			—			323		109		214			360			—
		December 31, 2013
		Duke Energy			Duke Energy Carolinas			Progress Energy		Duke Energy Progress		Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Electricity (gigawatt-hours)(a)	71,466			1,205			925		925		—			69,362			203
	Natural gas (millions of decatherms)	636			—			363		141		222			274			—
	(a)	Amounts at Duke Energy Ohio include intercompany positions that eliminate at Duke Energy.
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk	'
	The following tables show notional amounts for derivatives related to interest rate risk.
		June 30, 2014							December 31, 2013
	(in millions)	Duke				Duke			Duke			Duke
		Energy				Energy			Energy			Energy
						Ohio						Ohio
	Cash flow hedges(a)	$	764			$	—		$	798		$	—
	Undesignated contracts	27				27			34			27
	Total notional amount	$	791			$	27		$	832		$	27
	(a)	Duke Energy includes amounts related to consolidated VIEs of $552 million at June 30, 2014 and $584 million at December 31, 2013.
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets	'
	The following table shows the fair value of derivatives and the line items in the Condensed Consolidated Balance Sheets where they are reported. 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.
		June 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Designated as Hedging Instruments
	Commodity contracts
	Current Liabilities: Other	$	—			$	1		$	—		$	1
	Interest rate contracts
	Investments and Other Assets: Other	16				—			27			—
	Current Liabilities: Other	—				15			—			18
	Deferred Credits and Other Liabilities: Other	—				19			—			4
	Total Derivatives Designated as Hedging Instruments	16				35			27			23
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	62				4			201			158
	Current Assets: Assets Held for Sale	12				3			—			—
	Investments and Other Assets: Other	11				1			215			131
	Investments and Other Assets: Assets Held for Sale	12				4			—			—
	Current Liabilities: Other	16				134			13			153
	Current Liabilities: Liabilities Associated with Assets Held for Sale	416				563			—			—
	Deferred Credits and Other Liabilities: Other	4				57			5			166
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	248				364			—			—
	Interest rate contracts
	Current Liabilities: Other	—				1			—			1
	Deferred Credits and Other Liabilities: Other	—				5			—			4
	Total Derivatives Not Designated as Hedging Instruments	781				1,136			434			613
	Total Derivatives	$	797			$	1,171		$	461		$	636
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income	'
	The following table shows the gains and losses recognized on cash flow hedges and the line items on the Condensed Consolidated Statements of Operations where such gains and losses are included when reclassified from AOCI. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Pretax Gains (Losses) Recorded in AOCI
	Interest rate contracts	$	(11	)		$	58		$	(9	)	$	71
	Commodity contracts	—				—			—			1
	Total Pretax Gains (Losses) Recorded in AOCI	$	(11	)		$	58		$	(9	)	$	72
	Location of Pretax Gains (Losses) Reclassified from AOCI into Earnings
	Interest rate contracts
	Interest expense	(4		)		—			(5		)	(1		)
	Total Pretax Gains (Losses) Reclassified from AOCI into Earnings	$	(4	)		$	—		$	(5	)	$	(1	)
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities	'
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Revenue: Regulated electric	$	3			$	1		$	(1	)	$	7
	Revenue: Nonregulated electric, natural gas and other	(221		)		74			(618		)	(8		)
	Fuel used in electric generation and purchased power - regulated	(21		)		(37		)	(14		)	(89		)
	Fuel used in electric generation and purchased power - nonregulated	(25		)		(11		)	113			(18		)
	Interest rate contracts
	Interest expense	(5		)		(5		)	(9		)	(9		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(269	)		$	22		$	(529	)	$	(117	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	1			$	(110	)	$	(1	)	$	(5	)
	Regulatory liabilities	(28		)		9			(1		)	4
	Interest rate contracts
	Regulatory assets	12				26			16			39
	Regulatory liabilities	28				—			28			—
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	13			$	(75	)	$	42		$	38
Offsetting Assets and Liabilities	'
		June 30, 2014
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	506			$	282		$	715		$	442
	Gross amounts offset	(504		)		(277		)	(576		)	(366		)
	Net amount subject to master netting	2				5			139			76
	Amounts not subject to master netting	—				9			6			8
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	14		$	145		$	84
		December 31, 2013
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(e)				Non-Current(f)			Current(g)			Non-Current(h)
	Gross amounts recognized	$	214			$	233		$	322		$	299
	Gross amounts offset	(179		)		(138		)	(192		)	(155		)
	Net amounts subject to master netting	35				95			130			144
	Amounts not subject to master netting	—				14			4			11
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	35			$	109		$	134		$	155
	(a)	Included in Other and Assets Held for Sale within Current Assets on the Condensed Consolidated Balance Sheet.
	(b)	Included in Other and Assets Held for Sale within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(c)	Included in Other and Liabilities Associated with Assets Held for Sale within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(d)	Included in Other and Liabilities Associated with Assets Held for Sale within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
	(e)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
	(f)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(g)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(h)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent 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. Amounts for Duke Energy Carolinas and Duke Energy Indiana were not material.
		June 30, 2014
	(in millions)	Duke				Progress Energy			Duke			Duke				Duke
		Energy							Energy			Energy				Energy
									Progress			Florida				Ohio
	Aggregate fair value amounts of derivative instruments in a net liability position	$	911			$	13		$	4		$	9			$	911
	Fair value of collateral already posted	276				2			—			2				266
	Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	76				11			4			7				80
		December 31, 2013
	(in millions)	Duke				Progress Energy			Duke			Duke				Duke
		Energy							Energy			Energy				Energy
									Progress			Florida				Ohio
	Aggregate fair value amounts of derivative instruments in a net liability position	$	525			$	168		$	60		$	108			$	355
	Fair value of collateral already posted	135				10			—			10				125
	Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	205				158			60			98				47
Schedule Of Cash Collateral Under Master Netting Arrangements	'
		June 30, 2014							December 31, 2013
	(in millions)	Receivables				Payables			Receivables			Payables
	Duke Energy
	Amounts offset against net derivative positions	$	161			$	—		$	30		$	—
	Amounts not offset against net derivative positions	115				—			122			—
	Progress Energy
	Amounts offset against net derivative positions	2				—			10			—
	Duke Energy Florida
	Amounts offset against net derivative positions	2				—			10			—
	Duke Energy Ohio
	Amounts offset against net derivative positions	158				—			19			—
	Amounts not offset against net derivative positions	108				—			115			—
	Duke Energy Indiana
	Amounts offset against net derivative positions	—				—			—			1
	Amounts not offset against net derivative positions	—				—			1			—
Progress Energy [Member]	'
Derivative [Line Items]	'
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets	'
		June 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Designated as Hedging Instruments
	Commodity contracts
	Current Liabilities: Other	$	—			$	—		$	—		$	1
	Deferred Credits and Other Liabilities: Other	—				—			—			4
	Total Derivatives Designated as Hedging Instruments	—				—			—			5
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	5				4			3			2
	Investments and Other Assets: Other	2				1			2			1
	Current Liabilities: Other	17				120			11			105
	Deferred Credits and Other Liabilities: Other	4				47			4			91
	Total Derivatives Not Designated as Hedging Instruments	28				172			20			199
	Total Derivatives	$	28			$	172		$	20		$	204
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities	'
	The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains or losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause. Amounts included in Regulatory Assets or Liabilities for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Operating revenues	$	2			$	1		$	(1	)	$	7
	Fuel used in electric generation and purchased power	(21		)		(37		)	(14		)	(89		)
	Interest rate contracts
	Interest expense	4				(5		)	—			(9		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(15	)		$	(41	)	$	(15	)	$	(91	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	2			$	(108	)	$	—		$	(3	)
	Interest rate contracts
	Regulatory assets	12				4			16			9
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	14			$	(104	)	$	16		$	6
Offsetting Assets and Liabilities	'
		June 30, 2014
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	21			$	7		$	125		$	47
	Gross amounts offset	(20		)		(5		)	(21		)	(6		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	1			$	2		$	104		$	41
		December 31, 2013
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	15			$	5		$	107		$	93
	Gross amounts offset	(13		)		(4		)	(17		)	(10		)
	Net amounts subject to master netting	2				1			90			83
	Amounts not subject to master netting	—				—			—			4
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	1		$	90		$	87
	(a)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
	(b)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(c)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Duke Energy Progress [Member]	'
Derivative [Line Items]	'
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets	'
		June 30, 2014							31-Dec-13
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Designated as Hedging Instruments
	Commodity contracts
	Current Liabilities: Other	$	—			$	1		$	—		$	1
	Total Derivatives Designated as Hedging Instruments	—				1			—			1
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	2				2			—			—
	Investments and Other Assets: Other	1				—			2			1
	Current Liabilities: Other	9				54			2			40
	Deferred Credits and Other Liabilities: Other	1				17			2			29
	Total Derivatives Not Designated as Hedging Instruments	13				73			6			70
	Total Derivatives	$	13			$	74		$	6		$	71
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities	'
	The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported. Amounts included in Regulatory Assets or Liabilities for commodity contracts are reclassified to earnings to match recovery through the fuel clause. Amounts included in Regulatory Assets or Liabilities for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt.
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Operating revenues	$	2			$	1		$	(1	)	$	7
	Fuel used in electric generation and purchased power	(16		)		(12		)	(9		)	(29		)
	Interest rate contracts
	Interest expense	3				(3		)	—			(6		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(11	)		$	(14	)	$	(10	)	$	(28	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	23			$	(43	)	$	40		$	(7	)
	Interest rate contracts
	Regulatory assets	(3		)		4			—			7
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	20			$	(39	)	$	40		$	—
Offsetting Assets and Liabilities	'
		June 30, 2014
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	11			$	2		$	57		$	17
	Gross amounts offset	(11		)		(1		)	(11		)	(1		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	1		$	46		$	16
		December 31, 2013
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	3			$	3		$	41		$	30
	Gross amounts offset	(3		)		(3		)	(3		)	(3		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	38		$	27
	(a)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
	(b)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(c)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
Duke Energy Florida [Member]	'
Derivative [Line Items]	'
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets	'
		June 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	$	2			$	2		$	3		$	2
	Investments and Other Assets: Other	1				1			—			—
	Current Liabilities: Other	9				66			9			64
	Deferred Credits and Other Liabilities: Other	3				29			2			63
	Total Derivatives	$	15			$	98		$	14		$	129
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities	'
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Operating revenues	$	—			$	—		$	—		$	—
	Fuel used in electric generation and purchased power	(6		)		(25		)	(6		)	(60		)
	Interest rate contracts
	Interest expense	1				(1		)	—			(2		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(5	)		$	(26	)	$	(6	)	$	(62	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	(5	)		$	(66	)	$	(24	)	$	3
	Interest rate contracts
	Regulatory assets	(1		)		1			—			2
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(6	)		$	(65	)	$	(24	)	$	5
Offsetting Assets and Liabilities	'
	The tables below show the balance sheet location of derivative contracts subject to enforceable master netting agreements and include collateral posted to offset the net position. This disclosure is intended to enable users to evaluate the effect of netting arrangements on financial position. The amounts shown were 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.
		June 30, 2014
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	10			$	5		$	68		$	30
	Gross amounts offset	(9		)		(4		)	(10		)	(5		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	1			$	1		$	58		$	25
		December 31, 2013
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	12			$	2		$	66		$	63
	Gross amounts offset	(10		)		(2		)	(15		)	(7		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	2			$	—		$	51		$	56
	(a)	Included in Other within Current Assets on the Condensed Balance Sheet.
	(b)	Included in Other within Investments and Other Assets on the Condensed Balance Sheet.
	(c)	Included in Other within Current Liabilities on the Condensed Balance Sheet.
	(d)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Balance Sheet.
Duke Energy Ohio [Member]	'
Derivative [Line Items]	'
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets	'
		June 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	$	—			$	—		$	186		$	163
	Current Assets: Assets Held for Sale	11				2			—			—
	Investments and Other Assets: Other	—				—			202			130
	Investments and Other Assets: Assets Held for Sale	10				3			—			—
	Current Liabilities: Other	—				—			1			36
	Current Liabilities: Liabilities Associated with Assets Held for Sale	502				634			—			—
	Deferred Credits and Other Liabilities: Other	—				—			2			56
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	318				472			—			—
	Interest rate contracts
	Current Liabilities: Other	—				1			—			1
	Deferred Credits and Other Liabilities: Other	—				5			—			4
	Total Derivatives Designated as Hedging Instruments	841				1,117			391			390
	Total Derivatives	$	841			$	1,117		$	391		$	390
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities	'
	The following table shows the gains and losses during the year recognized on undesignated derivatives and the line items on the Condensed Consolidated Statements of Operations and Comprehensive Income or the Condensed Consolidated Balance Sheets where the pretax gains and losses were reported.
		Three Months Ended June 30,							Six Months Ended June 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Revenue, nonregulated electric, natural gas and other	$	(248	)		$	78		$	(697	)	$	(13	)
	Fuel used in electric generation and purchased power	(25		)		(11		)	113			(18		)
	Interest rate contracts
	Interest expense	(1		)		(1		)	(1		)	(1		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(274	)		$	66		$	(585	)	$	(32	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	—			$	—		$	(1	)	$	—
	Regulatory assets	(3		)		—			—			—
	Interest rate contracts
	Regulatory assets	—				2			—			3
	Regulatory liabilities	6				—			6			—
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	3			$	2		$	5		$	3
Offsetting Assets and Liabilities	'
		June 30, 2014
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(a)				Non-Current(b)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	513			$	328		$	637		$	480
	Gross amounts offset	(504		)		(322		)	(574		)	(410		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	9			$	6		$	63		$	70
		December 31, 2013
		Derivative Assets							Derivative Liabilities
	(in millions)	Current(e)				Non-Current(f)			Current(g)			Non-Current(h)
	Gross amounts recognized	$	186			$	205		$	199		$	186
	Gross amounts offset	(165		)		(132		)	(173		)	(143		)
	Net amounts subject to master netting	21				73			26			43
	Amounts not subject to master netting	—				—			1			4
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	21			$	73		$	27		$	47
	(a)	Included in Assets Held for Sale within Current Assets on the Condensed Consolidated Balance Sheet.
	(b)	Included in Assets Held for Sale within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(c)	Included in Liabilities Associated with Assets Held for Sale within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(d)	Included in Liabilities Associated with Assets Held for Sale within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
	(e)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
	(f)	Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
	(g)	Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
	(h)	Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.

Investments_in_Debt_and_Equity1

Investments in Debt and Equity Securities Investments in Debt and Equity Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	70	$	—	$	—	$	110
	Equity securities	2,007		14		3,873		1,813		10		3,579
	Corporate debt securities	17		2		492		8		6		400
	Municipal bonds	5		1		144		2		6		160
	U.S. government bonds	14		3		700		7		12		730
	Other debt securities	1		1		142		22		2		154
	Total NDTF	$	2,044	$	21	$	5,421	$	1,852	$	36	$	5,133
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	21
	Equity securities	34		—		97		29		—		91
	Corporate debt securities	2		—		66		1		1		99
	Municipal bonds	4		1		82		2		2		79
	U.S. government bonds	—		—		13		—		—		17
	Other debt securities	1		6		110		—		8		111
	Total Other Investments(a)	$	41	$	7	$	385	$	32	$	11	$	418
	Total Investments	$	2,085	$	28	$	5,806	$	1,884	$	47	$	5,551
	(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	57
	Due after one through five years	459
	Due after five through 10 years	440
	Due after 10 years	793
	Total	$	1,749
Schedule of Realized Gain (Loss)	'
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	31	$	32	$	62	$	63
	Realized losses	2		15		6		22
Duke Energy Carolinas [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	33	$	—	$	—	$	42
	Equity securities	1,085		8		2,156		974		6		1,964
	Corporate debt securities	10		2		343		5		5		274
	Municipal bonds	1		—		36		—		2		54
	U.S. government bonds	5		1		306		3		7		354
	Other debt securities	—		1		125		22		2		146
	Total NDTF	$	1,101	$	12	$	2,999	$	1,004	$	22	$	2,834
	Other Investments
	Other debt securities	$	—	$	1	$	3	$	—	$	1	$	3
	Total Other Investments(a)	$	—	$	1	$	3	$	—	$	1	$	3
	Total Investments	$	1,101	$	13	$	3,002	$	1,004	$	23	$	2,837
	(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	24
	Due after one through five years	182
	Due after five through 10 years	243
	Due after 10 years	364
	Total	$	813
Schedule of Realized Gain (Loss)	'
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	29	$	21	$	52	$	46
	Realized losses	1		6		2		10
Progress Energy [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	37	$	—	$	—	$	68
	Equity securities	922		6		1,717		839		4		1,615
	Corporate debt securities	7		—		149		3		1		126
	Municipal bonds	4		1		108		2		4		106
	U.S. government bonds	9		2		394		4		5		376
	Other debt securities	1		—		17		—		—		8
	Total NDTF	$	943	$	9	$	2,422	$	848	$	14	$	2,299
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	20
	Municipal bonds	3		—		41		1		—		39
	Total Other Investments(a)	$	3	$	—	$	58	$	1	$	—	$	59
	Total Investments	$	946	$	9	$	2,480	$	849	$	14	$	2,358
	(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	24
	Due after one through five years	217
	Due after five through 10 years	141
	Due after 10 years	327
	Total	$	709
Schedule of Realized Gain (Loss)	'
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	2	$	10	$	9	$	15
	Realized losses	1		7		3		9
Duke Energy Progress [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	27	$	—	$	—	$	48
	Equity securities	590		4		1,139		535		3		1,069
	Corporate debt securities	5		—		94		3		1		80
	Municipal bonds	4		1		106		2		4		104
	U.S. government bonds	7		2		256		4		3		232
	Other debt securities	1		—		10		—		—		5
	Total NDTF	$	607	$	7	$	1,632	$	544	$	11	$	1,538
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	2
	Total Other Investments(a)	$	—	$	—	$	2	$	—	$	—	$	2
	Total Investments	$	607	$	7	$	1,634	$	544	$	11	$	1,540
	(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	15
	Due after one through five years	141
	Due after five through 10 years	90
	Due after 10 years	220
	Total	$	466
Schedule of Realized Gain (Loss)	'
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	1	$	6	$	7	$	8
	Realized losses	—		3		2		4
Duke Energy Florida [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	NDTF
	Cash and cash equivalents	$	—	$	—	$	10	$	—	$	—	$	20
	Equity securities	332		2		578		304		1		546
	Corporate debt securities	2		—		55		—		—		46
	Municipal bonds	—		—		2		—		—		2
	U.S. government bonds	2		—		138		—		2		144
	Other debt securities	—		—		7		—		—		3
	Total NDTF	$	336	$	2	$	790	$	304	$	3	$	761
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	3
	Municipal bonds	3		—		41		1		—		39
	Total Other Investments(a)	$	3	$	—	$	43	$	1	$	—	$	42
	Total Investments	$	339	$	2	$	833	$	305	$	3	$	803
	(a)    These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	9
	Due after one through five years	76
	Due after five through 10 years	51
	Due after 10 years	107
	Total	$	243
Schedule of Realized Gain (Loss)	'
	Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	1	$	5	$	2	$	8
	Realized losses	—		3		1		4
Duke Energy Indiana [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Available-for-sale Securities	'
	The following table presents the estimated fair value of investments in available-for-sale securities.
		June 30, 2014						December 31, 2013
	(in millions)	Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
	Equity securities	27		—		69		24		—		65
	Municipal bonds	—		1		30		—		1		28
	Total Other Investments(a)	$	27	$	1	$	100	$	24	$	1	$	94
	Total Investments	$	27	$	1	$	100	$	24	$	1	$	94
	(a)    These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
Investments Classified by Contractual Maturity Date	'
	The table below summarizes the maturity date for debt securities.
	(in millions)	June 30, 2014
	Due in one year or less	$	1
	Due after one through five years	19
	Due after five through 10 years	7
	Due after 10 years	3
	Total	$	30

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Line Items]	'
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. Amounts included in earnings for derivatives are primarily included in Operating Revenues.
		Three Months Ended June 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	99			$	(14	)		$	85
	Total pretax realized or unrealized gains (losses) included in earnings	—				(6		)		(6		)
	Purchases, sales, issuances and settlements:
	Purchases	15				51				66
	Sales	(1		)		—				(1		)
	Issuances	—				(1		)		(1		)
	Settlements	—				(6		)		(6		)
	Transfers out of Level 3 due to observability of inputs	68				2				70
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7				(4		)		3
	Balance at end of period	$	188			$	22			$	210
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(25	)		$	(25	)
		Three Months Ended June 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	98			$	(82	)		$	16
	Total pretax realized or unrealized gains (losses) included in earnings	—				(11		)		(11		)
	Total pretax gains included in other comprehensive income	(1		)		—				(1		)
	Purchases, sales, issuances and settlements:
	Purchases	3				21				24
	Issuances	(3		)		—				(3		)
	Settlements	(1		)		(9		)		(10		)
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				(6		)		(5		)
	Balance at end of period	$	97			$	(87	)		$	10
		Six Months Ended June 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	98			$	13			$	111
	Total pretax realized or unrealized gains (losses) included in earnings	—				12				12
	Purchases, sales, issuances and settlements:
	Purchases	16				51				67
	Sales	(2		)		—				(2		)
	Issuances	—				(1		)		(1		)
	Settlements	—				(45		)		(45		)
	Transfers out of Level 3 due to observability of inputs	68				(3		)		65
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	8				(5		)		3
	Balance at end of period	$	188			$	22			$	210
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(25	)		$	(25	)
		Six Months Ended June 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	98			$	(85	)		$	13
	Total pretax realized or unrealized gains (losses) included in earnings	—				(21		)		(21		)
	Total pretax gains included in other comprehensive income	(2		)		—				(2		)
	Purchases, sales, issuances and settlements:
	Purchases	3				21				24
	Sales	(3		)		—				(3		)
	Issuances	—				6				6
	Settlements	(1		)		(2		)		(3		)
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				(6		)		(4		)
	Balance at end of period	$	97			$	(87	)		$	10
Fair Value Measurement Amounts For Assets And Liabilities	'
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,873			$	3,703			$	2			$	168
	Nuclear decommissioning trust fund debt securities	1,548				374				1,174				—
	Other trading and available-for-sale equity securities	98				98				—				—
	Other trading and available-for-sale debt securities	294				28				246				20
	Derivative assets	133				8				66				59
	Total assets	5,946				4,211				1,488				247
	Derivative liabilities	(507		)		(150		)		(320		)		(37		)
	Net assets	$	5,439			$	4,061			$	1,168			$	210
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,579			$	3,495			$	57			$	27
	Nuclear decommissioning trust fund debt securities	1,553				402				1,100				51
	Other trading and available-for-sale equity securities	102				91				11				—
	Other trading and available-for-sale debt securities	333				36				277				20
	Derivative assets	145				33				70				42
	Total assets	5,712				4,057				1,515				140
	Derivative liabilities	(321		)		11				(303		)		(29		)
	Net assets	$	5,391			$	4,068			$	1,212			$	111
Quantitative Information Table - Level 3	'
	The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
		30-Jun-14
	Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
		(in millions)
	Duke Energy
	Natural gas contracts	$	(1	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	2.92		-	$	4.71
	Financial transmission rights (FTRs)	45			RTO auction pricing	FTR price - per MWh	(4.53		)	-	60.9
	Electricity contracts	(9		)	Discounted cash flow	Forward electricity curves - price per MWh	25.1			-	62.77
	Commodity capacity option contracts	4			Discounted cash flow	Forward capacity option curves  - price per MW day	27.65			-	161.1
	Reserves	(17		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	22
	Duke Energy Carolinas
	Electricity contracts	$	(3	)	Discounted cash flow	Forward electricity curves - price per MWh	36.37			-	62.54
	Duke Energy Ohio
	Electricity contracts	$	(13	)	Discounted cash flow	Forward electricity curves - price per MWh	25.55			-	65.42
	Natural gas contracts	(1		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	2.92			-	4.71
	Reserves	(14		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	(28	)
	Duke Energy Indiana
	FTRs	$	45		RTO auction pricing	FTR price - per MWh	(4.53		)	-	60.9
		31-Dec-13
	Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
		(in millions)
	Duke Energy
	Natural gas contracts	$	(2	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.07		-	$	5.37
	FERC mitigation power sale agreements	(2		)	Discounted cash flow	Forward electricity curves - price per MWh	25.79			-	52.38
	Financial transmission rights (FTRs)	12			RTO auction pricing	FTR price - per MWh	(0.30		)	-	13.8
	Electricity contracts	23			Discounted cash flow	Forward electricity curves - price per MWh	20.77			-	58.9
	Commodity capacity option contracts	4			Discounted cash flow	Forward capacity option curves  - price per MW day	30.4			-	165.1
	Reserves	(22		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	13
	Duke Energy Carolinas
	FERC mitigation power sale agreements	$	(2	)	Discounted cash flow	Forward electricity curves - price per MWh	25.79			-	52.38
	Duke Energy Ohio
	Electricity contracts	$	18		Discounted cash flow	Forward electricity curves - price per MWh	20.77			-	58.9
	Natural gas contracts	(2		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	3.07			-	5.37
	Reserves	(20		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	(4	)
	Duke Energy Indiana
	FTRs	$	12		RTO auction pricing	FTR price - per MWh	(0.30		)	-	13.8
Schedule of Long-term debt, including current	'
	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, 2014							December 31, 2013
	(in millions)	Book Value			Fair Value				Book Value			Fair Value
	Duke Energy	$	40,593		$	44,558			$	40,256		$	42,592
	Duke Energy Carolinas	8,435			9,510				8,436			9,123
	Progress Energy	14,518			16,387				14,115			15,234
	Duke Energy Progress	5,717			6,045				5,235			5,323
	Duke Energy Florida	5,107			5,892				4,886			5,408
	Duke Energy Ohio	1,784			1,983				2,188			2,237
	Duke Energy Indiana	3,795			4,374				3,796			4,171
Duke Energy Carolinas [Member]	'
Fair Value Disclosures [Line Items]	'
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.
		Three Months Ended June 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	82			$	(4	)		$	78
	Purchases, sales, issuances and settlements:
	Purchases	15				—				15
	Sales	(1		)		—				(1		)
	Settlements	—				1				1
	Transfers out of Level 3 due to observability of inputs	68				—				68
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7				—				7
	Balance at end of period	$	171			$	(3	)		$	168
		Three Months Ended June 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	73			$	(5	)		$	68
	Purchases, sales, issuances and settlements:
	Purchases	3				—				3
	Sales	(3		)		—				(3		)
	Settlements	—				1				1
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				—				1
	Balance at end of period	$	74			$	(4	)		$	70
		Six Months Ended June 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	81			$	(2	)		$	79
	Purchases, sales, issuances and settlements:
	Purchases	16				—				16
	Sales	(2		)		—				(2		)
	Settlements	—				(1		)		(1		)
	Transfers out of Level 3 due to observability of inputs	68				—				68
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	8				—				8
	Balance at end of period	$	171			$	(3	)		$	168
		Six Months Ended June 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	72			$	(12	)		$	60
	Purchases, sales, issuances and settlements:
	Purchases	3				—				3
	Sales	(3		)		—				(3		)
	Settlements	—				8				8
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				—				2
	Balance at end of period	$	74			$	(4	)		$	70
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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	2,156			$	1,986			$	2			$	168
	Nuclear decommissioning trust fund debt securities	843				147				696				—
	Other trading and available-for-sale debt securities	3				—				—				3
	Total assets	3,002				2,133				698				171
	Derivative liabilities	(3		)		—				—				(3		)
	Net assets	$	2,999			$	2,133			$	698			$	168
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,964			$	1,879			$	58			$	27
	Nuclear decommissioning trust fund debt securities	870				168				651				51
	Other trading and available-for-sale debt securities	3				—				—				3
	Total assets	2,837				2,047				709				81
	Derivative liabilities	(2		)		—				—				(2		)
	Net assets	$	2,835			$	2,047			$	709			$	79
Progress Energy [Member]	'
Fair Value Disclosures [Line Items]	'
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)	2014				2013				2014				2013
	Balance at beginning of period	$	(3	)		$	(31	)		$	—			$	(38	)
	Total pretax realized or unrealized gains included in earnings	3				—				—				—
	Purchases, sales, issuances and settlements:
	Issuances	—				1				—				7
	Transfers out of Level 3 due to observability of inputs	2				—				2				—
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(2		)		(5		)		(2		)		(4		)
	Balance at end of period	$	—			$	(35	)		$	—			$	(35	)
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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,717			$	1,717			$	—			$	—
	Nuclear decommissioning trust fund debt securities	705				227				478				—
	Other trading and available-for-sale debt securities	58				16				42				—
	Derivative assets	3				—				3				—
	Total assets	2,483				1,960				523				—
	Derivative liabilities	(147		)		—				(147		)		—
	Net assets	$	2,336			$	1,960			$	376			$	—
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,615			$	1,615			$	—			$	—
	Nuclear decommissioning trust fund debt securities	677				233				444				—
	Other trading and available-for-sale debt securities	58				19				39				—
	Derivative assets	3				—				3				—
	Total assets	2,353				1,867				486				—
	Derivative liabilities	(187		)		—				(187		)		—
	Net assets	$	2,166			$	1,867			$	299			$	—
Duke Energy Progress [Member]	'
Fair Value Disclosures [Line Items]	'
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	'
		Derivatives (net)
		Three Months Ended June 30,								Six Months Ended June 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	(3	)		$	(31	)		$	—			$	(38	)
	Total pretax realized or unrealized gains included in earnings	3				—				—				—
	Purchases, sales, issuances and settlements:
	Issuances	—				1				—				7
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—				(5		)		—				(4		)
	Balance at end of period	$	—			$	(35	)		$	—			$	(35	)
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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,139			$	1,139			$	—			$	—
	Nuclear decommissioning trust fund debt securities	493				149				344				—
	Other trading and available-for-sale debt securities	2				2				—				—
	Derivative assets	1				—				1				—
	Total assets	1,635				1,290				345				—
	Derivative liabilities	(62		)		—				(62		)		—
	Net assets	$	1,573			$	1,290			$	283			$	—
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,069			$	1,069			$	—			$	—
	Nuclear decommissioning trust fund debt securities	470				137				333				—
	Other trading and available-for-sale debt securities	3				3				—				—
	Derivative assets	1				—				1				—
	Total assets	1,543				1,209				334				—
	Derivative liabilities	(66		)		—				(66		)		—
	Net assets	$	1,477			$	1,209			$	268			$	—
Duke Energy Florida [Member]	'
Fair Value Disclosures [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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	578			$	578			$	—			$	—
	Nuclear decommissioning trust fund debt securities and other	212				78				134				—
	Other trading and available-for-sale debt securities and other	43				1				42				—
	Derivative assets	2				—				2				—
	Total assets	835				657				178				—
	Derivative liabilities	(85		)		—				(85		)		—
	Net assets	$	750			$	657			$	93			$	—
		31-Dec-13
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	546			$	546			$	—			$	—
	Nuclear decommissioning trust fund debt securities and other	214				96				118				—
	Other trading and available-for-sale debt securities and other	40				2				38				—
	Derivative assets	1				—				1				—
	Total assets	801				644				157				—
	Derivative liabilities	(116		)		—				(116		)		—
	Net assets	$	685			$	644			$	41			$	—
Duke Energy Ohio [Member]	'
Fair Value Disclosures [Line Items]	'
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	'
		Derivatives (net)
		Three Months Ended June 30,								Six Months Ended June 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	(19	)		$	(5	)		$	(4	)		$	(6	)
	Total pretax realized or unrealized gains (losses) included in earnings	(13		)		(14		)		(19		)		(10		)
	Purchases, sales, issuances and settlements:
	Purchases	1				1				1				1
	Settlements	—				—				(4		)		(3		)
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2				(1		)		2				(1		)
	Transfers out of Level 3 due to observability of inputs	1				—				(4		)		—
	Balance at end of period	$	(28	)		$	(19	)		$	(28	)		$	(19	)
	Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at June 30, 2014									$	(27	)
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 table below exclude cash collateral, which is disclosed in Note 9.
		June 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Derivative assets	$	18			$	—			$	11			$	7
	Derivative liabilities	(294		)		(145		)		(114		)		(35		)
	Net assets (liabilities)	$	(276	)		$	(145	)		$	(103	)		$	(28	)
		December 31, 2013
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Derivative assets	$	96			$	50			$	21			$	25
	Derivative liabilities	(95		)		(1		)		(65		)		(29		)
	Net assets (liabilities)	$	1			$	49			$	(44	)		$	(4	)
Duke Energy Indiana [Member]	'
Fair Value Disclosures [Line Items]	'
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)	2014				2013				2014				2013
	Balance at beginning of period	$	7			$	4			$	12			$	10
	Total pretax realized or unrealized gains (losses) included in earnings	—				7				27				2
	Purchases, sales, issuances and settlements:
	Purchases	49				20				49				—
	Sales	—				—				—				20
	Settlements	(7		)		(13		)		(38		)		(13		)
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(4		)		—				(5		)		(1		)
	Balance at end of period	$	45			$	18			$	45			$	18
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 table below exclude cash collateral, which is disclosed in Note 9. See Note 10 for additional information related to investments by major security type.
		30-Jun-14
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Available-for-sale equity securities	$	70			$	70			$	—			$	—
	Available-for-sale debt securities	30				—				30				—
	Derivative assets	45				—				—				45
	Net assets	$	145			$	70			$	30			$	45
		31-Dec-13
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Available-for-sale equity securities	$	65			$	65			$	—			$	—
	Available-for-sale debt securities	29				—				29				—
	Derivative assets	12				—				—				12
	Net assets	$	106			$	65			$	29			$	12

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2014
Variable Interest Entities [Line Items]	'
Schedule Of Consolidated VIEs	'
	The table below shows VIEs consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		June 30, 2014
		Duke Energy
		Duke Energy Carolinas				Duke Energy Progress				Duke Energy Florida
	(in millions)	DERF				DEPR				DEFR			CRC			Renewables			Other			Total
	ASSETS
	Current Assets
	Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	$	704			$	471			$	403		$	506		$	17		$	19		$	2,120
	Other	—				—				—			—			115			12			127
	Investments and Other Assets
	Other	—				—				—			—			30			39			69
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—				—				—			—			1,856			18			1,874
	Accumulated depreciation and amortization	—				—				—			—			(214		)	(5		)	(219		)
	Regulatory Assets and Deferred Debits
	Other	1				—				1			—			33			—			35
	Total assets	$	705			$	471			$	404		$	506		$	1,837		$	83		$	4,006
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—			$	—			$	—		$	—		$	3		$	—		$	3
	Taxes accrued	—				—				—			—			4			—			4
	Current maturities of long-term debt	—				—				—			—			64			16			80
	Other	—				—				—			—			17			11			28
	Long-term Debt(b)	400				300				225			325			863			26			2,139
	Deferred Credits and Other Liabilities
	Deferred income taxes	—				—				—			—			292			—			292
	Asset retirement obligations	—				—				—			—			30			—			30
	Other	—				—				—			—			33			9			42
	Total liabilities	$	400			$	300			$	225		$	325		$	1,306		$	62		$	2,618
	Net assets of consolidated variable interest entities	$	305			$	171			$	179		$	181		$	531		$	21		$	1,388
	(a)    Restricted as collateral for non-recourse debt of VIEs.
	(b)    Non-recourse to the general assets of the applicable registrant.
		December 31, 2013
		Duke Energy
		Duke Energy Carolinas				Duke Energy Progress
	(in millions)	DERF				DEPR				CRC			Renewables			Other			Total
	ASSETS
	Current Assets
	Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	$	673			$	416			$	595		$	18		$	17		$	1,719
	Other	—				—				—			89			12			101
	Investments and Other Assets
	Other	—				—				—			29			51			80
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—				—				—			1,662			18			1,680
	Accumulated depreciation and amortization	—				—				—			(170		)	(5		)	(175		)
	Regulatory Assets and Deferred Debits
	Other	1				1				—			34			—			36
	Total assets	$	674			$	417			$	595		$	1,662		$	93		$	3,441
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—			$	—			$	—		$	2		$	—		$	2
	Taxes accrued	—				—				—			10			—			10
	Current maturities of long-term debt	—				—				—			66			14			80
	Other	—				—				—			17			10			27
	Long-term Debt(b)	400				300				325			907			34			1,966
	Deferred Credits and Other Liabilities
	Deferred income taxes	—				—				—			290			—			290
	Asset retirement obligations	—				—				—			26			—			26
	Other	1				—				—			17			13			31
	Total liabilities	$	401			$	300			$	325		$	1,335		$	71		$	2,432
	Net assets of consolidated variable interest entities	$	273			$	117			$	270		$	327		$	22		$	1,009
	(a)    Restricted as collateral for non-recourse debt of VIEs.
	(b)    Non-recourse to the general assets of the applicable registrant.
Schedule Of Non-Consolidated VIEs	'
	The tables below show VIEs not consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		30-Jun-14
		Duke Energy											Duke Energy			Duke Energy
	(in millions)	Renewables				Other				Total			Ohio			Indiana
	Receivables	$	—			$	—			$	—		$	68		$	98
	Investments in equity method unconsolidated affiliates	152				26				178			—			—
	Investments and other assets	—				4				4			—			—
	Total assets	$	152			$	30			$	182		$	68		$	98
	Other current liabilities	$	—			$	3			$	3		$	—		$	—
	Deferred credits and other liabilities	—				14				14			—			—
	Total liabilities	$	—			$	17			$	17		$	—		$	—
	Net assets (liabilities)	$	152			$	13			$	165		$	68		$	98
		31-Dec-13
		Duke Energy											Duke Energy Ohio			Duke Energy Indiana
	(in millions)	Renewables				Other				Total
	Receivables	$	—			$	—			$	—		$	114		$	143
	Investments in equity method unconsolidated affiliates	153				60				213			—			—
	Intangibles, net	—				96				96			96			—
	Investments and other assets	—				4				4			—			—
	Total assets	$	153			$	160			$	313		$	210		$	143
	Other current liabilities	$	—			$	3			$	3		$	—		$	—
	Deferred credits and other liabilities	—				15				15			—			—
	Total liabilities	$	—			$	18			$	18		$	—		$	—
	Net assets	$	153			$	142			$	295		$	210		$	143
Duke Energy Ohio [Member]	'
Variable Interest Entities [Line Items]	'
CRC Fair Value Assumptions	'
	Key assumptions used in estimating fair value are detailed in the following table.
		Duke Energy Ohio						Duke Energy Indiana
		2014			2013			2014			2013
	Anticipated credit loss ratio	0.6	%		0.6	%		0.3	%		0.3	%
	Discount rate	1.2	%		1.2	%		1.2	%		1.2	%
	Receivable turnover rate	12.8	%		12.8	%		10.5	%		10.3	%
CRC Receivables Sold	'
	The following table shows the gross and net receivables sold.
		Duke Energy Ohio								Duke Energy Indiana
	(in millions)	June 30, 2014				December 31, 2013				June 30, 2014			December 31, 2013
	Receivables sold	$	236			$	290			$	311		$	340
	Less: Retained interests	68				114				98			143
	Net receivables sold	$	168			$	176			$	213		$	197
CRC Sales and Cash Flows	'
	The following tables show sales and cash flows related to receivables sold.
		Duke Energy Ohio														Duke Energy Indiana
		Three Months Ended June 30,								Six Months Ended June 30,						Three Months Ended June 30,						Six Months Ended June 30,
	(in millions)	2014				2013				2014			2013			2014			2013			2014			2013
	Sales
	Receivables sold	$	487			$	512			$	1,228		$	1,150		$	679		$	702		$	1,434		$	1,449
	Loss recognized on sale	(2		)		3				(6		)	6			(2		)	3			(5		)	6
	Cash flows
	Cash proceeds from receivables sold	544				539				1,267			1,156			713			721			1,474			1,446
	Collection fees received	1				1				1			1			1			1			1			1
	Return received on retained interests	1				2				3			3			1			1			3			3
Duke Energy Indiana [Member]	'
Variable Interest Entities [Line Items]	'
CRC Fair Value Assumptions	'
	Key assumptions used in estimating fair value are detailed in the following table.
		Duke Energy Ohio						Duke Energy Indiana
		2014			2013			2014			2013
	Anticipated credit loss ratio	0.6	%		0.6	%		0.3	%		0.3	%
	Discount rate	1.2	%		1.2	%		1.2	%		1.2	%
	Receivable turnover rate	12.8	%		12.8	%		10.5	%		10.3	%
CRC Receivables Sold	'
	The following table shows the gross and net receivables sold.
		Duke Energy Ohio								Duke Energy Indiana
	(in millions)	June 30, 2014				December 31, 2013				June 30, 2014			December 31, 2013
	Receivables sold	$	236			$	290			$	311		$	340
	Less: Retained interests	68				114				98			143
	Net receivables sold	$	168			$	176			$	213		$	197
CRC Sales and Cash Flows	'
	The following tables show sales and cash flows related to receivables sold.
		Duke Energy Ohio														Duke Energy Indiana
		Three Months Ended June 30,								Six Months Ended June 30,						Three Months Ended June 30,						Six Months Ended June 30,
	(in millions)	2014				2013				2014			2013			2014			2013			2014			2013
	Sales
	Receivables sold	$	487			$	512			$	1,228		$	1,150		$	679		$	702		$	1,434		$	1,449
	Loss recognized on sale	(2		)		3				(6		)	6			(2		)	3			(5		)	6
	Cash flows
	Cash proceeds from receivables sold	544				539				1,267			1,156			713			721			1,474			1,446
	Collection fees received	1				1				1			1			1			1			1			1
	Return received on retained interests	1				2				3			3			1			1			3			3

Common_Stock_Tables

Common Stock (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule Of Earnings Per Share	'
	The following table presents Duke Energy’s basic and diluted EPS calculations and reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding.
	(In millions, except per-share amounts)	Income		Average	EPS
				Shares
	Three Months Ended June 30, 2014
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	611	707	$	0.86
	Three Months Ended June 30, 2013
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	340	706	$	0.48
	(In millions, except per-share amounts)	Income		Average	EPS
				Shares
	Six Months Ended June 30, 2014
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic and diluted	$	516	707	$	0.73
	Six Months Ended June 30, 2013
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	969	705	$	1.37
	Effect of dilutive securities:
	Stock options, performance and restricted shares	—		1
	Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	969	706	$	1.37

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule Of Stock-Based Compensation Expense	'
	Duke Energy recorded pretax stock-based compensation expense as follows.
		Three Months Ended June 30,				Six Months Ended June 30,
	(in millions)	2014		2013		2014		2013
	Stock options	$	—	$	—	$	—	$	2
	Restricted stock unit awards	11		12		22		26
	Performance awards	5		7		10		18
	Total	$	16	$	19	$	32	$	46
	Tax benefit associated with stock-based compensation expense	$	6	$	8	$	12	$	18
	Stock-based compensation costs capitalized	1		1		2		2

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]	'
Employee Savings Plan Matching Contributions	'
	The following table includes pretax employer matching contributions, as well as the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan, made by Duke Energy and expensed by the Subsidiary Registrants.
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Three Months Ended June 30,
	2014	$	36		$	12		$	11		$	7		$	3		$	1		$	2
	2013	30			10			10			6			3			1			1
	Six Months Ended June 30,
	2014	$	80		$	26		$	23		$	16		$	7		$	2		$	4
	2013	71			24			22			12			7			2			3
Qualified Pension Plans [Member]	'
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, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	34		$	11		$	10		$	5		$	5		$	1		$	2
	Interest cost on projected benefit obligation	86			21			28			14			15			5			8
	Expected return on plan assets	(127		)	(33		)	(43		)	(22		)	(22		)	(6		)	(11		)
	Amortization of actuarial loss	37			9			17			8			8			1			3
	Amortization of prior service credit	(3		)	(2		)	(1		)	(1		)	(1		)	—			—
	Other	1			—			—			1			1			—			—
	Net periodic pension costs	$	28		$	6		$	11		$	5		$	6		$	1		$	2
		Three Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	42		$	13		$	15		$	6		$	7		$	1		$	3
	Interest cost on projected benefit obligation	80			20			29			12			14			6			7
	Expected return on plan assets	(137		)	(37		)	(49		)	(24		)	(22		)	(7		)	(11		)
	Amortization of actuarial loss	61			15			25			12			13			3			5
	Amortization of prior service credit	(3		)	(1		)	(1		)	—			(1		)	—			—
	Other	1			—			—			—			—			—			—
	Net periodic pension costs	$	44		$	10		$	19		$	6		$	11		$	3		$	4
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	68		$	21		$	20		$	10		$	10		$	2		$	4
	Interest cost on projected benefit obligation	172			42			56			27			29			10			15
	Expected return on plan assets	(255		)	(66		)	(86		)	(43		)	(43		)	(13		)	(20		)
	Amortization of actuarial loss	74			18			34			16			16			2			6
	Amortization of prior service credit	(7		)	(4		)	(2		)	(1		)	(1		)	—			—
	Other	3			1			1			1			1			—			—
	Net periodic pension costs	$	55		$	12		$	23		$	10		$	12		$	1		$	5
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	84		$	25		$	30		$	11		$	15		$	3		$	6
	Interest cost on projected benefit obligation	160			40			58			25			27			11			14
	Expected return on plan assets	(274		)	(74		)	(99		)	(47		)	(44		)	(15		)	(22		)
	Amortization of actuarial loss	122			30			50			23			25			6			11
	Amortization of prior service credit	(6		)	(3		)	(2		)	—			(1		)	—			—
	Other	3			1			1			—			—			—			—
	Net periodic pension costs	$	89		$	19		$	38		$	12		$	22		$	5		$	9
Non-Qualified Pension Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Components of Net Periodic Pension Costs	'
	The following tables include the components of net periodic pension costs for non-qualified pension plans for registrants with non-qualified pension costs.
		Three Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	—		$	—
	Interest cost on projected benefit obligation	3			—			—			—			1
	Amortization of actuarial loss	1			—			1			—			—
	Net periodic pension costs	$	5		$	—		$	2		$	—		$	1
		Three Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	—		$	—		$	—
	Interest cost on projected benefit obligation	3			1			2			1			1
	Amortization of actuarial loss	1			—			1			—			—
	Net periodic pension costs	$	5		$	1		$	3		$	1		$	1
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	—		$	—
	Interest cost on projected benefit obligation	7			—			2			1			1
	Amortization of actuarial loss	1			—			1			—			—
	Amortization of prior service credit	—			—			—			—			—
	Net periodic pension costs	$	9		$	—		$	4		$	1		$	1
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	—		$	—		$	—
	Interest cost on projected benefit obligation	7			1			4			1			1
	Amortization of actuarial loss	3			—			2			—			—
	Amortization of prior service credit	(1		)	—			(1		)	—			—
	Net periodic pension costs	$	10		$	1		$	5		$	1		$	1
Other Post-Retirement Benefit Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Components of Net Periodic Pension Costs	'
	The following tables include the components of net periodic other post-retirement benefit costs.
		Three Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	3		$	1		$	1		$	1		$	1		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	13			3			5			2			3			1			2
	Expected return on plan assets	(3		)	(2		)	—			—			—			—			(1		)
	Amortization of actuarial loss (gain)	10			—			11			8			3			(1		)	—
	Amortization of prior service credit	(32		)	(2		)	(23		)	(18		)	(6		)	—			—
	Net periodic other post-retirement benefit costs	$	(9	)	$	—		$	(6	)	$	(7	)	$	1		$	—		$	1
		Three Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	7		$	—		$	5		$	3		$	2		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	18			3			12			6			4			1			2
	Expected return on plan assets	(4		)	(2		)	—			—			—			—			—
	Amortization of actuarial loss (gain)	13			1			15			9			4			(1		)	—
	Amortization of prior service credit	(3		)	(2		)	(1		)	(1		)	—			—			—
	Net periodic other post-retirement benefit costs	$	31		$	—		$	31		$	17		$	10		$	—		$	2
		Six Months Ended June 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	5		$	1		$	2		$	1		$	2		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	25			6			11			5			6			1			3
	Expected return on plan assets	(6		)	(4		)	—			—			—			—			(1		)
	Amortization of actuarial loss (gain)	20			1			21			15			5			(1		)	—
	Amortization of prior service credit	(63		)	(5		)	(47		)	(36		)	(11		)	—			—
	Net periodic other post-retirement benefit costs	$	(19	)	$	(1	)	$	(13	)	$	(15	)	$	2		$	—		$	2
		Six Months Ended June 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
	Service cost	$	14		$	1		$	11		$	6		$	4		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	36			6			23			12			8			1			3
	Expected return on plan assets	(7		)	(5		)	—			—			—			—			—
	Amortization of actuarial loss (gain)	26			2			29			18			8			(1		)	—
	Amortization of prior service credit	(6		)	(4		)	(1		)	(1		)	—			—			—
	Net periodic other post-retirement benefit costs	$	63		$	—		$	62		$	35		$	20		$	—		$	3

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Summary of Effective Tax Rates	'
	The effective tax rates for each of the Duke Energy Registrants are included in the following table.
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Duke Energy	25.4	%	32.5	%	13.6	%	33.6	%
	Duke Energy Carolinas	28.9	%	37.4	%	33.6	%	37.2	%
	Progress Energy	37.7	%	59.9	%	37.4	%	36.7	%
	Duke Energy Progress	37.3	%	39.6	%	36.9	%	38.7	%
	Duke Energy Florida	38.7	%	38	%	38.6	%	39.8	%
	Duke Energy Ohio	36.2	%	36.3	%	35.5	%	35.9	%
	Duke Energy Indiana	36.9	%	37.5	%	36.8	%	37.5	%

Organization_and_Basis_of_Pres3

Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	$884	$937
Duke Energy Carolinas [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	326	323
Progress Energy [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	269	189
Duke Energy Progress [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	157	120
Duke Energy Florida [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	112	69
Duke Energy Ohio [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	0	55
Duke Energy Ohio [Member] | Cinergy Receivables [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	64	89
Duke Energy Indiana [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	27	5
Duke Energy Indiana [Member] | Cinergy Receivables [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	$102	$144

Organization_and_Basis_of_Pres4

Organization and Basis of Presentation Organization and Basis of Presentation (Schedule of Excise Taxes) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	$151	$142	$318	$291
Duke Energy Carolinas [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	43	37	89	78
Progress Energy [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	74	73	151	141
Duke Energy Progress [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	24	27	56	55
Duke Energy Florida [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	50	46	95	86
Duke Energy Ohio [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	25	24	59	55
Duke Energy Indiana [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	$9	$8	$19	$17

Acquisitions_and_Dispositions_1

Acquisitions and Dispositions (Narrative) (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2016

Midwest Generation Business [Member]

Midwest Generation Business [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Scenario Forecast [Member]

Midwest Generation Business [Member]

Midwest Generation Business [Member]

Duke Energy Progress [Member]

NCEMPA Generating Assets [Member]

Significant Acquisitions and Disposals [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment charges

$6,000,000

$386,000,000

$1,388,000,000

$386,000,000

'

$1,402,000,000

$21,000,000

'

$1,438,000,000

'

'

$1,438,000,000

($18,000,000)

$22,000,000

($18,000,000)

$22,000,000

'

Avoided Depreciation on Assets Held for Sale

'

'

'

'

42,000,000

42,000,000

'

'

'

'

42,000,000

42,000,000

'

'

'

'

'

Payments to acquire businesses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,200,000,000

Acquisitions_and_Dispositions_2

Acquisitions and Dispositions (Plants in Disposal Group) (Details) (Duke Energy Ohio [Member])	6 Months Ended
	Jun. 30, 2014
	MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	9,469	[1]
Owned Average MW Capacity	6,090	[1]
Stuart [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	2,318	[1],[2],[3]
Owned Average MW Capacity	904	[1],[2],[3]
Ownership Interest	39.00%	[2],[3]
Zimmer [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	1,338	[1],[2]
Owned Average MW Capacity	622	[1],[2]
Ownership Interest	46.50%	[2]
Hanging Rock [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	1,274	[1]
Owned Average MW Capacity	1,274	[1]
Ownership Interest	100.00%
Miami Fort Units 7 and 8 [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	1,020	[1],[2]
Owned Average MW Capacity	653	[1],[2]
Ownership Interest	64.00%	[2]
Conesville [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	780	[1],[2],[3]
Owned Average MW Capacity	312	[1],[2],[3]
Ownership Interest	40.00%	[2],[3]
Washington [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	637	[1]
Owned Average MW Capacity	637	[1]
Ownership Interest	100.00%
Fayette [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	640	[1]
Owned Average MW Capacity	640	[1]
Ownership Interest	100.00%
Killen [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	618	[1],[2],[3]
Owned Average MW Capacity	204	[1],[2],[3]
Ownership Interest	33.00%	[2],[3]
Lee [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	640	[1]
Owned Average MW Capacity	640	[1]
Ownership Interest	100.00%
Dicks Creek [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	136	[1]
Owned Average MW Capacity	136	[1]
Ownership Interest	100.00%
Miami Fort [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total Average MW Capacity	68	[1]
Owned Average MW Capacity	68	[1]
Ownership Interest	100.00%
[1]	Average MW capacity is calculated as the average of winter capacity and summer capacity.
[2]	Jointly owned with Ohio Power Company and/or The Dayton Power & Light Company.
[3]	Station is not operated by Duke Energy Ohio.

Acquisitions_and_Dispositions_3

Acquisitions and Dispositions (Assets Held For Sale) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Current assets	$409	'
Current liabilities	271	7
Duke Energy Ohio [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Current assets	359	'
Current liabilities	257	'
Midwest Generation Business [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Current assets	409	'
Investments and other assets	42	'
Property, plant and equipment	2,153	'
Total assets held for sale	2,604	'
Current liabilities	271	'
Deferred credits and other liabilities	75	'
Total liabilities associated with assets held for sale	346	'
Midwest Generation Business [Member] | Duke Energy Ohio [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Current assets	359	'
Investments and other assets	37	'
Property, plant and equipment	2,116	'
Total assets held for sale	2,512	'
Current liabilities	257	'
Deferred credits and other liabilities	74	'
Total liabilities associated with assets held for sale	$331	'

Business_Segments_Narrative_De

Business Segments (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	$413	$381	$819	$748
Progress Energy [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	167	160	336	358
Duke Energy Ohio [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	29	18	51	36
Other Segments [Member] | Progress Energy [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	$60	$70	$123	$171

Business_Segments_Business_Seg

Business Segments (Business Segment Data) (Details) (USD $)	3 Months Ended				6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	$5,949		$5,879		$12,573		$11,777		'
Segment income	612		342		518		976		'
Add back noncontrolling interests component	4		3		8		3		'
Loss from discontinued operations, net of tax	-3		-3		-6		-3		'
Net income (loss)	613		342		520		976		'
Segment assets	115,173		'		115,173		'		114,779
Income tax benefit	209		165		82		495		'
Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,949		5,879		12,573		11,777		'
Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	'		'		'		'		'
Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,283		4,920		11,088		9,980		'
Segment income	689		353	[1],[2],[3],[4]	1,426		1,009	[1],[3],[4],[5]	'
Segment assets	101,070		'		101,070		'		'
Regulated Utilities [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,272		4,911	[1],[2]	11,067		9,963	[1],[5]	'
Regulated Utilities [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	11		9		21		17		'
International Energy [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	364		406		746		798		'
Segment income	146		87		276		184		'
Segment assets	5,463		'		5,463		'		'
International Energy [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	364		406		746		798		'
International Energy [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	'		'		'		'		'
Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	309		557		758		1,009		'
Segment income	-120	[6]	41		-999	[7],[8]	-1		'
Segment assets	5,652		'		5,652		'		'
Commercial Power [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	304		547		746		986		'
Commercial Power [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5		10		12		23		'
Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,956		5,883		12,592		11,787		'
Segment income	715		481		703		1,192		'
Segment assets	112,185		'		112,185		'		'
Total Reportable Segments [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,940		5,864		12,559		11,747		'
Total Reportable Segments [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	16		19		33		40		'
Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	28		36		53		71		'
Segment income	-103	[9]	-139	[9]	-185	[9]	-216	[9]	'
Segment assets	2,807		'		2,807		'		'
Other [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	9		15		14		30		'
Other [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	19		21		39		41		'
Intersegment Eliminations [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-35		-40		-72		-81		'
Segment assets	181		'		181		'		'
Intersegment Eliminations [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	'		'		'		'		'
Intersegment Eliminations [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-35		-40		-72		-81		'
Duke Energy Ohio [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	531		811		1,294		1,558		'
Segment income	-107		58		-997		37		'
Segment assets	9,569		'		9,569		'		10,763
Income tax benefit	-62		33		-549		21		'
Duke Energy Ohio [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	531		811		1,294		1,558		'
Duke Energy Ohio [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	415		404		977		896		'
Segment income	52	[10]	27	[10]	116	[10]	80	[10]	'
Segment assets	7,203		'		7,203		'		'
Duke Energy Ohio [Member] | Regulated Utilities [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	415	[10]	404	[10]	977	[10]	896	[10]	'
Duke Energy Ohio [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	121		415		329		681		'
Segment income	-154	[11]	35		-1,105	[12],[7]	-33		'
Segment assets	2,818		'		2,818		'		'
Duke Energy Ohio [Member] | Commercial Power [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	116		407		317		662		'
Duke Energy Ohio [Member] | Commercial Power [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5		8		12		19		'
Duke Energy Ohio [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	536		819		1,306		1,577		'
Segment income	-102		62		-989		47		'
Segment assets	10,021		'		10,021		'		'
Duke Energy Ohio [Member] | Total Reportable Segments [Member] | Unaffiliated [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	531		811		1,294		1,558		'
Duke Energy Ohio [Member] | Total Reportable Segments [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5		8		12		19		'
Duke Energy Ohio [Member] | Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	'		'		'		'		'
Segment income	-5		-4		-8		-10		'
Segment assets	103		'		103		'		'
Duke Energy Ohio [Member] | Intersegment Eliminations [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-5		-8		-12		-19		'
Segment assets	-555		'		-555		'		'
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] | Intersegment [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-5		-8		-12		-19		'
Commodity Contracts [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Unrealized gain (loss) on commodity contracts	-136		'		-158		'		'
Income tax benefit	-77		'		-89		'		'
Commodity Contracts [Member] | Duke Energy Ohio [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Unrealized gain (loss) on commodity contracts	-148		'		-181		'		'
Income tax benefit	($84)		'		($101)		'		'
[1]	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
[2]	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates beginning in June 2013. This rate increase impacts Regulated Utilities.
[3]	Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at the Shearon Harris Nuclear Station (Harris) site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
[4]	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
[5]	In May 2013, the NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates in the first year beginning in June 2013. This rate increase impacts Regulated Utilities.
[6]	Commercial Power includes a mark-to-market loss of $136 million, net of a tax benefit of $77 million, on economic hedges of the input and output commodities related to its fossil generation assets.
[7]	Commercial Power includes an impairment charge related to the planned disposition of the Midwest Generation assets. See Note 2 for additional information.
[8]	Commercial Power includes a mark-to-market loss of $158 million, net of a tax benefit of $89 million, on economic hedges of the input and output commodities related to its fossil generation assets.
[9]	Other includes costs to achieve the Progress Energy merger.
[10]	In May 2013, the PUCO approved a settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This increase impacts Regulated Utilities.
[11]	Commercial Power includes an after-tax mark-to-market loss of $148 million, net of a tax benefit of $84 million, on economic hedges of the input and output commodities related to its fossil generation assets.
[12]	Commercial Power includes an after-tax mark-to-market loss of $181 million, net of a tax benefit of $101 million, on economic hedges of the input and output commodities related to its fossil generation assets.

Business_Segments_Net_Loss_Det

Business Segments (Net Loss) (Details) (USD $)	3 Months Ended				6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	$612		$342		$518		$976
Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-103	[1]	-139	[1]	-185	[1]	-216	[1]
Duke Energy Carolinas [Member] | Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-27		-25		-48		-43
Progress Energy [Member] | Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-45		-55		-97		-133
Duke Energy Progress [Member] | Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-3		-14		-13		-20
Duke Energy Florida [Member] | Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-7		-7		-11		-12
Duke Energy Indiana [Member] | Other Segments [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	($4)		($4)		($7)		($8)
[1]	Other includes costs to achieve the Progress Energy merger.

Regulatory_Matters_Narrative_D

Regulatory Matters (Narrative) (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

12 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 24, 2013

Sep. 24, 2013

Sep. 24, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

30-May-13

30-May-13

30-May-13

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Nov. 13, 2013

Nov. 13, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Rate Case [Member]

Rate Case Step One [Member]

Rate Case Step Two [Member]

William State Lee III Nuclear Station [Member]

William State Lee III Nuclear Station [Member]

Rate Case [Member]

Rate Case Step One [Member]

Rate Case Step Two [Member]

FERC Mitigation [Member]

Shearon Harris Nuclear Station [Member]

Shearon Harris Nuclear Station [Member]

Removal Costs [Member]

Removal Costs [Member]

2013 FPSC Settlement Agreement [Member]

Crystal River Unit 3 [Member]

Crystal River Unit 3 [Member]

Crystal River Unit 3 [Member]

Crystal River Unit 3 [Member]

Crystal River Unit 3 [Member]

Levy Nuclear Station [Member]

Levy Nuclear Station [Member]

Citrus County Station [Member]

Suwannee Station [Member]

Hines Energy Complex [Member]

MGP Remidiation [Member]

Natural Gas Rate Case [Member]

RTO Realignment [Member]

RTO Realignment [Member]

RTO Realignment [Member]

Regional Transmission Organization [Member]

Edwardsport IGCC Plant [Member]

Edwardsport IGCC Plant [Member]

NCUC [Member]

NCUC [Member]

NCUC [Member]

NCEMC [Member]

NCUC [Member]

NCUC [Member]

NCUC [Member]

New Generation Needs [Member]

Amount Subject To Cost Cap [Member]

Uprate and ISFSI Projects [Member]

2013 FPSC Settlement Agreement [Member]

2013 FPSC Settlement Agreement [Member]

2013 FPSC Settlement Agreement [Member]

PUCO [Member]

PUCO [Member]

Edwardsport Event November 20, 2007 [Member]

Edwardsport Event December 27, 2012 [Member]

Public Utilities, General Disclosures [Line Items]

'

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'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Approved rate increase amount by state commission

'

'

'

'

'

'

'

'

'

$204,000,000

$30,000,000

'

'

'

'

'

'

'

'

$147,000,000

$31,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$56,000,000

'

'

'

'

'

'

'

'

'

Approved percentage rate increase by state commission

'

'

'

'

'

'

'

'

'

4.50%

0.60%

'

'

'

'

'

'

'

'

4.50%

1.00%

'

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'

'

'

'

'

'

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'

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'

'

'

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'

'

'

'

'

'

'

Approved return on equity percentage amount by state commission

'

'

'

'

'

'

'

'

10.20%

'

'

'

'

'

'

'

'

'

10.20%

'

'

'

'

'

'

'

'

'

'

'

'

10.50%

'

'

'

'

7.35%

'

'

'

'

'

'

'

'

'

'

'

9.84%

'

'

'

'

'

'

'

'

Rate increase begin date

'

'

'

'

'

'

'

'

25-Sep-13

'

'

'

'

'

'

'

'

'

1-Jun-13

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Approved equity capital structure, percentage

'

'

'

'

'

'

'

'

53.00%

'

'

'

'

'

'

'

'

'

53.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint owner ownership percentage

'

'

'

'

'

'

'

'

'

'

'

'

13.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment charges

6,000,000

386,000,000

1,388,000,000

386,000,000

'

3,000,000

3,000,000

'

'

'

'

'

'

-18,000,000

22,000,000

-18,000,000

22,000,000

'

'

'

'

-18,000,000

22,000,000

'

'

345,000,000

1,000,000

345,000,000

'

'

'

'

'

'

'

295,000,000

'

'

65,000,000

'

'

'

21,000,000

'

1,438,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Regulatory assets, non current

9,009,000,000

'

9,009,000,000

'

9,191,000,000

1,509,000,000

1,509,000,000

1,527,000,000

'

'

'

'

'

1,428,000,000

'

1,428,000,000

'

1,384,000,000

'

'

'

'

'

48,000,000

2,609,000,000

'

2,609,000,000

'

2,729,000,000

'

'

'

'

1,337,000,000

281,000,000

'

'

18,000,000

'

'

'

'

461,000,000

'

461,000,000

'

471,000,000

'

'

'

'

'

74,000,000

669,000,000

717,000,000

'

'

Regulatory assets, current

1,349,000,000

'

1,349,000,000

'

895,000,000

388,000,000

388,000,000

295,000,000

'

'

'

'

'

369,000,000

'

369,000,000

'

127,000,000

'

'

'

'

'

'

273,000,000

'

273,000,000

'

221,000,000

'

'

'

'

'

'

'

'

95,000,000

'

'

'

'

71,000,000

'

71,000,000

'

57,000,000

'

'

'

'

'

'

173,000,000

118,000,000

'

'

Amount of reduction to carrying amount of regulatory liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,000,000

73,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Decommissioning cost study estimate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acceleration of cash recovery through fuel clause

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

130,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost Cap for customers

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,466,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,595,000,000

Net unrecovered investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

233,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring Reserve

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

94,000,000

95,000,000

'

'

'

'

'

Net property, plant and equipment

66,908,000,000

'

66,908,000,000

'

69,490,000,000

23,341,000,000

23,341,000,000

23,012,000,000

'

'

'

'

'

13,810,000,000

'

13,810,000,000

'

13,650,000,000

'

'

'

'

'

'

9,722,000,000

'

9,722,000,000

'

9,611,000,000

'

'

'

'

'

'

'

'

120,000,000

'

'

'

'

4,868,000,000

'

4,868,000,000

'

8,235,000,000

'

'

'

'

'

'

8,668,000,000

8,576,000,000

'

'

MISO estimate of Duke Energy Ohio's MVP obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,700,000,000

'

'

'

'

'

'

'

Estimated capital cost of new utility plant, including AFUDC

'

'

'

'

'

'

'

'

'

'

'

$600,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,500,000,000

$197,000,000

$160,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,985,000,000

'

Regulatory_Matters_Refunds_Det

Regulatory Matters (Refunds) (Details) (Duke Energy Florida [Member], USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Florida Public Service Commission Settlement Agreement 2012 [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	$288
Refunded to date	199
2014	69
2015	10
2016	10
Retirement Decision Credits [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	100
Refunded to date	'
2014	'
2015	40
2016	60
Neil Settlement [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	490
Refunded to date	408
2014	82
2015	'
2016	'
Total Customer Refunds [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	878
Refunded to date	607
2014	151
2015	50
2016	70
Accelerated Regulatory Asset Recovery [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	-130
Refunded to date	-17
2014	-20
2015	-37
2016	-56
Net Customer Refunds [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	748
Refunded to date	590
2014	131
2015	13
2016	$14

Regulatory_Matters_Schedule_of

Regulatory Matters (Schedule of MISO Exit fees)(Details) (Duke Energy Ohio [Member], RTO Realignment [Member], USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Duke Energy Ohio [Member] | RTO Realignment [Member]	'
Restructuring Reserve [Roll Forward]	'
Balance, beginning of period	$95
Provision / Adjustments	1
Cash Reductions	-2
Balance, end of period	$94

Regulatory_Matters_Schedule_of1

Regulatory Matters (Schedule of Net Carrying Value Of Facilities As Well As the Remaining Non-current Regulatory Assets) (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
	MW
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	2,297		'
Remaining net book value (in millions)	$66,908		$69,490
Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	253	[1]	'
Duke Energy Carolinas [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	200	[2]	'
Remaining net book value (in millions)	23,341		23,012
Duke Energy Carolinas [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	13	[1],[2]	'
Progress Energy [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	873		'
Remaining net book value (in millions)	23,536		23,382
Progress Energy [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	111	[1]	'
Duke Energy Florida [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	873	[3]	'
Remaining net book value (in millions)	9,722		9,611
Duke Energy Florida [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	111	[1],[3]	'
Duke Energy Ohio [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	556	[4]	'
Remaining net book value (in millions)	4,868		8,235
Duke Energy Ohio [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	9	[1],[4]	'
Duke Energy Indiana [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	668	[5]	'
Remaining net book value (in millions)	8,668		8,576
Duke Energy Indiana [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	$120	[1],[5]	'
[1]	Included in Property, plant and equipment, net as of JuneB 30, 2014, on the Condensed Consolidated Balance Sheets.
[2]	Includes Lee Units 1 and 2. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. Duke Energy Carolinas expects to retire or convert these units by December 2020 in conjunction with a settlement agreement associated with the Cliffside Unit 6 air permit.
[3]	Includes Crystal River Units 1 and 2.
[4]	Includes Beckjord Units 5 and 6 and Miami Fort Unit 6. Beckjord units have no remaining book value.
[5]	Includes Wabash River Units 2 through 6. Wabash River Unit 6 is being evaluated for potential conversion to gas. Duke Energy Indiana committed to retire or convert these units by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit.

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Details) (USD $)

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Feb. 21, 2014

Feb. 21, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Oct. 03, 2012

Dec. 31, 2009

Dec. 31, 2012

Jun. 30, 2014

Mar. 24, 2014

Jun. 30, 2014

Mar. 24, 2014

Mar. 31, 2014

Mar. 28, 2014

Jun. 30, 2014

Dec. 11, 2012

Brazil Expansion Lawsuit [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

North Carolina Ash Basins [Member]

North Carolina Ash Basins [Member]

North Carolina Ash Basins [Member]

New Source Review Provisions Of Clean Air Act [Member]

Asbestos Issue [Member]

Asbestos Issue [Member]

Asbestos Issue [Member]

Asbestos Issue [Member]

Synthetic Fuels [Member]

Synthetic Fuels [Member]

Synthetic Fuels [Member]

Spent Nuclear Fuels [Member]

Spent Nuclear Fuels [Member]

Westinghouse Electric Company Litigation [Member]

Westinghouse Electric Company Litigation [Member]

Edwardsport IGCC Plant [Member]

Dan River Steam Station [Member]

Minimum [Member]

Maximum [Member]

Malignant Asbestos Claim [Member]

Non Malignant Asbestos Claim [Member]

Dan River Steam Station [Member]

Dan River Steam Station [Member]

Claims

Claims

T

gal

gal

T

Valuation and Qualifying Accounts [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Coal ash released, in tons

'

'

'

'

30,000

39,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basin water released, in gallons

'

'

'

'

24,000,000

27,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Environmental remediation expense

'

'

'

$20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Obligation to expand installed generation capacity, percent

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum civil penalties per day for each violation

'

'

'

'

'

'

37,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss contingency, pending claims, number

'

'

'

'

'

'

'

'

'

35

90

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos-related injuries and damages reserves

'

'

'

'

'

'

'

600,000,000

616,000,000

12,000,000

19,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Reinsurance retention policy, amount retained

'

'

'

'

'

'

'

476,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reinsurance retention policy, excess retention, amount reinsured

'

'

'

'

'

'

'

897,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Probable insurance recoveries

'

'

'

'

'

'

'

649,000,000

649,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss contingency, damages paid, value

'

'

'

'

'

'

'

'

'

'

'

'

'

154,000,000

'

'

'

'

'

'

'

'

'

Damages awarded to plaintiff

'

'

'

'

'

'

'

'

'

'

'

'

90,000,000

'

'

'

'

'

'

'

'

'

'

Gain recognized in period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

63,000,000

'

'

'

'

'

'

'

'

Loss contingency, damages sought, value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

510,000,000

'

'

'

Loss contingency, range of possible loss, portion not acccrued

90,000,000

'

25,000,000

'

'

'

'

'

'

'

'

9,000,000

'

'

'

2,000,000

'

7,000,000

'

'

'

5,000,000

'

Gain contingency, unrecorded amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$83,000,000

'

$21,000,000

'

$54,000,000

'

$560,000,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	$79	$75
Provisions / adjustments	9	4
Cash reductions	-6	-12
Ending balance	82	67
Loss contingency, range of possible loss, portion not acccrued	90	'
Duke Energy Carolinas [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	11	12
Provisions / adjustments	-1	'
Cash reductions	'	'
Ending balance	10	12
Loss contingency, range of possible loss, portion not acccrued	25	'
Progress Energy [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	27	33
Provisions / adjustments	4	4
Cash reductions	-4	-3
Ending balance	27	34
Loss contingency, range of possible loss, portion not acccrued	9	'
Duke Energy Progress [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	8	14
Provisions / adjustments	3	1
Cash reductions	-2	-1
Ending balance	9	14
Loss contingency, range of possible loss, portion not acccrued	2	'
Duke Energy Florida [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	19	19
Provisions / adjustments	1	3
Cash reductions	-2	-2
Ending balance	18	20
Loss contingency, range of possible loss, portion not acccrued	7	'
Duke Energy Ohio [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	27	15
Provisions / adjustments	5	-1
Cash reductions	-1	-6
Ending balance	31	8
Loss contingency, range of possible loss, portion not acccrued	51	'
Duke Energy Indiana [Member]	'	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	7	8
Provisions / adjustments	'	1
Cash reductions	'	-2
Ending balance	7	7
Loss contingency, range of possible loss, portion not acccrued	$5	'

Commitments_and_Contingencies_3

Commitments and Contingencies (Schedule of Reserves) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	$197	$204
Progress Energy [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	73	78
Duke Energy Progress [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	10	10
Duke Energy Florida [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	$42	$43

Commitments_and_Contingencies_4

Commitments and Contingencies Commitments and Contingencies (North Carolina Ash Basins) (Details) (North Carolina Ash Basins [Member], USD $)	Jun. 30, 2014
In Billions, unless otherwise specified
Minimum [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Minimum	$2	[1]
Minimum [Member] | Baseline Assumptions [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Minimum	2	[2]
Minimum [Member] | Estimated Additional Costs Related To Full Excavation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Minimum	4	[3]
Minimum [Member] | Estimated Additional Costs Related to All Dry Systems [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Minimum	1	[4]
Maximum [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Maximum	10	[1]
Maximum [Member] | Baseline Assumptions [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Maximum	2.5	[2]
Maximum [Member] | Estimated Additional Costs Related To Full Excavation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Maximum	5.5	[3]
Maximum [Member] | Estimated Additional Costs Related to All Dry Systems [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Range of Possible Loss, Maximum	$2	[4]
Duke Energy Carolinas [Member]	'
Loss Contingencies [Line Items]	'
Estimated Allocation of Remediation Costs	65.00%
Duke Energy Progress [Member]	'
Loss Contingencies [Line Items]	'
Estimated Allocation of Remediation Costs	35.00%
[1]	On average, the allocation of these estimates is approximately 65 percent to Duke Energy Carolinas and 35 percent to Duke Energy Progress. However, this allocation could vary significantly based on site-specific compliance actions.
[2]	Assumes (i) hybrid cap in place closure for ash basins at ten coal plants, (ii) excavation and relocation of ash to lined structural fills or landfills for the retired Dan River, Riverbend and Sutton coal plants, (iii) dry fly ash conversion at the Asheville units and Cliffside Unit 5, (iv) continued structural fill disposal for the Asheville coal plant, and (v) dry bottom ash handling conversions and fly ash reliability improvements. Includes costs for actions noted in the March 12, 2014 letter to the governor of North Carolina and existing plans to close ash basins.
[3]	Represents estimated additional costs to excavate and relocate ash to lined landfills for the ten plants under hybrid cap in place closure in the baseline assumptions.
[4]	Represents estimated additional costs to convert all active coal plants to all-dry pneumatic bottom ash handling systems and thermally-driven evaporation of other process water.

Debt_and_Credit_Facilities_Nar

Debt and Credit Facilities (Narrative) (Details) (USD $)	6 Months Ended
In Billions, unless otherwise specified	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Facility size	$6
Line of credit facility, affiliated borrower	'The Subsidiary Registrants, excluding Progress Energy each have borrowing capacity under the master credit facility up to specified sublimits 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.

Debt_and_Credit_Facilities_Sum

Debt and Credit Facilities (Summary of Debt Issuances) (Details) (USD $)

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 01, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2014

April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member]

April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member]

June 2014 10.700% Senior Unsecured Floating Notes Maturing May 2019 [Member]

June 2014 13.900% Senior Unsecured Floating Notes Maturing May 2021 [Member]

March 2014 0.854% Secured Credit Facility Maturing March 2017 [Member]

March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member]

March 2014 0.430% First Mortgage Bonds Maturing March 2017 [Member]

Parent Company [Member]

Parent Company [Member]

Parent Company [Member]

Parent Company [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Ohio [Member]

International Energy [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Secured Debt [Member]

First Mortgage Bonds [Member]

First Mortgage Bonds [Member]

Unsecured Debt [Member]

April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member]

April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member]

March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member]

March 2014 0.430% First Mortgage Bonds Maturing March 2017 [Member]

March 2014 0.854% Secured Credit Facility Maturing March 2017 [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

First Mortgage Bonds [Member]

First Mortgage Bonds [Member]

Secured Debt [Member]

Subsequent Event [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$402,000,000

$196,000,000

Debt issuance date

'

1-Apr-14

1-Apr-14

1-Jun-14

1-Jun-14

1-Mar-14

1-Mar-14

1-Mar-14

'

'

1-Apr-14

1-Apr-14

'

1-Mar-14

1-Mar-14

'

1-Mar-14

'

'

Debt maturity date

'

30-Apr-24

30-Apr-17

31-May-19

31-May-21

31-Mar-17

31-Mar-44

31-Mar-17

'

'

30-Apr-24

30-Apr-17

'

31-Mar-44

31-Mar-17

'

31-Mar-17

'

'

Interest rate

'

3.75%

0.61%

10.70%

13.90%

0.85%

4.38%

0.43%

'

'

3.75%

0.61%

'

4.38%

0.43%

'

0.85%

'

'

Debt issuances

$2,093,000,000

$600,000,000

[1]

$400,000,000

[1]

$108,000,000

[2]

$110,000,000

[2]

$225,000,000

[3]

$400,000,000

[4]

$250,000,000

[4]

$1,000,000,000

$1,000,000,000

$600,000,000

[1]

$400,000,000

[1]

$650,000,000

$400,000,000

[4]

$250,000,000

[4]

$225,000,000

$225,000,000

[3]

'

'

[1]

Proceeds were used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes. See Note 8 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.

[2]

Proceeds will be used to repay $196 million of current maturities for International Energy and for general corporate purposes.

[3]

Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Florida. Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes. See Note 12 for further details.

[4]

Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.

Debt_and_Credit_Facilities_Sch

Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Line of Credit Facility [Line Items]	'
Facility size	$6,000
Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	6,000	[1]
Notes payable and commercial paper	-1,409	[2]
Outstanding letters of credit	-64
Tax exempt bonds	-156
Available capacity	4,371
Parent Company [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	2,250	[1]
Notes payable and commercial paper	-873	[2]
Outstanding letters of credit	-57
Tax exempt bonds	0
Available capacity	1,320
Parent Company [Member] | Proceeds Loaned To Subsidiary Registrants [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Notes payable and commercial paper	-450
Duke Energy Carolinas [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	1,000	[1]
Notes payable and commercial paper	-300	[2]
Outstanding letters of credit	-4
Tax exempt bonds	-75
Available capacity	621
Duke Energy Progress [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	750	[1]
Notes payable and commercial paper	-75
Outstanding letters of credit	-2
Tax exempt bonds	0
Available capacity	673
Duke Energy Florida [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	650	[1]
Notes payable and commercial paper	0
Outstanding letters of credit	-1
Tax exempt bonds	0
Available capacity	649
Duke Energy Ohio [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	650	[1]
Notes payable and commercial paper	-11
Outstanding letters of credit	0
Tax exempt bonds	0
Available capacity	639
Duke Energy Indiana [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	700	[1]
Notes payable and commercial paper	-150	[2]
Outstanding letters of credit	0
Tax exempt bonds	-81
Available capacity	$469
[1]	Represents the sublimit of each borrower at JuneB 30, 2014.
[2]	Duke Energy issued $450 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas and Duke Energy Indiana. The balances are classified within Long-term Debt in Duke Energy Carolinas' and Duke Energy Indianabs Condensed Consolidated Balance Sheets.

Debt_and_Credit_Facilities_Deb

Debt and Credit Facilities Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt)(Details) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

In Millions, unless otherwise specified

Unsecured Debt [Member]

Other Debt Obligations [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Parent Company [Member]

Parent Company [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

July 2014 Maturity 1 [Member]

First Mortgage Bonds [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

First Mortgage Bonds [Member]

April 2015 Maturity 1 [Member]

September 2014 Maturity [Member]

April 2015 Maturity 1 [Member]

March 2015 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Debt maturity date

'

'

31-Jul-14

'

'

'

30-Apr-15

30-Sep-14

30-Apr-15

'

'

31-Mar-15

Interest rate

'

'

15.37%

'

'

'

5.15%

3.95%

3.35%

'

'

0.37%

Current maturities of long-term debt

$1,887

$2,104

$196

$291

$306

$174

$300

$500

$450

$197

$47

$150

Goodwill_Details

Goodwill (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Goodwill [Roll Forward]	'	'
Goodwill	$17,214	$17,211
Accumulated impairment charges	-871	-871
Foreign exchange and other changes	3	'
Goodwill as adjusted for accumulated impairment charges	16,343	16,340
Regulated Utilities [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	15,950	15,950
Accumulated impairment charges	'	'
Foreign exchange and other changes	'	'
Goodwill as adjusted for accumulated impairment charges	15,950	15,950
International [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	329	326
Accumulated impairment charges	'	'
Foreign exchange and other changes	3	'
Goodwill as adjusted for accumulated impairment charges	329	326
Commercial Power [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	935	935
Accumulated impairment charges	-871	-871
Foreign exchange and other changes	'	'
Goodwill as adjusted for accumulated impairment charges	64	64
Duke Energy Ohio [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	2,324	2,324
Accumulated impairment charges	-1,404	-1,404
Goodwill as adjusted for accumulated impairment charges	920	920
Duke Energy Ohio [Member] | Regulated Utility [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	1,136	1,136
Accumulated impairment charges	-216	-216
Goodwill as adjusted for accumulated impairment charges	920	920
Duke Energy Ohio [Member] | DEO Commercial Power [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	1,188	1,188
Accumulated impairment charges	-1,188	-1,188
Goodwill as adjusted for accumulated impairment charges	$0	$0

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended				6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Duke Energy Carolinas [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	$217	[1]	$235	[1]	$439	[1]	$478	[1]
Duke Energy Carolinas [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	5	[2]	6	[2]	11	[2]	11	[2]
Duke Energy Carolinas [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	15	[3]	24	[3]	112	[3]	77	[3]
Related party transaction, expenses from transactions with related party	40	[3]	22	[3]	91	[3]	32	[3]
Progress Energy [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	'	[4]	22	[4]	'	[4]	50	[4]
Related party transaction, expenses from transactions with related party	200	[1]	111	[1]	378	[1]	273	[1]
Progress Energy [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	8	[2]	9	[2]	17	[2]	17	[2]
Progress Energy [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	40	[3]	22	[3]	91	[3]	32	[3]
Related party transaction, expenses from transactions with related party	15	[3]	24	[3]	112	[3]	77	[3]
Duke Energy Progress [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	104	[1]	66	[1]	200	[1]	162	[1]
Duke Energy Progress [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	4	[2]	5	[2]	9	[2]	10	[2]
Duke Energy Progress [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	40	[3]	22	[3]	91	[3]	32	[3]
Related party transaction, expenses from transactions with related party	15	[3]	24	[3]	112	[3]	77	[3]
Duke Energy Florida [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	97	[1]	45	[1]	178	[1]	111	[1]
Duke Energy Florida [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	4	[2]	4	[2]	8	[2]	7	[2]
Duke Energy Ohio [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	82	[1]	85	[1]	159	[1]	172	[1]
Duke Energy Ohio [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	3	[2]	4	[2]	6	[2]	8	[2]
Duke Energy Indiana [Member] | Corporate Governance And Shared Service Expenses [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	94	[1]	101	[1]	199	[1]	200	[1]
Duke Energy Indiana [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	$3	[2]	$3	[2]	$5	[2]	$5	[2]
[1]	The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These amounts are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.
[2]	The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energybs wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.
[3]	Effective with the consummation of the merger between Duke Energy and Progress Energy, Duke Energy Carolinas and Duke Energy Progress began to participate in a JDA which allowed the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power under the JDA are recorded in Operating Revenues on the Condensed Consolidated Statements of Operations and Comprehensive Income. Expenses from the purchase of power under the JDA are recorded in Fuel used in electric generation and purchased power on the Condensed Consolidated Statements of Operations and Comprehensive Income.
[4]	In 2013, Progress Energy Service Company (PESC), a consolidated subsidiary of Progress Energy, charged a proportionate share of corporate governance and other costs to consolidated affiliates of Duke Energy. Corporate governance and other shared costs were primarily related to human resources, employee benefits, legal and accounting fees, as well as other third-party costs. These charges were recorded as an offset to Operation, maintenance and other in the Condensed Consolidated Statements of Operations and Comprehensive Income. Effective January 1, 2014, PESC was contributed to Duke Energy Corporate Services (DECS), a consolidated subsidiary of Duke Energy, and these costs were no longer charged out of Progress Energy. Progress Energy recorded a non-cash after-tax equity transfer related to the contribution of PESC to DECS in its Condensed Consolidated Statements of Changes in Common Stockholder's Equity during the six months ended JuneB 30, 2014.

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Apr. 01, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

DECAM [Member]

Parent Company [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

MarkTo Market Of Commodity Contracts And Sales Of Power [Member]

MarkTo Market Of Commodity Contracts And Sales Of Power [Member]

MarkTo Market Of Commodity Contracts And Sales Of Power [Member]

MarkTo Market Of Commodity Contracts And Sales Of Power [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member]

April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member]

DECAM [Member]

DECAM [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Parent Company [Member]

Duke Energy Ohio [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

DECAM [Member]

DECAM [Member]

DECAM [Member]

DECAM [Member]

Parent Company [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related party transaction, expenses from transactions with related party

'

'

'

'

'

'

'

$27,000,000

$12,000,000

$81,000,000

$6,000,000

'

'

'

'

Intercompany loan payable

'

'

'

828,000,000

43,000,000

802,000,000

43,000,000

'

'

'

'

'

'

'

'

Debt issuances

2,093,000,000

'

1,000,000,000

'

'

'

'

'

'

'

'

1,000,000,000

'

400,000,000

[1]

400,000,000

[1]

Proceeds from Issuance of Debt

'

400,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from (Repayments of) Debt

'

'

'

'

'

'

'

'

'

'

'

'

$402,000,000

'

'

[1]

Proceeds were used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes. See Note 8 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.

Derivatives_and_Hedging_Narrat

Derivatives and Hedging (Narrative) (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]	'	'
Undesignated commodity contracts latest expiration year	'2018	'
Pretax deferred losses related to effective cash flow hedges	$57	$70
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	13	'
Progress Energy [Member]	'	'
Derivative [Line Items]	'	'
Pretax deferred losses related to effective cash flow hedges	$62	$63

Derivatives_and_Hedging_Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
	GWh		GWh
	dth		dth
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	41,147	[1]	71,466	[1]
Natural gas (millions of decatherms)	683,000,000		636,000,000
Duke Energy Carolinas [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	284	[1]	1,205	[1]
Natural gas (millions of decatherms)	'		'
Progress Energy [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	74	[1]	925	[1]
Natural gas (millions of decatherms)	323,000,000		363,000,000
Duke Energy Progress [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	74	[1]	925	[1]
Natural gas (millions of decatherms)	109,000,000		141,000,000
Duke Energy Florida [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	'	[1]	'	[1]
Natural gas (millions of decatherms)	214,000,000		222,000,000
Duke Energy Ohio [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	37,608	[1]	69,362	[1]
Natural gas (millions of decatherms)	360,000,000		274,000,000
Duke Energy Indiana [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	291	[1]	203	[1]
Natural gas (millions of decatherms)	'		'
[1]	Amounts at Duke Energy Ohio include intercompany positions that eliminate at Duke Energy.

Derivative_and_Hedging_Interes

Derivative and Hedging (Interest Rate Risk) (Details) (Interest Rate Contracts [Member], USD $)	Jun. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Derivative [Line Items]	'		'
Notional amount	$791		$832
Cash Flow Hedging [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	764	[1]	798	[1]
Duke Energy Ohio [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	27		27
Duke Energy Ohio [Member] | Cash Flow Hedging [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	'	[1]	'	[1]
Not Designated as Hedging Instrument [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	27		34
Not Designated as Hedging Instrument [Member] | Duke Energy Ohio [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	27		27
Variable Interest Entity, Primary Beneficiary [Member] | Cash Flow Hedging [Member]	'		'
Derivative [Line Items]	'		'
Notional amount	$552		$584
[1]	In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.

Derivatives_and_Hedging_Locati

Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	$797	$461
Location and fair value amounts of derivatives (Liability)	1,171	636
Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	506	214
Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	282	233
Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	715	322
Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	442	299
Designated As Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	16	27
Location and fair value amounts of derivatives (Liability)	35	23
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	16	27
Location and fair value amounts of derivatives (Liability)	'	'
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	15	18
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	19	4
Designated As Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	1	1
Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	781	434
Location and fair value amounts of derivatives (Liability)	1,136	613
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	1	1
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	5	4
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	62	201
Location and fair value amounts of derivatives (Liability)	4	158
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	12	'
Location and fair value amounts of derivatives (Liability)	3	'
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	11	215
Location and fair value amounts of derivatives (Liability)	1	131
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	12	'
Location and fair value amounts of derivatives (Liability)	4	'
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	16	13
Location and fair value amounts of derivatives (Liability)	134	153
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	416	'
Location and fair value amounts of derivatives (Liability)	563	'
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	4	5
Location and fair value amounts of derivatives (Liability)	57	166
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits and Other Liabilities Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	248	'
Location and fair value amounts of derivatives (Liability)	364	'
Progress Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	28	20
Location and fair value amounts of derivatives (Liability)	172	204
Progress Energy [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	21	15
Progress Energy [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	7	5
Progress Energy [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	125	107
Progress Energy [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	47	93
Progress Energy [Member] | Designated As Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	'	5
Progress Energy [Member] | Designated As Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	'	1
Progress Energy [Member] | Designated As Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	'	4
Progress Energy [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	28	20
Location and fair value amounts of derivatives (Liability)	172	199
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	5	3
Location and fair value amounts of derivatives (Liability)	4	2
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	2
Location and fair value amounts of derivatives (Liability)	1	1
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	17	11
Location and fair value amounts of derivatives (Liability)	120	105
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	4	4
Location and fair value amounts of derivatives (Liability)	47	91
Duke Energy Progress [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	13	6
Location and fair value amounts of derivatives (Liability)	74	71
Duke Energy Progress [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	11	3
Duke Energy Progress [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	3
Duke Energy Progress [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	57	41
Duke Energy Progress [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	17	30
Duke Energy Progress [Member] | Designated As Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Progress [Member] | Designated As Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	13	6
Location and fair value amounts of derivatives (Liability)	73	70
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	'
Location and fair value amounts of derivatives (Liability)	2	'
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	2
Location and fair value amounts of derivatives (Liability)	'	1
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	9	2
Location and fair value amounts of derivatives (Liability)	54	40
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	2
Location and fair value amounts of derivatives (Liability)	17	29
Duke Energy Florida [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	15	14
Location and fair value amounts of derivatives (Liability)	98	129
Duke Energy Florida [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	10	12
Duke Energy Florida [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	5	2
Duke Energy Florida [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	68	66
Duke Energy Florida [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	30	63
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	3
Location and fair value amounts of derivatives (Liability)	2	2
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	'
Location and fair value amounts of derivatives (Liability)	1	'
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	9	9
Location and fair value amounts of derivatives (Liability)	66	64
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	3	2
Location and fair value amounts of derivatives (Liability)	29	63
Duke Energy Ohio [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	841	391
Location and fair value amounts of derivatives (Liability)	1,117	390
Duke Energy Ohio [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	513	186
Duke Energy Ohio [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	328	205
Duke Energy Ohio [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	637	199
Duke Energy Ohio [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	480	186
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	841	391
Location and fair value amounts of derivatives (Liability)	1,117	390
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	'
Location and fair value amounts of derivatives (Liability)	5	4
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	186
Location and fair value amounts of derivatives (Liability)	'	163
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	11	'
Location and fair value amounts of derivatives (Liability)	2	'
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	202
Location and fair value amounts of derivatives (Liability)	'	130
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Investments And Other Assets, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	10	'
Location and fair value amounts of derivatives (Liability)	3	'
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	1
Location and fair value amounts of derivatives (Liability)	'	36
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	502	'
Location and fair value amounts of derivatives (Liability)	634	'
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	'	2
Location and fair value amounts of derivatives (Liability)	'	56
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Deferred Credits and Other Liabilities Assets Held For Sale [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	318	'
Location and fair value amounts of derivatives (Liability)	$472	'

Derivatives_and_Hedging_Schedu

Derivatives and Hedging (Schedule of Offsetting Assets and Liabilities: Derivatives and Collateral Posted) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Assets	'	'
Gross amounts recognized	$797	$461
Net amounts recognized on the Condensed Consolidated Balance Sheet	133	145
Derivative Liabilities	'	'
Gross amounts recognized	1,171	636
Net amounts recognized on the Condensed Consolidated Balance Sheet	507	321
Other Current Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	506	214
Gross amounts offset	-504	-179
Net amount subject to master netting	2	35
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	35
Other Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	282	233
Gross amounts offset	-277	-138
Net amount subject to master netting	5	95
Amounts not subject to master netting	9	14
Net amounts recognized on the Condensed Consolidated Balance Sheet	14	109
Other Current Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	715	322
Gross amounts offset	-576	-192
Net amount subject to master netting	139	130
Amounts not subject to master netting	6	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	145	134
Other Noncurrent Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	442	299
Gross amounts offset	-366	-155
Net amount subject to master netting	76	144
Amounts not subject to master netting	8	11
Net amounts recognized on the Condensed Consolidated Balance Sheet	84	155
Progress Energy [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	28	20
Net amounts recognized on the Condensed Consolidated Balance Sheet	3	3
Derivative Liabilities	'	'
Gross amounts recognized	172	204
Net amounts recognized on the Condensed Consolidated Balance Sheet	147	187
Progress Energy [Member] | Other Current Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	21	15
Gross amounts offset	-20	-13
Net amount subject to master netting	'	2
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	2
Progress Energy [Member] | Other Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	7	5
Gross amounts offset	-5	-4
Net amount subject to master netting	'	1
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	1
Progress Energy [Member] | Other Current Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	125	107
Gross amounts offset	-21	-17
Net amount subject to master netting	'	90
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	104	90
Progress Energy [Member] | Other Noncurrent Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	47	93
Gross amounts offset	-6	-10
Net amount subject to master netting	'	83
Amounts not subject to master netting	'	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	41	87
Duke Energy Progress [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	13	6
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	1
Derivative Liabilities	'	'
Gross amounts recognized	74	71
Net amounts recognized on the Condensed Consolidated Balance Sheet	62	66
Duke Energy Progress [Member] | Other Current Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	11	3
Gross amounts offset	-11	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	'
Duke Energy Progress [Member] | Other Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	2	3
Gross amounts offset	-1	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	'
Duke Energy Progress [Member] | Other Current Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	57	41
Gross amounts offset	-11	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	46	38
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	17	30
Gross amounts offset	-1	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	16	27
Duke Energy Florida [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	15	14
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	1
Derivative Liabilities	'	'
Gross amounts recognized	98	129
Net amounts recognized on the Condensed Consolidated Balance Sheet	85	116
Duke Energy Florida [Member] | Other Current Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	10	12
Gross amounts offset	-9	-10
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	2
Duke Energy Florida [Member] | Other Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	5	2
Gross amounts offset	-4	-2
Net amounts recognized on the Condensed Consolidated Balance Sheet	1	'
Duke Energy Florida [Member] | Other Current Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	68	66
Gross amounts offset	-10	-15
Net amounts recognized on the Condensed Consolidated Balance Sheet	58	51
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	30	63
Gross amounts offset	-5	-7
Net amounts recognized on the Condensed Consolidated Balance Sheet	25	56
Duke Energy Ohio [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	841	391
Net amounts recognized on the Condensed Consolidated Balance Sheet	18	96
Derivative Liabilities	'	'
Gross amounts recognized	1,117	390
Net amounts recognized on the Condensed Consolidated Balance Sheet	294	95
Duke Energy Ohio [Member] | Other Current Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	513	186
Gross amounts offset	-504	-165
Net amount subject to master netting	'	21
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	9	21
Duke Energy Ohio [Member] | Other Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Gross amounts recognized	328	205
Gross amounts offset	-322	-132
Net amount subject to master netting	'	73
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	6	73
Duke Energy Ohio [Member] | Other Current Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	637	199
Gross amounts offset	-574	-173
Net amount subject to master netting	'	26
Amounts not subject to master netting	'	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	63	27
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member]	'	'
Derivative Liabilities	'	'
Gross amounts recognized	480	186
Gross amounts offset	-410	-143
Net amount subject to master netting	'	43
Amounts not subject to master netting	'	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$70	$47

Derivatives_and_Hedging_Cash_F

Derivatives and Hedging (Cash Flow Hedges - Location and Amount of PreTax Recognized in Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest expense	($413)	($381)	($819)	($748)
Designated As Hedging Instrument [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Pretax Gains (Losses) Recorded in AOCI	-11	58	-9	72
Total Pretax Gains (Losses) Reclassified from AOCI into Earnings	-4	'	-5	-1
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax Gains (Losses) Recorded in AOCI	-11	58	-9	71
Interest expense	-4	'	-5	-1
Designated As Hedging Instrument [Member] | Commodity Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax Gains (Losses) Recorded in AOCI	'	'	'	1
Progress Energy [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest expense	-167	-160	-336	-358
Duke Energy Progress [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest expense	-58	-47	-115	-95
Duke Energy Florida [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest expense	-50	-43	-99	-92
Duke Energy Ohio [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest expense	($29)	($18)	($51)	($36)

Derivatives_and_Hedging_Undesi

Derivatives and Hedging (Undesignated Contracts - Location and Amount of PreTax Gains and (Losses) Recognized in Income or As Regulatory Assets or Liabilities) (Details) (Not Designated as Hedging Instrument [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	($269)	$22	($529)	($117)
Pretax gains (losses) recognized as regulatory assets or liabilities	13	-75	42	38
Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	1	-110	-1	-5
Commodity Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-28	9	-1	4
Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	3	1	-1	7
Commodity Contracts [Member] | Revenue Non Regulated Electric Natural Gas And Other [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-221	74	-618	-8
Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-21	-37	-14	-89
Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Non Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-25	-11	113	-18
Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	12	26	16	39
Interest Rate Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	28	'	28	'
Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-5	-5	-9	-9
Progress Energy [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	-15	-41	-15	-91
Pretax gains (losses) recognized as regulatory assets or liabilities	14	-104	16	6
Progress Energy [Member] | Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	2	-108	'	-3
Progress Energy [Member] | Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	2	1	-1	7
Progress Energy [Member] | Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-21	-37	-14	-89
Progress Energy [Member] | Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	12	4	16	9
Progress Energy [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - interest	4	-5	'	-9
Duke Energy Progress [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	-11	-14	-10	-28
Pretax gains (losses) recognized as regulatory assets or liabilities	20	-39	40	'
Duke Energy Progress [Member] | Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	23	-43	40	-7
Duke Energy Progress [Member] | Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	2	1	-1	7
Duke Energy Progress [Member] | Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-16	-12	-9	-29
Duke Energy Progress [Member] | Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-3	4	'	7
Duke Energy Progress [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - interest	3	-3	'	-6
Duke Energy Florida [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	-5	-26	-6	-62
Pretax gains (losses) recognized as regulatory assets or liabilities	-6	-65	-24	5
Duke Energy Florida [Member] | Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-5	-66	-24	3
Duke Energy Florida [Member] | Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	'	'	'	'
Duke Energy Florida [Member] | Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-6	-25	-6	-60
Duke Energy Florida [Member] | Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-1	1	'	2
Duke Energy Florida [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - interest	1	-1	'	-2
Duke Energy Ohio [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	-274	66	-585	-32
Pretax gains (losses) recognized as regulatory assets or liabilities	3	2	5	3
Duke Energy Ohio [Member] | Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	'	'	-1	'
Duke Energy Ohio [Member] | Commodity Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-3	'	'	'
Duke Energy Ohio [Member] | Commodity Contracts [Member] | Revenue Non Regulated Electric Natural Gas And Other [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-248	78	-697	-13
Duke Energy Ohio [Member] | Commodity Contracts [Member] | Fuel Used In Electric Generation And Purchased Power Regulated [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-25	-11	113	-18
Duke Energy Ohio [Member] | Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	'	2	'	3
Duke Energy Ohio [Member] | Interest Rate Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	6	'	6	'
Duke Energy Ohio [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - interest	($1)	($1)	($1)	($1)

Derivatives_and_Hedging_Deriva

Derivatives and Hedging (Derivative Instruments That Contain Credit-Risk Related Contingent Features and Cash Collateral) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features	'	'
Aggregate fair value amounts of derivative instruments in a net liability position	$911	$525
Fair value of collateral already posted	276	135
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	76	205
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	161	30
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	'	'
Derivative, collateral, right to reclaim cash - not offset against net derivative	115	122
Derivative, collateral, obligation to return cash - not offset against net derivative	'	'
Progress Energy [Member]	'	'
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features	'	'
Aggregate fair value amounts of derivative instruments in a net liability position	13	168
Fair value of collateral already posted	2	10
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	11	158
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	2	10
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	'	'
Duke Energy Progress [Member]	'	'
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features	'	'
Aggregate fair value amounts of derivative instruments in a net liability position	4	60
Fair value of collateral already posted	'	'
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	4	60
Duke Energy Florida [Member]	'	'
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features	'	'
Aggregate fair value amounts of derivative instruments in a net liability position	9	108
Fair value of collateral already posted	2	10
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	7	98
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	2	10
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	'	'
Duke Energy Ohio [Member]	'	'
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features	'	'
Aggregate fair value amounts of derivative instruments in a net liability position	911	355
Fair value of collateral already posted	266	125
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	80	47
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	158	19
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	'	'
Derivative, collateral, right to reclaim cash - not offset against net derivative	108	115
Derivative, collateral, obligation to return cash - not offset against net derivative	'	'
Duke Energy Indiana [Member]	'	'
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	'	1
Derivative, collateral, right to reclaim cash - not offset against net derivative	'	1
Derivative, collateral, obligation to return cash - not offset against net derivative	'	'

Investments_in_Debt_and_Equity2

Investments in Debt and Equity Securities (Narrative) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Trading Securities	$7	$18
Short-term investments	'	$44

Investments_in_Debt_and_Equity3

Investments in Debt and Equity Securities (Available-For-Sale Investments) (Details) (USD $)	6 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	$2,085		$1,884
Gross Unrealized Holding Losses	28		47
Estimated Fair Value	5,806		5,551
Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	2,044		1,852
Gross Unrealized Holding Losses	21		36
Estimated Fair Value	5,421		5,133
Ndtf [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	70		110
Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	2,007		1,813
Gross Unrealized Holding Losses	14		10
Estimated Fair Value	3,873		3,579
Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	17		8
Gross Unrealized Holding Losses	2		6
Estimated Fair Value	492		400
Ndtf [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	5		2
Gross Unrealized Holding Losses	1		6
Estimated Fair Value	144		160
Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	14		7
Gross Unrealized Holding Losses	3		12
Estimated Fair Value	700		730
Ndtf [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1		22
Gross Unrealized Holding Losses	1		2
Estimated Fair Value	142		154
Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	41	[1]	32	[1]
Gross Unrealized Holding Losses	7	[1]	11	[1]
Estimated Fair Value	385	[1]	418	[1]
Other Classification [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	17		21
Other Classification [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	34		29
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	97		91
Other Classification [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	2		1
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	66		99
Other Classification [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	4		2
Gross Unrealized Holding Losses	1		2
Estimated Fair Value	82		79
Other Classification [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	13		17
Other Classification [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1		'
Gross Unrealized Holding Losses	6		8
Estimated Fair Value	110		111
Duke Energy Carolinas [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,101		1,004
Gross Unrealized Holding Losses	13		23
Estimated Fair Value	3,002		2,837
Duke Energy Carolinas [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,101		1,004
Gross Unrealized Holding Losses	12		22
Estimated Fair Value	2,999		2,834
Duke Energy Carolinas [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	33		42
Duke Energy Carolinas [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,085		974
Gross Unrealized Holding Losses	8		6
Estimated Fair Value	2,156		1,964
Duke Energy Carolinas [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	10		5
Gross Unrealized Holding Losses	2		5
Estimated Fair Value	343		274
Duke Energy Carolinas [Member] | Ndtf [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1		'
Gross Unrealized Holding Losses	'		2
Estimated Fair Value	36		54
Duke Energy Carolinas [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	5		3
Gross Unrealized Holding Losses	1		7
Estimated Fair Value	306		354
Duke Energy Carolinas [Member] | Ndtf [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		22
Gross Unrealized Holding Losses	1		2
Estimated Fair Value	125		146
Duke Energy Carolinas [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'	[1]
Gross Unrealized Holding Losses	1	[1]	1	[1]
Estimated Fair Value	3	[1]	3	[1]
Duke Energy Carolinas [Member] | Other Classification [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	1		1
Estimated Fair Value	3		3
Progress Energy [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	946		849
Gross Unrealized Holding Losses	9		14
Estimated Fair Value	2,480		2,358
Progress Energy [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	943		848
Gross Unrealized Holding Losses	9		14
Estimated Fair Value	2,422		2,299
Progress Energy [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	37		68
Progress Energy [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	922		839
Gross Unrealized Holding Losses	6		4
Estimated Fair Value	1,717		1,615
Progress Energy [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	7		3
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	149		126
Progress Energy [Member] | Ndtf [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	4		2
Gross Unrealized Holding Losses	1		4
Estimated Fair Value	108		106
Progress Energy [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	9		4
Gross Unrealized Holding Losses	2		5
Estimated Fair Value	394		376
Progress Energy [Member] | Ndtf [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	17		8
Progress Energy [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	3	[1]	1	[1]
Gross Unrealized Holding Losses	0	[1]	0	[1]
Estimated Fair Value	58	[1]	59	[1]
Progress Energy [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	17		20
Progress Energy [Member] | Other Classification [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	3		1
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	41		39
Duke Energy Progress [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	607		544
Gross Unrealized Holding Losses	7		11
Estimated Fair Value	1,634		1,540
Duke Energy Progress [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	607		544
Gross Unrealized Holding Losses	7		11
Estimated Fair Value	1,632		1,538
Duke Energy Progress [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	27		48
Duke Energy Progress [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	590		535
Gross Unrealized Holding Losses	4		3
Estimated Fair Value	1,139		1,069
Duke Energy Progress [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	5		3
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	94		80
Duke Energy Progress [Member] | Ndtf [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	4		2
Gross Unrealized Holding Losses	1		4
Estimated Fair Value	106		104
Duke Energy Progress [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	7		4
Gross Unrealized Holding Losses	2		3
Estimated Fair Value	256		232
Duke Energy Progress [Member] | Ndtf [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	10		5
Duke Energy Progress [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	0	[1]	0	[1]
Gross Unrealized Holding Losses	0	[1]	0	[1]
Estimated Fair Value	2	[1]	2	[1]
Duke Energy Progress [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	2		2
Duke Energy Florida [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	339		305
Gross Unrealized Holding Losses	2		3
Estimated Fair Value	833		803
Duke Energy Florida [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	336		304
Gross Unrealized Holding Losses	2		3
Estimated Fair Value	790		761
Duke Energy Florida [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	10		20
Duke Energy Florida [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	332		304
Gross Unrealized Holding Losses	2		1
Estimated Fair Value	578		546
Duke Energy Florida [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	2		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	55		46
Duke Energy Florida [Member] | Ndtf [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	2		2
Duke Energy Florida [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	2		'
Gross Unrealized Holding Losses	'		2
Estimated Fair Value	138		144
Duke Energy Florida [Member] | Ndtf [Member] | Other Debt Obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	7		3
Duke Energy Florida [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	3	[1]	1	[1]
Gross Unrealized Holding Losses	0	[1]	0	[1]
Estimated Fair Value	43	[1]	42	[1]
Duke Energy Florida [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	2		3
Duke Energy Florida [Member] | Other Classification [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	3		1
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	41		39
Duke Energy Indiana [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	27		24
Gross Unrealized Holding Losses	1		1
Estimated Fair Value	100		94
Duke Energy Indiana [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	27	[1]	24	[1]
Gross Unrealized Holding Losses	1	[1]	1	[1]
Estimated Fair Value	100	[1]	94	[1]
Duke Energy Indiana [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	1		1
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	27		24
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	69		65
Duke Energy Indiana [Member] | Other Classification [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'		'
Gross Unrealized Holding Losses	1		1
Estimated Fair Value	$30		$28
[1]	(a) These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets

Investments_in_Debt_and_Equity4

Investments in Debt and Equity Securities (Maturities) (Details) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'
Due in one year or less	$57
Due after one through five years	459
Due after five through 10 years	440
Due after 10 years	793
Total	1,749
Duke Energy Carolinas [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	24
Due after one through five years	182
Due after five through 10 years	243
Due after 10 years	364
Total	813
Progress Energy [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	24
Due after one through five years	217
Due after five through 10 years	141
Due after 10 years	327
Total	709
Duke Energy Progress [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	15
Due after one through five years	141
Due after five through 10 years	90
Due after 10 years	220
Total	466
Duke Energy Florida [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	9
Due after one through five years	76
Due after five through 10 years	51
Due after 10 years	107
Total	243
Duke Energy Indiana [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	1
Due after one through five years	19
Due after five through 10 years	7
Due after 10 years	3
Total	$30

Investments_in_Debt_and_Equity5

Investments in Debt and Equity Securities Investments in Debt and Equity Securities (Realized Gains and Losses)(Details) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	$31	$32	$62	$63
Realized losses	2	15	6	22
Duke Energy Carolinas [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	29	21	52	46
Realized losses	1	6	2	10
Progress Energy [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	2	10	9	15
Realized losses	1	7	3	9
Duke Energy Progress [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	1	6	7	8
Realized losses	'	3	2	4
Duke Energy Florida [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	1	5	2	8
Realized losses	'	$3	$1	$4

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	$133	$145
Assets, fair value disclosure	5,946	5,712
Derivative liabilities	-507	-321
Net assets, fair value	5,439	5,391
Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	8	33
Assets, fair value disclosure	4,211	4,057
Derivative liabilities	-150	11
Net assets, fair value	4,061	4,068
Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	66	70
Assets, fair value disclosure	1,488	1,515
Derivative liabilities	-320	-303
Net assets, fair value	1,168	1,212
Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	59	42
Assets, fair value disclosure	247	140
Derivative liabilities	-37	-29
Net assets, fair value	210	111
NDTF [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3,873	3,579
NDTF [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3,703	3,495
NDTF [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	57
NDTF [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	168	27
NDTF [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,548	1,553
NDTF [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	374	402
NDTF [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,174	1,100
NDTF [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	51
Other Classification [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	98	102
Other Classification [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	98	91
Other Classification [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	11
Other Classification [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Other Classification [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	294	333
Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	28	36
Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	246	277
Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	20	20
Duke Energy Carolinas [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	3,002	2,837
Derivative liabilities	-3	-2
Net assets, fair value	2,999	2,835
Duke Energy Carolinas [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	2,133	2,047
Derivative liabilities	'	'
Net assets, fair value	2,133	2,047
Duke Energy Carolinas [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	698	709
Derivative liabilities	'	'
Net assets, fair value	698	709
Duke Energy Carolinas [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	171	81
Derivative liabilities	-3	-2
Net assets, fair value	168	79
Duke Energy Carolinas [Member] | NDTF [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2,156	1,964
Duke Energy Carolinas [Member] | NDTF [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,986	1,879
Duke Energy Carolinas [Member] | NDTF [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	58
Duke Energy Carolinas [Member] | NDTF [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	168	27
Duke Energy Carolinas [Member] | NDTF [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	843	870
Duke Energy Carolinas [Member] | NDTF [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	147	168
Duke Energy Carolinas [Member] | NDTF [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	696	651
Duke Energy Carolinas [Member] | NDTF [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	51
Duke Energy Carolinas [Member] | Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Carolinas [Member] | Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Carolinas [Member] | Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3	3
Progress Energy [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	3	3
Assets, fair value disclosure	2,483	2,353
Derivative liabilities	-147	-187
Net assets, fair value	2,336	2,166
Progress Energy [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	1,960	1,867
Derivative liabilities	'	'
Net assets, fair value	1,960	1,867
Progress Energy [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	3	3
Assets, fair value disclosure	523	486
Derivative liabilities	-147	-187
Net assets, fair value	376	299
Progress Energy [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	'	'
Derivative liabilities	'	'
Net assets, fair value	'	'
Progress Energy [Member] | NDTF [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,717	1,615
Progress Energy [Member] | NDTF [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,717	1,615
Progress Energy [Member] | NDTF [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | NDTF [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | NDTF [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	705	677
Progress Energy [Member] | NDTF [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	227	233
Progress Energy [Member] | NDTF [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	478	444
Progress Energy [Member] | NDTF [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | Other Classification [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	58	58
Progress Energy [Member] | Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	16	19
Progress Energy [Member] | Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	42	39
Progress Energy [Member] | Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	1	1
Assets, fair value disclosure	1,635	1,543
Derivative liabilities	-62	-66
Net assets, fair value	1,573	1,477
Duke Energy Progress [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	1,290	1,209
Derivative liabilities	'	'
Net assets, fair value	1,290	1,209
Duke Energy Progress [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	1	1
Assets, fair value disclosure	345	334
Derivative liabilities	-62	-66
Net assets, fair value	283	268
Duke Energy Progress [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	'	'
Derivative liabilities	'	'
Net assets, fair value	'	'
Duke Energy Progress [Member] | NDTF [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,139	1,069
Duke Energy Progress [Member] | NDTF [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,139	1,069
Duke Energy Progress [Member] | NDTF [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | NDTF [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | NDTF [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	493	470
Duke Energy Progress [Member] | NDTF [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	149	137
Duke Energy Progress [Member] | NDTF [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	344	333
Duke Energy Progress [Member] | NDTF [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Other Classification [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	3
Duke Energy Progress [Member] | Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	3
Duke Energy Progress [Member] | Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	2	1
Assets, fair value disclosure	835	801
Derivative liabilities	-85	-116
Net assets, fair value	750	685
Duke Energy Florida [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	657	644
Derivative liabilities	'	'
Net assets, fair value	657	644
Duke Energy Florida [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	2	1
Assets, fair value disclosure	178	157
Derivative liabilities	-85	-116
Net assets, fair value	93	41
Duke Energy Florida [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	'	'
Derivative liabilities	'	'
Net assets, fair value	'	'
Duke Energy Florida [Member] | NDTF [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	578	546
Duke Energy Florida [Member] | NDTF [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	578	546
Duke Energy Florida [Member] | NDTF [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | NDTF [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | NDTF [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	212	214
Duke Energy Florida [Member] | NDTF [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	78	96
Duke Energy Florida [Member] | NDTF [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	134	118
Duke Energy Florida [Member] | NDTF [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | Other Classification [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	43	40
Duke Energy Florida [Member] | Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1	2
Duke Energy Florida [Member] | Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	42	38
Duke Energy Florida [Member] | Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Ohio [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	18	96
Derivative liabilities	-294	-95
Net assets, fair value	-276	1
Duke Energy Ohio [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	50
Derivative liabilities	-145	-1
Net assets, fair value	-145	49
Duke Energy Ohio [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	11	21
Derivative liabilities	-114	-65
Net assets, fair value	-103	-44
Duke Energy Ohio [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	7	25
Derivative liabilities	-35	-29
Net assets, fair value	-28	-4
Duke Energy Indiana [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	45	12
Net assets, fair value	145	106
Duke Energy Indiana [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Net assets, fair value	70	65
Duke Energy Indiana [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Net assets, fair value	30	29
Duke Energy Indiana [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	45	12
Net assets, fair value	45	12
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	70	65
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	70	65
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	'	'
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	'	'
Duke Energy Indiana [Member] | Other Classification [Member] | Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	30	29
Duke Energy Indiana [Member] | Other Classification [Member] | Debt Securities [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	'	'
Duke Energy Indiana [Member] | Other Classification [Member] | Debt Securities [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	30	29
Duke Energy Indiana [Member] | Other Classification [Member] | Debt Securities [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	'	'

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 $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments	'	'	'	'
Beginning balance	$85	$16	$111	$13
Total pretax gains (losses) included in earnings	-6	-11	12	-21
Total pretax gains (losses) included in comprehensive income	'	-1	'	-2
Purchases	66	24	67	24
Sales	-1	'	-2	-3
Issuances	-1	-3	-1	-6
Settlements	-6	-10	-45	-3
Transfers in and/or out of level 3	-70	'	-65	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	3	-5	3	-4
Ending balance	210	10	210	10
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-14	-82	13	-85
Total pretax gains (losses) included in earnings	-6	-11	12	-21
Total pretax gains (losses) included in comprehensive income	'	'	'	'
Purchases	51	21	51	21
Sales	'	'	'	'
Issuances	-1	'	-1	-6
Settlements	-6	-9	-45	-2
Transfers out of level 3	-2	'	3	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-4	-6	-5	-6
Ending balance	22	-87	22	-87
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	-25	'	-25	'
Investments [Member]	'	'	'	'
Investments	'	'	'	'
Beginning balance	99	98	98	98
Total pretax gains (losses) included in earnings	'	'	'	'
Total pretax gains (losses) included in comprehensive income	'	-1	'	-2
Purchases	15	3	16	3
Sales	-1	'	-2	-3
Issuances	'	-3	'	'
Settlements	'	-1	'	-1
Transfers in and/or out of level 3	-68	'	-68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7	1	8	2
Ending balance	188	97	188	97
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	'	'	'	'
Duke Energy Carolinas [Member]	'	'	'	'
Investments	'	'	'	'
Beginning balance	78	68	79	60
Purchases	15	3	16	3
Sales	-1	-3	-2	-3
Settlements	1	1	-1	8
Transfers in and/or out of level 3	68	'	68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7	1	8	2
Ending balance	168	70	168	70
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-4	-5	-2	-12
Purchases	'	'	'	'
Sales	'	'	'	'
Settlements	1	1	-1	8
Transfers out of level 3	'	'	'	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	'	'	'	'
Ending balance	-3	-4	-3	-4
Duke Energy Carolinas [Member] | Investments [Member]	'	'	'	'
Investments	'	'	'	'
Beginning balance	82	73	81	72
Purchases	15	3	16	3
Sales	-1	-3	-2	-3
Settlements	'	'	'	'
Transfers in and/or out of level 3	68	'	68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	7	1	8	2
Ending balance	171	74	171	74
Progress Energy [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-3	-31	'	-38
Total pretax gains (losses) included in earnings	3	'	'	'
Issuances	'	-1	'	-7
Transfers out of level 3	-2	'	-2	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-2	-5	-2	-4
Ending balance	'	-35	'	-35
Duke Energy Progress [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-3	-31	'	-38
Total pretax gains (losses) included in earnings	3	'	'	0
Issuances	'	-1	'	-7
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	'	-5	'	-4
Ending balance	'	-35	'	-35
Duke Energy Ohio [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-19	-5	-4	-6
Total pretax gains (losses) included in earnings	-13	-14	-19	-10
Purchases	1	1	1	1
Settlements	'	'	-4	-3
Transfers out of level 3	-1	'	4	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2	-1	2	-1
Ending balance	-28	-19	-28	-19
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	'	'	-27	'
Duke Energy Indiana [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	7	4	12	10
Total pretax gains (losses) included in earnings	'	7	27	2
Purchases	49	20	49	'
Sales	'	'	'	20
Settlements	-7	-13	-38	-13
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-4	'	-5	-1
Ending balance	$45	$18	$45	$18

Fair_Value_Measurements_Quanti

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosure) (Details) (USD $)

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Apr. 01, 2014

Dec. 31, 2013

Jun. 30, 2013

Apr. 01, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

In Millions, unless otherwise specified

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Capacity Option Contracts [Member]

Commodity Capacity Option Contracts [Member]

Commodity Capacity Option Contracts [Member]

Commodity Capacity Option Contracts [Member]

Commodity Capacity Option Contracts [Member]

Commodity Capacity Option Contracts [Member]

Derivative Financial Instruments Liabilities Reserves [Member]

Derivative Financial Instruments Liabilities Reserves [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Duke Energy Carolinas [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Progress [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Duke Energy Indiana [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

Commodity Power Contracts [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Natural Gas Hedges [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Commodity Power Contracts [Member]

Derivative Financial Instruments Liabilities Reserves [Member]

Derivative Financial Instruments Liabilities Reserves [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Financial Transmission Rights [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

RTO Market Pricing [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Net Derivative Asset (Liability) Fair Value Inputs [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net derivative asset (liability)

$22

($14)

$13

($87)

($82)

($85)

($1)

($2)

'

'

'

'

($2)

'

'

$45

$12

'

'

'

'

($9)

$23

'

'

'

'

$4

$4

'

'

'

'

($17)

($22)

($3)

($4)

($2)

($4)

($5)

($12)

($2)

'

'

'

'

($3)

'

($3)

'

($35)

($31)

($38)

'

($3)

'

($35)

($31)

($38)

($28)

($19)

($4)

($19)

($5)

($6)

($1)

($2)

'

'

'

'

($13)

$18

'

'

'

'

($14)

($20)

$45

$7

$12

$18

$4

$10

$45

$12

'

'

'

'

Fair Value Inputs Price Per MMBtu

'

'

'

'

'

'

'

'

2.92

3.07

4.71

5.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.92

3.07

4.71

5.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value inputs, price per MWh

'

'

'

'

'

'

'

'

'

'

'

'

'

25.79

52.38

'

'

-4.53

-0.3

60.9

13.8

'

'

25.1

20.77

62.77

58.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

36.37

25.79

62.54

52.38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.55

20.77

65.42

58.9

'

'

'

'

'

'

'

'

'

'

-4.53

-0.3

60.9

13.8

Fair Value Inputs Price Per Mwd

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27.65

30.4

161.1

165.1

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

Fair_Value_Measurements_Additi

Fair Value Measurements (Additional Fair Value Disclosure) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	$40,593	$40,256
Long-term debt, fair value	44,558	42,592
Duke Energy Carolinas [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	8,435	8,436
Long-term debt, fair value	9,510	9,123
Progress Energy [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	14,518	14,115
Long-term debt, fair value	16,387	15,234
Duke Energy Progress [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	5,717	5,235
Long-term debt, fair value	6,045	5,323
Duke Energy Florida [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	5,107	4,886
Long-term debt, fair value	5,892	5,408
Duke Energy Ohio [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	1,784	2,188
Long-term debt, fair value	1,983	2,237
Duke Energy Indiana [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	3,795	3,796
Long-term debt, fair value	$4,374	$4,171

Variable_Interest_Entities_Con

Variable Interest Entities (Consolidated VIEs) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	$2,118		$1,719
Other current assets	1,698		1,821
Investments and other assets	3,227		3,432
Accumulated depreciation and amortization	-33,977		-33,625
Other deferred debits	178		181
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	1,782		2,391
Current maturities of long-term debt	1,887		2,104
Other current liabilities	1,786		1,996
Long-term Debt	38,706		38,152
Deferred income taxes	12,014		12,097
Asset retirement obligation	5,030		4,950
Other liabilities	1,723		1,749
Duke Energy Carolinas [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	705		673
Other current assets	271		309
Investments and other assets	997		1,000
Accumulated depreciation and amortization	-12,304		-11,894
Other deferred debits	43		46
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	510		701
Current maturities of long-term debt	47		47
Other current liabilities	368		393
Long-term Debt	8,088		8,089
Deferred income taxes	5,781		5,706
Asset retirement obligation	1,641		1,594
Other liabilities	678		676
Duke Energy Progress [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	471		417
Other current assets	271		296
Investments and other assets	461		443
Accumulated depreciation and amortization	-8,828		-8,623
Other deferred debits	34		32
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	316		420
Current maturities of long-term debt	306		174
Other current liabilities	329		392
Long-term Debt	5,411		5,061
Deferred income taxes	2,715		2,557
Asset retirement obligation	1,779		1,729
Other liabilities	198		222
Duke Energy Florida [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	403		'
Other current assets	23		182
Investments and other assets	256		252
Accumulated depreciation and amortization	-4,380		-4,252
Other deferred debits	43		44
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	345		333
Current maturities of long-term debt	12		11
Other current liabilities	405		445
Long-term Debt	5,095		4,875
Deferred income taxes	1,800		1,829
Asset retirement obligation	818		833
Other liabilities	254		255
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	704		673
Other deferred debits	1		1
Total assets	705		674
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Long-term Debt	400	[1]	400	[1]
Other liabilities	'		1
Total liabilities	400		401
Net assets of consolidated VIEs	305		273
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	471		416
Other deferred debits	'		1
Total assets	471		417
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Long-term Debt	300	[1]	300	[1]
Other liabilities	'		'
Total liabilities	300		300
Net assets of consolidated VIEs	171		117
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	403		'
Other deferred debits	1		'
Total assets	404		'
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Long-term Debt	225	[1]	'
Other liabilities	'		'
Total liabilities	225		'
Net assets of consolidated VIEs	179		'
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	506		595
Other deferred debits	'		'
Total assets	506		595
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Long-term Debt	325	[1]	325	[1]
Total liabilities	325		325
Net assets of consolidated VIEs	181		270
Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	17		18
Other current assets	115		89
Investments and other assets	30		29
Property, plant and equipment, cost	1,856	[2]	1,662	[2]
Accumulated depreciation and amortization	-214		-170
Other deferred debits	33		34
Total assets	1,837		1,662
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	3		2
Taxes accrued	4		10
Current maturities of long-term debt	64		66
Other current liabilities	17		17
Long-term Debt	863	[1]	907	[1]
Deferred income taxes	292		290
Asset retirement obligation	30		26
Other liabilities	33		17
Total liabilities	1,306		1,335
Net assets of consolidated VIEs	531		327
Other VIEs [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	19		17
Other current assets	12		12
Investments and other assets	39		51
Property, plant and equipment, cost	18	[2]	18	[2]
Accumulated depreciation and amortization	-5		-5
Other deferred debits	'		'
Total assets	83		93
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Current maturities of long-term debt	16		14
Other current liabilities	11		10
Long-term Debt	26	[1]	34	[1]
Other liabilities	9		13
Total liabilities	62		71
Net assets of consolidated VIEs	21		22
Total Consolidated VIE [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity Consolidated Carrying Amount Assets [Abstract]	'		'
Restricted receivables of VIEs	2,120		1,719
Other current assets	127		101
Investments and other assets	69		80
Property, plant and equipment, cost	1,874	[2]	1,680	[2]
Accumulated depreciation and amortization	-219		-175
Other deferred debits	35		36
Total assets	4,006		3,441
Variable Interest Entity Consolidated Carrying Amount Liabilities [Abstract]	'		'
Accounts payable	3		2
Taxes accrued	4		10
Current maturities of long-term debt	80		80
Other current liabilities	28		27
Long-term Debt	2,139	[1]	1,966	[1]
Deferred income taxes	292		290
Asset retirement obligation	30		26
Other liabilities	42		31
Total liabilities	2,618		2,432
Net assets of consolidated VIEs	$1,388		$1,009
[1]	Non-recourse to the general assets of the applicable registrant.
[2]	Restricted as collateral for non-recourse debt of VIEs.

Variable_Interest_Entities_Nar

Variable Interest Entities (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	$2,093,000,000
Cinergy Receivables [Member]	'
Variable Interest Entities [Line Items]	'
Line of credit facility, expiration date	1-Nov-16
Minimum equity balance required by Cinergy Receivables	3,000,000
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Ownership interest in OVEC	9.00%
Duke Energy Carolinas [Member] | DERF [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	400,000,000
Line of credit facility, expiration date	1-Oct-16
Duke Energy Progress [Member]	'
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	650,000,000
Duke Energy Progress [Member] | DEPR [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	300,000,000
Line of credit facility, expiration date	1-Dec-16
Duke Energy Florida [Member]	'
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	225,000,000
Duke Energy Florida [Member] | DEFR [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Debt instrument, face amount	$225,000,000
Line of credit facility, expiration date	1-Mar-17
Duke Energy Indiana [Member]	'
Variable Interest Entities [Line Items]	'
Fixed interest rate added to LIBOR to compute variable rate	1.00%
Cinergy Receivables [Member] | Duke Energy Ohio [Member]	'
Variable Interest Entities [Line Items]	'
Fixed interest rate added to LIBOR to compute variable rate	1.00%

Variable_Interest_Entities_Sch

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Variable Interest Entities [Line Items]	'	'
Investments in equity method unconsolidated affiliates	$381	$390
Investments and other assets	3,227	3,432
Other current liabilities	1,786	1,996
Deferred credits and other liabilities	26,878	26,575
Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments in equity method unconsolidated affiliates	178	213
Intangibles, net	'	96
Investments and other assets	4	4
Total assets	182	313
Other current liabilities	3	3
Deferred credits and other liabilities	14	15
Total liabilities	17	18
Net assets (liabilities)	165	295
Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments in equity method unconsolidated affiliates	152	153
Total assets	152	153
Net assets (liabilities)	152	153
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments in equity method unconsolidated affiliates	26	60
Intangibles, net	'	96
Investments and other assets	4	4
Total assets	30	160
Other current liabilities	3	3
Deferred credits and other liabilities	14	15
Total liabilities	17	18
Net assets (liabilities)	13	142
Duke Energy Ohio [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments and other assets	19	232
Other current liabilities	78	110
Deferred credits and other liabilities	2,080	2,546
Duke Energy Ohio [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables (net of allowance for doubtful accounts)	68	114
Intangibles, net	'	96
Total assets	68	210
Net assets (liabilities)	68	210
Duke Energy Indiana [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments and other assets	218	269
Other current liabilities	125	88
Deferred credits and other liabilities	2,422	2,334
Duke Energy Indiana [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables (net of allowance for doubtful accounts)	98	143
Total assets	98	143
Net assets (liabilities)	$98	$143

Variable_Interest_Entities_Fai

Variable Interest Entities (Fair Value Assumptions)(Details) (Cinergy Receivables [Member])	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Duke Energy Ohio [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Anticipated credit loss ratio	0.60%	0.60%
Discount rate	1.20%	1.20%
Receivable turnover rate	12.80%	12.80%
Duke Energy Indiana [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Anticipated credit loss ratio	0.30%	0.30%
Discount rate	1.20%	1.20%
Receivable turnover rate	10.50%	10.30%

Variable_Interest_Entities_Rec

Variable Interest Entities (Receivables Sold)(Details) (Cinergy Receivables [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Duke Energy Ohio [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables sold	$236	$290
Less: Retained interests	68	114
Net receivables sold	168	176
Duke Energy Indiana [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables sold	311	340
Less: Retained interests	98	143
Net receivables sold	$213	$197

Variable_Interest_Entities_Sal

Variable Interest Entities (Sales and Cash Flows)(Details) (Cinergy Receivables [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Duke Energy Ohio [Member]	'	'	'	'
Variable Interest Entities [Line Items]	'	'	'	'
Receivables sold	$487	$512	$1,228	$1,150
Loss recognized on sale	-2	3	-6	6
Cash proceeds from receivables sold	544	539	1,267	1,156
Collection fees received	1	1	1	1
Return received on retained interests	1	2	3	3
Duke Energy Indiana [Member]	'	'	'	'
Variable Interest Entities [Line Items]	'	'	'	'
Receivables sold	679	702	1,434	1,449
Loss recognized on sale	-2	3	-5	6
Cash proceeds from receivables sold	713	721	1,474	1,446
Collection fees received	1	1	1	1
Return received on retained interests	$1	$1	$3	$3

Common_Stock_Details

Common Stock (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Common Stock [Line Items]	'	'	'	'
Average shares, basic	707	706	707	705
Average shares, diluted	707	706	707	706
EPS, basic (usd per share)	$0.86	$0.48	$0.73	$1.37
EPS, diluted (usd per share)	$0.86	$0.48	$0.73	$1.37
Number of stock options and performance and unvested stock awards excluded from the dilutive securities calculation	'	'	2	2
Dividends declared per share (usd per share)	$0.78	$1.54	$1.56	$2.31
Income [Member]	'	'	'	'
Common Stock [Line Items]	'	'	'	'
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities b basic and diluted	$611	$340	$516	$969
Average Shares [Member]	'	'	'	'
Common Stock [Line Items]	'	'	'	'
Stock options, performance and restricted shares	'	'	'	1
Average shares, basic and diluted	707	706	707	'
Average shares, basic	'	'	'	705
Average shares, diluted	'	'	'	706
EPS [Member]	'	'	'	'
Common Stock [Line Items]	'	'	'	'
EPS, basic and diluted (usd per share)	$0.86	$0.48	$0.73	'
EPS, basic (usd per share)	'	'	'	$1.37
EPS, diluted (usd per share)	'	'	'	$1.37

StockBased_Compensation_Schedu

Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	$16	$19	$32	$46
Tax benefit associated with stock-based compensation expense	6	8	12	18
Stock-based compensation costs capitalized	1	1	2	2
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	'	'	'	2
Restricted Stock Units Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	11	12	22	26
Performance Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	$5	$7	$10	$18

Employee_Benefit_Plans_Narrati

Employee Benefit Plans (Narrative) (Details)	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Matching contribution percentage	100.00%
Eligible pay percentage	6.00%
Additional savings plan account contribution percentage for employees not participating in defined pension plans	4.00%

Employee_Benefit_Plans_Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Qualified Pension Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	$34	$42	$68	$84
Interest cost on projected benefit obligation	86	80	172	160
Expected return on plan assets	-127	-137	-255	-274
Amortization of actuarial loss (gain)	37	61	74	122
Amortization of prior service cost (credit)	-3	-3	-7	-6
Other	1	1	3	3
Net periodic costs	28	44	55	89
Qualified Pension Plans [Member] | Duke Energy Carolinas [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	11	13	21	25
Interest cost on projected benefit obligation	21	20	42	40
Expected return on plan assets	-33	-37	-66	-74
Amortization of actuarial loss (gain)	9	15	18	30
Amortization of prior service cost (credit)	-2	-1	-4	-3
Other	'	'	1	1
Net periodic costs	6	10	12	19
Qualified Pension Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	10	15	20	30
Interest cost on projected benefit obligation	28	29	56	58
Expected return on plan assets	-43	-49	-86	-99
Amortization of actuarial loss (gain)	17	25	34	50
Amortization of prior service cost (credit)	-1	-1	-2	-2
Other	'	'	1	1
Net periodic costs	11	19	23	38
Qualified Pension Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	5	6	10	11
Interest cost on projected benefit obligation	14	12	27	25
Expected return on plan assets	-22	-24	-43	-47
Amortization of actuarial loss (gain)	8	12	16	23
Amortization of prior service cost (credit)	-1	'	-1	'
Other	1	'	1	'
Net periodic costs	5	6	10	12
Qualified Pension Plans [Member] | Duke Energy Florida [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	5	7	10	15
Interest cost on projected benefit obligation	15	14	29	27
Expected return on plan assets	-22	-22	-43	-44
Amortization of actuarial loss (gain)	8	13	16	25
Amortization of prior service cost (credit)	-1	-1	-1	-1
Other	1	'	1	'
Net periodic costs	6	11	12	22
Qualified Pension Plans [Member] | Duke Energy Ohio [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	1	2	3
Interest cost on projected benefit obligation	5	6	10	11
Expected return on plan assets	-6	-7	-13	-15
Amortization of actuarial loss (gain)	1	3	2	6
Amortization of prior service cost (credit)	'	'	'	'
Other	'	'	'	'
Net periodic costs	1	3	1	5
Qualified Pension Plans [Member] | Duke Energy Indiana [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	2	3	4	6
Interest cost on projected benefit obligation	8	7	15	14
Expected return on plan assets	-11	-11	-20	-22
Amortization of actuarial loss (gain)	3	5	6	11
Amortization of prior service cost (credit)	'	'	'	'
Other	'	'	'	'
Net periodic costs	2	4	5	9
Non-Qualified Pension Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	1	1	1
Interest cost on projected benefit obligation	3	3	7	7
Amortization of actuarial loss (gain)	1	1	1	3
Amortization of prior service cost (credit)	'	'	'	-1
Net periodic costs	5	5	9	10
Non-Qualified Pension Plans [Member] | Duke Energy Carolinas [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	'	'	'
Interest cost on projected benefit obligation	'	1	'	1
Amortization of actuarial loss (gain)	'	'	'	'
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	0	1	0	1
Non-Qualified Pension Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	'	1	'
Interest cost on projected benefit obligation	'	2	2	4
Amortization of actuarial loss (gain)	1	1	1	2
Amortization of prior service cost (credit)	'	'	'	-1
Net periodic costs	2	3	4	5
Non-Qualified Pension Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	'	'	'
Interest cost on projected benefit obligation	'	1	1	1
Amortization of actuarial loss (gain)	'	'	'	'
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	0	1	1	1
Non-Qualified Pension Plans [Member] | Duke Energy Florida [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	'	'	'
Interest cost on projected benefit obligation	1	1	1	1
Amortization of actuarial loss (gain)	'	'	'	'
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	1	1	1	1
Other Post-Retirement Benefit Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	3	7	5	14
Interest cost on projected benefit obligation	13	18	25	36
Expected return on plan assets	-3	-4	-6	-7
Amortization of actuarial loss (gain)	10	13	20	26
Amortization of prior service cost (credit)	-32	-3	-63	-6
Net periodic costs	-9	31	-19	63
Other Post-Retirement Benefit Plans [Member] | Duke Energy Carolinas [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	'	1	1
Interest cost on projected benefit obligation	3	3	6	6
Expected return on plan assets	-2	-2	-4	-5
Amortization of actuarial loss (gain)	'	1	1	2
Amortization of prior service cost (credit)	-2	-2	-5	-4
Net periodic costs	0	0	-1	0
Other Post-Retirement Benefit Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	5	2	11
Interest cost on projected benefit obligation	5	12	11	23
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	11	15	21	29
Amortization of prior service cost (credit)	-23	-1	-47	-1
Net periodic costs	-6	31	-13	62
Other Post-Retirement Benefit Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	3	1	6
Interest cost on projected benefit obligation	2	6	5	12
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	8	9	15	18
Amortization of prior service cost (credit)	-18	-1	-36	-1
Net periodic costs	-7	17	-15	35
Other Post-Retirement Benefit Plans [Member] | Duke Energy Florida [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	2	2	4
Interest cost on projected benefit obligation	3	4	6	8
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	3	4	5	8
Amortization of prior service cost (credit)	-6	'	-11	'
Net periodic costs	1	10	2	20
Other Post-Retirement Benefit Plans [Member] | Duke Energy Ohio [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	'	'	'
Interest cost on projected benefit obligation	1	1	1	1
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	-1	-1	-1	-1
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	0	0	0	0
Other Post-Retirement Benefit Plans [Member] | Duke Energy Indiana [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	'	'	'
Interest cost on projected benefit obligation	2	2	3	3
Expected return on plan assets	-1	'	-1	'
Amortization of actuarial loss (gain)	'	'	'	'
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	$1	$2	$2	$3

Employee_Benefit_Plans_Employe

Employee Benefit Plans (Employee Savings Plans) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	$36	$30	$80	$71
Duke Energy Carolinas [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	12	10	26	24
Progress Energy [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	11	10	23	22
Duke Energy Progress [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	7	6	16	12
Duke Energy Florida [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	3	3	7	7
Duke Energy Ohio [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	1	1	2	2
Duke Energy Indiana [Member]	'	'	'	'
Employee Savings Plans [Abstract]	'	'	'	'
Pretax employer matching contributions	$2	$1	$4	$3

Income_Taxes_Effective_Tax_Rat

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
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	25.40%	32.50%	13.60%	33.60%
Duke Energy Carolinas [Member]	'	'	'	'
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	28.90%	37.40%	33.60%	37.20%
Progress Energy [Member]	'	'	'	'
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	37.70%	59.90%	37.40%	36.70%
Duke Energy Progress [Member]	'	'	'	'
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	37.30%	39.60%	36.90%	38.70%
Duke Energy Florida [Member]	'	'	'	'
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	38.70%	38.00%	38.60%	39.80%
Duke Energy Ohio [Member]	'	'	'	'
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	36.20%	36.30%	35.50%	35.90%
Duke Energy Indiana [Member]	'	'	'	'
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	36.90%	37.50%	36.80%	37.50%