Progress Energy (PREX) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 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-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	707,290,608
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				9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Operating Revenues	'		'		'		'
Regulated electric	$5,861		$5,685		$16,549		$15,355
Nonregulated electric, natural gas and other	449		449		1,403		1,415
Regulated natural gas	85		83		414		362
Total operating revenues	6,395		6,217		18,366		17,132
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	2,132		2,013		5,940		5,394
Fuel used in electric generation and purchased power - nonregulated	148		130		410		435
Cost of natural gas and other	27		18		181		132
Operation, maintenance and other	1,409		1,402		4,254		4,211
Depreciation and amortization	788		672		2,305		1,940
Property and other taxes	275		319		936		972
Impairment charges	1		2		81		388
Total operating expenses	4,780		4,556		14,107		13,472
Gains (Losses) on Sales of Other Assets and Other, net	4		-1		11		3
Operating Income (Loss)	1,619		1,660		4,270		3,663
Other Income and Expenses	'		'		'		'
Equity in earnings of unconsolidated affiliates	28		32		97		91
Other income and expenses, net	109		55		293		182
Total other income and expenses	137		87		390		273
Interest Expense	405		378		1,212		1,125
Income (Loss) From Continuing Operations Before Income Taxes	1,351		1,369		3,448		2,811
Income Tax Expense (Benefit) from Continuing Operations	460		423		1,081		909
Income (Loss) from Continuing Operations Attributable to Parent	888		942		2,356		1,890
Income (Loss) From Continuing Operations	891		946		2,367		1,902
Income (Loss) From Discontinued Operations, net of tax	378		62		-578		82
Net income (loss)	1,269		1,008		1,789		1,984
Less: Net Income (Loss) Attributable to Noncontrolling Interests	-5		4		3		7
Net Income (Loss) Attributable to Parent	1,274		1,004		1,786		1,977
Other Comprehensive Loss, net of tax	'		'		'		'
Pension and OPEB adjustments	1		'		1		5
Net unrealized gain (loss) on cash flow hedges	2	[1]	1	[1]	-10	[1]	55	[1]
Reclassification into earnings from cash flow hedges	2		1		5		1
Unrealized gains (losses) on investments in available-for-sale securities	'		-1		2		-5
Other Comprehensive Loss, net of tax	-97		-4		-52		-78
Comprehensive Income (Loss)	1,172		1,004		1,737		1,906
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	-1		4		8		3
Comprehensive Income Attributable to Parent	1,173		1,000		1,729		1,903
Income from continuing operations attributable to Duke Energy Corporation common shareholders	'		'		'		'
Basic (usd per share)	$1.25		$1.33		$3.33		$2.67
Diluted (usd per share)	$1.25		$1.33		$3.33		$2.67
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common shareholders	'		'		'		'
Basic (usd per share)	$0.55		$0.09		($0.81)		$0.12
Diluted (usd per share)	$0.55		$0.09		($0.81)		$0.12
Net Income attributable to Duke Energy Corporation common shareholders	'		'		'		'
Basic (usd per share)	$1.80		$1.42		$2.52		$2.79
Diluted (usd per share)	$1.80		$1.42		$2.52		$2.79
Weighted-average shares outstanding	'		'		'		'
Basic (shares)	707		706		707		706
Diluted (shares)	707		706		707		706
Duke Energy Carolinas [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Total operating revenues	1,938		1,919		5,693		5,239
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	524		539		1,685		1,500
Operation, maintenance and other	465		456		1,415		1,392
Depreciation and amortization	260		228		750		676
Property and other taxes	59		90		263		282
Impairment charges	'		'		3		'
Total operating expenses	1,308		1,313		4,116		3,850
Gains (Losses) on Sales of Other Assets and Other, net	'		-2		'		'
Operating Income (Loss)	630		604		1,577		1,389
Other Income and Expenses	'		'		'		'
Other income and expenses, net	44		29		137		94
Interest Expense	104		82		307		255
Income (Loss) From Continuing Operations Before Income Taxes	570		551		1,407		1,228
Income Tax Expense (Benefit) from Continuing Operations	193		209		474		461
Net Income (Loss) Attributable to Parent	377		342		933		767
Other Comprehensive Loss, net of tax	'		'		'		'
Reclassification into earnings from cash flow hedges	'		1		2		1
Other Comprehensive Loss, net of tax	'		'		2		1
Comprehensive Income Attributable to Parent	377		343		935		768
Progress Energy [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Total operating revenues	2,863		2,766		7,825		7,233
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	1,214		1,154		3,234		2,932
Operation, maintenance and other	564		559		1,714		1,653
Depreciation and amortization	294		240		851		644
Property and other taxes	127		141		415		423
Impairment charges	1		2		-16		368
Total operating expenses	2,200		2,096		6,198		6,020
Gains (Losses) on Sales of Other Assets and Other, net	2		1		3		2
Operating Income (Loss)	665		671		1,630		1,215
Other Income and Expenses	'		'		'		'
Other income and expenses, net	26		26		54		63
Interest Expense	166		162		502		520
Income (Loss) From Continuing Operations Before Income Taxes	525		535		1,182		758
Income Tax Expense (Benefit) from Continuing Operations	195		207		441		289
Income (Loss) from Continuing Operations Attributable to Parent	329		327		739		467
Income (Loss) From Continuing Operations	330		328		741		469
Income (Loss) From Discontinued Operations, net of tax	'		14		-6		10
Net income (loss)	330		342		735		479
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1		1		2		2
Net Income (Loss) Attributable to Parent	329		341		733		477
Other Comprehensive Loss, net of tax	'		'		'		'
Pension and OPEB adjustments	1		4		2		5
Net unrealized gain (loss) on cash flow hedges	'		-3		'		'
Reclassification into earnings from cash flow hedges	1		3		5		3
Unrealized gains (losses) on investments in available-for-sale securities	1		'		1		'
Other Comprehensive Loss, net of tax	3		4		8		8
Comprehensive Income (Loss)	333		346		743		487
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1		1		2		2
Comprehensive Income Attributable to Parent	332		345		741		485
Duke Energy Progress [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Total operating revenues	1,367		1,430		3,980		3,781
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	552		574		1,579		1,470
Operation, maintenance and other	346		352		1,074		1,044
Depreciation and amortization	155		143		441		393
Property and other taxes	29		59		150		172
Impairment charges	'		'		-18		22
Total operating expenses	1,082		1,128		3,226		3,101
Gains (Losses) on Sales of Other Assets and Other, net	'		1		1		1
Operating Income (Loss)	285		303		755		681
Other Income and Expenses	'		'		'		'
Other income and expenses, net	18		21		34		43
Interest Expense	57		52		172		147
Income (Loss) From Continuing Operations Before Income Taxes	246		272		617		577
Income Tax Expense (Benefit) from Continuing Operations	89		97		226		215
Net Income (Loss) Attributable to Parent	157		175		391		362
Duke Energy Florida [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Total operating revenues	1,491		1,332		3,832		3,442
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	662		579		1,655		1,462
Operation, maintenance and other	212		207		626		616
Depreciation and amortization	139		95		410		237
Property and other taxes	99		81		266		245
Impairment charges	1		1		2		346
Total operating expenses	1,113		963		2,959		2,906
Gains (Losses) on Sales of Other Assets and Other, net	'		'		'		1
Operating Income (Loss)	378		369		873		537
Other Income and Expenses	'		'		'		'
Other income and expenses, net	6		6		17		19
Interest Expense	51		46		150		138
Income (Loss) From Continuing Operations Before Income Taxes	333		329		740		418
Income Tax Expense (Benefit) from Continuing Operations	128		132		285		168
Net Income (Loss) Attributable to Parent	205		197		455		250
Other Comprehensive Loss, net of tax	'		'		'		'
Pension and OPEB adjustments	'		-1		'		-1
Reclassification into earnings from cash flow hedges	'		'		1		'
Other Comprehensive Loss, net of tax	0		-1		1		-1
Comprehensive Income Attributable to Parent	205		196		456		249
Duke Energy Ohio [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Regulated electric	352		338		998		957
Nonregulated electric, natural gas and other	6		16		17		28
Regulated natural gas	88		84		418		364
Total operating revenues	446		438		1,433		1,349
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	129		121		360		327
Fuel used in electric generation and purchased power - nonregulated	5		13		24		32
Cost of natural gas and other	8		9		129		102
Operation, maintenance and other	134		133		378		415
Depreciation and amortization	54		53		167		160
Property and other taxes	58		59		170		184
Impairment charges	'		'		94		'
Total operating expenses	388		388		1,322		1,220
Gains (Losses) on Sales of Other Assets and Other, net	'		'		'		4
Operating Income (Loss)	58		50		111		133
Other Income and Expenses	'		'		'		'
Other income and expenses, net	3		2		9		4
Interest Expense	20		14		60		47
Income (Loss) From Continuing Operations Before Income Taxes	41		38		60		90
Income Tax Expense (Benefit) from Continuing Operations	15		14		21		33
Income (Loss) from Continuing Operations Attributable to Parent	26		24		39		57
Income (Loss) From Discontinued Operations, net of tax	413		35		-597		39
Net Income (Loss) Attributable to Parent	439		59		-558		96
Other Comprehensive Loss, net of tax	'		'		'		'
Pension and OPEB adjustments	'		'		'		1
Other Comprehensive Loss, net of tax	'		'		'		1
Comprehensive Income Attributable to Parent	439		59		-558		97
Duke Energy Indiana [Member]	'		'		'		'
Operating Revenues	'		'		'		'
Total operating revenues	790		755		2,383		2,179
Operating Expenses	'		'		'		'
Fuel used in electric generation and purchased power - regulated	319		283		945		852
Operation, maintenance and other	160		176		485		489
Depreciation and amortization	104		72		309		227
Property and other taxes	25		21		69		59
Total operating expenses	608		552		1,808		1,627
Operating Income (Loss)	182		203		575		552
Other Income and Expenses	'		'		'		'
Other income and expenses, net	5		4		16		14
Interest Expense	40		43		127		127
Income (Loss) From Continuing Operations Before Income Taxes	147		164		464		439
Income Tax Expense (Benefit) from Continuing Operations	46		60		163		163
Net Income (Loss) Attributable to Parent	101		104		301		276
Other Comprehensive Loss, net of tax	'		'		'		'
Reclassification into earnings from cash flow hedges	'		-1		'		-2
Other Comprehensive Loss, net of tax	'		'		'		-2
Comprehensive Income Attributable to Parent	$101		$103		$301		$274
[1]	Net of insignificant tax expense and $5 million tax benefit for the three and nine months ended September 30, 2014 and $1 million tax benefit and $17 million tax expense for the three and nine months ended September 30, 2013.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'		'		'		'
Net income (loss)	$1,269		$1,008		$1,789		$1,984
Other Comprehensive Loss, net of tax	'		'		'		'
Foreign currency translation adjustments	-102		-8		-50		-137
Pension and OPEB adjustments	1		'		1		5
Net unrealized gain (loss) on cash flow hedges	2	[1]	1	[1]	-10	[1]	55	[1]
Reclassification into earnings from cash flow hedges	2		1		5		1
Unrealized gains (losses) on investments in available-for-sale securities	'		-1		2		-5
Reclassification into earnings from available-for-sale-securities	'		3		'		3
Other Comprehensive Loss, net of tax	-97		-4		-52		-78
Comprehensive Income (Loss)	1,172		1,004		1,737		1,906
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests	-1		4		8		3
Comprehensive Income Attributable to Parent	$1,173		$1,000		$1,729		$1,903
[1]	Net of insignificant tax expense and $5 million tax benefit for the three and nine months ended September 30, 2014 and $1 million tax benefit and $17 million tax expense for the three and nine months ended September 30, 2013.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'
Net unrealized gains (losses) on cash flow hedges, tax	($1)	($5)	$17

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$1,931	$1,501
Short-Term investments	'	44
Receivables (net of allowance for doubtful accounts)	854	1,286
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	2,069	1,719
Inventory	3,200	3,250
Assets held for sale	335	'
Regulatory assets	1,232	895
Other	1,954	1,821
Total current assets	11,575	10,516
Investments and Other Assets	'	'
Investments in equity method unconsolidated affiliates	350	390
Nuclear decommissioning trust funds	5,374	5,132
Goodwill	16,331	16,340
Assets held for sale	2,718	107
Other	3,287	3,432
Total investments and other assets	28,060	25,401
Property, Plant and Equipment	'	'
Cost	104,140	103,115
Accumulated depreciation and amortization	-34,545	-33,625
Net property, plant and equipment	69,595	69,490
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	10,252	9,191
Other	174	181
Total regulatory assets and deferred debits	10,426	9,372
Total Assets	119,656	114,779
Current Liabilities	'	'
Accounts payable	1,801	2,391
Notes payable and commercial paper	1,787	839
Taxes accrued	704	551
Interest accrued	476	440
Current maturities of long-term debt	1,156	2,104
Liabilities associated with assets held for sale	284	7
Regulatory liabilities	175	316
Other	1,868	1,996
Total current liabilities	8,251	8,644
Long-Term Debt	38,702	38,152
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	12,989	12,097
Investment tax credits	431	442
Accrued pension and other post-retirement benefit costs	1,231	1,322
Liabilities associated with assets held for sale	57	66
Asset retirement obligations	8,499	4,950
Regulatory liabilities	6,220	5,949
Other	1,823	1,749
Total deferred credits and other liabilities	31,250	26,575
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1	1
Additional paid-in capital	39,388	39,365
Retained earnings	2,479	2,363
Accumulated other comprehensive loss	-456	-399
Total Duke Energy Corporation stockholders' equity	41,412	41,330
Noncontrolling interests	41	78
Total equity	41,453	41,408
Total Liabilities and Equity	119,656	114,779
Duke Energy Carolinas [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	34	23
Receivables (net of allowance for doubtful accounts)	123	186
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	695	673
Receivables from affiliated companies	117	75
Notes receivable from affiliated companies	339	222
Inventory	973	1,065
Regulatory assets	388	295
Other	247	309
Total current assets	2,916	2,848
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	2,965	2,840
Other	975	1,000
Total investments and other assets	3,940	3,840
Property, Plant and Equipment	'	'
Cost	37,670	34,906
Accumulated depreciation and amortization	-12,544	-11,894
Net property, plant and equipment	25,126	23,012
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	1,986	1,527
Other	42	46
Total regulatory assets and deferred debits	2,028	1,573
Total Assets	34,010	31,273
Current Liabilities	'	'
Accounts payable	514	701
Accounts payable to affiliated companies	176	161
Taxes accrued	334	147
Interest accrued	130	97
Current maturities of long-term debt	7	47
Regulatory liabilities	31	65
Other	399	393
Total current liabilities	1,591	1,611
Long-Term Debt	8,087	8,089
Long-Term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	5,725	5,706
Investment tax credits	205	210
Accrued pension and other post-retirement benefit costs	149	161
Asset retirement obligations	3,691	1,594
Regulatory liabilities	2,690	2,576
Other	663	676
Total deferred credits and other liabilities	13,123	10,923
Commitments and Contingencies	'	'
Equity	'	'
Member's equity	10,922	10,365
Accumulated other comprehensive loss	-13	-15
Total member's equity	10,909	10,350
Total Liabilities and Equity	34,010	31,273
Progress Energy [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	47	58
Receivables (net of allowance for doubtful accounts)	184	528
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	877	417
Receivables from affiliated companies	36	4
Notes receivable from affiliated companies	164	75
Inventory	1,509	1,424
Regulatory assets	566	353
Other	622	726
Total current assets	4,005	3,585
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	2,409	2,292
Goodwill	3,655	3,655
Other	792	804
Total investments and other assets	6,856	6,751
Property, Plant and Equipment	'	'
Cost	37,796	36,480
Accumulated depreciation and amortization	-13,397	-13,098
Net property, plant and equipment	24,399	23,382
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	4,818	4,155
Other	94	96
Total regulatory assets and deferred debits	4,912	4,251
Total Assets	40,172	37,969
Current Liabilities	'	'
Accounts payable	636	836
Accounts payable to affiliated companies	265	123
Notes payable to affiliated companies	822	1,213
Taxes accrued	317	105
Interest accrued	192	181
Current maturities of long-term debt	318	485
Regulatory liabilities	106	207
Other	743	896
Total current liabilities	3,399	4,046
Long-Term Debt	14,194	13,630
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	3,999	3,283
Accrued pension and other post-retirement benefit costs	621	765
Asset retirement obligations	4,015	2,562
Regulatory liabilities	2,397	2,292
Other	515	527
Total deferred credits and other liabilities	11,547	9,429
Commitments and Contingencies	'	'
Equity	'	'
Common stock	0	0
Additional paid-in capital	7,467	7,467
Retained earnings	3,647	3,452
Accumulated other comprehensive loss	-51	-59
Total Duke Energy Corporation stockholders' equity	11,063	10,860
Noncontrolling interests	-31	4
Total equity	11,032	10,864
Total Liabilities and Equity	40,172	37,969
Duke Energy Progress [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	6	21
Receivables (net of allowance for doubtful accounts)	72	145
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	475	417
Receivables from affiliated companies	9	2
Inventory	928	853
Regulatory assets	325	127
Other	261	296
Total current assets	2,076	1,861
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	1,626	1,539
Other	475	443
Total investments and other assets	2,101	1,982
Property, Plant and Equipment	'	'
Cost	23,511	22,273
Accumulated depreciation and amortization	-8,931	-8,623
Net property, plant and equipment	14,580	13,650
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	2,187	1,384
Other	34	32
Total regulatory assets and deferred debits	2,221	1,416
Total Assets	20,978	18,909
Current Liabilities	'	'
Accounts payable	305	420
Accounts payable to affiliated companies	205	103
Notes payable to affiliated companies	122	462
Taxes accrued	149	37
Interest accrued	78	70
Current maturities of long-term debt	306	174
Regulatory liabilities	66	63
Other	344	392
Total current liabilities	1,575	1,721
Long-Term Debt	5,410	5,061
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	2,729	2,557
Accrued pension and other post-retirement benefit costs	311	321
Asset retirement obligations	3,206	1,729
Regulatory liabilities	1,796	1,673
Other	159	222
Total deferred credits and other liabilities	8,201	6,502
Commitments and Contingencies	'	'
Equity	'	'
Common stock	2,159	2,159
Retained earnings	3,633	3,466
Total equity	5,792	5,625
Total Liabilities and Equity	20,978	18,909
Duke Energy Florida [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	15	16
Receivables (net of allowance for doubtful accounts)	109	375
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	403	'
Receivables from affiliated companies	40	3
Notes receivable from affiliated companies	182	'
Inventory	581	571
Regulatory assets	241	221
Other	230	182
Total current assets	1,801	1,368
Investments and Other Assets	'	'
Nuclear decommissioning trust funds	783	753
Other	261	252
Total investments and other assets	1,044	1,005
Property, Plant and Equipment	'	'
Cost	14,275	13,863
Accumulated depreciation and amortization	-4,460	-4,252
Net property, plant and equipment	9,815	9,611
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	2,631	2,729
Other	42	44
Total regulatory assets and deferred debits	2,673	2,773
Total Assets	15,333	14,757
Current Liabilities	'	'
Accounts payable	331	333
Accounts payable to affiliated companies	67	38
Notes payable to affiliated companies	'	181
Taxes accrued	164	66
Interest accrued	65	46
Current maturities of long-term debt	12	11
Regulatory liabilities	40	144
Other	370	445
Total current liabilities	1,049	1,264
Long-Term Debt	5,090	4,875
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	2,109	1,829
Accrued pension and other post-retirement benefit costs	277	286
Asset retirement obligations	809	833
Regulatory liabilities	600	618
Other	270	255
Total deferred credits and other liabilities	4,065	3,821
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1,762	1,762
Retained earnings	3,367	3,036
Accumulated other comprehensive loss	'	-1
Total equity	5,129	4,797
Total Liabilities and Equity	15,333	14,757
Duke Energy Ohio [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	28	36
Receivables (net of allowance for doubtful accounts)	110	121
Receivables from affiliated companies	59	121
Notes receivable from affiliated companies	235	57
Inventory	139	229
Assets held for sale	284	'
Regulatory assets	67	57
Other	135	270
Total current assets	1,057	891
Investments and Other Assets	'	'
Goodwill	920	920
Assets held for sale	2,682	'
Other	20	232
Total investments and other assets	3,622	1,152
Property, Plant and Equipment	'	'
Cost	7,155	11,143
Accumulated depreciation and amortization	-2,250	-2,908
Net property, plant and equipment	4,905	8,235
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	480	471
Other	8	14
Total regulatory assets and deferred debits	488	485
Total Assets	10,072	10,763
Current Liabilities	'	'
Accounts payable	168	319
Accounts payable to affiliated companies	71	77
Notes payable to affiliated companies	563	43
Taxes accrued	188	167
Interest accrued	30	17
Current maturities of long-term debt	197	47
Liabilities associated with assets held for sale	269	'
Regulatory liabilities	10	27
Other	79	110
Total current liabilities	1,575	807
Long-Term Debt	1,586	2,141
Deferred Credits and Other Liabilities	'	'
Deferred income taxes	1,753	2,012
Accrued pension and other post-retirement benefit costs	29	58
Liabilities associated with assets held for sale	57	'
Asset retirement obligations	25	28
Regulatory liabilities	267	262
Other	169	186
Total deferred credits and other liabilities	2,300	2,546
Commitments and Contingencies	'	'
Equity	'	'
Common stock	762	762
Additional paid-in capital	4,782	4,882
Retained earnings	-933	-375
Total equity	4,611	5,269
Total Liabilities and Equity	10,072	10,763
Duke Energy Indiana [Member]	'	'
Current Assets	'	'
Cash and cash equivalents	24	15
Receivables (net of allowance for doubtful accounts)	54	22
Receivables from affiliated companies	79	151
Notes receivable from affiliated companies	'	96
Inventory	464	434
Regulatory assets	134	118
Other	235	125
Total current assets	990	961
Investments and Other Assets	'	'
Other	214	269
Total investments and other assets	214	269
Property, Plant and Equipment	'	'
Cost	12,918	12,489
Accumulated depreciation and amortization	-4,138	-3,913
Net property, plant and equipment	8,780	8,576
Regulatory Assets and Deferred Debits	'	'
Regulatory assets	670	717
Other	24	25
Total regulatory assets and deferred debits	694	742
Total Assets	10,678	10,548
Current Liabilities	'	'
Accounts payable	152	206
Accounts payable to affiliated companies	60	56
Notes payable to affiliated companies	61	'
Taxes accrued	51	57
Interest accrued	53	56
Current maturities of long-term debt	5	5
Regulatory liabilities	28	16
Other	116	88
Total current liabilities	526	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	1,441	1,171
Investment tax credits	139	140
Accrued pension and other post-retirement benefit costs	104	163
Asset retirement obligations	30	30
Regulatory liabilities	811	782
Other	48	48
Total deferred credits and other liabilities	2,573	2,334
Commitments and Contingencies	'	'
Equity	'	'
Common stock	1	1
Additional paid-in capital	1,384	1,384
Retained earnings	2,401	2,551
Accumulated other comprehensive loss	3	3
Total equity	3,789	3,939
Total Liabilities and Equity	$10,678	$10,548

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Receivables, allowance for doubtful accounts	$16	$30
Restricted receivables, allowance for doubtful accounts	52	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	8	'
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	1	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 $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income (loss)	$1,789	$1,984
Net Income (Loss) Attributable to Parent	1,786	1,977
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,641	2,365
Equity component of AFUDC	-99	-121
Community support and charitable contributions expense	'	34
Gains (losses) on sales of other assets	-27	8
Impairment charges	848	388
Deferred income taxes	562	1,014
Equity in earnings of unconsolidated affiliates	-97	-91
Accrued pension and other post-retirement benefit costs	81	259
Contributions to qualified pension plans	'	-27
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	128	-14
Receivables	-24	-154
Inventory	-17	119
Other current assets	-315	-48
Increase (decrease) in	'	'
Accounts payable	-303	-412
Taxes accrued	37	245
Other current liabilities	-99	-31
Other assets	-100	-307
Other liabilities	162	-221
Net cash provided by operating activities	5,167	4,990
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-3,755	-3,854
Investment expenditures	-65	-53
Acquisitions	-16	'
Purchases of available-for-sale securities	-2,424	-4,591
Proceeds from sales and maturities of available-for-sale securities	2,445	4,687
Net proceeds from the sales of equity investments and other assets	172	59
Change in restricted cash	-15	166
Other	-76	20
Net cash used in investing activities	-3,734	-3,566
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	2,217	2,993
Proceeds from the issuance of common stock related to employee benefit plans	24	8
Payments for the redemption of long-term debt	-2,503	-2,506
Payments for the redemption of preferred stock	'	-96
Notes payable and commercial paper	941	537
Distributions to noncontrolling interests	-45	-9
Dividends paid	-1,670	-1,636
Other	33	27
Net cash used in financing activities	-1,003	-682
Net increase in cash and cash equivalents	430	742
Cash and cash equivalents at beginning of period	1,501	1,424
Cash and cash equivalents at end of period	1,931	2,166
Significant non-cash transactions:	'	'
Accrued capital expenditures	466	383
Duke Energy Carolinas [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	933	767
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	952	865
Equity component of AFUDC	-68	-70
Community support and charitable contributions expense	'	14
Impairment charges	3	'
Deferred income taxes	47	487
Accrued pension and other post-retirement benefit costs	16	29
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	'	-7
Receivables	5	-24
Receivables from affiliated companies	-42	-37
Inventory	91	23
Other current assets	-130	35
Increase (decrease) in	'	'
Accounts payable	-167	-90
Accounts payable to affiliated companies	15	107
Taxes accrued	173	18
Other current liabilities	7	2
Other assets	23	-80
Other liabilities	21	-66
Net cash provided by operating activities	1,879	1,973
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-1,289	-1,205
Purchases of available-for-sale securities	-1,533	-1,883
Proceeds from sales and maturities of available-for-sale securities	1,516	1,847
Notes receivable from affiliated companies	-117	-213
Other	-27	-11
Net cash used in investing activities	-1,450	-1,465
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Payments for the redemption of long-term debt	-42	'
Dividends or distributions to parent	-376	-500
Other	'	-2
Net cash used in financing activities	-418	-502
Net increase in cash and cash equivalents	11	6
Cash and cash equivalents at beginning of period	23	19
Cash and cash equivalents at end of period	34	25
Significant non-cash transactions:	'	'
Accrued capital expenditures	177	111
Progress Energy [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income (loss)	735	479
Net Income (Loss) Attributable to Parent	733	477
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	985	764
Equity component of AFUDC	-18	-39
Community support and charitable contributions expense	'	20
Gains (losses) on sales of other assets	1	3
Impairment charges	-16	368
Deferred income taxes	231	384
Accrued pension and other post-retirement benefit costs	20	158
Contributions to qualified pension plans	'	-27
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	28	33
Receivables	-162	-219
Receivables from affiliated companies	-32	12
Inventory	-45	79
Other current assets	-147	-102
Increase (decrease) in	'	'
Accounts payable	-73	-227
Accounts payable to affiliated companies	142	25
Taxes accrued	166	161
Other current liabilities	-96	113
Other assets	-126	-223
Other liabilities	-9	-64
Net cash provided by operating activities	1,584	1,698
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-1,383	-1,739
Purchases of available-for-sale securities	-609	-1,651
Proceeds from sales and maturities of available-for-sale securities	594	1,630
Net proceeds from the sales of equity investments and other assets	2	'
Notes receivable from affiliated companies	-89	-103
Other	-39	12
Net cash used in investing activities	-1,524	-1,851
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	875	545
Payments for the redemption of long-term debt	-479	-1,194
Payments for the redemption of preferred stock	'	-96
Notes payable to affiliated companies	-391	740
Distributions to noncontrolling interests	-37	-2
Other	-39	-5
Net cash used in financing activities	-71	-12
Net increase in cash and cash equivalents	-11	-165
Cash and cash equivalents at beginning of period	58	231
Cash and cash equivalents at end of period	47	66
Significant non-cash transactions:	'	'
Accrued capital expenditures	159	199
Duke Energy Progress [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	391	362
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	570	507
Equity component of AFUDC	-17	-33
Community support and charitable contributions expense	'	20
Gains (losses) on sales of other assets	-1	-1
Impairment charges	-18	22
Deferred income taxes	152	272
Accrued pension and other post-retirement benefit costs	-5	74
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	9	-11
Receivables	33	-75
Receivables from affiliated companies	-7	4
Inventory	-53	32
Other current assets	-97	-41
Increase (decrease) in	'	'
Accounts payable	-67	-168
Accounts payable to affiliated companies	102	'
Taxes accrued	95	63
Other current liabilities	-46	-75
Other assets	-28	-87
Other liabilities	-23	-77
Net cash provided by operating activities	990	788
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-871	-998
Purchases of available-for-sale securities	-371	-460
Proceeds from sales and maturities of available-for-sale securities	351	438
Other	-25	3
Net cash used in investing activities	-916	-1,017
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	650	545
Payments for the redemption of long-term debt	-169	-451
Payments for the redemption of preferred stock	'	-62
Notes payable to affiliated companies	-340	217
Dividends or distributions to parent	-224	'
Other	-6	-6
Net cash used in financing activities	-89	243
Net increase in cash and cash equivalents	-15	14
Cash and cash equivalents at beginning of period	21	18
Cash and cash equivalents at end of period	6	32
Significant non-cash transactions:	'	'
Accrued capital expenditures	107	122
Duke Energy Florida [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	455	250
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	413	240
Equity component of AFUDC	-1	-6
Gains (losses) on sales of other assets	'	-1
Impairment charges	2	346
Deferred income taxes	194	229
Accrued pension and other post-retirement benefit costs	22	66
Contributions to qualified pension plans	'	-27
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	13	37
Receivables	-118	-127
Receivables from affiliated companies	-37	19
Inventory	7	46
Other current assets	-90	-132
Increase (decrease) in	'	'
Accounts payable	32	30
Accounts payable to affiliated companies	29	-19
Taxes accrued	68	152
Other current liabilities	-50	203
Other assets	-92	-128
Other liabilities	-53	-44
Net cash provided by operating activities	794	1,134
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-513	-734
Purchases of available-for-sale securities	-238	-1,191
Proceeds from sales and maturities of available-for-sale securities	243	1,192
Notes receivable from affiliated companies	-182	177
Other	-14	'
Net cash used in investing activities	-704	-556
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	225	'
Payments for the redemption of long-term debt	-10	-435
Payments for the redemption of preferred stock	'	-34
Notes payable to affiliated companies	-181	'
Dividends or distributions to parent	-124	-225
Other	-1	'
Net cash used in financing activities	-91	-694
Net increase in cash and cash equivalents	-1	-116
Cash and cash equivalents at beginning of period	16	131
Cash and cash equivalents at end of period	15	15
Significant non-cash transactions:	'	'
Accrued capital expenditures	52	76
Duke Energy Ohio [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	-558	96
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	205	268
Equity component of AFUDC	-3	'
Gains (losses) on sales of other assets	'	-5
Impairment charges	889	'
Deferred income taxes	-285	76
Accrued pension and other post-retirement benefit costs	6	12
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	124	'
Receivables	-66	-6
Receivables from affiliated companies	62	1
Inventory	-16	29
Other current assets	56	-8
Increase (decrease) in	'	'
Accounts payable	-42	-56
Accounts payable to affiliated companies	-6	4
Taxes accrued	13	-29
Other current liabilities	46	10
Other assets	-8	3
Other liabilities	-20	-63
Net cash provided by operating activities	397	332
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-242	-318
Net proceeds from the sales of equity investments and other assets	'	11
Notes receivable from affiliated companies	-178	-45
Other	'	1
Net cash used in investing activities	-420	-351
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	'	450
Payments for the redemption of long-term debt	-406	-257
Notes payable to affiliated companies	520	-176
Dividends or distributions to parent	-100	'
Other	1	-2
Net cash used in financing activities	15	15
Net increase in cash and cash equivalents	-8	-4
Cash and cash equivalents at beginning of period	36	31
Cash and cash equivalents at end of period	28	27
Significant non-cash transactions:	'	'
Accrued capital expenditures	21	20
Duke Energy Indiana [Member]	'	'
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss) Attributable to Parent	301	276
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion (including amortization of nuclear fuel)	311	230
Equity component of AFUDC	-10	-11
Deferred income taxes	136	190
Accrued pension and other post-retirement benefit costs	12	19
(Increase) decrease in	'	'
Net realized and unrealized mark-to-market and hedging transactions	'	-31
Receivables	-20	15
Receivables from affiliated companies	72	-19
Inventory	-30	-33
Other current assets	40	27
Increase (decrease) in	'	'
Accounts payable	-44	-22
Accounts payable to affiliated companies	4	-7
Taxes accrued	-36	16
Other current liabilities	3	-9
Other assets	-15	2
Other liabilities	44	-78
Net cash provided by operating activities	768	565
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Capital expenditures	-462	-387
Purchases of available-for-sale securities	-17	-7
Proceeds from sales and maturities of available-for-sale securities	13	6
Notes receivable from affiliated companies	96	-69
Other	4	-4
Net cash used in investing activities	-366	-461
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from the issuance of long-term debt	'	498
Payments for the redemption of long-term debt	-2	-403
Notes payable to affiliated companies	61	-81
Dividends or distributions to parent	-451	-125
Other	-1	-4
Net cash used in financing activities	-393	-115
Net increase in cash and cash equivalents	9	-11
Cash and cash equivalents at beginning of period	15	36
Cash and cash equivalents at end of period	24	25
Significant non-cash transactions:	'	'
Accrued capital expenditures	$64	$36

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 Translation 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]

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 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]

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

Pension and OPEB Related Adjustments [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

'

7,465

2,783

-42

'

-25

10,181

4

5,127

2,159

2,968

4,799

1,762

3,037

'

'

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)

1,984

'

'

1,977

'

'

'

'

1,977

'

'

'

'

'

479

'

'

477

'

'

'

477

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Noncontrolling Interest

7

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

1,977

'

'

'

'

'

'

'

'

'

767

767

'

'

477

'

'

'

'

'

'

'

'

362

'

362

250

'

250

'

'

96

'

'

96

'

276

'

'

276

'

Other comprehensive income (loss), net of tax

-78

'

'

'

-133

56

-2

5

-74

-4

1

'

1

'

8

'

'

'

3

'

5

8

'

'

'

'

-1

'

'

'

-1

1

'

'

'

1

-2

'

'

'

-2

Common stock issuances, including dividend reinvestment and employee benefits

38

'

38

'

'

'

'

'

38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-1,636

'

'

-1,636

'

'

'

'

-1,636

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-225

'

-225

'

'

'

'

'

'

'

-125

'

'

-125

'

Distributions to parent

'

'

'

'

'

'

'

'

'

'

-500

-500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premium on the redemption of preferred stock of subsidiaries

-3

'

'

-3

'

'

'

'

-3

'

'

'

'

'

-3

'

'

-3

'

'

'

-3

'

-2

'

-2

-1

'

-1

'

'

'

'

'

'

'

'

'

'

'

'

Changes in noncontrolling interest in subsidiaries

-9

'

'

'

'

'

'

'

'

-9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distributions to noncontrolling interest in subsidiaries

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2

'

'

'

'

'

'

'

-2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Sep. 30, 2013

'

'

'

'

'

'

'

'

'

'

10,140

10,155

-14

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2013

41,237

1

39,317

2,227

-249

-44

-2

-85

41,165

72

'

'

'

'

10,667

'

7,465

3,257

-39

'

-20

10,663

4

5,487

2,159

3,328

4,822

1,762

3,061

'

-1

5,263

762

4,882

-381

'

3,857

1

1,384

2,469

3

Balance, in shares at Sep. 30, 2013

'

706,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning member's equity at Jun. 30, 2013

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

1,008

'

'

'

'

'

'

'

'

'

'

'

'

'

342

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Noncontrolling Interest

4

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

1,004

'

'

'

'

'

'

'

'

'

342

'

'

'

341

'

'

'

'

'

'

'

'

175

'

'

197

'

'

'

'

59

'

'

'

'

104

'

'

'

'

Other comprehensive income (loss), net of tax

-4

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Sep. 30, 2013

'

'

'

'

'

'

'

'

'

'

10,140

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2013

41,237

'

'

'

'

'

'

'

'

'

'

'

'

'

10,667

'

7,465

'

'

'

'

'

'

5,487

'

'

4,822

1,762

'

'

'

5,263

762

4,882

'

'

3,857

'

'

'

'

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

'

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

'

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)

1,789

'

'

1,786

'

'

'

'

1,786

'

'

'

'

'

735

'

'

733

'

'

'

733

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Noncontrolling Interest

3

'

'

'

'

'

'

'

'

3

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

1,786

'

'

'

'

'

'

'

'

'

933

933

'

'

733

'

'

'

'

'

'

'

'

391

'

391

455

'

'

'

'

-558

'

'

-558

'

301

'

'

301

'

Other comprehensive income (loss), net of tax

-52

'

'

'

-55

-5

2

1

-57

5

2

'

2

'

8

'

'

'

5

1

2

8

'

'

'

'

1

'

'

1

'

'

'

'

'

'

'

'

'

'

'

Common stock issuances, including dividend reinvestment and employee benefits

23

'

23

'

'

'

'

'

23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-1,670

'

'

-1,670

'

'

'

'

-1,670

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-224

'

-224

-124

'

-124

'

'

-100

'

-100

'

'

-451

'

'

-451

'

Distributions to parent

'

'

'

'

'

'

'

'

'

'

-376

-376

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distributions to noncontrolling interest in subsidiaries

-45

'

'

'

'

'

'

'

'

-45

'

'

'

'

-37

'

'

'

'

'

'

'

-37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer of service company net assets to Duke Energy

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-538

'

'

-538

'

'

'

-538

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Sep. 30, 2014

'

'

'

'

'

'

'

'

'

'

10,909

10,922

-12

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2014

41,453

1

39,388

2,479

-362

-45

2

-51

41,412

41

'

'

'

'

11,032

'

7,467

3,647

-38

1

-14

11,063

-31

5,792

2,159

3,633

5,129

1,762

3,367

'

'

4,611

762

4,782

-933

'

3,789

1

1,384

2,401

3

Balance, in shares at Sep. 30, 2014

707,000,000

707,000,000

'

'

'

'

'

'

'

'

'

'

'

'

100

'

'

'

'

'

'

'

'

160,000,000

'

'

100

'

'

'

'

89,663,086

'

'

'

'

53,913,701

'

'

'

'

Beginning member's equity at Jun. 30, 2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

1,269

'

'

'

'

'

'

'

'

'

'

'

'

'

330

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Noncontrolling Interest

-5

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

1,274

'

'

'

'

'

'

'

'

'

377

'

'

'

329

'

'

'

'

'

'

'

'

157

'

'

205

'

'

'

'

439

'

'

'

'

101

'

'

'

'

Other comprehensive income (loss), net of tax

-97

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending member's equity at Sep. 30, 2014

'

'

'

'

'

'

'

'

'

'

10,909

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance at Sep. 30, 2014

$41,453

'

'

'

'

'

'

'

'

'

'

'

'

'

$11,032

'

$7,467

'

'

'

'

'

'

$5,792

'

'

$5,129

$1,762

'

'

'

$4,611

$762

'

'

'

$3,789

'

'

'

'

Balance, in shares at Sep. 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	9 Months Ended
	Sep. 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	18
	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 (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 regulated public utility primarily engaged in the generation, transmission and distribution of electricity and the transportation and sale of natural gas 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 conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers. 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 has agreed to sell Duke Energy Ohio's nonregulated Midwest generation business, which sells power into wholesale energy markets, to Dynegy Inc. (Dynegy). See Note 2 for additional information.
	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 FERC. Substantially all of Duke Energy Indiana’s operations qualify for regulatory accounting.
	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.
	On August 21, 2014, Duke Energy Commercial Enterprises, Inc., an indirect wholly owned subsidiary of Duke Energy Corporation, and Duke Energy SAM, LLC, a wholly owned subsidiary of Duke Energy Ohio, entered into a purchase and sale agreement (PSA) with a subsidiary of Dynegy whereby Dynegy will acquire Duke Energy Ohio’s nonregulated Midwest generation business (Disposal Group). The results of operations of the nonregulated Midwest generation business have been classified as Discontinued Operations on the Condensed Consolidated Statements of Operations for the current and prior periods presented. Duke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. See Note 2 for additional information.
	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.
	Certain prior year amounts have been reclassified to conform to the current year presentation.
	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. This table excludes amounts included in assets held for sale (AHFS).
	(in millions)	September 30, 2014				December 31, 2013
	Duke Energy	$	798			$	937
	Duke Energy Carolinas	285				323
	Progress Energy	232				189
	Duke Energy Progress	131				120
	Duke Energy Florida	101				69
	Duke Energy Ohio	—				55
	Duke Energy Indiana	26				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 13 for further information. These receivables for unbilled revenues are shown in the table below.
	(in millions)	September 30, 2014				December 31, 2013
	Duke Energy Ohio	$	54			$	89
	Duke Energy Indiana	94				144
	AMOUNTS ATTRIBUTABLE TO CONTROLLING INTERESTS
	The following table presents Net Income Attributable to Duke Energy Corporation for continuing operations and discontinued operations for the three and nine months ended September 30, 2014 and 2013.
		Three Months Ended September 30,
		2014							2013
	(in millions)	Duke Energy			Progress Energy				Duke Energy			Progress Energy
	Income from Continuing Operations	$	891		$	330			$	946		$	328
	Income of Continuing Operations Attributable to Noncontrolling Interests	3			1				4			1
	Income from Continuing Operations Attributable to Duke Energy Corporation	$	888		$	329			$	942		$	327
	Income From Discontinued Operations, net of tax	$	378		$	—			$	62		$	14
	Loss of Discontinued Operations attributable to Noncontrolling Interests, net of tax	(8		)	—				—			—
	Discontinued Operations Attributable to Duke Energy Corporation, net of tax	$	386		$	—			$	62		$	14
	Net income	$	1,269		$	330			$	1,008		$	342
	Net (Loss) Income Attributable to Noncontrolling Interest	(5		)	1				4			1
	Net Income Attributable to Duke Energy Corporation	$	1,274		$	329			$	1,004		$	341
		Nine Months Ended September 30,
		2014							2013
	(in millions)	Duke Energy			Progress Energy				Duke Energy			Progress Energy
	Income from Continuing Operations	$	2,367		$	741			$	1,902		$	469
	(Loss) Income of Continuing Operations Attributable to Noncontrolling Interests	11			2				12			2
	Income from Continuing Operations Attributable to Duke Energy Corporation	$	2,356		$	739			$	1,890		$	467
	(Loss) Income From Discontinued Operations, net of tax	$	(578	)	$	(6	)		$	82		$	10
Income (Loss) of Discontinued Operations attributable to Noncontrolling Interests, net of tax	(8		)	—				(5		)	—
Discontinued Operations Attributable to Duke Energy Corporation, net of tax	$	(570	)	$	(6	)		$	87		$	10
Net income	$	1,789		$	735			$	1,984		$	479
Net Income Attributable to Noncontrolling Interest	3			2				7			2
Net Income Attributable to Duke Energy Corporation	$	1,786		$	733			$	1,977		$	477
ACCUMULATED OTHER COMPREHENSIVE INCOME
For the three and nine months ended September 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 September 30,								Nine Months Ended September 30,
(in millions)	2014				2013				2014				2013
Duke Energy	$	101			$	168			$	416			$	457
Duke Energy Carolinas	4				46				93				124
Progress Energy	63				89				214				230
Duke Energy Progress	—				33				56				88
Duke Energy Florida	63				56				158				142
Duke Energy Ohio	24				24				80				77
Duke Energy Indiana	10				9				29				26
During the third quarter of 2014, the North Carolina gross receipts tax was terminated due to the North Carolina Tax Simplification and Rate Reduction Act. The North Carolina gross receipts tax is no longer imposed effective July 1, 2014.
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 September 30, 2014.
ASC 205 — Reporting Discontinued Operations. In April 2014, the Financial Accounting Standards Board (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	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions and Dispositions	'
	ACQUISITIONS AND DISPOSITIONS
	Purchase of NCEMPA's Generation
	On September 5, 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 megawatts (MW) at Brunswick Nuclear Station, Shearon Harris Nuclear Station (Harris), 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 conditions precedent including state and federal regulatory approvals and legislative action required prior to completing the transaction. On October 10, 2014, Duke Energy Progress filed with the FERC for approval to purchase NCEMPA's interests in the generation assets. The agreement requires the transaction to be completed by the end of 2016.
	Midwest Generation Exit
	On August 21, 2014, Duke Energy Commercial Enterprises, Inc., an indirect wholly owned subsidiary of Duke Energy Corporation, and Duke Energy SAM, LLC, a wholly owned subsidiary of Duke Energy Ohio, entered into a PSA with a subsidiary of Dynegy whereby Dynegy will acquire Duke Energy Ohio’s Disposal Group for approximately $2.8 billion in cash subject to adjustments at closing for changes in working capital and capital expenditures. The completion of the transaction is conditioned on expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, approval by FERC, and the release of certain credit support obligations. Closing is expected to be completed in the fourth quarter of 2014 or the first quarter of 2015.
	The Disposal Group was 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 intended to sell it with the Disposal Group. 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.
	Duke Energy Ohio had triggered held for sale accounting treatment on March 31, 2014. The assets and associated liabilities of the Disposal Group are classified as held for sale in Duke Energy's and Duke Energy Ohio's Condensed Consolidated Balance Sheet at September 30, 2014.
	Beginning in the third quarter of 2014, the results of operations of the Disposal Group are required to be classified as discontinued operations for current and prior periods in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Income. Certain costs that are not material have remained in continuing operations that may be eliminated as a result of the sale. Results of discontinued operations were as follows.
	Duke Energy
		Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013			2014			2013
	Operating Revenues	$	620		$	491		$	1,233		$	1,369
	Estimated gain (loss) on disposition	460			—			(847		)	—
	Income (loss) before income taxes	$	623		$	82		$	(864	)	$	126
	Income tax expense (benefit)	218			34			(321		)	43
	Income (loss) from discontinued operations of the Disposal Group	405			48			(543		)	83
	Other, net of tax(a)	(27		)	14			(35		)	(1		)
	Income (Loss) from Discontinued Operations, net of tax	$	378		$	62		$	(578	)	$	82
	(a)	Other discontinued operations relates to prior sales of businesses and includes indemnifications provided for certain legal, tax and environmental matters, and foreign currency translation adjustments.
	Duke Energy Ohio
		Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013			2014			2013
	Operating Revenues	$	536		$	389		$	853		$	1,054
	Estimated gain (loss) on disposition	466			—			(878		)	—
	Income (loss) before income taxes	$	647		$	65		$	(917	)	$	71
	Income tax expense (benefit)	234			30			(320		)	32
	Income (Loss) from Discontinued Operations, net of tax	$	413		$	35		$	(597	)	$	39
	The Duke Energy and Duke Energy Ohio held for sale assets include net pretax impairments of approximately $847 million and $878 million, respectively, for the nine months ended September 30, 2014. During the first quarter of 2014 an impairment was recorded to write-down the carrying amount of the assets to the estimated fair value of the business, less estimated costs to sell. For the three months ended September 30, 2014, a reversal of the pretax impairments was recorded of approximately $460 million and $466 million for Duke Energy and Duke Energy Ohio, respectively, based on the expected selling price to Dynegy less cost to sell. These losses and gains were included in Income (Loss) from Discontinued Operations, net of tax in the Condensed Consolidated Statements of Operations and Comprehensive Income. The impairment will be updated, if necessary, based on the final execution of the purchase sale agreement and any changes in estimated fair value as additional information related to the potential transaction becomes available.
	Commercial Power has a revolving credit agreement (RCA) that is used to support the operations of the nonregulated Midwest generation business. Interest expense associated with the RCA has been allocated to discontinued operations. No other interest expense related to corporate level debt has been allocated to discontinued operations.
	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 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 may not agree to amounts presented in the Duke Energy Condensed Consolidated Balance Sheets.
		September 30, 2014
	(in millions)	Duke Energy			Duke Energy Ohio
	Current assets	$	335		$	284
	Investments and other assets	43			38
	Property, plant and equipment	2,675			2,644
	Total assets held for sale	$	3,053		$	2,966
	Current liabilities	$	284		$	269
	Deferred credits and other liabilities	57			57
	Total liabilities associated with assets held for sale	$	341		$	326
	Duke Energy Ohio will continue to have transactions with the Disposal Group after the divestiture is complete. Duke Energy Ohio has a power purchase agreement with the Disposal Group, which extends through May 2015, for a portion of its standard service offer (SSO) supply requirement. In addition, for a period of up to 12 months, Duke Energy may provide transition services to Dynegy. Duke Energy will be reimbursed for transition services provided. The continuing cash flows are not expected to be material and are not considered direct cash flows. These arrangements do not allow Duke Energy or Duke Energy Ohio to significantly influence the operations of the Disposal Group once the sale is complete.
	See Notes 4 and 5 for a discussion of contingencies related to the Disposal Group that will be retained by Duke Energy Ohio subsequent to the sale.

Business_Segments

Business Segments	9 Months Ended
	Sep. 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 builds, develops and operates renewable generation and energy transmission projects throughout the continental U.S. As discussed in Note 2, Duke Energy entered into an agreement to sell Commercial Power's nonregulated Midwest generation business to Dynegy in a transaction that is expected to close in the fourth quarter of 2014 or the first quarter of 2015. As a result of this divestiture, the results of operations of the nonregulated Midwest generation business have been reclassified to Discontinued Operations on the Condensed Consolidated Statements of Operations. Certain costs such as interest and general and administrative expenses previously allocated to the Disposal Group were not reclassified to discontinued operations.
	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 September 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	5,975		$	366		$	50		$	6,391		$	4		$	—		$	6,395
	Intersegment revenues	11			—			—			11			21			(32		)	—
	Total revenues	$	5,986		$	366		$	50		$	6,402		$	25		$	(32	)	$	6,395
	Segment income (loss)(a)	$	920		$	80		$	(17	)	$	983		$	(92	)	$	(3	)	$	888
	Add back noncontrolling interests component																			3
	Income from discontinued operations, net of tax																			378
	Net income																			$	1,269
	Segment assets	$	105,172		$	5,159		$	6,196		$	116,527		$	2,944		$	185		$	119,656
	(a)    Other includes costs to achieve the Progress Energy merger.
		Three Months Ended September 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)	$	5,768		$	370		$	56		$	6,194		$	23		$	—		$	6,217
	Intersegment revenues	18			—			2			20			24			(44		)	—
	Total revenues	$	5,786		$	370		$	58		$	6,214		$	47		$	(44	)	$	6,217
	Segment income (loss)(a)(b)	$	923		$	116		$	(28	)	$	1,011		$	(64	)	$	(5	)	$	942
	Add back noncontrolling interests component																			4
	Income from discontinued operations, net of tax																			62
	Net income																			$	1,008
	(a)	In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Nine Months Ended September 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	17,041		$	1,111		$	195		$	18,347		$	19		$	—		$	18,366
	Intersegment revenues	33			—			—			33			60			(93		)	—
	Total revenues	$	17,074		$	1,111		$	195		$	18,380		$	79		$	(93	)	$	18,366
	Segment income (loss)(a)(b)	$	2,346		$	356		$	(70	)	$	2,632		$	(269	)	$	(7	)	$	2,356
	Add back noncontrolling interests component																			11
	Loss from discontinued operations, net of tax																			(578		)
	Net income																			$	1,789
	(a)	Commercial Power recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Nine Months Ended September 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)(c)(d)	$	15,731		$	1,168		$	184		$	17,083		$	49		$	—		$	17,132
	Intersegment revenues	35			—			5			40			64			(104		)	—
	Total revenues	$	15,766		$	1,168		$	189		$	17,123		$	113		$	(104	)	$	17,132
	Segment income (loss)(a)(b)(c)(d)(e)(f)	$	1,932		$	300		$	(54	)	$	2,178		$	(278	)	$	(10	)	$	1,890
	Add back noncontrolling interest																			12
	Income from discontinued operations, net of tax																			82
	Net income																			$	1,984
	(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 June 2013, 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)	In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
(d)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
(e)	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 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.
(f)	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.
As discussed in Note 2, Duke Energy entered into an agreement to sell Commercial Power's nonregulated Midwest generation business to Dynegy in a transaction that is expected to be completed in the fourth quarter of 2014 or the first quarter of 2015. As a result of this divestiture, the results of operations of the nonregulated Midwest generation business have been reclassified to Discontinued Operations on the Condensed Consolidated Statements of Operations and Comprehensive Income. Amounts remaining in Commercial Power relate to assets not included in the Disposal Group. Certain costs such as interest and general and administrative expenses previously allocated to the Disposal Group were not reclassified to discontinued operations.
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 9 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 September 30, 2014
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues	$	440		$	6		$	446		$	—		$	—		$	446
Intersegment revenues	1			—			1			—			(1		)	—
Total revenues	$	441		$	6		$	447		$	—		$	(1	)	$	446
Segment income (loss)	$	43		$	(13	)	$	30		$	(4	)	$	—		$	26
Income from discontinued operations, net of tax																$	413
Net income																439
Segment assets	$	7,297		$	3,266		$	10,563		$	131		$	(622	)	$	10,072
	Three Months Ended September 30, 2013
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues	$	421		$	17		$	438		$	—		$	—		$	438
Total revenues	$	421		$	17		$	438		$	—		$	—		$	438
Segment income (loss)	$	42		$	(13	)	$	29		$	(5	)	$	—		$	24
Income from discontinued operations, net of tax																35
Net income																$	59
	Nine Months Ended September 30, 2014
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues	$	1,416		$	17		$	1,433		$	—		$	—		$	1,433
Intersegment revenues	1			—			1			—			(1		)	—
Total revenues	$	1,417		$	17		$	1,434		$	—		$	(1	)	$	1,433
Segment income (loss)(a)	$	151		$	(101	)	$	50		$	(11	)	$	—		$	39
Loss from discontinued operations, net of tax																(597		)
Net loss																$	(558	)
a)	Duke Energy Ohio recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
	Nine Months Ended September 30, 2013
(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
Unaffiliated revenues	$	1,317		$	32		$	1,349		$	—		$	—		$	1,349
Total revenues	$	1,317		$	32		$	1,349		$	—		$	—		$	1,349
Segment income (loss)	$	122		$	(51	)	$	71		$	(14	)	$	—		$	57
Income from discontinued operations, net of tax																39
Net income																$	96
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 $58 million and $64 million for the three months ended September 30, 2014 and 2013, respectively and $181 million and $235 million for the nine months ended September 30, 2014 and 2013, respectively. The following table summarizes the net loss for Other at each of these registrants.
	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013			2014			2013
Duke Energy Carolinas	$	(19	)	$	(26	)	$	(67	)	$	(69	)
Progress Energy	(48		)	(72		)	(145		)	(205		)
Duke Energy Progress	(10		)	(20		)	(23		)	(40		)
Duke Energy Florida	(5		)	(6		)	(16		)	(18		)
Duke Energy Indiana	(3		)	(5		)	(10		)	(13		)
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 September 30, 2014.

Regulatory_Matters

Regulatory Matters

9 Months Ended

Sep. 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 occurred on 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 NCUC Public Staff (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 occurred on 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 allowance for funds used during construction (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. On August 20, 2014, the NCSC affirmed the NCUC's order approving Duke Energy Progress' rate of return and capital structure.

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 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 September 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 2013 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. Settlement was reached in October 2014, subject to FERC approval, for changes to the depreciation rates and conforming changes to the wholesale formula rates. The agreement will have no material or adverse impact to the rates originally proposed by Duke Energy Progress, and Duke Energy Progress will receive cost recovery for early retired plants previously included in the depreciation rates.

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 forgo 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 pending resolution of its litigation against the federal government as a result of the Department of Energy's breach of its obligation to accept spent nuclear fuel. The regulatory asset associated with the original power uprate project to increase generating capacity will continue to be recovered through the Nuclear Cost Recovery Clause (NCRC) over an estimated seven year period that began in 2013.

Through September 30, 2014, Duke Energy Florida deferred $1,373 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 $268 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.

September 30, 2014

Remaining Amount to be Refunded

(in millions)

Total

Refunded to date

2014

2015

2016

2012 Settlement refund

$

288

$

233

$

35

$

10

$

10

Retirement decision refund

100

—

—

40

60

NEIL proceeds

490

449

41

—

—

Total customer refunds

$

878

682

76

50

70

Accelerated regulatory asset recovery

(130

)

(28

)

(9

)

(37

)

(56

)

Net customer refunds

$

748

$

654

$

67

$

13

$

14

Levy

On July 28, 2008, Duke Energy Florida applied to the NRC for a 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.

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.

On October 27, 2014, the FPSC approved Duke Energy Florida rates for 2015 for Levy as filed and consistent with those established in the 2013 Revised and Restated Settlement Agreement. 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 September 30, 2014, Duke Energy Florida has a net uncollected investment in Levy of approximately $207 million, including AFUDC. Of this amount, $54 million is included in Regulatory assets, $120 million related to land and the COL is included in Net, property, plant and equipment, and $33 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 Energy Complex (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. On August 26, 2014, Duke Energy Florida requested the FPSC withdraw consideration for the Suwannee project so that Duke Energy Florida could pursue further negotiations on an alternative power plant acquisition. On October 2, 2014, the FPSC approved the requests for the Citrus County plant and the uprate project at the Hines facility. Additional environmental and governmental approvals will be sought for the Citrus County project. The Hines uprate project is expected to be completed no later than 2017.

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 $22 million for the three months ended September 30, 2013 and $95 million for the nine months ended September 30, 2013. Duke Energy Florida had no cost of removal reserves eligible for amortization to income remaining after December 31, 2013.

Duke Energy Ohio

Ohio River Fuel Spill

On August 18, 2014, approximately 9,000 gallons of fuel oil was inadvertently discharged into the Ohio River during a fuel oil transfer at the W.C. Beckjord generating plant. The total costs to be incurred related to the clean-up of the oil spill are not expected to be material.

2014 Electric Security Plan

On May 29, 2014, Duke Energy Ohio filed an application for approval of an SSO in the form of an 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. An evidentiary hearing for this case commenced on October 22, 2014. 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. Briefs have been submitted in the case. No bond amount or date for oral argument has been set. Duke Energy Ohio suspended billing of the MGP rider in June 2014. Amounts collected under the rider prior to suspension are immaterial. 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 Planning (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 September 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-Sep-14

Adjustments

Reductions

Duke Energy Ohio

$

95

$

3

$

(3

)

$

95

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 operations and maintenance, taxes and return over the project lives, the number of years in service for the projects and the allocation to Duke Energy Ohio.

Any liability related to the MISO MVP matter attributable to the Disposal Group will not be transferred to Dynegy upon closing of the disposal of the Midwest generation business.

Duke Energy Indiana

Edwardsport Integrated Gasification Combined Cycle (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 February 2015.

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 requested to seek transfer to the Indiana Supreme Court. On November 7, 2014, the Indiana Supreme Court denied the Joint Intervenors' request to transfer the appeal of these proceedings. The ninth and tenth semi-annual IGCC rider orders have also been appealed. On August 21, 2014, the Indiana Court of Appeals affirmed the IURC order in the tenth IGCC rider proceeding, and on October 29, 2014, denied Joint Intervenors' request for rehearing. On September 8, 2014, the Indiana Court of Appeals remanded the IURC order in the ninth IGCC rider proceeding back to the IURC for further findings concerning approximately $61 million of financing charges Joint Intervenors claimed were caused by construction delay and a ratemaking issue concerning the in-service date determination for tax purposes.

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. In addition, although the IURC approved fuel adjustment clause recovery for the period December 2013 through March 2014, it determined such fuel costs reasonably related to the operational performance of the Edwardsport IGCC plant shall be subject to refund pending the outcome of the twelfth and thirteenth semi-annual IGCC riders.

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

Grid Infrastructure Improvement Plan

On August 29, 2014, Duke Energy Indiana filed a seven-year grid infrastructure improvement plan with the IURC with an estimated cost of $1.9 billion, focusing on the reliability, integrity and modernization of the transmission and distribution system. If approved, eighty percent of the costs will be recovered through a rate tracker. The remaining twenty percent are subject to recovery through future rate case proceedings. Hearings are set for December 2014 and Duke Energy Indiana expects a decision in the second quarter of 2015.

OTHER REGULATORY MATTERS

Atlantic Coast Pipeline

On September 2, 2014, Duke Energy, Dominion Resources (Dominion), Piedmont Natural Gas and AGL Resources announced the formation of a joint venture, Atlantic Coast Pipeline, LLC, to build and own the proposed Atlantic Coast Pipeline (ACP), a 550-mile interstate natural gas pipeline. The ACP is designed to meet the needs identified in requests for proposals by Duke Energy Carolinas, Duke Energy Progress and Piedmont Natural Gas. Dominion will build and operate the ACP and will own 45 percent. Duke Energy will have a 40 percent ownership of the pipeline through its Commercial Power segment. The remaining share will be owned by Piedmont Natural Gas and AGL Resources. Duke Energy Carolinas and Duke Energy Progress, among others, will be customers of the pipeline. Purchases will be made under several 20-year supply contracts, subject to state regulatory approval. In October 2014, the NCUC and PSCSC approved the Duke Energy Carolinas and Duke Energy Progress requests to enter into certain affiliate agreements, pay compensation to ACP and to grant a waiver of certain Code of Conduct provisions relating to contractual and jurisdictional matters. The project will require FERC approval, which the joint venture will seek to secure by summer 2016. The estimated in-service date of the pipeline is late 2018.

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 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. Several intervenors filed requests for rehearing challenging various aspects of the FERC approval. On October 29, 2014, FERC denied all of the requests for rehearing.

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 or before 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. The City of New Bern filed a protest and requested that FERC order additional mitigation. On October 29, 2014, FERC ordered that the amount of the stub mitigation be increased from 25 MW to 129 MW. The stub mitigation is Duke’s commitment to set aside for third parties a certain quantity of firm transmission capacity from Duke Energy Carolinas to Duke Energy Progress during summer off-peak hours. FERC also ordered that Duke Energy operate certain phase shifters to create additional import capability and that such operation be monitored by an independent monitor. Duke Energy does not expect the costs to comply with this order to be material.

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 United States Environmental Protection Agency (EPA) regulations recently approved or proposed.

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-Sep-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)

$

256

$

19

$

109

$

109

$

9

$

119

(a)

Included in Property, plant and equipment, net as of September 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 and were retired October 1, 2014.

(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	9 Months Ended
	Sep. 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.
		Nine Months Ended September 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	34			(1		)	4			3			1			28			3
	Cash reductions	(8		)	—			(6		)	(4		)	(2		)	(1		)	(1		)
	Balance at end of period	$	105		$	10		$	25		$	7		$	18		$	54		$	9
		Nine Months Ended September 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	6			—			5			1			4			(1		)	1
	Cash reductions	(17		)	—			(6		)	(2		)	(4		)	(8		)	(2		)
	Balance at end of period	$	64		$	12		$	32		$	13		$	19		$	6		$	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	$	83
	Duke Energy Carolinas	25
	Progress Energy	9
	Duke Energy Progress	2
	Duke Energy Florida	7
	Duke Energy Ohio	42
	Duke Energy Indiana	7
	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 an adjacent 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 nine months ended September 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 the EPA. Other costs related to the Dan River release including future regulatory directives, natural resources damages, pending litigation, future claims or litigation, and long-term environmental impact costs cannot be reasonably estimated at this time.
	Duke Energy 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. Each site is unique, and site-specific engineering will help determine the most appropriate closure method for that site.
	On September 20, 2014, the North Carolina Coal Ash Management Act of 2014 (Coal Ash Act) became law. The bill (i) establishes a Coal Ash Management Commission to oversee handling of coal ash within the state; (ii) prohibits construction of new and expansion of existing ash impoundments and use of existing impoundments at retired facilities, effective October 1, 2014; (iii) requires closure of ash impoundments at Duke Energy Progress' Asheville and Sutton stations and Duke Energy Carolinas' Riverbend and Dan River stations no later than August 1, 2019; (iv) requires conversion to dry fly ash handling at active plants not retired by December 31, 2018; (v) requires conversion to dry bottom ash handling at active plants by December 31, 2019, or retirement of active plants; (vi) requires all remaining ash impoundments in North Carolina to be approved as high-risk, intermediate-risk, or low-risk no later than December 31, 2015 by The North Carolina Department of Environment and Natural Resources (DENR) with the method of closure and timing to be based upon the assigned risk, with closure no later than December 31, 2029; (vii) establishes requirements to deal with groundwater and surface water impacts from impoundments and (viii) enhances the level of regulation for structural fills utilizing coal ash. A variance procedure for compliance deadlines and modification of requirements regarding structural fills and compliance boundaries is also outlined. Provisions of the bill prohibit cost recovery for unlawful discharge of ash basin waters occurring after January 1, 2014. The Coal Ash Act includes a moratorium for any NCUC ordered rate changes to effectuate the legislation, which ends January 15, 2015. The Coal Ash Act leaves the decision on cost recovery determinations related to closure of coal combustion residuals surface impoundments (ash basins or impoundments) to the normal ratemaking processes before utility regulatory commissions. In September 2014, Duke Energy Carolinas executed a consent agreement with the South Carolina Department of Health and Environmental Control (SCDHEC) requiring the retirement of an inactive ash basin at the W.S. Lee Steam Station.
	Duke Energy Carolinas and Duke Energy Progress recorded asset retirement obligations at September 30, 2014 based upon the legal obligation for closure of coal ash basins and the disposal of related ash as a result of the Coal Ash Act and the agreement with SCDHEC. Refer to Note 7 for further discussion of the asset retirement obligations recorded at September 30, 2014.
	LITIGATION
	Duke Energy
	Ash Basin Shareholder Derivative Litigation
	Five shareholder derivative lawsuits have been filed relating to the release at Dan River and to the management of Duke Energy’s ash basins. The lawsuits were filed in Delaware Chancery Court on (i) May 21, 2014, by shareholders Edward Tansey and the Police Retirement System of St. Louis; (ii) July 18, 2014, by shareholder Robert Reese; (iii) August 5, 2014, by shareholder Leatrice Seinfeld; (iv) September 2, 2014, by the City of Birmingham; and (v) October 3, 2014, by shareholder Andrew Behar.
	The lawsuits name as defendants several current and former Duke Energy officers and directors (collectively, the “Duke Energy Defendants”). Duke Energy is named as a nominal defendant in all five lawsuits.
	All of the 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 lawsuits also assert claims against the Duke Energy Defendants for corporate waste (relating to the money Duke Energy has spent 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.
	On October 31, 2014, the Delaware Chancery Court judge issued an order consolidating the five lawsuits. 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 Chief Executive Officer (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. On August 15, 2014, the parties reached an agreement in principle to settle the litigation for an amount which, net of the expected proceeds of insurance policies, is not anticipated to have a material effect on the results of operations, cash flows or financial position of Duke Energy. The agreement in principle is subject to the execution of a term sheet, which is being negotiated, and will be submitted to the court for approval.
	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. No date has been set for oral arguments.
	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 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. 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 covering these two plants. 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 coal ash 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. On October 10, 2014, the parties were notified the case has been transferred to the North Carolina Supreme Court.
	Federal Citizens Suits
There are currently five cases filed in various North Carolina federal courts contending that the state enforcement actions discussed above do not adequately address the issues raised in the notices of intent to sue related to the Riverbend, Sutton, Cape Fear, H.F. Lee and Buck plants.
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 relating to the Riverbend plant. 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 at the Sutton plant. 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. In response to a motion filed by the SELC, on August 1, 2014, the court modified the original June 9th order to dismiss only the plaintiff's federal law claim based on hydrologic connections at Sutton Lake. The claims related to the alleged state court violations of the permits are back in the case.
On September 3, 2014, three cases were filed by various environmental groups: (i) a citizen suit in the United States Court for the Middle District of North Carolina alleging unpermitted discharges to surface water and groundwater violations at the Cape Fear plant; (ii) a citizen suit in the United States Court for the Eastern District of North Carolina alleging unpermitted discharges to surface water and groundwater violations at the H.F. Lee plant; and (iii) a citizen suit in the United States Court for the Middle District of North Carolina alleging unpermitted discharges to surface water and groundwater violations at the Buck plant.
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 Clean Air Act (CAA). The government alleges the utilities violated the CAA when undertaking certain maintenance and repair projects at certain coal plants without (i) obtaining NSR permits and (ii) installing the best available emission controls for sulfur dioxide, nitrogen oxide and particulate matter. The complaints seek the installation of pollution control technology on 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 NSR 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, claiming NSR violations for 29 projects performed at 25 of Duke Energy Carolinas’ coal-fired units. Duke Energy Carolinas asserts the projects were routine and not projected to increase emissions. The parties subsequently filed a stipulation agreeing to dismiss with prejudice all but 13 claims at 13 generating units, 11 of which have since been retired. The parties filed opposing motions for summary judgment on the remaining claims. The Court substantially denied both motions for summary judgment. A Duke Energy request for leave to file another motion for summary judgment on alternative grounds, including expiration of the applicable statute of limitations, was denied. On October 24, 2014, Duke Energy Carolinas filed a motion to certify an appeal of the statute of limitations issue to the U.S. Court of Appeals for the Fourth Circuit. That motion is pending. No trial date has been set. 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 September 30, 2014, there were 61 asserted claims for non-malignant cases with the cumulative relief sought of up to $13 million, and 23 asserted claims for malignant cases with the cumulative relief sought of up to $7 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 $591 million at September 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 $864 million in excess of the self-insured retention. Receivables for insurance recoveries were $616 million at September 30, 2014, and $649 million at 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. Duke Energy Progress and Duke Energy Florida received payment of the award in September 2014. On October 16, 2014, Duke Energy Progress and Duke Energy Florida filed a new action for costs incurred from 2011 through 2013.
Duke Energy Florida
Westinghouse Contract Litigation
On March 28, 2014 Duke Energy Florida filed a lawsuit against 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 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.
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 alleged damages under the EPC 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. Trial is set for February 2016. It is not possible to predict the outcome of the litigation and whether Duke Energy Florida will incur any liability for terminating the EPC 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.
Any liability related to the lawsuit attributable to the Disposal Group will not be transferred to Dynegy upon closing of the disposal of the Midwest generation business.
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. The arbitration began on October 20, 2014 and is scheduled to continue into January 2015. 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)	September 30, 2014			December 31, 2013
Reserves for Legal Matters
Duke Energy	$	227		$	204
Progress Energy	70			78
Duke Energy Progress	9			10
Duke Energy Florida	41			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	9 Months Ended
	Sep. 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).
							Nine Months Ended September 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		0.612	%		400			—			—			400
	June 2014(b)	May-19		11.87	%		—			—			—			108
	June 2014(b)	May-21		13.68	%		—			—			—			110
	Secured Debt
	March 2014(c)	Mar-17		0.854	%		—			—			225			225
	July 2014(d)	Jul-36		5.34	%		—			—			—			129
	First Mortgage Bonds
	March 2014(e)	Mar-44		4.375	%		—			400			—			400
	March 2014(e)	Mar-17		0.433	%		—			250			—			250
	Total issuances						$	1,000		$	650		$	225		$	2,222
	(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 9 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.
	(b)	Proceeds were used to repay $196 million of debt 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 13 for further details.
	(d)	Proceeds were used to fund a portion of Duke Energy's prior investment in the existing Wind Star renewables portfolio.
	(e)	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			September 30, 2014
	Unsecured Debt
	Duke Energy (Parent)	Apr-15		3.35	%		$	450
	First Mortgage Bonds
	Duke Energy Ohio	Mar-15		0.373	%		150
	Duke Energy Progress	Apr-15		5.15	%		300
	Other						256
	Current maturities of long-term debt						$	1,156
	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.
		September 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
	Commercial paper(b)	(1,278		)		(784		)	(300		)	(27		)	—			(4		)	(163		)
	Outstanding letters of credit	(64		)		(56		)	(4		)	(2		)	(1		)	—			(1		)
	Tax-exempt bonds	(116		)		—			(35		)	—			—			—			(81		)
	Available capacity	$	4,542			$	1,410		$	661		$	721		$	649		$	646		$	455
	(a)	Represents the sublimit of each borrower.
	(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 Payable to Affiliated Companies in Duke Energy Carolinas' and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.

Asset_Retirement_Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2014
Asset Retirement Obligations [Abstract]	'
Asset Retirement Obligations	'
	ASSET RETIREMENT OBLIGATIONS
	ASH BASINS
	As a result of the Coal Ash Act and the agreement with SCDHEC discussed in Note 5, Duke Energy Carolinas and Duke Energy Progress recorded asset retirement obligations (ARO) at September 30, 2014 of $2,026 million and $1,406 million, respectively, related to closure of ash basins in North Carolina and South Carolina. The amounts recorded assume ash will retain a non-hazardous designation by the EPA.
	The ARO amount is based upon estimated ash basin closure costs for each of Duke Energy's 32 ash basins located at 14 plants in North Carolina and an ash basin at a plant in South Carolina. The amount recorded represents the discounted cash flows for estimated closure costs of these ash basins based upon probability weightings of the potential closure methods as evaluated on a site by site basis. Actual costs to be incurred will be dependent upon factors that vary from site to site. The most significant factors are the method and timeframe of closure at the individual sites. Closure methods considered include removing the water from the basins and capping the ash with a synthetic barrier, excavating and relocating the ash to a lined structural fill or lined landfill, or recycling the ash for concrete or some other beneficial use. The ultimate method and timetable for closure will be in compliance with future standards set by the Coal Ash Management Commission established by the Coal Ash Act. The ARO amount will be adjusted as additional information is gained from the Coal Ash Management Commission on acceptable compliance approaches which may change management assumptions.
	Asset retirement costs associated with the asset retirement obligations for operating plants and retired plants have been included in Net property, plant and equipment, and Regulatory assets, respectively, on the Condensed Consolidated Balance Sheets. As of September 30, 2014, $1,559 million and $610 million were recorded in Net property, plant and equipment for Duke Energy Carolinas and Duke Energy Progress, respectively, and $467 million and $763 million were recorded in Regulatory assets for Duke Energy Carolinas and Duke Energy Progress, respectively. The asset retirement costs recorded for Duke Energy Progress are net of $33 million of Regulatory liabilities related to cost of removal. Cost recovery for these expenditures is believed to be probable and will be pursued through the normal ratemaking process with the NCUC, PSCSC, and FERC.
	The following table presents changes in the liability associated with asset retirement obligations for Duke Energy and the Subsidiary Registrants impacted by the Coal Ash Act and the agreement with SCDHEC.
	(in millions)	Duke Energy			Duke Energy Carolinas		Progress Energy			Duke Energy Progress
	Balance at December 31, 2013(a)(b)	$	4,958		$	1,594	$	2,570		$	1,737
	Accretion expense(c)	164			71		91			63
	Liabilities settled	(56		)	—		(52		)	—
	Liabilities incurred in the current year(d)	3,433			2,026		1,406			1,406
	Balance at September 30, 2014	$	8,499		$	3,691	$	4,015		$	3,206
	(a)	The balance as of December 31, 2013 primarily relates to decommissioning nuclear power facilities, asbestos removal and closure of landfills at fossil generation facilities.
	(b)	The balance at December 31, 2013 includes $8 million reported in Other current liabilities on the Condensed Consolidated Balance Sheets at Duke Energy, Progress Energy and Duke Energy Progress.
	(c)	Substantially all accretion expense for the nine months ended September 30, 2014 relates to Duke Energy's regulated electric operations from previously established asset retirement obligations and has been deferred in accordance with regulatory accounting treatment.
	(d)	Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.

Goodwill

Goodwill	9 Months Ended
	Sep. 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	—			(9		)	—			(9		)
	Balance at September 30, 2014
	Goodwill	15,950			317			935			17,202
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at September 30, 2014, as adjusted for accumulated impairment charges	$	15,950		$	317		$	64		$	16,331
	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 September 30, 2014
	Goodwill	1,136			1,188			2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at September 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.
	Impairment Testing
	Duke Energy, Duke Energy Ohio and Progress Energy are required to perform an annual goodwill impairment test as of the same date each year and, accordingly, performs its annual impairment testing of goodwill as of August 31. Duke Energy, Duke Energy Ohio and Progress Energy update their test between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. As the fair value of Duke Energy, Duke Energy Ohio and Progress Energy’s reporting units exceeded their respective carrying values at the date of the annual impairment analysis, no impairment charges were recorded in the third quarter of 2014.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 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 nine months ended September 30, 2014 and 2013 for the Subsidiary Registrants.
	See Note 13 for information relative to sale of receivables to an affiliate consolidated by Duke Energy.
	Because it is not a rated entity, Duke Energy Commercial Asset Management, Inc. (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 $550 million and $43 million, respectively, as of September 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	9 Months Ended
	Sep. 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 September 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.
		September 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)	29,569			—			—		—		—			25,680			607
	Natural gas (millions of decatherms)	659			—			319		117		202			340			—
		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.
		September 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 Variable Interest Entities (VIEs) of $552 million at September 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.
		September 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	—				14			—			18
	Deferred Credits and Other Liabilities: Other	—				23			—			4
	Total Derivatives Designated as Hedging Instruments	16				38			27			23
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	36				—			201			158
	Current Assets: Assets Held for Sale	2				2			—			—
	Investments and Other Assets: Other	9				—			215			131
	Investments and Other Assets: Assets Held for Sale	9				2			—			—
	Current Liabilities: Other	4				123			13			153
	Current Liabilities: Liabilities Associated with Assets Held for Sale	346				445			—			—
	Deferred Credits and Other Liabilities: Other	—				37			5			166
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	148				260			—			—
	Interest rate contracts
	Current Liabilities: Other	—				1			—			1
	Deferred Credits and Other Liabilities: Other	—				5			—			4
	Total Derivatives Not Designated as Hedging Instruments	554				875			434			613
	Total Derivatives	$	570			$	913		$	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.
		Derivative Assets
	30-Sep-14							31-Dec-13
(in millions)	Current(a)				Non-Current(b)			Current(e)			Non-Current(f)
Gross amounts recognized	$	388			$	175		$	214		$	233
Gross amounts offset	(362		)		(127		)	(179		)	(138		)
Net amount subject to master netting	26				48			35			95
Amounts not subject to master netting	—				7			—			14
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	26			$	55		$	35		$	109
	Derivative Liabilities
	30-Sep-14							31-Dec-13
(in millions)	Current(c)				Non-Current(d)			Current(g)			Non-Current(h)
Gross amounts recognized	$	583			$	314		$	322		$	299
Gross amounts offset	(402		)		(203		)	(192		)	(155		)
Net amounts subject to master netting	181				111			130			144
Amounts not subject to master netting	3				13			4			11
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	184			$	124		$	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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Pretax Gains (Losses) Recorded in AOCI
Interest rate contracts	$	(6	)		$	—		$	(15	)	$	71
Commodity contracts	—				—			—			1
Total Pretax Gains (Losses) Recorded in AOCI	$	(6	)		$	—		$	(15	)	$	72
Location of Pretax Gains (Losses) Reclassified from AOCI into Earnings
Interest rate contracts
Interest expense	(2		)		—			(7		)	(2		)
There was no hedge ineffectiveness during the three and nine months ended September 30, 2014 and 2013, and no gains or losses were excluded from the assessment of hedge effectiveness during the same periods.
A $9 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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Revenue: Regulated electric	$	—			$	3		$	—		$	10
Revenue: Nonregulated electric, natural gas and other	—				(7		)	—			(7		)
Fuel used in electric generation and purchased power - regulated	32				(68		)	18			(157		)
Fuel used in electric generation and purchased power - nonregulated	—				(2		)	—			—
Loss from Discontinued Operations	(319		)		—			(825		)	(28		)
Interest rate contracts
Interest expense	9				(4		)	—			(13		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(278	)		$	(78	)	$	(807	)	$	(195	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	3			$	(29	)	$	2		$	(34	)
Regulatory liabilities	1				6			—			10
Interest rate contracts
Regulatory assets	(7		)		12			9			51
Regulatory liabilities	(12		)		—			16			—
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(15	)		$	(11	)	$	27		$	27
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.
	September 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	—				—			3			2
Investments and Other Assets: Other	—				—			2			1
Current Liabilities: Other	1				115			11			105
Deferred Credits and Other Liabilities: Other	1				29			4			91
Total Derivatives Not Designated as Hedging Instruments	2				144			20			199
Total Derivatives	$	2			$	144		$	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.
	Derivative Assets
	30-Sep-14							31-Dec-13
(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
Gross amounts recognized	$	1			$	1		$	15		$	5
Gross amounts offset	(1		)		(1		)	(13		)	(4		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	2		$	1
	Derivative Liabilities
	30-Sep-14							31-Dec-13
(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
Gross amounts recognized	$	115			$	29		$	107		$	93
Gross amounts offset	(1		)		(1		)	(17		)	(10		)
Net amounts subject to master netting	114				28			90			83
Amounts not subject to master netting	—				—			—			4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	114			$	28		$	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.
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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Operating revenues	$	1			$	3		$	—		$	10
Fuel used in electric generation and purchased power	32				(68		)	18			(157		)
Interest rate contracts
Interest expense	—				(4		)	—			(13		)
Total Pretax Gains (Losses) Recognized in Earnings	$	33			$	(69	)	$	18		$	(160	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	3			$	(31	)	$	19		$	(34	)
Interest rate contracts
Regulatory assets	—				4			—			13
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	3			$	(27	)	$	19		$	(21	)
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.
	September 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
Investments and Other Assets: Other	—				—			2			1
Current Liabilities: Other	2				39			2			40
Deferred Credits and Other Liabilities: Other	1				8			2			29
Total Derivatives Not Designated as Hedging Instruments	3				47			6			70
Total Derivatives	$	3			$	48		$	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.
	Derivative Assets
	30-Sep-14							31-Dec-13
(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
Gross amounts recognized	$	2			$	1		$	3		$	3
Gross amounts offset	(2		)		(1		)	(3		)	(3		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	—		$	—
	Derivative Liabilities
	30-Sep-14							31-Dec-13
(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
Gross amounts recognized	$	40			$	8		$	41		$	30
Gross amounts offset	(2		)		(1		)	(3		)	(3		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	38			$	7		$	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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Operating revenues	$	1			$	3		$	—		$	10
Fuel used in electric generation and purchased power	13				(24		)	4			(53		)
Interest rate contracts
Interest expense	—				(3		)	—			(9		)
Total Pretax Gains (Losses) Recognized in Earnings	$	14			$	(24	)	$	4		$	(52	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	(19	)		$	(11	)	$	21		$	(18	)
Interest rate contracts
Regulatory assets	—				3			—			10
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(19	)		$	(8	)	$	21		$	(8	)
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.
	September 30, 2014							December 31, 2013
(in millions)	Asset				Liability			Asset			Liability
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	$	—			$	—		$	3		$	2
Current Liabilities: Other	1				75			9			64
Deferred Credits and Other Liabilities: Other	1				21			2			63
Total Derivatives	$	2			$	96		$	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.
	Derivative Assets
	30-Sep-14							31-Dec-13
(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
Gross amounts recognized	$	1			$	1		$	12		$	2
Gross amounts offset	(1		)		(1		)	(10		)	(2		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	2		$	—
	Derivative Liabilities
	30-Sep-14							31-Dec-13
(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
Gross amounts recognized	$	75			$	21		$	66		$	63
Gross amounts offset	(1		)		(1		)	(15		)	(7		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	74			$	20		$	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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Fuel used in electric generation and purchased power	20				(45		)	14			(105		)
Interest rate contracts
Interest expense	—				(1		)	—			(3		)
Total Pretax Gains (Losses) Recognized in Earnings	$	20			$	(46	)	$	14		$	(108	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	22			$	(19	)	$	(2	)	$	(16	)
Interest rate contracts
Regulatory assets	—				1			—			3
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	22			$	(18	)	$	(2	)	$	(13	)
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.
	September 30, 2014							December 31, 2013
(in millions)	Asset				Liability			Asset			Liability
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	$	2			$	—		$	186		$	163
Current Assets: Assets Held for Sale	1				1			—			—
Investments and Other Assets: Other	—				—			202			130
Investments and Other Assets: Assets Held for Sale	9				2			—			—
Current Liabilities: Other	—				—			1			36
Current Liabilities: Liabilities Associated with Assets Held for Sale	378				484			—			—
Deferred Credits and Other Liabilities: Other	—				—			2			56
Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	174				287			—			—
Interest rate contracts
Current Liabilities: Other	—				—			—			1
Deferred Credits and Other Liabilities: Other	—				4			—			4
Total Derivatives Designated as Hedging Instruments	564				778			391			390
Total Derivatives	$	564			$	778		$	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.
	Derivative Assets
	30-Sep-14							31-Dec-13
(in millions)	Current(a)				Non-Current(b)			Current(e)			Non-Current(f)
Gross amounts recognized	$	381			$	183		$	186		$	205
Gross amounts offset	(377		)		(177		)	(165		)	(132		)
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	4			$	6		$	21		$	73
	Derivative Liabilities
	30-Sep-14							31-Dec-13
(in millions)	Current(c)				Non-Current(d)			Current(g)			Non-Current(h)
Gross amounts recognized	$	485			$	293		$	199		$	186
Gross amounts offset	(419		)		(251		)	(173		)	(143		)
Net amounts subject to master netting	66				42			26			43
Amounts not subject to master netting	—				—			1			4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$	66			$	42		$	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 September 30,							Nine Months Ended September 30,
(in millions)	2014				2013			2014			2013
Location of Pretax Gains and (Losses) Recognized in Earnings
Commodity contracts
Income (Loss) from Discontinued Operations	$	(303	)		$	3		$	(887	)	$	(28	)
Interest rate contracts
Interest expense	—				—			(1		)	(1		)
Total Pretax Gains (Losses) Recognized in Earnings	$	(303	)		$	3		$	(888	)	$	(29	)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory assets	$	—			$	—		$	(1	)	$	—
Interest rate contracts
Regulatory assets	—				—			—			3
Regulatory liabilities	—				—			6			—
Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	—			$	—		$	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.
	September 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	$	688			$	107		$	38		$	69			$	688
Fair value of collateral already posted	202				—			—			—				202
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	86				107			38			69				86
	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, Duke Energy Progress and Duke Energy Indiana were not material.
	September 30, 2014				December 31, 2013
(in millions)	Receivables				Receivables
Duke Energy
Amounts offset against net derivative positions	$	116			$	30
Amounts not offset against net derivative positions	86				122
Progress Energy
Amounts offset against net derivative positions	—				10
Duke Energy Florida
Amounts offset against net derivative positions	—				10
Duke Energy Ohio
Amounts offset against net derivative positions	116				19
Amounts not offset against net derivative positions	86				115

Investments_in_Debt_and_Equity

Investments in Debt and Equity Securities	9 Months Ended
	Sep. 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 September 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 Nuclear Decommissioning Trust Fund (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 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 September 30, 2014 and December 31, 2013. There were no other-than-temporary impairments for debt or equity securities as of September 30, 2014 and December 31, 2013.
	DUKE ENERGY
	The following table presents the estimated fair value of investments in available-for-sale securities.
		September 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	$	—	$	—	$	74	$	—	$	—	$	110
	Equity securities	1,943		28		3,825		1,813		10		3,579
	Corporate debt securities	13		3		493		8		6		400
	Municipal bonds	5		1		132		2		6		160
	U.S. government bonds	12		4		713		7		12		730
	Other debt securities	—		1		137		22		2		154
	Total NDTF	$	1,973	$	37	$	5,374	$	1,852	$	36	$	5,133
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	21
	Equity securities	32		—		95		29		—		91
	Corporate debt securities	2		—		68		1		1		99
	Municipal bonds	3		—		82		2		2		79
	U.S. government bonds	—		—		16		—		—		17
	Other debt securities	1		5		96		—		8		111
	Total Other Investments(a)	$	38	$	5	$	373	$	32	$	11	$	418
	Total Investments	$	2,011	$	42	$	5,747	$	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)	September 30, 2014
	Due in one year or less	$	33
	Due after one through five years	452
	Due after five through 10 years	457
	Due after 10 years	795
	Total	$	1,737
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	28	$	72	$	90	$	135
	Realized losses	51		16		57		38
	DUKE ENERGY CAROLINAS
	The following table presents the estimated fair value of investments in available-for-sale securities.
		September 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	$	—	$	—	$	39	$	—	$	—	$	42
	Equity securities	1,046		17		2,124		974		6		1,964
	Corporate debt securities	7		3		345		5		5		274
	Municipal bonds	1		—		22		—		2		54
	U.S. government bonds	4		2		317		3		7		354
	Other debt securities	—		1		122		22		2		146
	Total NDTF	$	1,058	$	23	$	2,969	$	1,004	$	22	$	2,834
	Other Investments
	Other debt securities	$	—	$	1	$	3	$	—	$	1	$	3
Total Other Investments(a)	$	—	$	1	$	3	$	—	$	1	$	3
Total Investments	$	1,058	$	24	$	2,972	$	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)	September 30, 2014
Due in one year or less	$	2
Due after one through five years	171
Due after five through 10 years	256
Due after 10 years	380
Total	$	809
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 September 30,				Nine Months Ended September 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	20	$	49	$	72	$	95
Realized losses	48		1		50		11
PROGRESS ENERGY
The following table presents the estimated fair value investments in available-for-sale securities.
	September 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	$	—	$	—	$	35	$	—	$	—	$	68
Equity securities	897		11		1,701		839		4		1,615
Corporate debt securities	6		—		148		3		1		126
Municipal bonds	4		1		110		2		4		106
U.S. government bonds	8		2		396		4		5		376
Other debt securities	—		—		15		—		—		8
Total NDTF	$	915	$	14	$	2,405	$	848	$	14	$	2,299
Other Investments
Cash and cash equivalents	$	—	$	—	$	15	$	—	$	—	$	20
Municipal bonds	3		—		43		1		—		39
Total Other Investments(a)	$	3	$	—	$	58	$	1	$	—	$	59
Total Investments	$	918	$	14	$	2,463	$	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)	September 30, 2014
Due in one year or less	$	21
Due after one through five years	218
Due after five through 10 years	145
Due after 10 years	328
Total	$	712
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 September 30,				Nine Months Ended September 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	8	$	22	$	17	$	37
Realized losses	3		11		6		20
DUKE ENERGY PROGRESS
The following table presents the estimated fair value of investments in available-for-sale securities.
	September 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	$	—	$	—	$	28	$	—	$	—	$	48
Equity securities	574		7		1,127		535		3		1,069
Corporate debt securities	4		—		95		3		1		80
Municipal bonds	4		1		108		2		4		104
U.S. government bonds	6		2		257		4		3		232
Other debt securities	—		—		8		—		—		5
Total NDTF	$	588	$	10	$	1,623	$	544	$	11	$	1,538
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	2
Total Other Investments(a)	$	—	$	—	$	2	$	—	$	—	$	2
Total Investments	$	588	$	10	$	1,625	$	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)	September 30, 2014
Due in one year or less	$	10
Due after one through five years	147
Due after five through 10 years	94
Due after 10 years	217
Total	$	468
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 September 30,				Nine Months Ended September 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	4	$	7	$	11	$	15
Realized losses	2		2		4		6
DUKE ENERGY FLORIDA
The following table presents the estimated fair value of investments in available-for-sale securities.
	September 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	$	—	$	—	$	7	$	—	$	—	$	20
Equity securities	323		4		574		304		1		546
Corporate debt securities	2		—		53		—		—		46
Municipal bonds	—		—		2		—		—		2
U.S. government bonds	2		—		139		—		2		144
Other debt securities	—		—		7		—		—		3
Total NDTF	$	327	$	4	$	782	$	304	$	3	$	761
Other Investments
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	—	$	3
Municipal bonds	3		—		43		1		—		39
Total Other Investments(a)	$	3	$	—	$	43	$	1	$	—	$	42
Total Investments	$	330	$	4	$	825	$	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)	September 30, 2014
Due in one year or less	$	11
Due after one through five years	71
Due after five through 10 years	51
Due after 10 years	111
Total	$	244
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 September 30,				Nine Months Ended September 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	3	$	14	$	5	$	22
Realized losses	1		9		2		13
DUKE ENERGY INDIANA
The following table presents the estimated fair value of investments in available-for-sale securities.
	September 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	26		—		68		24		—		65
Municipal bonds	—		—		30		—		1		28
Total Other Investments(a)	$	26	$	—	$	99	$	24	$	1	$	94
Total Investments	$	26	$	—	$	99	$	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)	September 30, 2014
Due in one year or less	$	1
Due after one through five years	18
Due after five through 10 years	8
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 nine months ended September 30, 2014 and 2013.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 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 nine months ended September 30, 2014 and 2013. Transfers out of Level 3 during the three and nine months ended September 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, Long-lived Assets and Assets Held for Sale
	See Note 8 for a discussion of the valuation of goodwill and long-lived assets and Note 2 related to the Midwest Generation Disposal Group.
	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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,824			$	3,649			$	3			$	172
	Nuclear decommissioning trust fund debt securities	1,550				388				1,162				—
	Other trading and available-for-sale equity securities	96				96				—				—
	Other trading and available-for-sale debt securities	284				31				238				15
	Derivative assets	85				6				45				34
	Total assets	5,839				4,170				1,448				221
	Derivative liabilities	(428		)		(119		)		(253		)		(56		)
	Net assets	$	5,411			$	4,051			$	1,195			$	165
		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 September 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	188			$	22			$	210
	Total pretax realized or unrealized gains (losses) included in earnings	—				(33		)		(33		)
	Purchases, sales, issuances and settlements:
	Purchases	13				(1		)		12
	Sales	(13		)		—				(13		)
	Issuances	—				1				1
	Transfers out of Level 3 due to observability of inputs	—				(1		)		(1		)
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4				(10		)		(6		)
	Balance at end of period	$	192			$	(22	)		$	170
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(49	)		$	(49	)
		Three Months Ended September 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	97			$	(87	)		$	10
	Total pretax realized or unrealized gains (losses) included in earnings	—				13				13
	Total pretax gains included in other comprehensive income	1				—				1
	Purchases, sales, issuances and settlements:
	Purchases	2				—				2
	Sales	(2		)		—				(2		)
Issuances	—				4				4
Settlements	(2		)		(3		)		(5		)
Transfers out of Level 3 due to observability of inputs	—				34				34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				1				2
Balance at end of period	$	97			$	(38	)		$	59
	Nine Months Ended September 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	—				(21		)		(21		)
Purchases, sales, issuances and settlements:
Purchases	29				50				79
Sales	(15		)		—				(15		)
Settlements	—				(45		)		(45		)
Transfers out of Level 3 due to observability of inputs	68				(4		)		64
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	12				(15		)		(3		)
Balance at end of period	$	192			$	(22	)		$	170
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(49	)		$	(49	)
	Nine Months Ended September 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	—				(8		)		(8		)
Total pretax gains included in other comprehensive income	(1		)		—				(1		)
Purchases, sales, issuances and settlements:
Purchases	5				21				26
Sales	(5		)		—				(5		)
Issuances	—				9				9
Settlements	(3		)		(5		)		(8		)
Transfers out of Level 3 due to observability of inputs	—				34				34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	3				(4		)		(1		)
Balance at end of period	$	97			$	(38	)		$	59
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 10. See Note 11 for additional information related to investments by major security type.
	September 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	2,124			$	1,949			$	3			$	172
Nuclear decommissioning trust fund debt securities	845				150				695				—
Other trading and available-for-sale debt securities	3				—				—				3
Net assets	$	2,972			$	2,099			$	698			$	175
	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 September 30, 2014
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	171			$	(3	)		$	168
Purchases, sales, issuances and settlements:
Purchases	13				—				13
Sales	(13		)		—				(13		)
Settlements	—				3				3
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4				—				4
Balance at end of period	$	175			$	—			$	175
	Three Months Ended September 30, 2013
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	74			$	(4	)		$	70
Purchases, sales, issuances and settlements:
Purchases	2				—				2
Sales	(2		)		—				(2		)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				—				1
Balance at end of period	$	75			$	(4	)		$	71
	Nine Months Ended September 30, 2014
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	81			$	(2	)		$	79
Purchases, sales, issuances and settlements:
Purchases	29				—				29
Sales	(15		)		—				(15		)
Settlements	—				2				2
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	12				—				12
Balance at end of period	$	175			$	—			$	175
	Nine Months Ended September 30, 2013
(in millions)	Investments				Derivatives (net)				Total
Balance at beginning of period	$	72			$	(12	)		$	60
Purchases, sales, issuances and settlements:
Purchases	5				—				5
Sales	(5		)		—				(5		)
Settlements	—				8				8
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	3				—				3
Balance at end of period	$	75			$	(4	)		$	71
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 10. See Note 11 for additional information related to investments by major security type.
	September 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,700			$	1,700			$	—			$	—
Nuclear decommissioning trust fund debt securities	705				238				467				—
Other trading and available-for-sale debt securities	58				15				43				—
Total assets	2,463				1,953				510				—
Derivative liabilities	(142		)		—				(142		)		—
Net assets	$	2,321			$	1,953			$	368			$	—
	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 September 30,								Nine Months Ended September 30,
(in millions)	2014				2013				2014				2013
Balance at beginning of period	$	—			$	(35	)		$	—			$	(38	)
Purchases, sales, issuances and settlements:
Issuances	—				2				—				10
Transfers out of Level 3 due to observability of inputs	2				34				—				34
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(2		)		(1		)		—				(6		)
Balance at end of period	$	—			$	—			$	—			$	—
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 10. See Note 11 for additional information related to investments by major security type.
	September 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	1,126			$	1,126			$	—			$	—
Nuclear decommissioning trust fund debt securities	497				155				342				—
Other trading and available-for-sale debt securities	2				2				—				—
Total assets	1,625				1,283				342				—
Derivative liabilities	(45		)		—				(45		)		—
Net assets	$	1,580			$	1,283			$	297			$	—
	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 September 30,								Nine Months Ended September 30,
(in millions)	2014				2013				2014				2013
Balance at beginning of period	$	—			$	(35	)		$	—			$	(38	)
Purchases, sales, issuances and settlements:
Issuances	—				—				—				9
Settlements	—				2				—				—
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—				(1		)		—				(5		)
Transfers out of Level 3 due to observability of inputs	—				34				—				34
Balance at end of period	$	—			$	—			$	—			$	—
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 10. See Note 11 for additional information related to investments by major security type.
	September 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Nuclear decommissioning trust fund equity securities	$	574			$	574			$	—			$	—
Nuclear decommissioning trust fund debt securities and other	208				83				125				—
Other trading and available-for-sale debt securities and other	43				—				43				—
Derivative assets	3				—				3				—
Total assets	828				657				171				—
Derivative liabilities	(97		)		—				(97		)		—
Net assets	$	731			$	657			$	74			$	—
	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 10.
	September 30, 2014
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Derivative assets	$	7			$	—			$	3			$	4
Derivative liabilities	(221		)		(114		)		(48		)		(59		)
Net assets (liabilities)	$	(214	)		$	(114	)		$	(45	)		$	(55	)
	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 September 30,								Nine Months Ended September 30,
(in millions)	2014				2013				2014				2013
Balance at beginning of period	$	(28	)		$	(19	)		$	(4	)		$	(6	)
Total pretax realized or unrealized gains (losses) included in earnings	(24		)		11				(43		)		(4		)
Purchases, sales, issuances and settlements:
Purchases	—				—				1				1
Settlements	(2		)		2				(6		)		—
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(1		)		—				1				3
Transfers out of Level 3 due to observability of inputs	—				—				(4		)		—
Balance at end of period	$	(55	)		$	(6	)		$	(55	)		$	(6	)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at June 30, 2014									$	(52	)
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 10. See Note 11 for additional information related to investments by major security type.
	30-Sep-14
(in millions)	Total Fair Value				Level 1				Level 2				Level 3
Available-for-sale equity securities	$	69			$	69			$	—			$	—
Available-for-sale debt securities	30				—				30				—
Derivative assets	23				1				—				22
Net assets	$	122			$	70			$	30			$	22
	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 September 30,								Nine Months Ended September 30,
(in millions)	2014				2013				2014				2013
Balance at beginning of period	$	45			$	18			$	12			$	10
Total pretax realized or unrealized gains (losses) included in earnings	(13		)		3				14				5
Purchases, sales, issuances and settlements:
Purchases	—				—				49				20
Settlements	—				(10		)		(38		)		(23		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(10		)		3				(15		)		2
Balance at end of period	$	22			$	14			$	22			$	14
QUANTITATIVE DISCLOSURES ABOUT UNOBSERVABLE INPUTS
The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
	30-Sep-14
Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
	(in millions)
Duke Energy
Natural gas contracts	$	(33	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	2.45		-	$	4.66
Financial transmission rights (FTRs)	22			RTO auction pricing	FTR price - per MWh	(2.47		)	-	12.92
Electricity contracts	(2		)	Discounted cash flow	Forward electricity curves - price per MWh	25.18			-	59.17
Commodity capacity option contracts	5			Discounted cash flow	Forward capacity option curves - price per MW day	28.6			-	189.25
Reserves	(14		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(22	)
Duke Energy Ohio
Electricity contracts	$	(10	)	Discounted cash flow	Forward electricity curves - price per MWh	25.35			-	59.6
Natural gas contracts	(33		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	2.45			-	4.66
Reserves	(12		)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(55	)
Duke Energy Indiana
FTRs	$	22		RTO auction pricing	FTR price - per MWh	(2.47		)	-	12.92
	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.
	September 30, 2014							December 31, 2013
(in millions)	Book Value			Fair Value				Book Value			Fair Value
Duke Energy	$	39,858		$	43,602			$	40,256		$	42,592
Duke Energy Carolinas	8,394			9,426				8,436			9,123
Progress Energy	14,512			16,305				14,115			15,234
Duke Energy Progress	5,716			6,013				5,235			5,323
Duke Energy Florida	5,102			5,867				4,886			5,408
Duke Energy Ohio	1,783			1,967				2,188			2,237
Duke Energy Indiana	3,795			4,356				3,796			4,171
At both September 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	9 Months Ended
	Sep. 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 nine months ended September 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 tables below show VIEs consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		September 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)	$	695		$	474			$	403		$	465		$	12		$	20		$	2,069
	Other	—			—				—			—			141			13			154
	Investments and Other Assets
	Other	—			—				—			—			29			34			63
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—			—				—			—			1,856			18			1,874
	Accumulated depreciation and amortization	—			—				—			—			(232		)	(5		)	(237		)
	Regulatory Assets and Deferred Debits
	Other	1			—				1			—			35			—			37
	Total assets	$	696		$	474			$	404		$	465		$	1,841		$	80		$	3,960
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—		$	—			$	—		$	—		$	2		$	—		$	2
	Taxes accrued	—			—				—			—			6			—			6
	Current maturities of long-term debt	—			—				—			—			67			16			83
	Other	—			—				—			—			26			12			38
	Long-Term Debt(b)	400			300				225			325			989			21			2,260
	Deferred Credits and Other Liabilities
	Deferred income taxes	—			—				—			—			292			—			292
	Asset retirement obligations	—			—				—			—			31			—			31
	Other	—			—				—			—			33			10			43
	Total liabilities	$	400		$	300			$	225		$	325		$	1,446		$	59		$	2,755
	Net assets of consolidated variable interest entities	$	296		$	174			$	179		$	140		$	395		$	21		$	1,205
	(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 / DEPR / DEFR
Duke Energy Receivables Finance Company, LLC (DERF), Duke Energy Progress Receivables Company, LLC (DEPR), and Duke Energy Florida Receivables Company, LLC (DEFR) are bankruptcy remote, special purpose subsidiaries of Duke Energy Carolinas, Duke Energy Progress, and Duke Energy Florida, respectively. On a daily basis, DERF, DEPR, and DEFR buy certain accounts receivable arising from the sale of electricity and/or related services from Duke Energy Carolinas, Duke Energy Progress, and Duke Energy Florida. DERF, DEPR, and DEFR are wholly owned limited liability companies with separate legal existence from their parents, and their assets are not generally available to creditors of Duke Energy Carolinas, Duke Energy Progress, and Duke Energy Florida. DERF, DEPR, and DEFR borrow amounts under credit facilities to buy the receivables. Borrowings are limited to the amount of qualified receivables sold, which is expected to be in excess of the credit facilities. The credit facilities are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. The secured credit facilities were 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, DEPR, and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress, and Duke Energy Florida consolidate DERF, DEPR, and DEFR, respectively, as they make those decisions.
The following table outlines amounts and expiration dates of the credit facilities.
	DERF		DEPR			DEFR
Credit facility amount (in millions)	$	400	$	300		$	225
Expiration date	Oct-16		Dec-16			Mar-17
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 nine months ended September 30, 2014 and 2013, respectively. 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 November 2016 and 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-Sep-14
	Duke Energy										Duke Energy			Duke Energy
(in millions)	Renewables			Other				Total			Ohio			Indiana
Receivables	$	—		$	—			$	—		$	49		$	76
Investments in equity method unconsolidated affiliates	149			3				152			—			$	—
Investments and other assets	—			4				4			—			—
Total assets	$	149		$	7			$	156		$	49		$	76
Other current liabilities	$	—		$	2			$	2		$	—		$	—
Deferred credits and other liabilities	—			14				14			—			—
Total liabilities	$	—		$	16			$	16		$	—		$	—
Net assets (liabilities)	$	149		$	(9	)		$	140		$	49		$	76
	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 (See Note 5), 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 carrying amount of OVEC, including this intangible asset, was fully impaired at September 30, 2014.
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)	September 30, 2014			December 31, 2013				September 30, 2014			December 31, 2013
Receivables sold	$	216		$	290			$	287		$	340
Less: Retained interests	49			114				76			143
Net receivables sold	$	167		$	176			$	211		$	197
The following table shows sales and cash flows related to receivables sold.
	Duke Energy Ohio													Duke Energy Indiana
	Three Months Ended September 30,							Nine Months Ended September 30,						Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2014			2013				2014			2013			2014			2013			2014			2013
Sales
Receivables sold	$	477		$	514			$	1,705		$	1,664		$	739		$	765		$	2,173		$	2,214
Loss recognized on sale	3			3				9			9			3			2			8			8
Cash flows
Cash proceeds from receivables sold	494			518				1,761			1,674			759			758			2,233			2,204
Collection fees received	—			—				1			1			—			—			1			1
Return received on retained interests	—			1				3			4			2			2			5			5
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 London Interbank Offered Rate (LIBOR) plus a fixed rate of 1.00 percent.

Common_Stock

Common Stock	9 Months Ended
	Sep. 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.
		Three Months Ended September 30,				Nine Months Ended September 30,
	(in millions, except per share amounts)	2014		2013		2014		2013
	Income from continuing operations attributable to Duke Energy common shareholders	$	887	$	942	$	2,351	$	1,884
	Weighted-average shares outstanding - basic	707		706		707		706
	Weighted-average shares outstanding - diluted	707		706		707		706
	Earnings per share from continuing operations attributable to Duke Energy common shareholders
	Basic	$	1.25	$	1.33	$	3.33	$	2.67
	Diluted	$	1.25	$	1.33	$	3.33	$	2.67
	Potentially dilutive items excluded from the calculation(a)					2		2
	Dividends declared per common share	$	0.795	$	0.78	$	2.355	$	2.31
	(a)	Stock options and performance and unvested stock awards were not included in the dilutive securities calculation 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.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Stock options	—		$	—	—		$	2
	Restricted stock unit awards	8		10		30		36
	Performance awards	4		7		14		25
	Total	$	12	$	17	$	44	$	63
	Tax benefit associated with stock-based compensation expense	$	5	$	6	17		$	24
	Stock-based compensation costs capitalized	1		1		3		3

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 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 made contributions directly to pension plan assets during the three and nine months ended September 30, 2013 of $27 million, all of which relates to Duke Energy Florida. Duke Energy did not make any contributions to its qualified defined benefit retirement plans during the nine months ended September 30, 2014.
	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 9.
	QUALIFIED PENSION PLANS
	The following tables include the components of net periodic pension costs for qualified pension plans.
		Three Months Ended September 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		$	10		$	10		$	6		$	5		$	1		$	3
	Interest cost on projected benefit obligation	86			22			28			13			14			5			7
	Expected return on plan assets	(128		)	(33		)	(44		)	(21		)	(21		)	(7		)	(10		)
	Amortization of actuarial loss	37			8			17			8			8			1			3
	Amortization of prior service credit	(4		)	(2		)	—			—			—			—			—
	Other	3			1			1			—			—			—			—
	Net periodic pension costs	$	28		$	6		$	12		$	6		$	6		$	—		$	3
		Three Months Ended September 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	$	41		$	12		$	15		$	6		$	8		$	1		$	2
	Interest cost on projected benefit obligation	80			20			29			13			13			5			7
	Expected return on plan assets	(137		)	(37		)	(50		)	(24		)	(21		)	(7		)	(11		)
	Amortization of actuarial loss	61			15			26			11			12			3			6
	Amortization of prior service credit	(2		)	(2		)	(1		)	(1		)	(1		)	—			—
	Other	2			1			—			1			—			—			1
	Net periodic pension costs	$	45		$	9		$	19		$	6		$	11		$	2		$	5
		Nine Months Ended September 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	$	102		$	31		$	30		$	16		$	15		$	3		$	7
	Interest cost on projected benefit obligation	258			64			84			40			43			15			22
	Expected return on plan assets	(383		)	(99		)	(130		)	(64		)	(64		)	(20		)	(30		)
	Amortization of actuarial loss	111			26			51			24			24			3			9
	Amortization of prior service credit	(11		)	(6		)	(2		)	(1		)	(1		)	—			—
	Other	6			2			2			1			1			—			—
	Net periodic pension costs	$	83		$	18		$	35		$	16		$	18		$	1		$	8
		Nine Months Ended September 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	$	125		$	37		$	45		$	17		$	23		$	4		$	8
	Interest cost on projected benefit obligation	240			60			87			38			40			16			21
	Expected return on plan assets	(411		)	(111		)	(149		)	(71		)	(65		)	(22		)	(33		)
	Amortization of actuarial loss	183			45			76			34			37			9			17
	Amortization of prior service credit	(8		)	(5		)	(3		)	(1		)	(2		)	—			—
	Other	5			2			1			1			—			—			1
	Net periodic pension costs	$	134		$	28		$	57		$	18		$	33		$	7		$	14
	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 September 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			2			—			—
	Amortization of actuarial loss	1			—			—			—			—
	Amortization of prior service credit	—			—			(1		)	—			—
	Net periodic pension costs	$	5		$	1		$	1		$	1		$	—
		Three Months Ended September 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	1		$	—
	Interest cost on projected benefit obligation	3			—			1			—			—
	Amortization of actuarial loss	1			—			1			1			1
	Net periodic pension costs	$	5		$	—		$	3		$	2		$	1
		Nine Months Ended September 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	2		$	—		$	1		$	1		$	—
	Interest cost on projected benefit obligation	10			1			4			1			1
Amortization of actuarial loss	2			—			1			—			—
Amortization of prior service credit	—			—			(1		)	—			—
Net periodic pension costs	$	14		$	1		$	5		$	2		$	1
	Nine Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
Service cost	$	2		$	—		$	1		$	1		$	—
Interest cost on projected benefit obligation	10			1			5			1			1
Amortization of actuarial loss	4			—			3			1			1
Amortization of prior service credit	(1		)	—			(1		)	—			—
Net periodic pension costs	$	15		$	1		$	8		$	3		$	2
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 uses a December 31 measurement date for its other post-retirement benefit plan assets and obligations. However, due to the impact of certain changes in Legacy Progress Energy health care benefits announced in September 2013, Duke Energy remeasured its Legacy Progress Energy other post-retirement benefit plan obligation as of September 30, 2013. There are no plan assets associated with the Legacy Progress Energy other post-retirement benefit plan. The discount rate used for the remeasurement was 4.7%. The health care cost trend rate of 8.5% reduces to 5.0% over eight years. The mortality tables were updated to account for mortality improvement.
Duke Energy did not make any contributions to its other post-retirement benefit plans during the three and nine months ended September 30, 2014 and 2013.
The following tables include the components of net periodic other post-retirement benefit costs.
	Three Months Ended September 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Indiana
Service cost	$	2		$	—		$	1		$	—		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	13			3			6			3			3			1
Expected return on plan assets	(3		)	(2		)	—			—			—			—
Amortization of actuarial loss	9			1			10			8			3			—
Amortization of prior service credit	(31		)	(3		)	(24		)	(19		)	(5		)	—
Net periodic other post-retirement benefit costs	$	(10	)	$	(1	)	$	(7	)	$	(8	)	$	1		$	1
	Three Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Indiana
Service cost	$	7		$	1		$	6		$	3		$	2		$	1
Interest cost on accumulated post-retirement benefit obligation	19			3			12			7			5			1
Expected return on plan assets	(4		)	(2		)	—			—			—			(1		)
Amortization of actuarial loss	13			—			13			8			4			1
Amortization of prior service credit	(3		)	(2		)	—			—			—			—
Net periodic other post-retirement benefit costs	$	32		$	—		$	31		$	18		$	11		$	2
	Nine Months Ended September 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	$	7		$	1		$	3		$	1		$	2		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	38			9			17			8			9			1			4
Expected return on plan assets	(9		)	(6		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	29			2			31			23			8			(1		)	—
Amortization of prior service credit	(94		)	(8		)	(71		)	(55		)	(16		)	—			—
Net periodic other post-retirement benefit costs	$	(29	)	$	(2	)	$	(20	)	$	(23	)	$	3		$	—		$	3
	Nine Months Ended September 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	$	21		$	2		$	17		$	9		$	6		$	—		$	1
Interest cost on accumulated post-retirement benefit obligation	55			9			35			19			13			1			4
Expected return on plan assets	(11		)	(7		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	39			2			42			26			12			(1		)	1
Amortization of prior service credit	(9		)	(6		)	(1		)	(1		)	—			—			—
Net periodic other post-retirement benefit costs	$	95		$	—		$	93		$	53		$	31		$	—		$	5
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 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 September 30,
2014(a)	$	30		$	10		$	10		$	7		$	3		$	—		$	1
2013	30			10			12			7			4			—			2
Nine Months Ended September 30,
2014(a)	$	110		$	36		$	33		$	23		$	10		$	2		$	5
2013	101			34			34			19			11			2			5
(a)	For the three and nine months ended September 30, 2014, amounts include the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	The effective tax rates from continuing operations for each of the Duke Energy Registrants are included in the following table.
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Duke Energy	34	%	30.9	%	31.4	%	32.3	%
	Duke Energy Carolinas	33.9	%	37.9	%	33.7	%	37.5	%
	Progress Energy	37.1	%	38.8	%	37.3	%	38.1	%
	Duke Energy Progress	36.3	%	35.7	%	36.6	%	37.3	%
	Duke Energy Florida	38.5	%	40	%	38.6	%	40	%
	Duke Energy Ohio	38.3	%	35.9	%	34.9	%	36.5	%
	Duke Energy Indiana	31.6	%	36.6	%	35.2	%	37.2	%
	The increase in the effective tax rate for Duke Energy for the three months ended September 30, 2014 is primarily due to a favorable deferred state tax adjustment in the third quarter of 2013.
	The decrease in the effective tax rate for Duke Energy Carolinas for the three months ended September 30, 2014 is primarily due to an increase in the tax benefit related to the manufacturing deduction in 2014 as the prior year deduction was limited by taxable income. The decrease in the effective tax rate for Duke Energy Carolinas for the nine months ended September 30, 2014 is primarily due to favorable audit settlements, changes in apportionment related to state income tax, and the tax benefit related to the manufacturing deduction in 2014 as the prior year deduction was limited by taxable income.
	The decrease in the effective tax rate for Progress Energy for the three months ended September 30, 2014 is primarily due to certain nondeductible book depreciation.
	The decrease in the effective tax rate for Duke Energy Florida for the three and nine months ended September 30, 2014 is primarily due to certain nondeductible book depreciation.
	The increase in the effective tax rate for Duke Energy Ohio for the three months ended September 30, 2014 is primarily due to an increase in the tax benefit related to the manufacturing deduction. The decrease in the effective tax rate for Duke Energy Ohio for the nine months ended September 30, 2014 is primarily due to certain nondeductible book depreciation.
	The decrease in the effective tax rate for Duke Energy Indiana for the three and nine months ended September 30, 2014 is primarily due to a reduction in the statutory Indiana corporate income tax rate and a prior period audit settlement.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	For information on subsequent events related to acquisitions and dispositions, regulatory matters, commitments and contingencies, and debt and credit facilities see Notes 2, 4, 5, and 6, respectively.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policy)	9 Months Ended
	Sep. 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 (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 regulated public utility primarily engaged in the generation, transmission and distribution of electricity and the transportation and sale of natural gas 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 conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers. 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 has agreed to sell Duke Energy Ohio's nonregulated Midwest generation business, which sells power into wholesale energy markets, to Dynegy Inc. (Dynegy). See Note 2 for additional information.
	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 FERC. Substantially all of Duke Energy Indiana’s operations qualify for regulatory accounting.
Basis of Accounting	'
	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.
	On August 21, 2014, Duke Energy Commercial Enterprises, Inc., an indirect wholly owned subsidiary of Duke Energy Corporation, and Duke Energy SAM, LLC, a wholly owned subsidiary of Duke Energy Ohio, entered into a purchase and sale agreement (PSA) with a subsidiary of Dynegy whereby Dynegy will acquire Duke Energy Ohio’s nonregulated Midwest generation business (Disposal Group). The results of operations of the nonregulated Midwest generation business have been classified as Discontinued Operations on the Condensed Consolidated Statements of Operations for the current and prior periods presented. Duke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. See Note 2 for additional information.
	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.
Use of Estimates	'
	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 13 for further information.
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 13 for further information.

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2014
Organization And Basis Of Presentation [Line Items]	'
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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014				2013
	Duke Energy	$	101			$	168		$	416			$	457
	Duke Energy Carolinas	4				46			93				124
	Progress Energy	63				89			214				230
	Duke Energy Progress	—				33			56				88
	Duke Energy Florida	63				56			158				142
	Duke Energy Ohio	24				24			80				77
	Duke Energy Indiana	10				9			29				26
Amounts Attributable to Controlling Interests	'
	The following table presents Net Income Attributable to Duke Energy Corporation for continuing operations and discontinued operations for the three and nine months ended September 30, 2014 and 2013.
		Three Months Ended September 30,
		2014						2013
	(in millions)	Duke Energy			Progress Energy			Duke Energy			Progress Energy
	Income from Continuing Operations	$	891		$	330		$	946		$	328
	Income of Continuing Operations Attributable to Noncontrolling Interests	3			1			4			1
	Income from Continuing Operations Attributable to Duke Energy Corporation	$	888		$	329		$	942		$	327
	Income From Discontinued Operations, net of tax	$	378		$	—		$	62		$	14
	Loss of Discontinued Operations attributable to Noncontrolling Interests, net of tax	(8		)	—			—			—
	Discontinued Operations Attributable to Duke Energy Corporation, net of tax	$	386		$	—		$	62		$	14
	Net income	$	1,269		$	330		$	1,008		$	342
	Net (Loss) Income Attributable to Noncontrolling Interest	(5		)	1			4			1
	Net Income Attributable to Duke Energy Corporation	$	1,274		$	329		$	1,004		$	341
		Nine Months Ended September 30,
		2014						2013
	(in millions)	Duke Energy			Progress Energy			Duke Energy			Progress Energy
	Income from Continuing Operations	$	2,367		$	741		$	1,902		$	469
	(Loss) Income of Continuing Operations Attributable to Noncontrolling Interests	11			2			12			2
	Income from Continuing Operations Attributable to Duke Energy Corporation	$	2,356		$	739		$	1,890		$	467
	(Loss) Income From Discontinued Operations, net of tax	$	(578	)	$	(6	)	$	82		$	10
	Income (Loss) of Discontinued Operations attributable to Noncontrolling Interests, net of tax	(8		)	—			(5		)	—
	Discontinued Operations Attributable to Duke Energy Corporation, net of tax	$	(570	)	$	(6	)	$	87		$	10
	Net income	$	1,789		$	735		$	1,984		$	479
	Net Income Attributable to Noncontrolling Interest	3			2			7			2
	Net Income Attributable to Duke Energy Corporation	$	1,786		$	733		$	1,977		$	477
Unbilled Revenues [Member]	'
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. This table excludes amounts included in assets held for sale (AHFS).
	(in millions)	September 30, 2014				December 31, 2013
	Duke Energy	$	798			$	937
	Duke Energy Carolinas	285				323
	Progress Energy	232				189
	Duke Energy Progress	131				120
	Duke Energy Florida	101				69
	Duke Energy Ohio	—				55
	Duke Energy Indiana	26				5
Duke Energy Ohio [Member] | Unbilled Revenues [Member]	'
Organization And Basis Of Presentation [Line Items]	'
Schedule Of Unbilled Revenues With Restricted Receivables	'
	These receivables for unbilled revenues are shown in the table below.
	(in millions)	September 30, 2014				December 31, 2013
	Duke Energy Ohio	$	54			$	89
	Duke Energy Indiana	94				144
Duke Energy Indiana [Member] | Unbilled Revenues [Member]	'
Organization And Basis Of Presentation [Line Items]	'
Schedule Of Unbilled Revenues With Restricted Receivables	'
	These receivables for unbilled revenues are shown in the table below.
	(in millions)	September 30, 2014				December 31, 2013
	Duke Energy Ohio	$	54			$	89
	Duke Energy Indiana	94				144

Acquisitions_and_Dispositions_

Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Generation Facilities of Disposal Group	'
	The Disposal Group was 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.
Income Statement Disclosures	'
	Results of discontinued operations were as follows.
	Duke Energy
		Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013			2014			2013
	Operating Revenues	$	620		$	491		$	1,233		$	1,369
	Estimated gain (loss) on disposition	460			—			(847		)	—
	Income (loss) before income taxes	$	623		$	82		$	(864	)	$	126
	Income tax expense (benefit)	218			34			(321		)	43
	Income (loss) from discontinued operations of the Disposal Group	405			48			(543		)	83
	Other, net of tax(a)	(27		)	14			(35		)	(1		)
	Income (Loss) from Discontinued Operations, net of tax	$	378		$	62		$	(578	)	$	82
	(a)	Other discontinued operations relates to prior sales of businesses and includes indemnifications provided for certain legal, tax and environmental matters, and foreign currency translation adjustments.
	Duke Energy Ohio
		Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013			2014			2013
	Operating Revenues	$	536		$	389		$	853		$	1,054
	Estimated gain (loss) on disposition	466			—			(878		)	—
	Income (loss) before income taxes	$	647		$	65		$	(917	)	$	71
	Income tax expense (benefit)	234			30			(320		)	32
	Income (Loss) from Discontinued Operations, net of tax	$	413		$	35		$	(597	)	$	39
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 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 may not agree to amounts presented in the Duke Energy Condensed Consolidated Balance Sheets.
		September 30, 2014
	(in millions)	Duke Energy			Duke Energy Ohio
	Current assets	$	335		$	284
	Investments and other assets	43			38
	Property, plant and equipment	2,675			2,644
	Total assets held for sale	$	3,053		$	2,966
	Current liabilities	$	284		$	269
	Deferred credits and other liabilities	57			57
	Total liabilities associated with assets held for sale	$	341		$	326

Business_Segments_Tables

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting Information [Line Items]	'
Business Segment Data	'
	The following table summarizes the net loss for Other at each of these registrants.
		Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013			2014			2013
	Duke Energy Carolinas	$	(19	)	$	(26	)	$	(67	)	$	(69	)
	Progress Energy	(48		)	(72		)	(145		)	(205		)
	Duke Energy Progress	(10		)	(20		)	(23		)	(40		)
	Duke Energy Florida	(5		)	(6		)	(16		)	(18		)
	Duke Energy Indiana	(3		)	(5		)	(10		)	(13		)
		Three Months Ended September 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	5,975		$	366		$	50		$	6,391		$	4		$	—		$	6,395
	Intersegment revenues	11			—			—			11			21			(32		)	—
	Total revenues	$	5,986		$	366		$	50		$	6,402		$	25		$	(32	)	$	6,395
	Segment income (loss)(a)	$	920		$	80		$	(17	)	$	983		$	(92	)	$	(3	)	$	888
	Add back noncontrolling interests component																			3
	Income from discontinued operations, net of tax																			378
	Net income																			$	1,269
	Segment assets	$	105,172		$	5,159		$	6,196		$	116,527		$	2,944		$	185		$	119,656
	(a)    Other includes costs to achieve the Progress Energy merger.
		Three Months Ended September 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)	$	5,768		$	370		$	56		$	6,194		$	23		$	—		$	6,217
	Intersegment revenues	18			—			2			20			24			(44		)	—
	Total revenues	$	5,786		$	370		$	58		$	6,214		$	47		$	(44	)	$	6,217
	Segment income (loss)(a)(b)	$	923		$	116		$	(28	)	$	1,011		$	(64	)	$	(5	)	$	942
	Add back noncontrolling interests component																			4
	Income from discontinued operations, net of tax																			62
	Net income																			$	1,008
	(a)	In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Nine Months Ended September 30, 2014
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues	$	17,041		$	1,111		$	195		$	18,347		$	19		$	—		$	18,366
	Intersegment revenues	33			—			—			33			60			(93		)	—
	Total revenues	$	17,074		$	1,111		$	195		$	18,380		$	79		$	(93	)	$	18,366
	Segment income (loss)(a)(b)	$	2,346		$	356		$	(70	)	$	2,632		$	(269	)	$	(7	)	$	2,356
	Add back noncontrolling interests component																			11
	Loss from discontinued operations, net of tax																			(578		)
	Net income																			$	1,789
	(a)	Commercial Power recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
	(b)	Other includes costs to achieve the Progress Energy merger.
		Nine Months Ended September 30, 2013
	(in millions)	Regulated Utilities			International			Commercial			Total			Other			Eliminations			Consolidated
					Energy			Power			Reportable
											Segments
	Unaffiliated revenues(a)(b)(c)(d)	$	15,731		$	1,168		$	184		$	17,083		$	49		$	—		$	17,132
	Intersegment revenues	35			—			5			40			64			(104		)	—
	Total revenues	$	15,766		$	1,168		$	189		$	17,123		$	113		$	(104	)	$	17,132
	Segment income (loss)(a)(b)(c)(d)(e)(f)	$	1,932		$	300		$	(54	)	$	2,178		$	(278	)	$	(10	)	$	1,890
	Add back noncontrolling interest																			12
	Income from discontinued operations, net of tax																			82
	Net income																			$	1,984
	(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 June 2013, 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)	In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
	(d)	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
	(e)	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 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.
(f)	Other includes costs to achieve the Progress Energy merger.
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 September 30, 2014
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues	$	440		$	6		$	446		$	—		$	—		$	446
	Intersegment revenues	1			—			1			—			(1		)	—
	Total revenues	$	441		$	6		$	447		$	—		$	(1	)	$	446
	Segment income (loss)	$	43		$	(13	)	$	30		$	(4	)	$	—		$	26
	Income from discontinued operations, net of tax																$	413
	Net income																439
	Segment assets	$	7,297		$	3,266		$	10,563		$	131		$	(622	)	$	10,072
		Three Months Ended September 30, 2013
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues	$	421		$	17		$	438		$	—		$	—		$	438
	Total revenues	$	421		$	17		$	438		$	—		$	—		$	438
	Segment income (loss)	$	42		$	(13	)	$	29		$	(5	)	$	—		$	24
	Income from discontinued operations, net of tax																35
	Net income																$	59
		Nine Months Ended September 30, 2014
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues	$	1,416		$	17		$	1,433		$	—		$	—		$	1,433
	Intersegment revenues	1			—			1			—			(1		)	—
	Total revenues	$	1,417		$	17		$	1,434		$	—		$	(1	)	$	1,433
	Segment income (loss)(a)	$	151		$	(101	)	$	50		$	(11	)	$	—		$	39
	Loss from discontinued operations, net of tax																(597		)
	Net loss																$	(558	)
	a)	Duke Energy Ohio recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
		Nine Months Ended September 30, 2013
	(in millions)	Regulated Utilities			Commercial Power			Total Reportable Segments			Other			Eliminations			Consolidated
	Unaffiliated revenues	$	1,317		$	32		$	1,349		$	—		$	—		$	1,349
	Total revenues	$	1,317		$	32		$	1,349		$	—		$	—		$	1,349
	Segment income (loss)	$	122		$	(51	)	$	71		$	(14	)	$	—		$	57
	Income from discontinued operations, net of tax																39
	Net income																$	96

Regulatory_Matters_Tables

Regulatory Matters (Tables)	9 Months Ended
	Sep. 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-Sep-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)	$	256		$	19		$	109		$	109		$	9		$	119
	(a)	Included in Property, plant and equipment, net as of September 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 and were retired October 1, 2014.
	(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.
		September 30, 2014
								Remaining Amount to be Refunded
	(in millions)	Total			Refunded to date			2014			2015			2016
	2012 Settlement refund	$	288		$	233		$	35		$	10		$	10
	Retirement decision refund	100			—			—			40			60
	NEIL proceeds	490			449			41			—			—
	Total customer refunds	$	878		682			76			50			70
	Accelerated regulatory asset recovery	(130		)	(28		)	(9		)	(37		)	(56		)
	Net customer refunds	$	748		$	654		$	67		$	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 September 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-Sep-14
					Adjustments			Reductions
	Duke Energy Ohio	$	95		$	3		$	(3	)	$	95

Commitments_and_Contingencies_

Commitments and Contingencies (Table)	9 Months Ended
	Sep. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]	'
Schedule of Loss Contingencies	'
	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)	September 30, 2014			December 31, 2013
	Reserves for Legal Matters
	Duke Energy	$	227		$	204
	Progress Energy	70			78
	Duke Energy Progress	9			10
	Duke Energy Florida	41			43
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	$	83
	Duke Energy Carolinas	25
	Progress Energy	9
	Duke Energy Progress	2
	Duke Energy Florida	7
	Duke Energy Ohio	42
	Duke Energy Indiana	7
Reserve for Environmental Costs [Member]	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'
Schedule of 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.
		Nine Months Ended September 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	34			(1		)	4			3			1			28			3
	Cash reductions	(8		)	—			(6		)	(4		)	(2		)	(1		)	(1		)
	Balance at end of period	$	105		$	10		$	25		$	7		$	18		$	54		$	9
		Nine Months Ended September 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	6			—			5			1			4			(1		)	1
	Cash reductions	(17		)	—			(6		)	(2		)	(4		)	(8		)	(2		)
	Balance at end of period	$	64		$	12		$	32		$	13		$	19		$	6		$	7

Debt_and_Credit_Facilities_Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Schedule Of 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			September 30, 2014
	Unsecured Debt
	Duke Energy (Parent)	Apr-15		3.35	%		$	450
	First Mortgage Bonds
	Duke Energy Ohio	Mar-15		0.373	%		150
	Duke Energy Progress	Apr-15		5.15	%		300
	Other						256
	Current maturities of long-term debt						$	1,156
	The following table summarizes significant debt issuances (in millions).
							Nine Months Ended September 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		0.612	%		400			—			—			400
	June 2014(b)	May-19		11.87	%		—			—			—			108
	June 2014(b)	May-21		13.68	%		—			—			—			110
	Secured Debt
	March 2014(c)	Mar-17		0.854	%		—			—			225			225
	July 2014(d)	Jul-36		5.34	%		—			—			—			129
	First Mortgage Bonds
	March 2014(e)	Mar-44		4.375	%		—			400			—			400
	March 2014(e)	Mar-17		0.433	%		—			250			—			250
	Total issuances						$	1,000		$	650		$	225		$	2,222
	(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 9 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.
	(b)	Proceeds were used to repay $196 million of debt 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 13 for further details.
	(d)	Proceeds were used to fund a portion of Duke Energy's prior investment in the existing Wind Star renewables portfolio.
	(e)	Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.
Schedule Of Line Of Credit Facilities	'
	The table below includes the current borrowing sublimits and available capacity under the Master Credit Facility.
		September 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
	Commercial paper(b)	(1,278		)		(784		)	(300		)	(27		)	—			(4		)	(163		)
	Outstanding letters of credit	(64		)		(56		)	(4		)	(2		)	(1		)	—			(1		)
	Tax-exempt bonds	(116		)		—			(35		)	—			—			—			(81		)
	Available capacity	$	4,542			$	1,410		$	661		$	721		$	649		$	646		$	455
	(a)	Represents the sublimit of each borrower.
	(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 Payable to Affiliated Companies in Duke Energy Carolinas' and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2014
Asset Retirement Obligations [Abstract]	'
Schedule of Change in Asset Retirement Obligation	'
	The following table presents changes in the liability associated with asset retirement obligations for Duke Energy and the Subsidiary Registrants impacted by the Coal Ash Act and the agreement with SCDHEC.
	(in millions)	Duke Energy			Duke Energy Carolinas		Progress Energy			Duke Energy Progress
	Balance at December 31, 2013(a)(b)	$	4,958		$	1,594	$	2,570		$	1,737
	Accretion expense(c)	164			71		91			63
	Liabilities settled	(56		)	—		(52		)	—
	Liabilities incurred in the current year(d)	3,433			2,026		1,406			1,406
	Balance at September 30, 2014	$	8,499		$	3,691	$	4,015		$	3,206
	(a)	The balance as of December 31, 2013 primarily relates to decommissioning nuclear power facilities, asbestos removal and closure of landfills at fossil generation facilities.
	(b)	The balance at December 31, 2013 includes $8 million reported in Other current liabilities on the Condensed Consolidated Balance Sheets at Duke Energy, Progress Energy and Duke Energy Progress.
	(c)	Substantially all accretion expense for the nine months ended September 30, 2014 relates to Duke Energy's regulated electric operations from previously established asset retirement obligations and has been deferred in accordance with regulatory accounting treatment.
	(d)	Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.

Goodwill_Tables

Goodwill (Tables)	9 Months Ended
	Sep. 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	—			(9		)	—			(9		)
	Balance at September 30, 2014
	Goodwill	15,950			317			935			17,202
	Accumulated impairment charges	—			—			(871		)	(871		)
	Balance at September 30, 2014, as adjusted for accumulated impairment charges	$	15,950		$	317		$	64		$	16,331
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 September 30, 2014
	Goodwill	1,136			1,188			2,324
	Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
	Balance at September 30, 2014, as adjusted for accumulated impairment charges	$	920		$	—		$	920

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2014
Duke Energy Carolinas [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.
Progress Energy [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.
Duke Energy Progress [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.
Duke Energy Florida [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.
Duke Energy Ohio [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.
Duke Energy Indiana [Member]	'
Related Party Transaction [Line Items]	'
Schedule of Related Party Transactions, Other Revenue and Expense	'
	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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Duke Energy Carolinas
	Corporate governance and shared service expenses(a)	$	199	$	236	$	638	$	714
	Indemnification coverages(b)	5		5		16		16
	Joint Dispatch Agreement (JDA) revenue(c)	13		24		125		101
	Joint Dispatch Agreement (JDA) expense(c)	36		39		127		71
	Progress Energy
	Corporate governance and shared services provided by Duke Energy(a)	$	182	$	54	$	560	$	327
	Corporate governance and shared services provided to Duke Energy(d)	—		24		—		74
	Indemnification coverages(b)	8		9		25		26
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Progress
	Corporate governance and shared service expenses(a)	$	91	$	33	$	291	$	195
	Indemnification coverages(b)	4		5		13		15
	JDA revenue(c)	36		39		127		71
	JDA expense(c)	13		24		125		101
	Duke Energy Florida
	Corporate governance and shared service expenses(a)	$	91	$	20	$	269	$	131
	Indemnification coverages(b)	4		4		12		11
	Duke Energy Ohio
	Corporate governance and shared service expenses(a)	$	83	$	89	$	242	$	261
	Indemnification coverages(b)	3		3		10		11
	Duke Energy Indiana
	Corporate governance and shared service expenses(a)	$	94	$	113	$	293	$	313
	Indemnification coverages(b)	3		5		8		10
	(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)	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended September 30, 2014.

Derivatives_and_Hedging_Tables

Derivatives and Hedging (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative [Line Items]	'
Underlying Notional Amounts for Commodity Derivative Instruments Accounted for at Fair Value	'
	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.
		September 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)	29,569			—			—		—		—			25,680			607
	Natural gas (millions of decatherms)	659			—			319		117		202			340			—
		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.
		September 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 Variable Interest Entities (VIEs) of $552 million at September 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.
		September 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	—				14			—			18
	Deferred Credits and Other Liabilities: Other	—				23			—			4
	Total Derivatives Designated as Hedging Instruments	16				38			27			23
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	36				—			201			158
	Current Assets: Assets Held for Sale	2				2			—			—
	Investments and Other Assets: Other	9				—			215			131
	Investments and Other Assets: Assets Held for Sale	9				2			—			—
	Current Liabilities: Other	4				123			13			153
	Current Liabilities: Liabilities Associated with Assets Held for Sale	346				445			—			—
	Deferred Credits and Other Liabilities: Other	—				37			5			166
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	148				260			—			—
	Interest rate contracts
	Current Liabilities: Other	—				1			—			1
	Deferred Credits and Other Liabilities: Other	—				5			—			4
	Total Derivatives Not Designated as Hedging Instruments	554				875			434			613
	Total Derivatives	$	570			$	913		$	461		$	636
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.
		Derivative Assets
		30-Sep-14							31-Dec-13
	(in millions)	Current(a)				Non-Current(b)			Current(e)			Non-Current(f)
	Gross amounts recognized	$	388			$	175		$	214		$	233
	Gross amounts offset	(362		)		(127		)	(179		)	(138		)
	Net amount subject to master netting	26				48			35			95
	Amounts not subject to master netting	—				7			—			14
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	26			$	55		$	35		$	109
		Derivative Liabilities
		30-Sep-14							31-Dec-13
	(in millions)	Current(c)				Non-Current(d)			Current(g)			Non-Current(h)
	Gross amounts recognized	$	583			$	314		$	322		$	299
	Gross amounts offset	(402		)		(203		)	(192		)	(155		)
	Net amounts subject to master netting	181				111			130			144
	Amounts not subject to master netting	3				13			4			11
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	184			$	124		$	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.
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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Pretax Gains (Losses) Recorded in AOCI
	Interest rate contracts	$	(6	)		$	—		$	(15	)	$	71
	Commodity contracts	—				—			—			1
	Total Pretax Gains (Losses) Recorded in AOCI	$	(6	)		$	—		$	(15	)	$	72
	Location of Pretax Gains (Losses) Reclassified from AOCI into Earnings
	Interest rate contracts
	Interest expense	(2		)		—			(7		)	(2		)
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 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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Revenue: Regulated electric	$	—			$	3		$	—		$	10
	Revenue: Nonregulated electric, natural gas and other	—				(7		)	—			(7		)
	Fuel used in electric generation and purchased power - regulated	32				(68		)	18			(157		)
	Fuel used in electric generation and purchased power - nonregulated	—				(2		)	—			—
	Loss from Discontinued Operations	(319		)		—			(825		)	(28		)
	Interest rate contracts
	Interest expense	9				(4		)	—			(13		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(278	)		$	(78	)	$	(807	)	$	(195	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	3			$	(29	)	$	2		$	(34	)
	Regulatory liabilities	1				6			—			10
	Interest rate contracts
	Regulatory assets	(7		)		12			9			51
	Regulatory liabilities	(12		)		—			16			—
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(15	)		$	(11	)	$	27		$	27
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.
		September 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	$	688			$	107		$	38		$	69			$	688
	Fair value of collateral already posted	202				—			—			—				202
	Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	86				107			38			69				86
		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	'
	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, Duke Energy Progress and Duke Energy Indiana were not material.
		September 30, 2014				December 31, 2013
	(in millions)	Receivables				Receivables
	Duke Energy
	Amounts offset against net derivative positions	$	116			$	30
	Amounts not offset against net derivative positions	86				122
	Progress Energy
	Amounts offset against net derivative positions	—				10
	Duke Energy Florida
	Amounts offset against net derivative positions	—				10
	Duke Energy Ohio
	Amounts offset against net derivative positions	116				19
	Amounts not offset against net derivative positions	86				115
Progress Energy [Member]	'
Derivative [Line Items]	'
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.
		September 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	—				—			3			2
	Investments and Other Assets: Other	—				—			2			1
	Current Liabilities: Other	1				115			11			105
	Deferred Credits and Other Liabilities: Other	1				29			4			91
	Total Derivatives Not Designated as Hedging Instruments	2				144			20			199
	Total Derivatives	$	2			$	144		$	20		$	204
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.
		Derivative Assets
		30-Sep-14							31-Dec-13
	(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
	Gross amounts recognized	$	1			$	1		$	15		$	5
	Gross amounts offset	(1		)		(1		)	(13		)	(4		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	2		$	1
		Derivative Liabilities
		30-Sep-14							31-Dec-13
	(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	115			$	29		$	107		$	93
	Gross amounts offset	(1		)		(1		)	(17		)	(10		)
	Net amounts subject to master netting	114				28			90			83
	Amounts not subject to master netting	—				—			—			4
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	114			$	28		$	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.
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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Operating revenues	$	1			$	3		$	—		$	10
	Fuel used in electric generation and purchased power	32				(68		)	18			(157		)
	Interest rate contracts
	Interest expense	—				(4		)	—			(13		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	33			$	(69	)	$	18		$	(160	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	3			$	(31	)	$	19		$	(34	)
	Interest rate contracts
	Regulatory assets	—				4			—			13
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	3			$	(27	)	$	19		$	(21	)
Duke Energy Progress [Member]	'
Derivative [Line Items]	'
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. Substantially all derivatives not designated as hedging instruments receive regulatory accounting treatment.
		September 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
	Investments and Other Assets: Other	—				—			2			1
	Current Liabilities: Other	2				39			2			40
	Deferred Credits and Other Liabilities: Other	1				8			2			29
	Total Derivatives Not Designated as Hedging Instruments	3				47			6			70
	Total Derivatives	$	3			$	48		$	6		$	71
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.
		Derivative Assets
		30-Sep-14							31-Dec-13
	(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
	Gross amounts recognized	$	2			$	1		$	3		$	3
	Gross amounts offset	(2		)		(1		)	(3		)	(3		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	—		$	—
		Derivative Liabilities
		30-Sep-14							31-Dec-13
	(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	40			$	8		$	41		$	30
	Gross amounts offset	(2		)		(1		)	(3		)	(3		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	38			$	7		$	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.
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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Operating revenues	$	1			$	3		$	—		$	10
	Fuel used in electric generation and purchased power	13				(24		)	4			(53		)
	Interest rate contracts
	Interest expense	—				(3		)	—			(9		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	14			$	(24	)	$	4		$	(52	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	(19	)		$	(11	)	$	21		$	(18	)
	Interest rate contracts
	Regulatory assets	—				3			—			10
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	(19	)		$	(8	)	$	21		$	(8	)
Duke Energy Florida [Member]	'
Derivative [Line Items]	'
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. Substantially all derivatives not designated as hedging instruments receive regulatory accounting treatment.
		September 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	$	—			$	—		$	3		$	2
	Current Liabilities: Other	1				75			9			64
	Deferred Credits and Other Liabilities: Other	1				21			2			63
	Total Derivatives	$	2			$	96		$	14		$	129
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.
		Derivative Assets
		30-Sep-14							31-Dec-13
	(in millions)	Current(a)				Non-Current(b)			Current(a)			Non-Current(b)
	Gross amounts recognized	$	1			$	1		$	12		$	2
	Gross amounts offset	(1		)		(1		)	(10		)	(2		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	—			$	—		$	2		$	—
		Derivative Liabilities
		30-Sep-14							31-Dec-13
	(in millions)	Current(c)				Non-Current(d)			Current(c)			Non-Current(d)
	Gross amounts recognized	$	75			$	21		$	66		$	63
	Gross amounts offset	(1		)		(1		)	(15		)	(7		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	74			$	20		$	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.
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.
		Three Months Ended September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Fuel used in electric generation and purchased power	20				(45		)	14			(105		)
	Interest rate contracts
	Interest expense	—				(1		)	—			(3		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	20			$	(46	)	$	14		$	(108	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	22			$	(19	)	$	(2	)	$	(16	)
	Interest rate contracts
	Regulatory assets	—				1			—			3
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	22			$	(18	)	$	(2	)	$	(13	)
Duke Energy Ohio [Member]	'
Derivative [Line Items]	'
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.
		September 30, 2014							December 31, 2013
	(in millions)	Asset				Liability			Asset			Liability
	Derivatives Not Designated as Hedging Instruments
	Commodity contracts
	Current Assets: Other	$	2			$	—		$	186		$	163
	Current Assets: Assets Held for Sale	1				1			—			—
	Investments and Other Assets: Other	—				—			202			130
	Investments and Other Assets: Assets Held for Sale	9				2			—			—
	Current Liabilities: Other	—				—			1			36
	Current Liabilities: Liabilities Associated with Assets Held for Sale	378				484			—			—
	Deferred Credits and Other Liabilities: Other	—				—			2			56
	Deferred Credits and Other Liabilities: Liabilities Associated with Assets Held for Sale	174				287			—			—
	Interest rate contracts
	Current Liabilities: Other	—				—			—			1
	Deferred Credits and Other Liabilities: Other	—				4			—			4
	Total Derivatives Designated as Hedging Instruments	564				778			391			390
	Total Derivatives	$	564			$	778		$	391		$	390
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.
		Derivative Assets
		30-Sep-14							31-Dec-13
	(in millions)	Current(a)				Non-Current(b)			Current(e)			Non-Current(f)
	Gross amounts recognized	$	381			$	183		$	186		$	205
	Gross amounts offset	(377		)		(177		)	(165		)	(132		)
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	4			$	6		$	21		$	73
		Derivative Liabilities
		30-Sep-14							31-Dec-13
	(in millions)	Current(c)				Non-Current(d)			Current(g)			Non-Current(h)
	Gross amounts recognized	$	485			$	293		$	199		$	186
	Gross amounts offset	(419		)		(251		)	(173		)	(143		)
	Net amounts subject to master netting	66				42			26			43
	Amounts not subject to master netting	—				—			1			4
	Net amounts recognized on the Condensed Consolidated Balance Sheet	$	66			$	42		$	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.
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 September 30,							Nine Months Ended September 30,
	(in millions)	2014				2013			2014			2013
	Location of Pretax Gains and (Losses) Recognized in Earnings
	Commodity contracts
	Income (Loss) from Discontinued Operations	$	(303	)		$	3		$	(887	)	$	(28	)
	Interest rate contracts
	Interest expense	—				—			(1		)	(1		)
	Total Pretax Gains (Losses) Recognized in Earnings	$	(303	)		$	3		$	(888	)	$	(29	)
	Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
	Commodity contracts
	Regulatory assets	$	—			$	—		$	(1	)	$	—
	Interest rate contracts
	Regulatory assets	—				—			—			3
	Regulatory liabilities	—				—			6			—
	Total Pretax Gains (Losses) Recognized as Regulatory Assets or Liabilities	$	—			$	—		$	5		$	3

Investments_in_Debt_and_Equity1

Investments in Debt and Equity Securities (Tables)	9 Months Ended
	Sep. 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.
		September 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	$	—	$	—	$	74	$	—	$	—	$	110
	Equity securities	1,943		28		3,825		1,813		10		3,579
	Corporate debt securities	13		3		493		8		6		400
	Municipal bonds	5		1		132		2		6		160
	U.S. government bonds	12		4		713		7		12		730
	Other debt securities	—		1		137		22		2		154
	Total NDTF	$	1,973	$	37	$	5,374	$	1,852	$	36	$	5,133
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	16	$	—	$	—	$	21
	Equity securities	32		—		95		29		—		91
	Corporate debt securities	2		—		68		1		1		99
	Municipal bonds	3		—		82		2		2		79
	U.S. government bonds	—		—		16		—		—		17
	Other debt securities	1		5		96		—		8		111
	Total Other Investments(a)	$	38	$	5	$	373	$	32	$	11	$	418
	Total Investments	$	2,011	$	42	$	5,747	$	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)	September 30, 2014
	Due in one year or less	$	33
	Due after one through five years	452
	Due after five through 10 years	457
	Due after 10 years	795
	Total	$	1,737
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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	28	$	72	$	90	$	135
	Realized losses	51		16		57		38
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.
		September 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	$	—	$	—	$	39	$	—	$	—	$	42
	Equity securities	1,046		17		2,124		974		6		1,964
	Corporate debt securities	7		3		345		5		5		274
	Municipal bonds	1		—		22		—		2		54
	U.S. government bonds	4		2		317		3		7		354
	Other debt securities	—		1		122		22		2		146
	Total NDTF	$	1,058	$	23	$	2,969	$	1,004	$	22	$	2,834
	Other Investments
	Other debt securities	$	—	$	1	$	3	$	—	$	1	$	3
	Total Other Investments(a)	$	—	$	1	$	3	$	—	$	1	$	3
	Total Investments	$	1,058	$	24	$	2,972	$	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)	September 30, 2014
	Due in one year or less	$	2
	Due after one through five years	171
	Due after five through 10 years	256
	Due after 10 years	380
	Total	$	809
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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	20	$	49	$	72	$	95
	Realized losses	48		1		50		11
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.
		September 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	$	—	$	—	$	35	$	—	$	—	$	68
	Equity securities	897		11		1,701		839		4		1,615
	Corporate debt securities	6		—		148		3		1		126
	Municipal bonds	4		1		110		2		4		106
	U.S. government bonds	8		2		396		4		5		376
	Other debt securities	—		—		15		—		—		8
	Total NDTF	$	915	$	14	$	2,405	$	848	$	14	$	2,299
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	15	$	—	$	—	$	20
	Municipal bonds	3		—		43		1		—		39
	Total Other Investments(a)	$	3	$	—	$	58	$	1	$	—	$	59
	Total Investments	$	918	$	14	$	2,463	$	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)	September 30, 2014
	Due in one year or less	$	21
	Due after one through five years	218
	Due after five through 10 years	145
	Due after 10 years	328
	Total	$	712
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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	8	$	22	$	17	$	37
	Realized losses	3		11		6		20
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.
		September 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	$	—	$	—	$	28	$	—	$	—	$	48
	Equity securities	574		7		1,127		535		3		1,069
	Corporate debt securities	4		—		95		3		1		80
	Municipal bonds	4		1		108		2		4		104
	U.S. government bonds	6		2		257		4		3		232
	Other debt securities	—		—		8		—		—		5
	Total NDTF	$	588	$	10	$	1,623	$	544	$	11	$	1,538
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	2
	Total Other Investments(a)	$	—	$	—	$	2	$	—	$	—	$	2
	Total Investments	$	588	$	10	$	1,625	$	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)	September 30, 2014
	Due in one year or less	$	10
	Due after one through five years	147
	Due after five through 10 years	94
	Due after 10 years	217
	Total	$	468
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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	4	$	7	$	11	$	15
	Realized losses	2		2		4		6
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.
		September 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	$	—	$	—	$	7	$	—	$	—	$	20
	Equity securities	323		4		574		304		1		546
	Corporate debt securities	2		—		53		—		—		46
	Municipal bonds	—		—		2		—		—		2
	U.S. government bonds	2		—		139		—		2		144
	Other debt securities	—		—		7		—		—		3
	Total NDTF	$	327	$	4	$	782	$	304	$	3	$	761
	Other Investments
	Cash and cash equivalents	$	—	$	—	$	—	$	—	$	—	$	3
	Municipal bonds	3		—		43		1		—		39
	Total Other Investments(a)	$	3	$	—	$	43	$	1	$	—	$	42
	Total Investments	$	330	$	4	$	825	$	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)	September 30, 2014
	Due in one year or less	$	11
	Due after one through five years	71
	Due after five through 10 years	51
	Due after 10 years	111
	Total	$	244
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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Realized gains	$	3	$	14	$	5	$	22
	Realized losses	1		9		2		13
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.
		September 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	26		—		68		24		—		65
	Municipal bonds	—		—		30		—		1		28
	Total Other Investments(a)	$	26	$	—	$	99	$	24	$	1	$	94
	Total Investments	$	26	$	—	$	99	$	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)	September 30, 2014
	Due in one year or less	$	1
	Due after one through five years	18
	Due after five through 10 years	8
	Due after 10 years	3
	Total	$	30

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	3,824			$	3,649			$	3			$	172
	Nuclear decommissioning trust fund debt securities	1,550				388				1,162				—
	Other trading and available-for-sale equity securities	96				96				—				—
	Other trading and available-for-sale debt securities	284				31				238				15
	Derivative assets	85				6				45				34
	Total assets	5,839				4,170				1,448				221
	Derivative liabilities	(428		)		(119		)		(253		)		(56		)
	Net assets	$	5,411			$	4,051			$	1,195			$	165
		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
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 September 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	188			$	22			$	210
	Total pretax realized or unrealized gains (losses) included in earnings	—				(33		)		(33		)
	Purchases, sales, issuances and settlements:
	Purchases	13				(1		)		12
	Sales	(13		)		—				(13		)
	Issuances	—				1				1
	Transfers out of Level 3 due to observability of inputs	—				(1		)		(1		)
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4				(10		)		(6		)
	Balance at end of period	$	192			$	(22	)		$	170
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(49	)		$	(49	)
		Three Months Ended September 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	97			$	(87	)		$	10
	Total pretax realized or unrealized gains (losses) included in earnings	—				13				13
	Total pretax gains included in other comprehensive income	1				—				1
	Purchases, sales, issuances and settlements:
	Purchases	2				—				2
	Sales	(2		)		—				(2		)
	Issuances	—				4				4
	Settlements	(2		)		(3		)		(5		)
	Transfers out of Level 3 due to observability of inputs	—				34				34
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				1				2
	Balance at end of period	$	97			$	(38	)		$	59
		Nine Months Ended September 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	—				(21		)		(21		)
	Purchases, sales, issuances and settlements:
	Purchases	29				50				79
	Sales	(15		)		—				(15		)
	Settlements	—				(45		)		(45		)
	Transfers out of Level 3 due to observability of inputs	68				(4		)		64
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	12				(15		)		(3		)
	Balance at end of period	$	192			$	(22	)		$	170
	Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	$	—			$	(49	)		$	(49	)
		Nine Months Ended September 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	—				(8		)		(8		)
	Total pretax gains included in other comprehensive income	(1		)		—				(1		)
	Purchases, sales, issuances and settlements:
	Purchases	5				21				26
	Sales	(5		)		—				(5		)
	Issuances	—				9				9
	Settlements	(3		)		(5		)		(8		)
	Transfers out of Level 3 due to observability of inputs	—				34				34
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	3				(4		)		(1		)
	Balance at end of period	$	97			$	(38	)		$	59
Quantitative Information Table - Level 3	'
	The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
		30-Sep-14
	Investment Type	Fair Value			Valuation Technique	Unobservable Input	Range
		(in millions)
	Duke Energy
	Natural gas contracts	$	(33	)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	2.45		-	$	4.66
	Financial transmission rights (FTRs)	22			RTO auction pricing	FTR price - per MWh	(2.47		)	-	12.92
	Electricity contracts	(2		)	Discounted cash flow	Forward electricity curves - price per MWh	25.18			-	59.17
	Commodity capacity option contracts	5			Discounted cash flow	Forward capacity option curves - price per MW day	28.6			-	189.25
	Reserves	(14		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	(22	)
	Duke Energy Ohio
	Electricity contracts	$	(10	)	Discounted cash flow	Forward electricity curves - price per MWh	25.35			-	59.6
	Natural gas contracts	(33		)	Discounted cash flow	Forward natural gas curves - price per MMBtu	2.45			-	4.66
	Reserves	(12		)		Bid-ask spreads, implied volatility, probability of default
	Total Level 3 derivatives	$	(55	)
	Duke Energy Indiana
	FTRs	$	22		RTO auction pricing	FTR price - per MWh	(2.47		)	-	12.92
		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.
		September 30, 2014							December 31, 2013
	(in millions)	Book Value			Fair Value				Book Value			Fair Value
	Duke Energy	$	39,858		$	43,602			$	40,256		$	42,592
	Duke Energy Carolinas	8,394			9,426				8,436			9,123
	Progress Energy	14,512			16,305				14,115			15,234
	Duke Energy Progress	5,716			6,013				5,235			5,323
	Duke Energy Florida	5,102			5,867				4,886			5,408
	Duke Energy Ohio	1,783			1,967				2,188			2,237
	Duke Energy Indiana	3,795			4,356				3,796			4,171
Duke Energy Carolinas [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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	2,124			$	1,949			$	3			$	172
	Nuclear decommissioning trust fund debt securities	845				150				695				—
	Other trading and available-for-sale debt securities	3				—				—				3
	Net assets	$	2,972			$	2,099			$	698			$	175
		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
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 September 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	171			$	(3	)		$	168
	Purchases, sales, issuances and settlements:
	Purchases	13				—				13
	Sales	(13		)		—				(13		)
	Settlements	—				3				3
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4				—				4
	Balance at end of period	$	175			$	—			$	175
		Three Months Ended September 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	74			$	(4	)		$	70
	Purchases, sales, issuances and settlements:
	Purchases	2				—				2
	Sales	(2		)		—				(2		)
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	1				—				1
	Balance at end of period	$	75			$	(4	)		$	71
		Nine Months Ended September 30, 2014
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	81			$	(2	)		$	79
	Purchases, sales, issuances and settlements:
	Purchases	29				—				29
	Sales	(15		)		—				(15		)
	Settlements	—				2				2
	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	12				—				12
	Balance at end of period	$	175			$	—			$	175
		Nine Months Ended September 30, 2013
	(in millions)	Investments				Derivatives (net)				Total
	Balance at beginning of period	$	72			$	(12	)		$	60
	Purchases, sales, issuances and settlements:
	Purchases	5				—				5
	Sales	(5		)		—				(5		)
	Settlements	—				8				8
	Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	3				—				3
	Balance at end of period	$	75			$	(4	)		$	71
Progress Energy [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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,700			$	1,700			$	—			$	—
	Nuclear decommissioning trust fund debt securities	705				238				467				—
	Other trading and available-for-sale debt securities	58				15				43				—
	Total assets	2,463				1,953				510				—
	Derivative liabilities	(142		)		—				(142		)		—
	Net assets	$	2,321			$	1,953			$	368			$	—
		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			$	—
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 September 30,								Nine Months Ended September 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	—			$	(35	)		$	—			$	(38	)
	Purchases, sales, issuances and settlements:
	Issuances	—				2				—				10
	Transfers out of Level 3 due to observability of inputs	2				34				—				34
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(2		)		(1		)		—				(6		)
	Balance at end of period	$	—			$	—			$	—			$	—
Duke Energy Progress [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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	1,126			$	1,126			$	—			$	—
	Nuclear decommissioning trust fund debt securities	497				155				342				—
	Other trading and available-for-sale debt securities	2				2				—				—
	Total assets	1,625				1,283				342				—
	Derivative liabilities	(45		)		—				(45		)		—
	Net assets	$	1,580			$	1,283			$	297			$	—
		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			$	—
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 September 30,								Nine Months Ended September 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	—			$	(35	)		$	—			$	(38	)
	Purchases, sales, issuances and settlements:
	Issuances	—				—				—				9
	Settlements	—				2				—				—
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—				(1		)		—				(5		)
	Transfers out of Level 3 due to observability of inputs	—				34				—				34
	Balance at end of period	$	—			$	—			$	—			$	—
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 10. See Note 11 for additional information related to investments by major security type.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Nuclear decommissioning trust fund equity securities	$	574			$	574			$	—			$	—
	Nuclear decommissioning trust fund debt securities and other	208				83				125				—
	Other trading and available-for-sale debt securities and other	43				—				43				—
	Derivative assets	3				—				3				—
	Total assets	828				657				171				—
	Derivative liabilities	(97		)		—				(97		)		—
	Net assets	$	731			$	657			$	74			$	—
		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]	'
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 10.
		September 30, 2014
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Derivative assets	$	7			$	—			$	3			$	4
	Derivative liabilities	(221		)		(114		)		(48		)		(59		)
	Net assets (liabilities)	$	(214	)		$	(114	)		$	(45	)		$	(55	)
		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	)
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 September 30,								Nine Months Ended September 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	(28	)		$	(19	)		$	(4	)		$	(6	)
	Total pretax realized or unrealized gains (losses) included in earnings	(24		)		11				(43		)		(4		)
	Purchases, sales, issuances and settlements:
	Purchases	—				—				1				1
	Settlements	(2		)		2				(6		)		—
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(1		)		—				1				3
	Transfers out of Level 3 due to observability of inputs	—				—				(4		)		—
	Balance at end of period	$	(55	)		$	(6	)		$	(55	)		$	(6	)
	Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at June 30, 2014									$	(52	)
Duke Energy Indiana [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 10. See Note 11 for additional information related to investments by major security type.
		30-Sep-14
	(in millions)	Total Fair Value				Level 1				Level 2				Level 3
	Available-for-sale equity securities	$	69			$	69			$	—			$	—
	Available-for-sale debt securities	30				—				30				—
	Derivative assets	23				1				—				22
	Net assets	$	122			$	70			$	30			$	22
		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
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 September 30,								Nine Months Ended September 30,
	(in millions)	2014				2013				2014				2013
	Balance at beginning of period	$	45			$	18			$	12			$	10
	Total pretax realized or unrealized gains (losses) included in earnings	(13		)		3				14				5
	Purchases, sales, issuances and settlements:
	Purchases	—				—				49				20
	Settlements	—				(10		)		(38		)		(23		)
	Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(10		)		3				(15		)		2
	Balance at end of period	$	22			$	14			$	22			$	14

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2014
Variable Interest Entities [Line Items]	'
Schedule Of Variable Interest Entities	'
	The following table outlines amounts and expiration dates of the credit facilities.
		DERF		DEPR			DEFR
	Credit facility amount (in millions)	$	400	$	300		$	225
	Expiration date	Oct-16		Dec-16			Mar-17
Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Schedule Of Variable Interest Entities	'
	The tables below show VIEs consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		September 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)	$	695		$	474			$	403		$	465		$	12		$	20		$	2,069
	Other	—			—				—			—			141			13			154
	Investments and Other Assets
	Other	—			—				—			—			29			34			63
	Property, Plant and Equipment
	Property, plant and equipment, cost(a)	—			—				—			—			1,856			18			1,874
	Accumulated depreciation and amortization	—			—				—			—			(232		)	(5		)	(237		)
	Regulatory Assets and Deferred Debits
	Other	1			—				1			—			35			—			37
	Total assets	$	696		$	474			$	404		$	465		$	1,841		$	80		$	3,960
	LIABILITIES AND EQUITY
	Current Liabilities
	Accounts payable	$	—		$	—			$	—		$	—		$	2		$	—		$	2
	Taxes accrued	—			—				—			—			6			—			6
	Current maturities of long-term debt	—			—				—			—			67			16			83
	Other	—			—				—			—			26			12			38
	Long-Term Debt(b)	400			300				225			325			989			21			2,260
	Deferred Credits and Other Liabilities
	Deferred income taxes	—			—				—			—			292			—			292
	Asset retirement obligations	—			—				—			—			31			—			31
	Other	—			—				—			—			33			10			43
	Total liabilities	$	400		$	300			$	225		$	325		$	1,446		$	59		$	2,755
	Net assets of consolidated variable interest entities	$	296		$	174			$	179		$	140		$	395		$	21		$	1,205
	(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.
Variable Interest Entity, Not Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Schedule Of Variable Interest Entities	'
	The tables below show VIEs not consolidated and how these entities impact the Condensed Consolidated Balance Sheets.
		30-Sep-14
		Duke Energy										Duke Energy			Duke Energy
	(in millions)	Renewables			Other				Total			Ohio			Indiana
	Receivables	$	—		$	—			$	—		$	49		$	76
	Investments in equity method unconsolidated affiliates	149			3				152			—			$	—
	Investments and other assets	—			4				4			—			—
	Total assets	$	149		$	7			$	156		$	49		$	76
	Other current liabilities	$	—		$	2			$	2		$	—		$	—
	Deferred credits and other liabilities	—			14				14			—			—
	Total liabilities	$	—		$	16			$	16		$	—		$	—
	Net assets (liabilities)	$	149		$	(9	)		$	140		$	49		$	76
		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
Cinergy Receivables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Schedule Of Variable Interest Entities	'
	The following table shows sales and cash flows related to receivables sold.
		Duke Energy Ohio													Duke Energy Indiana
		Three Months Ended September 30,							Nine Months Ended September 30,						Three Months Ended September 30,						Nine Months Ended September 30,
	(in millions)	2014			2013				2014			2013			2014			2013			2014			2013
	Sales
	Receivables sold	$	477		$	514			$	1,705		$	1,664		$	739		$	765		$	2,173		$	2,214
	Loss recognized on sale	3			3				9			9			3			2			8			8
	Cash flows
	Cash proceeds from receivables sold	494			518				1,761			1,674			759			758			2,233			2,204
	Collection fees received	—			—				1			1			—			—			1			1
	Return received on retained interests	—			1				3			4			2			2			5			5
	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)	September 30, 2014			December 31, 2013				September 30, 2014			December 31, 2013
	Receivables sold	$	216		$	290			$	287		$	340
	Less: Retained interests	49			114				76			143
	Net receivables sold	$	167		$	176			$	211		$	197

Common_Stock_Tables

Common Stock (Tables)	9 Months Ended
	Sep. 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.
		Three Months Ended September 30,				Nine Months Ended September 30,
	(in millions, except per share amounts)	2014		2013		2014		2013
	Income from continuing operations attributable to Duke Energy common shareholders	$	887	$	942	$	2,351	$	1,884
	Weighted-average shares outstanding - basic	707		706		707		706
	Weighted-average shares outstanding - diluted	707		706		707		706
	Earnings per share from continuing operations attributable to Duke Energy common shareholders
	Basic	$	1.25	$	1.33	$	3.33	$	2.67
	Diluted	$	1.25	$	1.33	$	3.33	$	2.67
	Potentially dilutive items excluded from the calculation(a)					2		2
	Dividends declared per common share	$	0.795	$	0.78	$	2.355	$	2.31
	(a)	Stock options and performance and unvested stock awards were not included in the dilutive securities calculation 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.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 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 September 30,				Nine Months Ended September 30,
	(in millions)	2014		2013		2014		2013
	Stock options	—		$	—	—		$	2
	Restricted stock unit awards	8		10		30		36
	Performance awards	4		7		14		25
	Total	$	12	$	17	$	44	$	63
	Tax benefit associated with stock-based compensation expense	$	5	$	6	17		$	24
	Stock-based compensation costs capitalized	1		1		3		3

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]	'
Employee Savings Plan Matching Contributions	'
	The following table includes pretax employer matching contributions 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 September 30,
	2014(a)	$	30		$	10		$	10		$	7		$	3		$	—		$	1
	2013	30			10			12			7			4			—			2
	Nine Months Ended September 30,
	2014(a)	$	110		$	36		$	33		$	23		$	10		$	2		$	5
	2013	101			34			34			19			11			2			5
	(a)	For the three and nine months ended September 30, 2014, amounts include the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan.
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 September 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		$	10		$	10		$	6		$	5		$	1		$	3
	Interest cost on projected benefit obligation	86			22			28			13			14			5			7
	Expected return on plan assets	(128		)	(33		)	(44		)	(21		)	(21		)	(7		)	(10		)
	Amortization of actuarial loss	37			8			17			8			8			1			3
	Amortization of prior service credit	(4		)	(2		)	—			—			—			—			—
	Other	3			1			1			—			—			—			—
	Net periodic pension costs	$	28		$	6		$	12		$	6		$	6		$	—		$	3
		Three Months Ended September 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	$	41		$	12		$	15		$	6		$	8		$	1		$	2
	Interest cost on projected benefit obligation	80			20			29			13			13			5			7
	Expected return on plan assets	(137		)	(37		)	(50		)	(24		)	(21		)	(7		)	(11		)
	Amortization of actuarial loss	61			15			26			11			12			3			6
	Amortization of prior service credit	(2		)	(2		)	(1		)	(1		)	(1		)	—			—
	Other	2			1			—			1			—			—			1
	Net periodic pension costs	$	45		$	9		$	19		$	6		$	11		$	2		$	5
		Nine Months Ended September 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	$	102		$	31		$	30		$	16		$	15		$	3		$	7
	Interest cost on projected benefit obligation	258			64			84			40			43			15			22
	Expected return on plan assets	(383		)	(99		)	(130		)	(64		)	(64		)	(20		)	(30		)
	Amortization of actuarial loss	111			26			51			24			24			3			9
	Amortization of prior service credit	(11		)	(6		)	(2		)	(1		)	(1		)	—			—
	Other	6			2			2			1			1			—			—
	Net periodic pension costs	$	83		$	18		$	35		$	16		$	18		$	1		$	8
		Nine Months Ended September 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	$	125		$	37		$	45		$	17		$	23		$	4		$	8
	Interest cost on projected benefit obligation	240			60			87			38			40			16			21
	Expected return on plan assets	(411		)	(111		)	(149		)	(71		)	(65		)	(22		)	(33		)
	Amortization of actuarial loss	183			45			76			34			37			9			17
	Amortization of prior service credit	(8		)	(5		)	(3		)	(1		)	(2		)	—			—
	Other	5			2			1			1			—			—			1
	Net periodic pension costs	$	134		$	28		$	57		$	18		$	33		$	7		$	14
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 September 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			2			—			—
	Amortization of actuarial loss	1			—			—			—			—
	Amortization of prior service credit	—			—			(1		)	—			—
	Net periodic pension costs	$	5		$	1		$	1		$	1		$	—
		Three Months Ended September 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	1		$	—		$	1		$	1		$	—
	Interest cost on projected benefit obligation	3			—			1			—			—
	Amortization of actuarial loss	1			—			1			1			1
	Net periodic pension costs	$	5		$	—		$	3		$	2		$	1
		Nine Months Ended September 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	2		$	—		$	1		$	1		$	—
	Interest cost on projected benefit obligation	10			1			4			1			1
	Amortization of actuarial loss	2			—			1			—			—
	Amortization of prior service credit	—			—			(1		)	—			—
	Net periodic pension costs	$	14		$	1		$	5		$	2		$	1
		Nine Months Ended September 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida
	Service cost	$	2		$	—		$	1		$	1		$	—
	Interest cost on projected benefit obligation	10			1			5			1			1
	Amortization of actuarial loss	4			—			3			1			1
	Amortization of prior service credit	(1		)	—			(1		)	—			—
	Net periodic pension costs	$	15		$	1		$	8		$	3		$	2
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 September 30, 2014
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Indiana
	Service cost	$	2		$	—		$	1		$	—		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	13			3			6			3			3			1
	Expected return on plan assets	(3		)	(2		)	—			—			—			—
	Amortization of actuarial loss	9			1			10			8			3			—
	Amortization of prior service credit	(31		)	(3		)	(24		)	(19		)	(5		)	—
	Net periodic other post-retirement benefit costs	$	(10	)	$	(1	)	$	(7	)	$	(8	)	$	1		$	1
		Three Months Ended September 30, 2013
	(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Indiana
	Service cost	$	7		$	1		$	6		$	3		$	2		$	1
	Interest cost on accumulated post-retirement benefit obligation	19			3			12			7			5			1
	Expected return on plan assets	(4		)	(2		)	—			—			—			(1		)
	Amortization of actuarial loss	13			—			13			8			4			1
	Amortization of prior service credit	(3		)	(2		)	—			—			—			—
	Net periodic other post-retirement benefit costs	$	32		$	—		$	31		$	18		$	11		$	2
		Nine Months Ended September 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	$	7		$	1		$	3		$	1		$	2		$	—		$	—
	Interest cost on accumulated post-retirement benefit obligation	38			9			17			8			9			1			4
	Expected return on plan assets	(9		)	(6		)	—			—			—			—			(1		)
	Amortization of actuarial loss (gain)	29			2			31			23			8			(1		)	—
	Amortization of prior service credit	(94		)	(8		)	(71		)	(55		)	(16		)	—			—
	Net periodic other post-retirement benefit costs	$	(29	)	$	(2	)	$	(20	)	$	(23	)	$	3		$	—		$	3
		Nine Months Ended September 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	$	21		$	2		$	17		$	9		$	6		$	—		$	1
	Interest cost on accumulated post-retirement benefit obligation	55			9			35			19			13			1			4
	Expected return on plan assets	(11		)	(7		)	—			—			—			—			(1		)
	Amortization of actuarial loss (gain)	39			2			42			26			12			(1		)	1
	Amortization of prior service credit	(9		)	(6		)	(1		)	(1		)	—			—			—
	Net periodic other post-retirement benefit costs	$	95		$	—		$	93		$	53		$	31		$	—		$	5

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Summary of Effective Tax Rates	'
	The effective tax rates from continuing operations for each of the Duke Energy Registrants are included in the following table.
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Duke Energy	34	%	30.9	%	31.4	%	32.3	%
	Duke Energy Carolinas	33.9	%	37.9	%	33.7	%	37.5	%
	Progress Energy	37.1	%	38.8	%	37.3	%	38.1	%
	Duke Energy Progress	36.3	%	35.7	%	36.6	%	37.3	%
	Duke Energy Florida	38.5	%	40	%	38.6	%	40	%
	Duke Energy Ohio	38.3	%	35.9	%	34.9	%	36.5	%
	Duke Energy Indiana	31.6	%	36.6	%	35.2	%	37.2	%

Organization_and_Basis_of_Pres3

Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	$798	$937
Duke Energy Carolinas [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	285	323
Progress Energy [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	232	189
Duke Energy Progress [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	131	120
Duke Energy Florida [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	101	69
Duke Energy Ohio [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	'	55
Duke Energy Ohio [Member] | Cinergy Receivables [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	54	89
Duke Energy Indiana [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	26	5
Duke Energy Indiana [Member] | Cinergy Receivables [Member]	'	'
Organization And Basis Of Presentation [Line Items]	'	'
Unbilled receivables	$94	$144

Organization_and_Basis_of_Pres4

Organization and Basis of Presentation (Amounts Attributable to Controlling Interests)(Details) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Income (Loss) from Continuing Operations	$891	$946	$2,367	$1,902
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	3	4	11	12
Income (Loss) from Continuing Operations Attributable to Parent	888	942	2,356	1,890
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	378	62	-578	82
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	-8	'	-8	-5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	386	62	-570	87
Net income (loss)	1,269	1,008	1,789	1,984
Net Income (Loss) Attributable to Noncontrolling Interest	-5	4	3	7
Net Income (Loss) Attributable to Parent	1,274	1,004	1,786	1,977
Progress Energy [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Income (Loss) from Continuing Operations	330	328	741	469
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	1	1	2	2
Income (Loss) from Continuing Operations Attributable to Parent	329	327	739	467
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	'	14	-6	10
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	14	-6	10
Net income (loss)	330	342	735	479
Net Income (Loss) Attributable to Noncontrolling Interest	1	1	2	2
Net Income (Loss) Attributable to Parent	$329	$341	$733	$477

Organization_and_Basis_of_Pres5

Organization and Basis of Presentation (Schedule of Excise Taxes) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	$101	$168	$416	$457
Duke Energy Carolinas [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	4	46	93	124
Progress Energy [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	63	89	214	230
Duke Energy Progress [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	'	33	56	88
Duke Energy Florida [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	63	56	158	142
Duke Energy Ohio [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	24	24	80	77
Duke Energy Indiana [Member]	'	'	'	'
Organization And Basis Of Presentation [Line Items]	'	'	'	'
Excise taxes collected	$10	$9	$29	$26

Acquisitions_and_Dispositions_1

Acquisitions and Dispositions (Narrative) (Details) (USD $)	9 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2016
			Scenario Forecast [Member]	Scenario Forecast [Member]
			Duke Energy Ohio [Member]	Duke Energy Progress [Member]
			Midwest Generation Business [Member]	NCEMPA Generating Assets [Member]
Significant Acquisitions and Disposals [Line Items]	'	'	'	'
Payments to acquire businesses	$16,000,000	'	'	$1,200,000,000
Disposal Group, Including Discontinued Operation, Consideration	'	'	$2,800,000,000	'

Acquisitions_and_Dispositions_2

Acquisitions and Dispositions (Plants in Disposal Group) (Details) (Duke Energy Ohio [Member])	9 Months Ended
	Sep. 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],[3]
Owned Average MW Capacity	622	[1],[3]
Ownership Interest	46.50%	[3]
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],[3]
Owned Average MW Capacity	653	[1],[3]
Ownership Interest	64.00%	[3]
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]	Station is not operated by Duke Energy Ohio.
[3]	Jointly owned with Ohio Power Company and/or The Dayton Power & Light Company.

Acquisitions_and_Dispositions_3

Acquisitions and Dispositions (Assets Held For Sale) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]	'	'	'	'	'
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$378	$62	($578)	$82	'
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]	'	'	'	'	'
Current assets	335	'	335	'	'
Current liabilities	284	'	284	'	7
Duke Energy Ohio [Member]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]	'	'	'	'	'
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	413	35	-597	39	'
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]	'	'	'	'	'
Current assets	284	'	284	'	'
Current liabilities	269	'	269	'	'
Midwest Generation Business [Member]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Revenue	620	491	1,233	1,369	'
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	460	'	-847	0	'
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	623	82	-864	126	'
Discontinued Operation, Tax Effect of Discontinued Operation	218	34	-321	43	'
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	405	48	-543	83	'
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]	'	'	'	'	'
Current assets	335	'	335	'	'
Investments and other assets	43	'	43	'	'
Property, plant and equipment	2,675	'	2,675	'	'
Total assets held for sale	3,053	'	3,053	'	'
Current liabilities	284	'	284	'	'
Deferred credits and other liabilities	57	'	57	'	'
Total liabilities associated with assets held for sale	341	'	341	'	'
Midwest Generation Business [Member] | Duke Energy Ohio [Member]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Revenue	536	389	853	1,054	'
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	466	'	-878	'	'
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	647	65	-917	71	'
Discontinued Operation, Tax Effect of Discontinued Operation	234	30	-320	32	'
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]	'	'	'	'	'
Current assets	284	'	284	'	'
Investments and other assets	38	'	38	'	'
Property, plant and equipment	2,644	'	2,644	'	'
Total assets held for sale	2,966	'	2,966	'	'
Current liabilities	269	'	269	'	'
Deferred credits and other liabilities	57	'	57	'	'
Total liabilities associated with assets held for sale	326	'	326	'	'
Other Disposal Groups [Member]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]	'	'	'	'	'
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	($27)	$14	($35)	($1)	'

Business_Segments_Narrative_De

Business Segments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	$405	$378	$1,212	$1,125
Progress Energy [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	166	162	502	520
Duke Energy Ohio [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	20	14	60	47
Other [Member] | Progress Energy [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest Expense	$58	$64	$181	$235
National Methanol Company [Member] | International Energy [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Equity Method Investment, Ownership Percentage	25.00%	'	25.00%	'

Business_Segments_Business_Seg

Business Segments (Business Segment Data) (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	$6,395		$6,217		$18,366		$17,132		'
Segment income	888		942		2,356		1,890		'
Add back noncontrolling interests component	3		4		11		12		'
Income (Loss) From Discontinued Operations, net of tax	378		62		-578		82		'
Net Income (Loss) Attributable to Parent	1,274		1,004		1,786		1,977		'
Net income (loss)	1,269		1,008		1,789		1,984		'
Segment assets	119,656		'		119,656		'		114,779
Impairment charges	1		2		81		388		'
Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,975		5,768	[1]	17,041		15,731	[1],[2],[3],[4]	'
Segment income	920		923	[1]	2,346		1,932	[1],[2],[3],[4],[5]	'
International Energy [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	366		370		1,111		1,168		'
Segment income	80		116		356		300		'
Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	50		56		195		184		'
Segment income	-17		-28		-70	[6]	-54		'
Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	4		23		19		49		'
Segment income	-92	[7]	-64	[7]	-269	[7]	-278	[7]	'
Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	6,391		6,194		18,347		17,083		'
Segment income	983		1,011		2,632		2,178		'
Operating Segments [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	5,986		5,786		17,074		15,766		'
Segment assets	105,172		'		105,172		'		'
Operating Segments [Member] | International Energy [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	366		370		1,111		1,168		'
Segment assets	5,159		'		5,159		'		'
Operating Segments [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	50		58		195		189		'
Segment assets	6,196		'		6,196		'		'
Operating Segments [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	6,402		6,214		18,380		17,123		'
Segment assets	116,527		'		116,527		'		'
Intersegment Eliminations [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-32		-44		-93		-104		'
Segment income	-3		-5		-7		-10		'
Segment assets	-185		'		-185		'		'
Intersegment Eliminations [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-11		-18		-33		-35		'
Intersegment Eliminations [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	'		-2		'		-5		'
Intersegment Eliminations [Member] | Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-21		-24		-60		-64		'
Intersegment Eliminations [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-11		-20		-33		-40		'
Corporate, Non-Segment [Member] | Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	25		47		79		113		'
Segment assets	2,944		'		2,944		'		'
Other VIEs [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Impairment charges	'		'		94		'		'
Duke Energy Ohio [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	446		438		1,433		1,349		'
Segment income	26		24		39		57		'
Income (Loss) From Discontinued Operations, net of tax	413		35		-597		39		'
Net Income (Loss) Attributable to Parent	439		59		-558		96		'
Segment assets	10,072		'		10,072		'		10,763
Impairment charges	'		'		94		'		'
Duke Energy Ohio [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	440		421		1,416		1,317		'
Segment income	43		42		151		122		'
Duke Energy Ohio [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	6		17		17		32		'
Segment income	-13		-13		-101	[8]	-51		'
Duke Energy Ohio [Member] | Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Segment income	-4		-5		-11		-14		'
Duke Energy Ohio [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	446		438		1,433		1,349		'
Segment income	30		29		50		71		'
Duke Energy Ohio [Member] | Operating Segments [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	441		421		1,417		1,317		'
Segment assets	7,297		'		7,297		'		'
Duke Energy Ohio [Member] | Operating Segments [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	6		17		17		32		'
Segment assets	3,266		'		3,266		'		'
Duke Energy Ohio [Member] | Operating Segments [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	447		438		1,434		1,349		'
Segment assets	10,563		'		10,563		'		'
Duke Energy Ohio [Member] | Intersegment Eliminations [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-1		'		-1		'		'
Segment assets	-622		'		-622		'		'
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] | Regulated Utilities [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-1		'		-1		'		'
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] | Total Reportable Segments [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Operating revenues	-1		'		-1		'		'
Duke Energy Ohio [Member] | Corporate, Non-Segment [Member] | Other [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Segment assets	131		'		131		'		'
Duke Energy Ohio [Member] | Other VIEs [Member] | Commercial Power [Member]	'		'		'		'		'
Segment Reporting Information, Profit (Loss) [Abstract]	'		'		'		'		'
Impairment charges	'		'		$94		'		'
[1]	In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
[2]	In June 2013, 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.
[3]	Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
[4]	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.
[5]	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 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.
[6]	Commercial Power recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
[7]	Other includes costs to achieve the Progress Energy merger.
[8]	Duke Energy Ohio recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.

Business_Segments_Net_Loss_Det

Business Segments (Net Loss) (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	$888		$942		$2,356		$1,890
Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-92	[1]	-64	[1]	-269	[1]	-278	[1]
Duke Energy Carolinas [Member] | Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-19		-26		-67		-69
Progress Energy [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	329		327		739		467
Progress Energy [Member] | Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-48		-72		-145		-205
Duke Energy Progress [Member] | Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-10		-20		-23		-40
Duke Energy Florida [Member] | Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	-5		-6		-16		-18
Duke Energy Indiana [Member] | Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Segment income	($3)		($5)		($10)		($13)
[1]	Other includes costs to achieve the Progress Energy merger.

Regulatory_Matters_Narrative_D

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

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 24, 2013

Sep. 24, 2013

Sep. 24, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

30-May-13

30-May-13

30-May-13

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Nov. 13, 2013

Nov. 13, 2013

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Aug. 18, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Atlantic Coast Pipeline [Member]

Atlantic Coast Pipeline [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 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 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]

Dominion Resources [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 Remediation [Member]

Natural Gas Rate Case [Member]

RTO Realignment [Member]

RTO Realignment [Member]

RTO Realignment [Member]

Regional Transmission Organization [Member]

W.C. Beckjord Station [Member]

Grid Infrastructure Improvement Plan [Member]

Edwardsport IGCC Plant [Member]

Edwardsport IGCC Plant [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]

gal

Edwardsport Event November 20, 2007 [Member]

Edwardsport Event December 27, 2012 [Member]

Edwardsport Event September 8, 2014 [Member]

Public Utilities, General Disclosures [Line Items]

'

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'

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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

'

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'

'

'

'

'

'

'

'

'

'

'

Approved percentage rate increase by state commission

'

'

'

'

'

'

'

'

'

'

'

4.50%

0.60%

'

'

'

'

'

'

'

'

4.50%

1.00%

'

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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

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'

'

'

'

'

'

Approved equity capital structure, percentage

'

'

'

'

'

'

'

'

'

'

53.00%

'

'

'

'

'

'

'

'

'

53.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint owner ownership percentage

'

'

'

'

'

40.00%

45.00%

'

'

'

'

'

'

'

13.00%

'

'

'

'

'

'

'

'

'

'

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'

'

'

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'

'

'

'

'

'

'

'

Impairment charges

1,000,000

2,000,000

81,000,000

388,000,000

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

-18,000,000

22,000,000

'

'

'

'

-18,000,000

22,000,000

'

1,000,000

1,000,000

2,000,000

346,000,000

'

'

'

'

'

'

'

295,000,000

'

'

65,000,000

'

'

'

'

'

94,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Regulatory assets, noncurrent

10,252,000,000

'

10,252,000,000

'

9,191,000,000

'

'

1,986,000,000

1,986,000,000

1,527,000,000

'

'

'

'

'

2,187,000,000

'

2,187,000,000

'

1,384,000,000

'

'

'

'

'

48,000,000

2,631,000,000

'

2,631,000,000

'

2,729,000,000

'

'

'

'

1,373,000,000

268,000,000

'

'

54,000,000

'

'

'

'

480,000,000

'

480,000,000

'

471,000,000

'

'

'

'

'

74,000,000

'

670,000,000

717,000,000

'

'

'

'

'

Regulatory assets, current

1,232,000,000

'

1,232,000,000

'

895,000,000

'

'

388,000,000

388,000,000

295,000,000

'

'

'

'

'

325,000,000

'

325,000,000

'

127,000,000

'

'

'

'

'

'

241,000,000

'

241,000,000

'

221,000,000

'

'

'

'

'

'

'

'

33,000,000

'

'

'

'

67,000,000

'

67,000,000

'

57,000,000

'

'

'

'

'

'

'

134,000,000

118,000,000

'

'

'

'

'

Amount of reduction to carrying amount of regulatory liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,000,000

95,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gallons of Fuel Released

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,000

'

'

'

'

'

'

'

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

'

Percent of AFUDC Allowed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

Net unrecovered investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

207,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring Reserve

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

95,000,000

95,000,000

'

'

'

'

'

'

'

'

'

Net property, plant and equipment

69,595,000,000

'

69,595,000,000

'

69,490,000,000

'

'

25,126,000,000

25,126,000,000

23,012,000,000

'

'

'

'

'

14,580,000,000

'

14,580,000,000

'

13,650,000,000

'

'

'

'

'

'

9,815,000,000

'

9,815,000,000

'

9,611,000,000

'

'

'

'

'

'

'

'

120,000,000

'

'

'

'

4,905,000,000

'

4,905,000,000

'

8,235,000,000

'

'

'

'

'

'

'

8,780,000,000

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

'

'

Allowance for Funds Used During Construction, Capitalized Interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

61,000,000

Estimated capital cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,900,000,000

'

'

'

'

Regulatory_Matters_Refunds_Det

Regulatory Matters (Refunds) (Details) (Duke Energy Florida [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Florida Public Service Commission Settlement Agreement 2012 [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	$288
Refunded to date	233
2014	35
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	449
2014	41
2015	'
2016	'
Total Customer Refunds [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	878
Refunded to date	682
2014	76
2015	50
2016	70
Accelerated Regulatory Asset Recovery [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	-130
Refunded to date	-28
2014	-9
2015	-37
2016	-56
Net Customer Refunds [Member]	'
Regulatory Assets Liabilities [Line Items]	'
Total	748
Refunded to date	654
2014	67
2015	13
2016	$14

Regulatory_Matters_Schedule_of

Regulatory Matters (Schedule of MISO Exit fees)(Details) (Duke Energy Ohio [Member], RTO Realignment [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Duke Energy Ohio [Member] | RTO Realignment [Member]	'
Restructuring Reserve [Roll Forward]	'
Balance, beginning of period	$95
Provision / Adjustments	3
Cash Reductions	-3
Balance, end of period	$95

Regulatory_Matters_Schedule_of1

Regulatory Matters (Schedule of Net Carrying Value Of Facilities As Well As the Remaining Non-current Regulatory Assets) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
	MW
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	2,297		'
Remaining net book value (in millions)	$69,595		$69,490
Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	256	[1]	'
Duke Energy Carolinas [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	200	[2]	'
Remaining net book value (in millions)	25,126		23,012
Duke Energy Carolinas [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	19	[1],[2]	'
Progress Energy [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	873		'
Remaining net book value (in millions)	24,399		23,382
Progress Energy [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	109	[1]	'
Duke Energy Florida [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	873	[3]	'
Remaining net book value (in millions)	9,815		9,611
Duke Energy Florida [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	109	[1],[3]	'
Duke Energy Ohio [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Capacity (in MW)	556	[4]	'
Remaining net book value (in millions)	4,905		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)	8,780		8,576
Duke Energy Indiana [Member] | Generation Facilities To Be Retired [Member]	'		'
Public Utilities, General Disclosures [Line Items]	'		'
Remaining net book value (in millions)	$119	[1],[5]	'
[1]	Included in Property, plant and equipment, net as of SeptemberB 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 and were retired October 1, 2014.
[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 $)

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

Sep. 30, 2014

Sep. 30, 2014

Feb. 21, 2014

Feb. 21, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Oct. 03, 2012

Dec. 31, 2009

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2014

Mar. 28, 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]

Progress Energy [Member]

Progress Energy [Member]

Progress Energy [Member]

Duke Energy Progress [Member]

Duke Energy Florida [Member]

Duke Energy Florida [Member]

Duke Energy Florida [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 [Member]

Minimum [Member]

Maximum [Member]

Claims

Malignant Asbestos Claim [Member]

Non Malignant Asbestos Claim [Member]

Dan River [Member]

Dan River [Member]

plant

Claims

Claims

gal

T

project

T

gal

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

'

'

'

'

'

'

'

'

'

'

'

'

Projects with Alleged NSR Violations

'

'

'

'

29

'

'

'

'

'

'

'

'

'

'

'

'

Number of Coal Plants with Alleged NSR Violations

'

'

'

'

25

'

'

'

'

'

'

'

'

'

'

'

'

Number of Retired Plants

'

'

'

'

11

'

'

'

'

'

'

'

'

'

'

'

'

Loss contingency, pending claims, number

'

'

'

'

13

'

'

23

61

'

'

'

'

'

'

'

'

Remaining Number of Coal Plants with Alleged NSR Violations

'

'

'

'

13

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos-related injuries and damages reserves

'

'

'

'

'

591,000,000

616,000,000

7,000,000

13,000,000

'

'

'

'

'

'

'

'

Reinsurance retention policy, amount retained

'

'

'

'

'

476,000,000

'

'

'

'

'

'

'

'

'

'

'

Reinsurance retention policy, excess retention, amount reinsured

'

'

'

'

'

864,000,000

'

'

'

'

'

'

'

'

'

'

'

Probable insurance recoveries

'

'

'

'

'

616,000,000

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

'

'

'

'

'

Gain (Loss) Related to Litigation Settlement

'

'

'

'

'

'

'

'

'

'

'

'

83,000,000

21,000,000

'

'

'

Loss contingency, damages sought, value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

510,000,000

'

'

Gain contingency, unrecorded amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$54,000,000

$560,000,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	$83	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	79	75
Provisions/Adjustments	34	6
Cash reductions	-8	-17
Ending balance	105	64
Duke Energy Carolinas [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	25	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	11	12
Provisions/Adjustments	-1	'
Cash reductions	'	'
Ending balance	10	12
Progress Energy [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	9	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	27	33
Provisions/Adjustments	4	5
Cash reductions	-6	-6
Ending balance	25	32
Duke Energy Progress [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	2	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	8	14
Provisions/Adjustments	3	1
Cash reductions	-4	-2
Ending balance	7	13
Duke Energy Florida [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	7	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	19	19
Provisions/Adjustments	1	4
Cash reductions	-2	-4
Ending balance	18	19
Duke Energy Ohio [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	42	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	27	15
Provisions/Adjustments	28	-1
Cash reductions	-1	-8
Ending balance	54	6
Duke Energy Indiana [Member]	'	'
Environmental Matters Details [Line Items]	'	'
Environmental Exit Costs, Reasonably Possible Additional Loss	7	'
Accrual for Environmental Loss Contingencies [Roll Forward]	'	'
Beginning balance	7	8
Provisions/Adjustments	3	1
Cash reductions	-1	-2
Ending balance	$9	$7

Commitments_and_Contingencies_3

Commitments and Contingencies (Schedule of Reserves) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	$227	$204
Progress Energy [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	70	78
Duke Energy Progress [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	9	10
Duke Energy Florida [Member]	'	'
Loss Contingencies [Line Items]	'	'
Reserves for legal matters	$41	$43

Debt_and_Credit_Facilities_Nar

Debt and Credit Facilities (Narrative) (Details) (USD $)	9 Months Ended
In Billions, unless otherwise specified	Sep. 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 $)

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

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

April 2014 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]

June 2014 11.870% Senior Unsecured Floating Notes Maturing May 2019 [Member]

June 2014 13.680% Senior Unsecured Floating Notes Maturing May 2021 [Member]

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

July 2014 5.340% Secured Debt Maturing July 2036 [Member]

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

March 2014 0.433% 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]

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 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]

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

March 2014 0.433% 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]

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-Jul-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-Jul-36

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%

11.87%

13.68%

0.85%

5.34%

4.38%

0.43%

'

'

3.75%

0.61%

'

4.38%

0.43%

'

0.85%

'

'

Debt issuances

$2,222,000,000

$600,000,000

[1]

$400,000,000

[1]

$108,000,000

[2]

$110,000,000

[2]

$225,000,000

[3]

$129,000,000

[4]

$400,000,000

[5]

$250,000,000

[5]

$1,000,000,000

$1,000,000,000

$600,000,000

[1]

$400,000,000

[1]

$650,000,000

$400,000,000

[5]

$250,000,000

[5]

$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 9 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.

[2]

Proceeds were used to repay $196 million of debt 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 13 for further details.

[4]

Proceeds were used to fund a portion of Duke Energy's prior investment in the existing Wind Star renewables portfolio.

[5]

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 $)	Sep. 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]
Commercial paper	-1,278	[2]
Outstanding letters of credit	-64
Tax exempt bonds	-116
Available capacity	4,542
Parent Company [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	2,250	[1]
Commercial paper	-784	[2]
Outstanding letters of credit	-56
Tax exempt bonds	0
Available capacity	1,410
Parent Company [Member] | Proceeds Loaned To Subsidiary Registrants [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Commercial paper	-450
Duke Energy Carolinas [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	1,000	[1]
Commercial paper	-300	[2]
Outstanding letters of credit	-4
Tax exempt bonds	-35
Available capacity	661
Duke Energy Progress [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	750	[1]
Commercial paper	-27
Outstanding letters of credit	-2
Tax exempt bonds	0
Available capacity	721
Duke Energy Florida [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	650	[1]
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]
Commercial paper	-4
Outstanding letters of credit	0
Tax exempt bonds	0
Available capacity	646
Duke Energy Indiana [Member] | Revolving Credit Facility [Member]	'
Line of Credit Facility [Line Items]	'
Facility size	700	[1]
Commercial paper	-163	[2]
Outstanding letters of credit	-1
Tax exempt bonds	-81
Available capacity	$455
[1]	Represents the sublimit of each borrower.
[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 Payable to Affiliated Companies in Duke Energy Carolinas' and Duke Energy Indianabs Condensed Consolidated Balance Sheets.

Debt_and_Credit_Facilities_Sum1

Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt)(Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
In Millions, unless otherwise specified			Other Debt Obligations [Member]	Duke Energy Progress [Member]	Duke Energy Progress [Member]	Duke Energy Progress [Member]	Parent Company [Member]	Duke Energy Ohio [Member]	Duke Energy Ohio [Member]	Duke Energy Ohio [Member]
						First Mortgage Bonds [Member]	Unsecured Debt [Member]			First Mortgage Bonds [Member]
						April 2015 Maturity 1 [Member]	April 2015 Maturity 1 [Member]			March 2015 [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'
Debt maturity date	'	'	'	'	'	30-Apr-15	30-Apr-15	'	'	31-Mar-15
Interest rate	'	'	'	'	'	5.15%	3.35%	'	'	0.37%
Current maturities of long-term debt	$1,156	$2,104	$256	$306	$174	$300	$450	$197	$47	$150

Asset_Retirement_Obligations_N

Asset Retirement Obligations (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Asset Retirement Obligations [Line Items]	'		'
Liabilities incurred in the current year	$3,433	[1]	'
Net property, plant and equipment	69,595		69,490
Regulatory assets, noncurrent	10,252		9,191
Regulatory liability, noncurrent	6,220		5,949
Duke Energy Carolinas [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Liabilities incurred in the current year	2,026	[1]	'
Net property, plant and equipment	25,126		23,012
Regulatory assets, noncurrent	1,986		1,527
Regulatory liability, noncurrent	2,690		2,576
Duke Energy Progress [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Liabilities incurred in the current year	1,406	[1]	'
Net property, plant and equipment	14,580		13,650
Regulatory assets, noncurrent	2,187		1,384
Regulatory liability, noncurrent	1,796		1,673
North Carolina Ash Basins [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Number of Ash Basins	32		'
Number of Plants with Ash Basins	14		'
North Carolina Ash Basins [Member] | Duke Energy Carolinas [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Net property, plant and equipment	1,559		'
Regulatory assets, noncurrent	467		'
North Carolina Ash Basins [Member] | Duke Energy Progress [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Net property, plant and equipment	610		'
Regulatory assets, noncurrent	763		'
Removal Costs [Member] | North Carolina Ash Basins [Member] | Duke Energy Progress [Member]	'		'
Asset Retirement Obligations [Line Items]	'		'
Regulatory liability, noncurrent	$33		'
[1]	Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.

Asset_Retirement_Obligations_A

Asset Retirement Obligations (ARO Rollforward) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]	'
Balance at beginning of period	$4,958	[1],[2]
Accretion expense	164	[3]
Liabilities settled	-56
Liabilities incurred in the current year	3,433	[4]
Balance at end of period	8,499
Duke Energy Carolinas [Member]	'
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]	'
Balance at beginning of period	1,594
Accretion expense	71	[3]
Liabilities settled	'
Liabilities incurred in the current year	2,026	[4]
Balance at end of period	3,691
Progress Energy [Member]	'
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]	'
Balance at beginning of period	2,570	[2]
Accretion expense	91	[3]
Liabilities settled	-52
Liabilities incurred in the current year	1,406	[4]
Balance at end of period	4,015
Duke Energy Progress [Member]	'
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]	'
Balance at beginning of period	1,737	[2]
Accretion expense	63	[3]
Liabilities settled	'
Liabilities incurred in the current year	1,406	[4]
Balance at end of period	3,206
Asset retirement obligation, current	$8
[1]	The balance as of DecemberB 31, 2013 primarily relates to decommissioning nuclear power facilities, asbestos removal and closure of landfills at fossil generation facilities.
[2]	The balance at DecemberB 31, 2013 includes $8 million reported in Other current liabilities on the Condensed Consolidated Balance Sheets at Duke Energy, Progress Energy and Duke Energy Progress.
[3]	Substantially all accretion expense for the nine months ended SeptemberB 30, 2014 relates to Duke Energy's regulated electric operations from previously established asset retirement obligations and has been deferred in accordance with regulatory accounting treatment.
[4]	Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.

Goodwill_Details

Goodwill (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Goodwill [Roll Forward]	'	'
Goodwill	$17,202	$17,211
Accumulated impairment charges	-871	-871
Foreign exchange and other changes	-9	'
Goodwill as adjusted for accumulated impairment charges	16,331	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	317	326
Accumulated impairment charges	'	'
Foreign exchange and other changes	-9	'
Goodwill as adjusted for accumulated impairment charges	317	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				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 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	$199	[1]	$236	[1]	$638	[1]	$714	[1]
Duke Energy Carolinas [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	5	[2]	5	[2]	16	[2]	16	[2]
Duke Energy Carolinas [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	13	[3]	24	[3]	125	[3]	101	[3]
Related party transaction, expenses from transactions with related party	36	[3]	39	[3]	127	[3]	71	[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]	24	[4]	'	[4]	74	[4]
Related party transaction, expenses from transactions with related party	182	[1]	54	[1]	560	[1]	327	[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]	25	[2]	26	[2]
Progress Energy [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	36	[3]	39	[3]	127	[3]	71	[3]
Related party transaction, expenses from transactions with related party	13	[3]	24	[3]	125	[3]	101	[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	91	[1]	33	[1]	291	[1]	195	[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]	13	[2]	15	[2]
Duke Energy Progress [Member] | Joint Dispatch Agreement [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, other revenues from transactions with related party	36	[3]	39	[3]	127	[3]	71	[3]
Related party transaction, expenses from transactions with related party	13	[3]	24	[3]	125	[3]	101	[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	91	[1]	20	[1]	269	[1]	131	[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]	12	[2]	11	[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	83	[1]	89	[1]	242	[1]	261	[1]
Duke Energy Ohio [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	3	[2]	3	[2]	10	[2]	11	[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]	113	[1]	293	[1]	313	[1]
Duke Energy Indiana [Member] | Indemnification Coverages [Member]	'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'
Related party transaction, expenses from transactions with related party	$3	[2]	$5	[2]	$8	[2]	$10	[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]	Duke Energy Carolinas and Duke Energy participate in a JDA which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power 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 nine months ended SeptemberB 30, 2014.

Related_Party_Transactions_Nar

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

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Apr. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

DECAM [Member]

Parent Company [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Duke Energy Ohio [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

April 2014 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]

April 2014 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]

DECAM [Member]

DECAM [Member]

Parent Company [Member]

Duke Energy Ohio [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Parent Company [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Intercompany loan payable

'

'

'

$563,000,000

$43,000,000

$550,000,000

$43,000,000

'

'

'

'

Debt issuances

2,222,000,000

'

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 9 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 $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Derivative [Line Items]	'
Undesignated commodity contracts latest expiration year	'2018
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$9

Derivatives_and_Hedging_Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details)	9 Months Ended		12 Months Ended
	Sep. 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)	29,569	[1]	71,466	[1]
Natural gas (millions of decatherms)	659,000,000		636,000,000
Duke Energy Carolinas [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	'	[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)	'	[1]	925	[1]
Natural gas (millions of decatherms)	319,000,000		363,000,000
Duke Energy Progress [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	'	[1]	925	[1]
Natural gas (millions of decatherms)	117,000,000		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)	202,000,000		222,000,000
Duke Energy Ohio [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	25,680	[1]	69,362	[1]
Natural gas (millions of decatherms)	340,000,000		274,000,000
Duke Energy Indiana [Member]	'		'
Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value [Abstract]	'		'
Electricity-energy (Gigawatt-hours)	607	[1]	203	[1]
Natural gas (millions of decatherms)	'		'
[1]	Amounts at Duke Energy Ohio include intercompany positions that eliminate at Duke Energy.

Derivatives_and_Hedging_Intere

Derivatives and Hedging (Interest Rate Risk) (Details) (Interest Rate Contracts [Member], USD $)	Sep. 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	798
Duke Energy Ohio [Member]	'	'
Derivative [Line Items]	'	'
Notional amount	27	27
Duke Energy Ohio [Member] | Cash Flow Hedging [Member]	'	'
Derivative [Line Items]	'	'
Notional amount	'	'
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

Derivatives_and_Hedging_Locati

Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	$570	$461
Location and fair value amounts of derivatives (Liability)	913	636
Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	388	214
Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	175	233
Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	583	322
Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	314	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)	38	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)	14	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)	23	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)	554	434
Location and fair value amounts of derivatives (Liability)	875	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)	36	201
Location and fair value amounts of derivatives (Liability)	'	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)	2	'
Location and fair value amounts of derivatives (Liability)	2	'
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)	9	215
Location and fair value amounts of derivatives (Liability)	'	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)	9	'
Location and fair value amounts of derivatives (Liability)	2	'
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)	4	13
Location and fair value amounts of derivatives (Liability)	123	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)	346	'
Location and fair value amounts of derivatives (Liability)	445	'
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)	'	5
Location and fair value amounts of derivatives (Liability)	37	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)	148	'
Location and fair value amounts of derivatives (Liability)	260	'
Progress Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	20
Location and fair value amounts of derivatives (Liability)	144	204
Progress Energy [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	15
Progress Energy [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	5
Progress Energy [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	115	107
Progress Energy [Member] | Deferred Credits And Other Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	29	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)	2	20
Location and fair value amounts of derivatives (Liability)	144	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)	'	3
Location and fair value amounts of derivatives (Liability)	'	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
Location and fair value amounts of derivatives (Liability)	'	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)	1	11
Location and fair value amounts of derivatives (Liability)	115	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)	1	4
Location and fair value amounts of derivatives (Liability)	29	91
Duke Energy Progress [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	3	6
Location and fair value amounts of derivatives (Liability)	48	71
Duke Energy Progress [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	3
Duke Energy Progress [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	3
Duke Energy Progress [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	40	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)	8	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)	3	6
Location and fair value amounts of derivatives (Liability)	47	70
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)	'	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)	2	2
Location and fair value amounts of derivatives (Liability)	39	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)	8	29
Duke Energy Florida [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	2	14
Location and fair value amounts of derivatives (Liability)	96	129
Duke Energy Florida [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	12
Duke Energy Florida [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	1	2
Duke Energy Florida [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	75	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)	21	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)	'	3
Location and fair value amounts of derivatives (Liability)	'	2
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)	1	9
Location and fair value amounts of derivatives (Liability)	75	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)	1	2
Location and fair value amounts of derivatives (Liability)	21	63
Duke Energy Ohio [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	564	391
Location and fair value amounts of derivatives (Liability)	778	390
Duke Energy Ohio [Member] | Current Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	381	186
Duke Energy Ohio [Member] | Investments And Other Assets, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	183	205
Duke Energy Ohio [Member] | Current Liabilities, Other [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Liability)	485	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)	293	186
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Location and fair value amounts of derivatives (Asset)	564	391
Location and fair value amounts of derivatives (Liability)	778	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
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)	4	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)	2	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)	1	'
Location and fair value amounts of derivatives (Liability)	1	'
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)	9	'
Location and fair value amounts of derivatives (Liability)	2	'
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)	378	'
Location and fair value amounts of derivatives (Liability)	484	'
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)	174	'
Location and fair value amounts of derivatives (Liability)	$287	'

Derivatives_and_Hedging_Schedu

Derivatives and Hedging (Schedule of Offsetting Assets and Liabilities: Derivatives and Collateral Posted) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	$913	$636
Net amounts recognized on the Condensed Consolidated Balance Sheet	428	321
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	570	461
Net amounts recognized on the Condensed Consolidated Balance Sheet	85	145
Current Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	388	214
Gross amounts offset	-362	-179
Net amount subject to master netting	26	35
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	26	35
Investments And Other Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	175	233
Gross amounts offset	-127	-138
Net amount subject to master netting	48	95
Amounts not subject to master netting	7	14
Net amounts recognized on the Condensed Consolidated Balance Sheet	55	109
Other Current Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	583	322
Gross amounts offset	-402	-192
Net amounts subject to master netting	181	130
Amounts not subject to master netting	3	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	184	134
Other Noncurrent Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	314	299
Gross amounts offset	-203	-155
Net amounts subject to master netting	111	144
Amounts not subject to master netting	13	11
Net amounts recognized on the Condensed Consolidated Balance Sheet	124	155
Progress Energy [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	144	204
Net amounts recognized on the Condensed Consolidated Balance Sheet	142	187
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	2	20
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	3
Progress Energy [Member] | Current Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	1	15
Gross amounts offset	-1	-13
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	2
Progress Energy [Member] | Investments And Other Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	1	5
Gross amounts offset	-1	-4
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	1
Progress Energy [Member] | Other Current Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	115	107
Gross amounts offset	-1	-17
Net amounts subject to master netting	114	90
Amounts not subject to master netting	'	'
Net amounts recognized on the Condensed Consolidated Balance Sheet	114	90
Progress Energy [Member] | Other Noncurrent Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	29	93
Gross amounts offset	-1	-10
Net amounts subject to master netting	28	83
Amounts not subject to master netting	'	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	28	87
Duke Energy Progress [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	48	71
Net amounts recognized on the Condensed Consolidated Balance Sheet	45	66
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	3	6
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	1
Duke Energy Progress [Member] | Current Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	2	3
Gross amounts offset	-2	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	'
Duke Energy Progress [Member] | Investments And Other Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	1	3
Gross amounts offset	-1	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	'
Duke Energy Progress [Member] | Other Current Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	40	41
Gross amounts offset	-2	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	38	38
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	8	30
Gross amounts offset	-1	-3
Net amounts recognized on the Condensed Consolidated Balance Sheet	7	27
Duke Energy Florida [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	96	129
Net amounts recognized on the Condensed Consolidated Balance Sheet	97	116
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	2	14
Net amounts recognized on the Condensed Consolidated Balance Sheet	3	1
Duke Energy Florida [Member] | Current Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	1	12
Gross amounts offset	-1	-10
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	2
Duke Energy Florida [Member] | Investments And Other Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	1	2
Gross amounts offset	-1	-2
Net amounts recognized on the Condensed Consolidated Balance Sheet	'	'
Duke Energy Florida [Member] | Other Current Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	75	66
Gross amounts offset	-1	-15
Net amounts recognized on the Condensed Consolidated Balance Sheet	74	51
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	21	63
Gross amounts offset	-1	-7
Net amounts recognized on the Condensed Consolidated Balance Sheet	20	56
Duke Energy Ohio [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	778	390
Net amounts recognized on the Condensed Consolidated Balance Sheet	221	95
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	564	391
Net amounts recognized on the Condensed Consolidated Balance Sheet	7	96
Duke Energy Ohio [Member] | Current Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	381	186
Gross amounts offset	-377	-165
Net amounts recognized on the Condensed Consolidated Balance Sheet	4	21
Duke Energy Ohio [Member] | Investments And Other Assets, Other [Member]	'	'
Offsetting Derivative Assets [Abstract]	'	'
Gross amounts recognized	183	205
Gross amounts offset	-177	-132
Net amounts recognized on the Condensed Consolidated Balance Sheet	6	73
Duke Energy Ohio [Member] | Other Current Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	485	199
Gross amounts offset	-419	-173
Net amounts subject to master netting	66	26
Amounts not subject to master netting	'	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	66	27
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member]	'	'
Offsetting Derivative Liabilities [Abstract]	'	'
Gross amounts recognized	293	186
Gross amounts offset	-251	-143
Net amounts subject to master netting	42	43
Amounts not subject to master netting	'	4
Net amounts recognized on the Condensed Consolidated Balance Sheet	$42	$47

Derivatives_and_Hedging_Cash_F

Derivatives and Hedging (Cash Flow Hedges - Location and Amount of Pretax Recognized in Comprehensive Income) (Details) (Designated As Hedging Instrument [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Pretax Gains (Losses) Recorded in AOCI	($6)	'	($15)	$72
Interest Rate Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax Gains (Losses) Recorded in AOCI, interest rate contracts	-6	'	-15	71
Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	-2	'	-7	-2
Commodity Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax Gains (Losses) Recorded in AOCI, interest rate contracts	'	'	'	'
Pretax Gains (Losses) Recorded in AOCI, commodity contracts	'	'	'	$1

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		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	($278)	($78)	($807)	($195)
Pretax gains (losses) recognized as regulatory assets or liabilities	-15	-11	27	27
Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	3	-29	2	-34
Commodity Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	1	6	'	10
Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	'	3	'	10
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	'	-7	'	-7
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	32	-68	18	-157
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	'	-2	'	'
Commodity Contracts [Member] | Income (loss) from Discontinued Operations [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-319	'	-825	-28
Interest Rate Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-7	12	9	51
Interest Rate Contracts [Member] | Regulatory Liability [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	-12	'	16	'
Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	9	-4	'	-13
Progress Energy [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	33	-69	18	-160
Pretax gains (losses) recognized as regulatory assets or liabilities	3	-27	19	-21
Progress Energy [Member] | Commodity Contracts [Member] | Regulatory Asset [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized as regulatory assets or liabilities	3	-31	19	-34
Progress Energy [Member] | Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	1	3	'	10
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	32	-68	18	-157
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	'	4	'	13
Progress Energy [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - interest	'	-4	'	-13
Duke Energy Progress [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	14	-24	4	-52
Pretax gains (losses) recognized as regulatory assets or liabilities	-19	-8	21	-8
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	-19	-11	21	-18
Duke Energy Progress [Member] | Commodity Contracts [Member] | Revenue Regulated Electric [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	1	3	'	10
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	13	-24	4	-53
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	'	10
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	'	-9
Duke Energy Florida [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	20	-46	14	-108
Pretax gains (losses) recognized as regulatory assets or liabilities	22	-18	-2	-13
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	22	-19	-2	-16
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	20	-45	14	-105
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	'	3
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	'	-3
Duke Energy Ohio [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings	-303	3	-888	-29
Pretax gains (losses) recognized as regulatory assets or liabilities	'	'	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] | Income (loss) from Discontinued Operations [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Pretax gains (losses) recognized in earnings - commodities	-303	3	-887	-28
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	'	'	'	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	'
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)

Derivatives_and_Hedging_Deriva

Derivatives and Hedging (Derivative Instruments That Contain Credit-Risk Related Contingent Features and Cash Collateral) (Details) (USD $)	Sep. 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	$688	$525
Fair value of collateral already posted	202	135
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	86	205
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	116	30
Derivative, collateral, right to reclaim cash - not offset against net derivative	86	122
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	107	168
Fair value of collateral already posted	'	10
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	107	158
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	'	10
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	38	60
Fair value of collateral already posted	'	'
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	38	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	69	108
Fair value of collateral already posted	'	10
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	69	98
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	'	10
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	688	355
Fair value of collateral already posted	202	125
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	86	47
Information Regarding Cash Collateral Under Master Netting Arrangements	'	'
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	116	19
Derivative, collateral, right to reclaim cash - not offset against net derivative	$86	$115

Investments_in_Debt_and_Equity2

Investments in Debt and Equity Securities (Narrative) (Details) (USD $)	Sep. 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 $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	$2,011		$1,884
Gross Unrealized Holding Losses	42		47
Estimated Fair Value	5,747		5,551
Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,973		1,852
Gross Unrealized Holding Losses	37		36
Estimated Fair Value	5,374		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	74		110
Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,943		1,813
Gross Unrealized Holding Losses	28		10
Estimated Fair Value	3,825		3,579
Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	13		8
Gross Unrealized Holding Losses	3		6
Estimated Fair Value	493		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	132		160
Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	12		7
Gross Unrealized Holding Losses	4		12
Estimated Fair Value	713		730
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	137		154
Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	38	[1]	32	[1]
Gross Unrealized Holding Losses	5	[1]	11	[1]
Estimated Fair Value	373	[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	16		21
Other Classification [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	32		29
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	95		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	68		99
Other Classification [Member] | Municipal Bonds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	3		2
Gross Unrealized Holding Losses	'		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	16		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	5		8
Estimated Fair Value	96		111
Duke Energy Carolinas [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,058		1,004
Gross Unrealized Holding Losses	24		23
Estimated Fair Value	2,972		2,837
Duke Energy Carolinas [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,058		1,004
Gross Unrealized Holding Losses	23		22
Estimated Fair Value	2,969		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	39		42
Duke Energy Carolinas [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	1,046		974
Gross Unrealized Holding Losses	17		6
Estimated Fair Value	2,124		1,964
Duke Energy Carolinas [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	7		5
Gross Unrealized Holding Losses	3		5
Estimated Fair Value	345		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	22		54
Duke Energy Carolinas [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	4		3
Gross Unrealized Holding Losses	2		7
Estimated Fair Value	317		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	122		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	918		849
Gross Unrealized Holding Losses	14		14
Estimated Fair Value	2,463		2,358
Progress Energy [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	915		848
Gross Unrealized Holding Losses	14		14
Estimated Fair Value	2,405		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	35		68
Progress Energy [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	897		839
Gross Unrealized Holding Losses	11		4
Estimated Fair Value	1,701		1,615
Progress Energy [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	6		3
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	148		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	110		106
Progress Energy [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	8		4
Gross Unrealized Holding Losses	2		5
Estimated Fair Value	396		376
Progress Energy [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	15		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	'	[1]	'	[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	15		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	43		39
Duke Energy Progress [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	588		544
Gross Unrealized Holding Losses	10		11
Estimated Fair Value	1,625		1,540
Duke Energy Progress [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	588		544
Gross Unrealized Holding Losses	10		11
Estimated Fair Value	1,623		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	28		48
Duke Energy Progress [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	574		535
Gross Unrealized Holding Losses	7		3
Estimated Fair Value	1,127		1,069
Duke Energy Progress [Member] | Ndtf [Member] | Corporate Debt Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	4		3
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	95		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	108		104
Duke Energy Progress [Member] | Ndtf [Member] | US Treasury and Government [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	6		4
Gross Unrealized Holding Losses	2		3
Estimated Fair Value	257		232
Duke Energy Progress [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	8		5
Duke Energy Progress [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	'	[1]	'	[1]
Gross Unrealized Holding Losses	'	[1]	'	[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	330		305
Gross Unrealized Holding Losses	4		3
Estimated Fair Value	825		803
Duke Energy Florida [Member] | Ndtf [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	327		304
Gross Unrealized Holding Losses	4		3
Estimated Fair Value	782		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	7		20
Duke Energy Florida [Member] | Ndtf [Member] | Equity Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	323		304
Gross Unrealized Holding Losses	4		1
Estimated Fair Value	574		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	53		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	139		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	'	[1]	'	[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	'		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	43		39
Duke Energy Indiana [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	26		24
Gross Unrealized Holding Losses	'		1
Estimated Fair Value	99		94
Duke Energy Indiana [Member] | Other Classification [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Gross Unrealized Holding Gains	26	[1]	24	[1]
Gross Unrealized Holding Losses	'	[1]	1	[1]
Estimated Fair Value	99	[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	26		24
Gross Unrealized Holding Losses	'		'
Estimated Fair Value	68		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
Estimated Fair Value	$30		$28
[1]	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 $)	Sep. 30, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'
Due in one year or less	$33
Due after one through five years	452
Due after five through 10 years	457
Due after 10 years	795
Total	1,737
Duke Energy Carolinas [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	2
Due after one through five years	171
Due after five through 10 years	256
Due after 10 years	380
Total	809
Progress Energy [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	21
Due after one through five years	218
Due after five through 10 years	145
Due after 10 years	328
Total	712
Duke Energy Progress [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	10
Due after one through five years	147
Due after five through 10 years	94
Due after 10 years	217
Total	468
Duke Energy Florida [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	11
Due after one through five years	71
Due after five through 10 years	51
Due after 10 years	111
Total	244
Duke Energy Indiana [Member]	'
Debt Instrument [Line Items]	'
Due in one year or less	1
Due after one through five years	18
Due after five through 10 years	8
Due after 10 years	3
Total	$30

Investments_in_Debt_and_Equity5

Investments in Debt and Equity Securities (Realized Gains and Losses)(Details) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	$28	$72	$90	$135
Realized losses	51	16	57	38
Duke Energy Carolinas [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	20	49	72	95
Realized losses	48	1	50	11
Progress Energy [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	8	22	17	37
Realized losses	3	11	6	20
Duke Energy Progress [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	4	7	11	15
Realized losses	2	2	4	6
Duke Energy Florida [Member]	'	'	'	'
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'	'	'
Realized gains	3	14	5	22
Realized losses	$1	$9	$2	$13

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	$85	$145
Assets, fair value disclosure	5,839	5,712
Derivative liabilities	-428	-321
Net assets, fair value	5,411	5,391
Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	6	33
Assets, fair value disclosure	4,170	4,057
Derivative liabilities	-119	11
Net assets, fair value	4,051	4,068
Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	45	70
Assets, fair value disclosure	1,448	1,515
Derivative liabilities	-253	-303
Net assets, fair value	1,195	1,212
Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	34	42
Assets, fair value disclosure	221	140
Derivative liabilities	-56	-29
Net assets, fair value	165	111
Equity Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3,824	3,579
Equity Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3,649	3,495
Equity Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3	57
Equity Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	172	27
Equity Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	96	102
Equity Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	96	91
Equity Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	11
Equity Securities [Member] | Other Classification [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Debt Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,550	1,553
Debt Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	388	402
Debt Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,162	1,100
Debt Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	51
Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	284	333
Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	31	36
Debt Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	238	277
Debt Securities [Member] | Other Classification [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	15	20
Duke Energy Carolinas [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	'	2,837
Derivative liabilities	'	-2
Net assets, fair value	2,972	2,835
Duke Energy Carolinas [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	'	2,047
Derivative liabilities	'	'
Net assets, fair value	2,099	2,047
Duke Energy Carolinas [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Assets, fair value disclosure	'	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	'	81
Derivative liabilities	'	-2
Net assets, fair value	175	79
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2,124	1,964
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,949	1,879
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	3	58
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	172	27
Duke Energy Carolinas [Member] | Debt Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	845	870
Duke Energy Carolinas [Member] | Debt Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	150	168
Duke Energy Carolinas [Member] | Debt Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	695	651
Duke Energy Carolinas [Member] | Debt Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	51
Duke Energy Carolinas [Member] | Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	3
Duke Energy Carolinas [Member] | Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Carolinas [Member] | Debt Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Carolinas [Member] | Debt Securities [Member] | Other Classification [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
Assets, fair value disclosure	2,463	2,353
Derivative liabilities	-142	-187
Net assets, fair value	2,321	2,166
Progress Energy [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	'
Assets, fair value disclosure	1,953	1,867
Derivative liabilities	'	'
Net assets, fair value	1,953	1,867
Progress Energy [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	3
Assets, fair value disclosure	510	486
Derivative liabilities	-142	-187
Net assets, fair value	368	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] | Equity Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,700	1,615
Progress Energy [Member] | Equity Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,700	1,615
Progress Energy [Member] | Equity Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | Equity Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | Debt Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	705	677
Progress Energy [Member] | Debt Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	238	233
Progress Energy [Member] | Debt Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	467	444
Progress Energy [Member] | Debt Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Progress Energy [Member] | Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	58	58
Progress Energy [Member] | Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	15	19
Progress Energy [Member] | Debt Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	43	39
Progress Energy [Member] | Debt Securities [Member] | Other Classification [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
Assets, fair value disclosure	1,625	1,543
Derivative liabilities	-45	-66
Net assets, fair value	1,580	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	1,283	1,209
Derivative liabilities	'	'
Net assets, fair value	1,283	1,209
Duke Energy Progress [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	1
Assets, fair value disclosure	342	334
Derivative liabilities	-45	-66
Net assets, fair value	297	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] | Equity Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,126	1,069
Duke Energy Progress [Member] | Equity Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	1,126	1,069
Duke Energy Progress [Member] | Equity Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Equity Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Debt Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	497	470
Duke Energy Progress [Member] | Debt Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	155	137
Duke Energy Progress [Member] | Debt Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	342	333
Duke Energy Progress [Member] | Debt Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	3
Duke Energy Progress [Member] | Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	2	3
Duke Energy Progress [Member] | Debt Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Progress [Member] | Debt Securities [Member] | Other Classification [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	3	1
Assets, fair value disclosure	828	801
Derivative liabilities	-97	-116
Net assets, fair value	731	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	3	1
Assets, fair value disclosure	171	157
Derivative liabilities	-97	-116
Net assets, fair value	74	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] | Equity Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	574	546
Duke Energy Florida [Member] | Equity Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	574	546
Duke Energy Florida [Member] | Equity Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | Equity Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | Debt Securities [Member] | Ndtf [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	208	214
Duke Energy Florida [Member] | Debt Securities [Member] | Ndtf [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	83	96
Duke Energy Florida [Member] | Debt Securities [Member] | Ndtf [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	125	118
Duke Energy Florida [Member] | Debt Securities [Member] | Ndtf [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	'
Duke Energy Florida [Member] | Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	43	40
Duke Energy Florida [Member] | Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	'	2
Duke Energy Florida [Member] | Debt Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Investments	43	38
Duke Energy Florida [Member] | Debt Securities [Member] | Other Classification [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	7	96
Derivative liabilities	-221	-95
Net assets, fair value	-214	1
Duke Energy Ohio [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	'	50
Derivative liabilities	-114	-1
Net assets, fair value	-114	49
Duke Energy Ohio [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	3	21
Derivative liabilities	-48	-65
Net assets, fair value	-45	-44
Duke Energy Ohio [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	4	25
Derivative liabilities	-59	-29
Net assets, fair value	-55	-4
Duke Energy Indiana [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	23	12
Net assets, fair value	122	106
Duke Energy Indiana [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative assets	1	'
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	22	12
Net assets, fair value	22	12
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	69	65
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	69	65
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member] | Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	'	'
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale equity securities	'	'
Duke Energy Indiana [Member] | Debt Securities [Member] | Other Classification [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	30	29
Duke Energy Indiana [Member] | Debt Securities [Member] | Other Classification [Member] | Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale debt securities	'	'
Duke Energy Indiana [Member] | Debt Securities [Member] | Other Classification [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] | Debt Securities [Member] | Other Classification [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		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments	'	'	'	'
Beginning balance	$210	$10	$111	$13
Total pretax gains (losses) included in earnings	-33	13	-21	-8
Total pretax gains (losses) included in comprehensive income	'	1	'	-1
Purchases	12	2	79	26
Sales	-13	-2	-15	-5
Issuances	1	4	'	9
Settlements	'	-5	-45	-8
Transfers in and/or out of level 3	-1	34	64	34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-6	2	-3	-1
Ending balance	170	59	170	59
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	22	-87	13	-85
Total pretax gains (losses) included in earnings	-33	13	-21	-8
Total pretax gains (losses) included in comprehensive income	'	'	'	'
Purchases	-1	'	50	21
Sales	'	'	'	'
Issuances	1	4	'	9
Settlements	'	-3	-45	-5
Transfers out of level 3	-1	34	-4	34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-10	1	-15	-4
Ending balance	-22	-38	-22	-38
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	-49	'	-49	'
Investments [Member]	'	'	'	'
Investments	'	'	'	'
Beginning balance	188	97	98	98
Total pretax gains (losses) included in earnings	'	'	'	'
Total pretax gains (losses) included in comprehensive income	'	1	'	-1
Purchases	13	2	29	5
Sales	-13	-2	-15	-5
Issuances	'	'	'	'
Settlements	'	-2	'	-3
Transfers in and/or out of level 3	'	'	68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4	1	12	3
Ending balance	192	97	192	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	168	70	79	60
Purchases	13	2	29	5
Sales	-13	-2	-15	-5
Settlements	3	'	2	8
Transfers in and/or out of level 3	'	'	68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4	1	12	3
Ending balance	175	71	175	71
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-3	-4	-2	-12
Purchases	'	'	'	'
Sales	'	'	'	'
Settlements	3	'	2	8
Transfers out of level 3	'	'	'	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	'	'	'	'
Ending balance	'	-4	'	-4
Duke Energy Carolinas [Member] | Investments [Member]	'	'	'	'
Investments	'	'	'	'
Beginning balance	171	74	81	72
Purchases	13	2	29	5
Sales	-13	-2	-15	-5
Settlements	'	'	'	'
Transfers in and/or out of level 3	'	'	68	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4	1	12	3
Ending balance	175	75	175	75
Progress Energy [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	'	-35	'	-38
Issuances	'	2	'	10
Transfers out of level 3	2	34	'	34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-2	-1	'	-6
Ending balance	'	'	'	'
Duke Energy Progress [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	'	-35	'	-38
Issuances	'	'	'	9
Settlements	'	2	'	'
Transfers out of level 3	'	34	'	34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	'	-1	'	-5
Ending balance	'	'	'	'
Duke Energy Ohio [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	-28	-19	-4	-6
Total pretax gains (losses) included in earnings	-24	11	-43	-4
Purchases	'	'	1	1
Settlements	-2	2	-6	'
Transfers out of level 3	'	'	-4	'
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-1	'	1	3
Ending balance	-55	-6	-55	-6
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding	'	'	-52	'
Duke Energy Indiana [Member]	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]	'	'	'	'
Beginning balance	45	18	12	10
Total pretax gains (losses) included in earnings	-13	3	14	5
Purchases	'	'	49	20
Settlements	'	-10	-38	-23
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	-10	3	-15	2
Ending balance	$22	$14	$22	$14

Fair_Value_Measurements_Quanti

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

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 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]

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]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Minimum [Member]

Maximum [Member]

RTO Auction Pricing [Member]

RTO Auction Pricing [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [Member]

FERC Mitigation Power Sale Agreements [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]

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 Auction Pricing [Member]

RTO Auction Pricing [Member]

RTO Auction Pricing [Member]

RTO Auction 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]

Minimum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Discounted Cash Flow [Member]

Discounted Cash Flow [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

RTO Auction Pricing [Member]

RTO Auction Pricing [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]

RTO Auction Pricing [Member]

RTO Auction Pricing [Member]

RTO Auction Pricing [Member]

RTO Auction Pricing [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net derivative asset (liability)

($22)

$22

$13

($38)

($87)

($85)

($33)

($2)

'

'

'

'

($2)

'

'

$22

$12

'

'

'

'

($2)

$23

'

'

'

'

$5

$4

'

'

'

'

($14)

($22)

'

($3)

($2)

($4)

($4)

($12)

($2)

'

'

'

'

'

'

($35)

($38)

'

'

'

'

($35)

($38)

($55)

($28)

($4)

($6)

($19)

($6)

($33)

($2)

'

'

'

'

($10)

$18

'

'

'

'

($12)

($20)

$22

$45

$12

$14

$18

$10

$22

$12

'

'

'

'

Fair Value Inputs Price Per MMBtu

'

'

'

'

'

'

'

'

2.45

3.07

4.66

5.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.45

3.07

4.66

5.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value inputs, price per MWh

'

'

'

'

'

'

'

'

'

'

'

'

'

25.79

52.38

'

'

-2.47

-0.3

12.92

13.8

'

'

25.18

20.77

59.17

58.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.79

52.38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.35

20.77

59.6

58.9

'

'

'

'

'

'

'

'

'

'

-2.47

-0.3

12.92

13.8

Fair Value Inputs Price Per MW day

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

28.6

30.4

189.25

165.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_Additi

Fair Value Measurements (Additional Fair Value Disclosure) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	$39,858	$40,256
Long-term debt, fair value	43,602	42,592
Duke Energy Carolinas [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	8,394	8,436
Long-term debt, fair value	9,426	9,123
Progress Energy [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	14,512	14,115
Long-term debt, fair value	16,305	15,234
Duke Energy Progress [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	5,716	5,235
Long-term debt, fair value	6,013	5,323
Duke Energy Florida [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	5,102	4,886
Long-term debt, fair value	5,867	5,408
Duke Energy Ohio [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt	1,783	2,188
Long-term debt, fair value	1,967	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	$4,356	$4,171

Variable_Interest_Entities_Nar

Variable Interest Entities (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Cinergy Receivables [Member]	'
Variable Interest Entities [Line Items]	'
Minimum equity balance required by Cinergy Receivables	$3
Line of Credit Facility, Expiration Date	1-Nov-16
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Percent of proceeds received as cash	75.00%
Percent of proceeds received as subordinated note	25.00%
Duke Energy Carolinas [Member] | DERF [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Line of Credit Facility, Expiration Date	1-Oct-16
Duke Energy Progress [Member] | DEPR [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Line of Credit Facility, Expiration Date	1-Dec-16
Duke Energy Florida [Member] | DEFR [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Line of Credit Facility, Expiration Date	1-Mar-17
Duke Energy Ohio [Member] | Cinergy Receivables [Member]	'
Variable Interest Entities [Line Items]	'
Fixed interest rate added to LIBOR to compute variable rate	1.00%
Duke Energy Ohio [Member] | Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'
Variable Interest Entities [Line Items]	'
Ownership interest in OVEC	9.00%
Duke Energy Indiana [Member] | Cinergy Receivables [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 Consolidated VIEs) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	$2,069		$1,719
Other current assets	1,954		1,821
Investments and other assets	3,287		3,432
Property, plant and equipment, cost	104,140		103,115
Accumulated depreciation and amortization	-34,545		-33,625
Other deferred debits	174		181
Accounts payable	1,801		2,391
Current maturities of long-term debt	1,156		2,104
Other current liabilities	1,868		1,996
Long-Term Debt	38,702		38,152
Deferred income taxes	12,989		12,097
Asset retirement obligation	8,499		4,950
Other liabilities	1,823		1,749
Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	2,069		1,719
Other current assets	154		101
Investments and other assets	63		80
Property, plant and equipment, cost	1,874	[1]	1,680	[1]
Accumulated depreciation and amortization	-237		-175
Other deferred debits	37		36
Total assets	3,960		3,441
Accounts payable	2		2
Taxes accrued	6		10
Current maturities of long-term debt	83		80
Other current liabilities	38		27
Long-Term Debt	2,260	[2]	1,966	[2]
Deferred income taxes	292		290
Asset retirement obligation	31		26
Other liabilities	43		31
Total liabilities	2,755		2,432
Net assets of consolidated VIEs	1,205		1,009
Duke Energy Carolinas [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	695		673
Other current assets	247		309
Investments and other assets	975		1,000
Property, plant and equipment, cost	37,670		34,906
Accumulated depreciation and amortization	-12,544		-11,894
Other deferred debits	42		46
Accounts payable	514		701
Current maturities of long-term debt	7		47
Other current liabilities	399		393
Long-Term Debt	8,087		8,089
Deferred income taxes	5,725		5,706
Asset retirement obligation	3,691		1,594
Other liabilities	663		676
Duke Energy Progress [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	475		417
Other current assets	261		296
Investments and other assets	475		443
Property, plant and equipment, cost	23,511		22,273
Accumulated depreciation and amortization	-8,931		-8,623
Other deferred debits	34		32
Accounts payable	305		420
Current maturities of long-term debt	306		174
Other current liabilities	344		392
Long-Term Debt	5,410		5,061
Deferred income taxes	2,729		2,557
Asset retirement obligation	3,206		1,729
Other liabilities	159		222
Duke Energy Florida [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	403		'
Other current assets	230		182
Investments and other assets	261		252
Property, plant and equipment, cost	14,275		13,863
Accumulated depreciation and amortization	-4,460		-4,252
Other deferred debits	42		44
Accounts payable	331		333
Current maturities of long-term debt	12		11
Other current liabilities	370		445
Long-Term Debt	5,090		4,875
Deferred income taxes	2,109		1,829
Asset retirement obligation	809		833
Other liabilities	270		255
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	695		673
Other current assets	'		'
Investments and other assets	'		'
Property, plant and equipment, cost	'		'
Accumulated depreciation and amortization	'		'
Other deferred debits	1		1
Total assets	696		674
Accounts payable	'		'
Taxes accrued	'		'
Current maturities of long-term debt	'		'
Other current liabilities	'		'
Long-Term Debt	400	[2]	400	[2]
Deferred income taxes	'		'
Asset retirement obligation	'		'
Other liabilities	'		1
Total liabilities	400		401
Net assets of consolidated VIEs	296		273
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	474		416
Other current assets	'		'
Investments and other assets	'		'
Property, plant and equipment, cost	'		'
Accumulated depreciation and amortization	'		'
Other deferred debits	'		1
Total assets	474		417
Accounts payable	'		'
Taxes accrued	'		'
Current maturities of long-term debt	'		'
Other current liabilities	'		'
Long-Term Debt	300	[2]	300	[2]
Deferred income taxes	'		'
Asset retirement obligation	'		'
Other liabilities	'		'
Total liabilities	300		300
Net assets of consolidated VIEs	174		117
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	403		'
Other current assets	'		'
Investments and other assets	'		'
Property, plant and equipment, cost	'		'
Accumulated depreciation and amortization	'		'
Other deferred debits	1		'
Total assets	404		'
Accounts payable	'		'
Taxes accrued	'		'
Current maturities of long-term debt	'		'
Other current liabilities	'		'
Long-Term Debt	225	[2]	'
Deferred income taxes	'		'
Asset retirement obligation	'		'
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 and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	465		595
Other current assets	'		'
Investments and other assets	'		'
Property, plant and equipment, cost	'		'
Accumulated depreciation and amortization	'		'
Other deferred debits	'		'
Total assets	465		595
Accounts payable	'		'
Taxes accrued	'		'
Current maturities of long-term debt	'		'
Other current liabilities	'		'
Long-Term Debt	325	[2]	325	[2]
Deferred income taxes	'		'
Asset retirement obligation	'		'
Other liabilities	'		'
Total liabilities	325		325
Net assets of consolidated VIEs	140		270
Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	12		18
Other current assets	141		89
Investments and other assets	29		29
Property, plant and equipment, cost	1,856	[1]	1,662	[1]
Accumulated depreciation and amortization	-232		-170
Other deferred debits	35		34
Total assets	1,841		1,662
Accounts payable	2		2
Taxes accrued	6		10
Current maturities of long-term debt	67		66
Other current liabilities	26		17
Long-Term Debt	989	[2]	907	[2]
Deferred income taxes	292		290
Asset retirement obligation	31		26
Other liabilities	33		17
Total liabilities	1,446		1,335
Net assets of consolidated VIEs	395		327
Other VIEs [Member] | Variable Interest Entity, Primary Beneficiary [Member]	'		'
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]	'		'
Restricted receivables of VIEs	20		17
Other current assets	13		12
Investments and other assets	34		51
Property, plant and equipment, cost	18	[1]	18	[1]
Accumulated depreciation and amortization	-5		-5
Other deferred debits	'		'
Total assets	80		93
Accounts payable	'		'
Taxes accrued	'		'
Current maturities of long-term debt	16		14
Other current liabilities	12		10
Long-Term Debt	21	[2]	34	[2]
Deferred income taxes	'		'
Asset retirement obligation	'		'
Other liabilities	10		13
Total liabilities	59		71
Net assets of consolidated VIEs	$21		$22
[1]	Restricted as collateral for non-recourse debt of VIEs.
[2]	Non-recourse to the general assets of the applicable registrant.

Variable_Interest_Entities_Sch1

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Variable Interest Entities [Line Items]	'
Debt Instrument, Face Amount	$2,222,000,000
Duke Energy Progress [Member]	'
Variable Interest Entities [Line Items]	'
Debt Instrument, Face Amount	650,000,000
Duke Energy Florida [Member]	'
Variable Interest Entities [Line Items]	'
Debt Instrument, Face Amount	225,000,000
DERF [Member] | Duke Energy Carolinas [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
DEPR [Member] | Duke Energy Progress [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
DEFR [Member] | Duke Energy Florida [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

Variable_Interest_Entities_Sch2

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Variable Interest Entities [Line Items]	'	'
Investments in equity method unconsolidated affiliates	$350	$390
Investments and other assets	3,287	3,432
Other current liabilities	1,868	1,996
Deferred credits and other liabilities	31,250	26,575
Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables (net of allowance for doubtful accounts)	'	'
Investments in equity method unconsolidated affiliates	152	213
Intangibles, net	'	96
Investments and other assets	4	4
Total assets	156	313
Other current liabilities	2	3
Deferred credits and other liabilities	14	15
Total liabilities	16	18
Net assets (liabilities)	140	295
Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables (net of allowance for doubtful accounts)	'	'
Investments in equity method unconsolidated affiliates	149	153
Intangibles, net	'	'
Investments and other assets	'	'
Total assets	149	153
Other current liabilities	'	'
Deferred credits and other liabilities	'	'
Total liabilities	'	'
Net assets (liabilities)	149	153
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables (net of allowance for doubtful accounts)	'	'
Investments in equity method unconsolidated affiliates	3	60
Intangibles, net	'	96
Investments and other assets	4	4
Total assets	7	160
Other current liabilities	2	3
Deferred credits and other liabilities	14	15
Total liabilities	16	18
Net assets (liabilities)	-9	142
Duke Energy Ohio [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments and other assets	20	232
Other current liabilities	79	110
Deferred credits and other liabilities	2,300	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)	49	114
Investments in equity method unconsolidated affiliates	'	'
Intangibles, net	'	96
Investments and other assets	'	'
Total assets	49	210
Other current liabilities	'	'
Deferred credits and other liabilities	'	'
Total liabilities	'	'
Net assets (liabilities)	49	210
Duke Energy Indiana [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Investments and other assets	214	269
Other current liabilities	116	88
Deferred credits and other liabilities	2,573	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)	76	143
Investments in equity method unconsolidated affiliates	'	'
Intangibles, net	'	'
Investments and other assets	'	'
Total assets	76	143
Other current liabilities	'	'
Deferred credits and other liabilities	'	'
Total liabilities	'	'
Net assets (liabilities)	$76	$143

Variable_Interest_Entities_Fai

Variable Interest Entities (Fair Value Assumptions)(Details) (Cinergy Receivables [Member])	9 Months Ended
	Sep. 30, 2014	Sep. 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 $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Duke Energy Ohio [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables sold	$216	$290
Less: Retained interests	49	114
Net receivables sold	167	176
Duke Energy Indiana [Member]	'	'
Variable Interest Entities [Line Items]	'	'
Receivables sold	287	340
Less: Retained interests	76	143
Net receivables sold	$211	$197

Variable_Interest_Entities_Sal

Variable Interest Entities (Sales and Cash Flows)(Details) (Cinergy Receivables [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Duke Energy Ohio [Member]	'	'	'	'
Variable Interest Entities [Line Items]	'	'	'	'
Receivables sold	$477	$514	$1,705	$1,664
Loss recognized on sale	3	3	9	9
Cash proceeds from receivables sold	494	518	1,761	1,674
Collection fees received	'	'	1	1
Return received on retained interests	'	1	3	4
Duke Energy Indiana [Member]	'	'	'	'
Variable Interest Entities [Line Items]	'	'	'	'
Receivables sold	739	765	2,173	2,214
Loss recognized on sale	3	2	8	8
Cash proceeds from receivables sold	759	758	2,233	2,204
Collection fees received	'	'	1	1
Return received on retained interests	$2	$2	$5	$5

Common_Stock_Details

Common Stock (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Common Stock [Line Items]	'	'	'		'
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities b basic and diluted	$888	$942	$2,356		$1,890
Average shares, basic	707	706	707		706
Average shares, diluted	707	706	707		706
EPS, basic (usd per share)	$1.25	$1.33	$3.33		$2.67
EPS, diluted (usd per share)	$1.25	$1.33	$3.33		$2.67
Common Class A [Member]	'	'	'		'
Common Stock [Line Items]	'	'	'		'
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities b basic and diluted	$887	$942	$2,351		$1,884
Average shares, basic	707	706	707		706
Average shares, diluted	707	706	707		706
EPS, basic (usd per share)	$1.25	$1.33	$3.33		$2.67
EPS, diluted (usd per share)	$1.25	$1.33	$3.33		$2.67
Number of stock options and performance and unvested stock awards excluded from the dilutive securities calculation	'	'	2	[1]	2	[1]
Dividends declared per share (usd per share)	$0.80	$0.78	$2.36		$2.31
[1]	Stock options and performance and unvested stock awards were not included in the dilutive securities calculation 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.

StockBased_Compensation_Schedu

Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	$12	$17	$44	$63
Tax benefit associated with stock-based compensation expense	5	6	17	24
Stock-based compensation costs capitalized	1	1	3	3
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	8	10	30	36
Performance Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Pretax stock-based compensation expense	$4	$7	$14	$25

Employee_Benefit_Plans_Narrati

Employee Benefit Plans (Narrative) (Details) (USD $)	9 Months Ended			3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014
				Duke Energy Florida [Member]	Duke Energy Florida [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	'	'	4.70%	'	'
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	'	8.50%	'	'	'
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	'	5.00%	'	'	'
Defined Benefit Plan, Maximum years of participation	'35 years	'	'	'	'
Additional savings plan account contribution percentage for employees not participating in defined pension plans	4.00%	'	'	'	'
Eligible pay percentage	6.00%	'	'	'	'
Matching contribution percentage	100.00%	'	'	'	'
Contributions by employer	'	'	'	$27	$27

Employee_Benefit_Plans_Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Qualified Pension Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	$34	$41	$102	$125
Interest cost on projected benefit obligation	86	80	258	240
Expected return on plan assets	-128	-137	-383	-411
Amortization of actuarial loss (gain)	37	61	111	183
Amortization of prior service cost (credit)	-4	-2	-11	-8
Other	3	2	6	5
Net periodic costs	28	45	83	134
Qualified Pension Plans [Member] | Duke Energy Carolinas [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	10	12	31	37
Interest cost on projected benefit obligation	22	20	64	60
Expected return on plan assets	-33	-37	-99	-111
Amortization of actuarial loss (gain)	8	15	26	45
Amortization of prior service cost (credit)	-2	-2	-6	-5
Other	1	1	2	2
Net periodic costs	6	9	18	28
Qualified Pension Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	10	15	30	45
Interest cost on projected benefit obligation	28	29	84	87
Expected return on plan assets	-44	-50	-130	-149
Amortization of actuarial loss (gain)	17	26	51	76
Amortization of prior service cost (credit)	'	-1	-2	-3
Other	1	'	2	1
Net periodic costs	12	19	35	57
Qualified Pension Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	6	6	16	17
Interest cost on projected benefit obligation	13	13	40	38
Expected return on plan assets	-21	-24	-64	-71
Amortization of actuarial loss (gain)	8	11	24	34
Amortization of prior service cost (credit)	'	-1	-1	-1
Other	'	1	1	1
Net periodic costs	6	6	16	18
Qualified Pension Plans [Member] | Duke Energy Florida [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	5	8	15	23
Interest cost on projected benefit obligation	14	13	43	40
Expected return on plan assets	-21	-21	-64	-65
Amortization of actuarial loss (gain)	8	12	24	37
Amortization of prior service cost (credit)	'	-1	-1	-2
Other	'	'	1	'
Net periodic costs	6	11	18	33
Qualified Pension Plans [Member] | Duke Energy Ohio [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	1	3	4
Interest cost on projected benefit obligation	5	5	15	16
Expected return on plan assets	-7	-7	-20	-22
Amortization of actuarial loss (gain)	1	3	3	9
Amortization of prior service cost (credit)	'	'	'	'
Other	'	'	'	'
Net periodic costs	0	2	1	7
Qualified Pension Plans [Member] | Duke Energy Indiana [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	3	2	7	8
Interest cost on projected benefit obligation	7	7	22	21
Expected return on plan assets	-10	-11	-30	-33
Amortization of actuarial loss (gain)	3	6	9	17
Amortization of prior service cost (credit)	'	'	'	'
Other	'	1	'	1
Net periodic costs	3	5	8	14
Non-Qualified Pension Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	1	2	2
Interest cost on projected benefit obligation	3	3	10	10
Amortization of actuarial loss (gain)	1	1	2	4
Amortization of prior service cost (credit)	'	'	'	-1
Net periodic costs	5	5	14	15
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	1
Amortization of actuarial loss (gain)	'	'	'	'
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	1	0	1	1
Non-Qualified Pension Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	1	1	1
Interest cost on projected benefit obligation	2	1	4	5
Amortization of actuarial loss (gain)	'	1	1	3
Amortization of prior service cost (credit)	-1	'	-1	-1
Net periodic costs	1	3	5	8
Non-Qualified Pension Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	1	1	1
Interest cost on projected benefit obligation	'	'	1	1
Amortization of actuarial loss (gain)	'	1	'	1
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	1	2	2	3
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
Amortization of actuarial loss (gain)	'	1	'	1
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	0	1	1	2
Other Post-Retirement Benefit Plans [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	2	7	7	21
Interest cost on projected benefit obligation	13	19	38	55
Expected return on plan assets	-3	-4	-9	-11
Amortization of actuarial loss (gain)	9	13	29	39
Amortization of prior service cost (credit)	-31	-3	-94	-9
Net periodic costs	-10	32	-29	95
Other Post-Retirement Benefit Plans [Member] | Duke Energy Carolinas [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	1	1	2
Interest cost on projected benefit obligation	3	3	9	9
Expected return on plan assets	-2	-2	-6	-7
Amortization of actuarial loss (gain)	1	'	2	2
Amortization of prior service cost (credit)	-3	-2	-8	-6
Net periodic costs	-1	0	-2	0
Other Post-Retirement Benefit Plans [Member] | Progress Energy [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	1	6	3	17
Interest cost on projected benefit obligation	6	12	17	35
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	10	13	31	42
Amortization of prior service cost (credit)	-24	'	-71	-1
Net periodic costs	-7	31	-20	93
Other Post-Retirement Benefit Plans [Member] | Duke Energy Progress [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	3	1	9
Interest cost on projected benefit obligation	3	7	8	19
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	8	8	23	26
Amortization of prior service cost (credit)	-19	'	-55	-1
Net periodic costs	-8	18	-23	53
Other Post-Retirement Benefit Plans [Member] | Duke Energy Florida [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	2	2	6
Interest cost on projected benefit obligation	3	5	9	13
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	3	4	8	12
Amortization of prior service cost (credit)	-5	'	-16	'
Net periodic costs	1	11	3	31
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
Expected return on plan assets	'	'	'	'
Amortization of actuarial loss (gain)	'	'	-1	-1
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	'	'	0	0
Other Post-Retirement Benefit Plans [Member] | Duke Energy Indiana [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service cost	'	1	'	1
Interest cost on projected benefit obligation	1	1	4	4
Expected return on plan assets	'	-1	-1	-1
Amortization of actuarial loss (gain)	'	1	'	1
Amortization of prior service cost (credit)	'	'	'	'
Net periodic costs	$1	$2	$3	$5

Employee_Benefit_Plans_Employe

Employee Benefit Plans (Employee Savings Plans) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	$30	[1]	$30	$110	[1]	$101
Duke Energy Carolinas [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	10	[1]	10	36	[1]	34
Progress Energy [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	10	[1]	12	33	[1]	34
Duke Energy Progress [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	7	[1]	7	23	[1]	19
Duke Energy Florida [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	3	[1]	4	10	[1]	11
Duke Energy Ohio [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	'	[1]	'	2	[1]	2
Duke Energy Indiana [Member]	'		'	'		'
Employee Savings Plans [Abstract]	'		'	'		'
Pretax employer matching contributions	$1	[1]	$2	$5	[1]	$5
[1]	For the three and nine months ended SeptemberB 30, 2014, amounts include the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan.

Income_Taxes_Effective_Tax_Rat

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 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	34.00%	30.90%	31.40%	32.30%
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	33.90%	37.90%	33.70%	37.50%
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	37.10%	38.80%	37.30%	38.10%
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	36.30%	35.70%	36.60%	37.30%
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	38.50%	40.00%	38.60%	40.00%
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	38.30%	35.90%	34.90%	36.50%
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	31.60%	36.60%	35.20%	37.20%