Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	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.