Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Operating Revenues [Abstract]
Regulated electric	$ 20,439	$ 15,621		$ 10,589
Non-regulated electric, natural gas, and other	3,648	3,534		3,383
Regulated natural gas	511	469		557
Total operating revenues	24,598	19,624		14,529
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	7,108	5,582		3,309
Fuel used in electric generation and purchased power - non-regulated	1,822	1,722		1,488
Cost of natural gas and coal sold	254	264		348
Operation, maintenance and other	5,910	5,006		3,770
Depreciation and amortization	2,808	2,289		1,806
Property and other taxes	1,299	985		704
Impairment charges	399	666		335
Total operating expenses	19,600	16,514		11,760
Gains (Losses) on Sales of Other Assets and Other, net	(16)	16		8
Operating Income (Loss)	4,982	3,126		2,777
Other Income and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates	122	148		160
Impairments and gains on sales of unconsolidated affiliates	100	22		11
Other income and expenses, net	262	397		376
Total other income and expenses	484	567		547
Interest Expense	1,546	1,242		859
Income (Loss) From Continuing Operations Before Income Taxes	3,920	2,451		2,465
Income Tax Expense or Benefit from Continuing Operations	1,261	705		752
Income (Loss) from Continuing Operations	2,659	1,746		1,713
Income (Loss) From Discontinued Operations, net of tax	17	36		1
Net Income (Loss)	2,676	1,782		1,714
Less: Net Income (Loss) Attributable to Noncontrolling Interests	11	14		8
Net Income (Loss) Attributable to Duke Energy	2,665	1,768		1,706
Net Income (Loss) Available to Parent		1,780	[1]
Net Income (Loss)	2,676	1,782		1,714
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Pension and OPEB adjustments	38	19		(49)
Net unrealized gain (loss) on cash flow hedges	59	(28)		(57)
Reclassification into earnings from cash flow hedges	(1)	1		(4)
Unrealized gain (loss) on investments in available for sale securities	(4)	14		12
Other comprehensive income (loss), net of tax	(99)	(76)		(243)
Comprehensive Income (Loss)	2,577	1,706		1,471
Less: Comprehensive Income Attributable to Noncontrolling Interests	5	10		1
Comprehensive income (loss)	2,572	1,696		1,470
Income From Continuing Operations Attributable To Parent Common Shareholders [Abstract]
Basic	$ 3.74	$ 3.01		$ 3.83
Diluted	$ 3.74	$ 3.01		$ 3.83
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders [Abstract]
Basic	$ 0.03	$ 0.06
Diluted	$ 0.02	$ 0.06
Net income attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	$ 3.77	$ 3.07		$ 3.83
Diluted	$ 3.76	$ 3.07		$ 3.83
Dividends declared per share	$ 3.09	$ 3.03		$ 2.97
Weighted-average shares outstanding [Abstract]
Basic	706	574		444
Diluted	706	575		444
Duke Energy Carolinas [Member]
Operating Revenues [Abstract]
Total operating revenues	6,954	6,665		6,493
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	1,982	1,864		1,944
Operation, maintenance and other	1,868	1,979		1,904
Depreciation and amortization	921	921		814
Property and other taxes	374	365		340
Impairment charges		31		12
Total operating expenses	5,145	5,160		5,014
Gains (Losses) on Sales of Other Assets and Other, net		12		1
Operating Income (Loss)	1,809	1,517		1,480
Other Income and Expenses [Abstract]
Other income and expenses, net	120	185		186
Interest Expense	359	384		360
Income (Loss) From Continuing Operations Before Income Taxes	1,570	1,318		1,306
Income Tax Expense or Benefit from Continuing Operations	594	453		472
Net Income (Loss)	976	865		834
Net Income (Loss)	976	865		834
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Reclassification into earnings from cash flow hedges	1	2		3
Unrealized gain (loss) on investments in available for sale securities		1
Other comprehensive income (loss), net of tax	1	3		3
Comprehensive income (loss)	977	868		837
Progress Energy [Member]
Operating Revenues [Abstract]
Total operating revenues	9,533	9,405		8,948
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	3,851	4,304		4,043
Operation, maintenance and other	2,247	2,445		2,060
Depreciation and amortization	883	747		701
Property and other taxes	557	570		562
Impairment charges	380	200		3
Total operating expenses	7,918	8,266		7,369
Gains (Losses) on Sales of Other Assets and Other, net	3	(2)		4
Operating Income (Loss)	1,618	1,137		1,583
Other Income and Expenses [Abstract]
Other income and expenses, net	94	130		52
Interest Expense	680	740		725
Income (Loss) From Continuing Operations Before Income Taxes	1,032	527		910
Income Tax Expense or Benefit from Continuing Operations	373	172		323
Income (Loss) from Continuing Operations	659	355		587
Income (Loss) From Discontinued Operations, net of tax	16	52		(5)
Net Income (Loss)	675	407		582
Less: Net Income (Loss) Attributable to Noncontrolling Interests	3	7		7
Net Income (Loss) Attributable to Duke Energy	672	400		575
Net Income (Loss)	675	407		582
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Pension and OPEB adjustments	9	(2)		39	[2]
Net unrealized gain (loss) on cash flow hedges	0	(5)		(87)	[3]
Reclassification into earnings from cash flow hedges	(1)	8	[4]	8	[4]
Reclassification of cash flow hedges to regulatory assets	0	97	[5]	0
Other comprehensive income (loss), net of tax	8	98		(40)
Comprehensive Income (Loss)	683	505		542
Duke Energy Progress [Member]
Operating Revenues [Abstract]
Total operating revenues	4,992	4,706		4,547
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	1,925	1,895		1,755
Operation, maintenance and other	1,357	1,494		1,191
Depreciation and amortization	534	535		514
Property and other taxes	223	219		211
Impairment charges	22	54		3
Total operating expenses	4,061	4,197		3,674
Gains (Losses) on Sales of Other Assets and Other, net	1	1		3
Operating Income (Loss)	932	510		876
Other Income and Expenses [Abstract]
Other income and expenses, net	57	79		80
Interest Expense	201	207		184
Income (Loss) From Continuing Operations Before Income Taxes	788	382		772
Income Tax Expense or Benefit from Continuing Operations	288	110		256
Net Income (Loss)	500	272		516
Less: Preferred Stock Dividend Requirement	0	3		3
Net Income (Loss) Available to Parent	500	269		513
Net Income (Loss)	500	272		516
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Net unrealized gain (loss) on cash flow hedges	0	(4)		(43)	[6]
Reclassification into earnings from cash flow hedges	0	4		5
Reclassification of cash flow hedges to regulatory assets	0	71	[7]	0
Other comprehensive income (loss), net of tax	0	71		(38)
Comprehensive income (loss)	500	343		478
Duke Energy Florida [Member]
Operating Revenues [Abstract]
Total operating revenues	4,527	4,689		4,392
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	1,927	2,409		2,288
Operation, maintenance and other	898	969		883
Depreciation and amortization	330	192		169
Property and other taxes	327	346		351
Impairment charges	358	146		0
Total operating expenses	3,840	4,062		3,691
Gains (Losses) on Sales of Other Assets and Other, net	1	2		2
Operating Income (Loss)	688	629		703
Other Income and Expenses [Abstract]
Other income and expenses, net	30	39		30
Interest Expense	180	255		239
Income (Loss) From Continuing Operations Before Income Taxes	538	413		494
Income Tax Expense or Benefit from Continuing Operations	213	147		180
Net Income (Loss)	325	266		314
Less: Preferred Stock Dividend Requirement	0	2		2
Net Income (Loss) Available to Parent	325	264		312
Net Income (Loss)	325	266		314
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Net unrealized gain (loss) on cash flow hedges	(1)	0		(23)	[8]
Reclassification into earnings from cash flow hedges	0	1		0
Reclassification of cash flow hedges to regulatory assets	0	26	[9]	0
Other comprehensive income (loss), net of tax	(1)	27		(23)
Comprehensive income (loss)	324	293		291
Duke Energy Ohio [Member]
Operating Revenues [Abstract]
Regulated electric	1,368	1,386		1,518
Non-regulated electric, natural gas, and other	1,364	1,295		1,105
Regulated natural gas	513	471		558
Total operating revenues	3,245	3,152		3,181
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	429	475		380
Fuel used in electric generation and purchased power - non-regulated	1,020	832		653
Cost of natural gas and coal sold	152	142		209
Operation, maintenance and other	774	797		885
Depreciation and amortization	354	338		335
Property and other taxes	265	224		260
Impairment charges	5	2		89
Total operating expenses	2,999	2,810		2,811
Gains (Losses) on Sales of Other Assets and Other, net	5	7		5
Operating Income (Loss)	251	349		375
Other Income and Expenses [Abstract]
Other income and expenses, net	4	13		19
Interest Expense	78	89		104
Income (Loss) From Continuing Operations Before Income Taxes	177	273		290
Income Tax Expense or Benefit from Continuing Operations	75	98		96
Net Income (Loss)	102	175		194
Net Income (Loss)	102	175		194
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Pension and OPEB adjustments	1	27	[10]	(6)
Other comprehensive income (loss), net of tax	1	27		(6)
Comprehensive income (loss)	103	202		188
Duke Energy Indiana [Member]
Operating Revenues [Abstract]
Total operating revenues	2,926	2,717		2,622
Operating Expenses [Abstract]
Fuel used in electric generation and purchased power - regulated	1,131	1,088		986
Operation, maintenance and other	649	655		647
Depreciation and amortization	342	389		391
Property and other taxes	71	81		82
Impairment charges		579		234
Total operating expenses	2,193	2,792		2,340
Operating Income (Loss)	733	(75)		282
Other Income and Expenses [Abstract]
Other income and expenses, net	18	90		97
Interest Expense	170	138		137
Income (Loss) From Continuing Operations Before Income Taxes	581	(123)		242
Income Tax Expense or Benefit from Continuing Operations	223	(73)		74
Net Income (Loss)	358	(50)		168
Net Income (Loss)	358	(50)		168
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Reclassification into earnings from cash flow hedges	(2)	(2)		(1)
Other comprehensive income (loss), net of tax	(2)	(2)		(1)
Comprehensive income (loss)	$ 356	$ (52)		$ 167

[1] For the year ended December 31, 2012, consolidated net income of $1,782 million includes $2 million attributable to preferred shareholders of subsidiaries. Income attributable to preferred shareholders of subsidiaries is not a component of total equity and is excluded from the table above.

[2] Net of $27 million tax expense in 2011.

[3] Net of $56 million tax benefit in 2011.

[4] Net of $6 million tax expense in 2012 and $5 million tax expense in 2011.

[5] Net of $62 million tax expense in 2012.

[6] Net of $28 million tax benefit in 2011.

[7] Net of $46 million tax expense in 2012.

[8] Net of $15 million tax benefit in 2011.

[9] Net of $16 million tax expense in 2012.

[10] Net of $8 million tax expense in 2012.