Regulatory Matters (Schedule Of Regulatory Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	$ 737	[1]	$ 374	[1]
Regulatory Assets - Non-Current	11,004		3,672
Total Regulatory Assets	11,741		4,046
Regulatory Liabilities - Current	156		87	[2]
Regulatory Liabilities - Non-Current	5,584		2,919
Total Regulatory Liabilities	5,740		3,006
Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	221	[1]	172	[1]
Regulatory Assets - Non-Current	1,727		1,894
Total Regulatory Assets	1,948		2,066
Regulatory Liabilities - Current	78		62	[2]
Regulatory Liabilities - Non-Current	2,102		1,928
Total Regulatory Liabilities	2,180		1,990
Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	256	[1]	275	[1]
Regulatory Assets - Non-Current	5,292		3,424
Total Regulatory Assets	5,548		3,699
Regulatory Liabilities - Current	28		48	[2]
Regulatory Liabilities - Non-Current	2,469		2,727
Total Regulatory Liabilities	2,497		2,775
Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	77	[1]	31	[1]
Regulatory Assets - Non-Current	1,845		1,682
Total Regulatory Assets	1,922		1,713
Regulatory Liabilities - Current	10		2	[2]
Regulatory Liabilities - Non-Current	1,538		1,543
Total Regulatory Liabilities	1,548		1,545
Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	179	[1]	244	[1]
Regulatory Assets - Non-Current	3,321		1,629
Total Regulatory Assets	3,500		1,873
Regulatory Liabilities - Current	18		46	[2]
Regulatory Liabilities - Non-Current	787		1,024
Total Regulatory Liabilities	805		1,070
Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	46	[1]	28	[1]
Regulatory Assets - Non-Current	579		520
Total Regulatory Assets	625		548
Regulatory Liabilities - Current	39		22	[2]
Regulatory Liabilities - Non-Current	254		273
Total Regulatory Liabilities	293		295
Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	126	[1]	114	[1]
Regulatory Assets - Non-Current	810		798
Total Regulatory Assets	936		912
Regulatory Liabilities - Current	11		3	[2]
Regulatory Liabilities - Non-Current	741		683
Total Regulatory Liabilities	752		686
Removal Costs [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	4,827		2,586
Removal Costs [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	1,928		1,770
Removal Costs [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	2,048		2,240
Removal Costs [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	1,503		1,529
Removal Costs [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	401		550
Removal Costs [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	236		230
Removal Costs [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	624		590
Pension Cost [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	103		117
Pension Cost [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	18		19
Pension Cost [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	68		70
Revenues To Be Refunded to Customers [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	290
Revenues To Be Refunded to Customers [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	259		288
Revenues To Be Refunded to Customers [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	259		288
Revenues To Be Refunded to Customers [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	31
Other Regulatory Liabilities [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	52		46
Regulatory Liabilities - Non-Current	239		216
Other Regulatory Liabilities [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	24		21
Regulatory Liabilities - Non-Current	174		158
Other Regulatory Liabilities [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	1		14
Regulatory Liabilities - Non-Current	37		64
Other Regulatory Liabilities [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current			2
Regulatory Liabilities - Non-Current	35		14
Other Regulatory Liabilities [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	1		12
Regulatory Liabilities - Non-Current	2		51
Other Regulatory Liabilities [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	24		22
Regulatory Liabilities - Non-Current			24
Other Regulatory Liabilities [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	3		3
Regulatory Liabilities - Non-Current	18		23
Storm Cost Reserve [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	125
Storm Cost Reserve [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	125		135
Storm Cost Reserve [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Non-Current	125		135
Nuclear Deferral Liability [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current			15
Nuclear Deferral Liability [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current			15
Deferred fuel costs [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	55
Deferred fuel costs [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	45
Deferred fuel costs [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	10
Deferred fuel costs [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	10
Demand Side Management And Energy Efficiency [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	49		41
Demand Side Management And Energy Efficiency [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	9		41
Demand Side Management And Energy Efficiency [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	17		19
Demand Side Management And Energy Efficiency [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	17		19
Demand Side Management And Energy Efficiency [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	15
Demand Side Management And Energy Efficiency [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Liabilities - Current	8
Vacation Accrual [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	245		150
Vacation Accrual [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	85		70
Vacation Accrual [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	65
Vacation Accrual [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	65
Vacation Accrual [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	7		7
Vacation Accrual [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	13		13
Nuclear Deferral [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	65
Regulatory Assets - Non-Current	77
Nuclear Deferral [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	65
Regulatory Assets - Non-Current	77		129
Nuclear Deferral [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	65
Regulatory Assets - Non-Current	77		129
DSM Cost/Energy Efficiency [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	58		52
Regulatory Assets - Non-Current	264		70
DSM Cost/Energy Efficiency [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	36		25
Regulatory Assets - Non-Current	71		38
DSM Cost/Energy Efficiency [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	121		92
DSM Cost/Energy Efficiency [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	121		92
DSM Cost/Energy Efficiency [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	22		9
Regulatory Assets - Non-Current	72		32
DSM Cost/Energy Efficiency [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current			18
Over Distribution Of Bulk Power Marketing Sharing [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	43		41
Over Distribution Of Bulk Power Marketing Sharing [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	43		41
Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	29		31
Regulatory Assets - Non-Current	93		119
Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	27		28
Regulatory Assets - Non-Current			31
Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	19		16
Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	2		3
Regulatory Assets - Non-Current	74		72
Gasification Services Agreement Buyout Costs [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	25		25
Regulatory Assets - Non-Current	70		88
Gasification Services Agreement Buyout Costs [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	25		25
Regulatory Assets - Non-Current	70		88
Regional Transmission Organization [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	83		80
Regional Transmission Organization [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	10		13
Regional Transmission Organization [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	5		7
Regional Transmission Organization [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	5		7
Regional Transmission Organization [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	72		74
Accrued Pension And Post Retirement [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	3,306		1,726
Accrued Pension And Post Retirement [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	602		734
Accrued Pension And Post Retirement [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,650		1,506
Accrued Pension And Post Retirement [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	769		691
Accrued Pension And Post Retirement [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	754		702
Accrued Pension And Post Retirement [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	225		212
Accrued Pension And Post Retirement [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	325		314
Net Regulatory Asset Related To Income Taxes [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,373		892
Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	731		668
Net Regulatory Asset Related To Income Taxes [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	401		352
Net Regulatory Asset Related To Income Taxes [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	175		140
Net Regulatory Asset Related To Income Taxes [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	226		212
Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	82		77
Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	158		147
ARO Costs And NDTF Assets [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,461		191
ARO Costs And NDTF Assets [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	48		191
ARO Costs And NDTF Assets [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	713		540
ARO Costs And NDTF Assets [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	372		496
ARO Costs And NDTF Assets [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	341		44
Hedge Cost And Other Credits [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	710		166
Hedge Cost And Other Credits [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	88		91
Hedge Cost And Other Credits [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	550		703
Hedge Cost And Other Credits [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	240		200
Hedge Cost And Other Credits [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	310		503
Hedge Cost And Other Credits [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	9		8
Hedge Cost And Other Credits [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	63		67
Plants Retired [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,781		73
Plants Retired [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,720		15
Plants Retired [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	128		15
Plants Retired [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	1,592
Plants Retired [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	61		73
Manufactured Gas Plant Environmental Reserve [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	77		69
Manufactured Gas Plant Environmental Reserve [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	77		69
Deferred fuel costs [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	162		38
Deferred fuel costs [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	109		275
Deferred fuel costs [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current			31
Deferred fuel costs [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	109		244
Deferred fuel costs [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	1		10
Deferred fuel costs [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	52		28
Other Regulatory Assets [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	110		37
Regulatory Assets - Non-Current	237		198
Other Regulatory Assets [Member] | Duke Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	30		8
Regulatory Assets - Non-Current	177		128
Other Regulatory Assets [Member] | Progress Energy [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	17
Regulatory Assets - Non-Current	55		80
Other Regulatory Assets [Member] | Progress Energy Carolinas [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	12
Regulatory Assets - Non-Current	35		41
Other Regulatory Assets [Member] | Progress Energy Florida [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	5
Regulatory Assets - Non-Current	21		39
Other Regulatory Assets [Member] | Duke Energy Ohio [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	16		2
Regulatory Assets - Non-Current	23		32
Other Regulatory Assets [Member] | Duke Energy Indiana [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Current	34		27
Regulatory Assets - Non-Current	59		37
Debt Fair Value Adjustment [Member]
Regulatory Assets Liabilities [Line Items]
Regulatory Assets - Non-Current	$ 1,472

[1] Included in Other within Current Assets on the Consolidated Balance Sheets.

[2] Included in Other within Current Liabilities on the Consolidated Balance Sheets.