Variable Interest Entities (Schedule Of Non-Consolidated VIEs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	$ 483		$ 460
Other Assets	2,399		2,231
Intangibles	372		363
Other Current Liabilities	2,511		1,091
Deferred Credits and Other Liabilities	26,442		15,454
Long-term Debt	39,461		20,573
FPC Capital I Trust [Member]
Variable Interest Entity [Line Items]
Deferred Credits and Other Liabilities	319	[1]
Duke Energy Carolinas [Member]
Variable Interest Entity [Line Items]
Other Assets	934		968
Other Current Liabilities	490		398
Deferred Credits and Other Liabilities	10,602		9,736
Long-term Debt	8,741		9,274
Progress Energy [Member]
Variable Interest Entity [Line Items]
Other Assets	530		504
Other Current Liabilities	1,118		1,163
Deferred Credits and Other Liabilities	9,755		8,603
Long-term Debt	14,428		13,152
Progress Energy [Member] | FPC Capital I Trust [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates			9
Other Assets	9
Total Assets	9		9
Deferred Credits and Other Liabilities	274		273
Total Liabilities			273
Net Assets	(265)		(264)
Progress Energy Carolinas [Member]
Variable Interest Entity [Line Items]
Other Assets	251		210
Other Current Liabilities	517		417
Deferred Credits and Other Liabilities	6,451		5,430
Long-term Debt	4,840		4,206
Progress Energy Florida [Member]
Variable Interest Entity [Line Items]
Other Assets	182		142
Other Current Liabilities	534		576
Deferred Credits and Other Liabilities	3,934		3,648
Long-term Debt	5,320		4,681
Duke Energy Ohio [Member]
Variable Interest Entity [Line Items]
Other Assets	75		58
Intangibles	129		143
Other Current Liabilities	126		122
Deferred Credits and Other Liabilities	2,473		2,490
Long-term Debt	1,997		2,555
Duke Energy Indiana [Member]
Variable Interest Entity [Line Items]
Other Assets	122		113
Intangibles	41		50
Other Current Liabilities	165		93
Deferred Credits and Other Liabilities	2,005		2,079
Long-term Debt	3,702		3,459
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	292		235
Other Assets	11
Intangibles	104		111
Total Assets	407		346
Other Current Liabilities	3		3
Deferred Credits and Other Liabilities	336		18
Total Liabilities	339		21
Net Assets	68		325
Variable Interest Entity, Not Primary Beneficiary [Member] | Dukenet [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	118		129
Total Assets	118		129
Net Assets	118		129
Variable Interest Entity, Not Primary Beneficiary [Member] | Renewables [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	147		81
Total Assets	147		81
Net Assets	147		81
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Vies [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	27		25
Other Assets	2
Intangibles	104		111
Total Assets	133		136
Other Current Liabilities	3		3
Deferred Credits and Other Liabilities	17		18
Total Liabilities	20		21
Net Assets	113		115
Variable Interest Entity, Not Primary Beneficiary [Member] | FPC Capital I Trust [Member]
Variable Interest Entity [Line Items]
Other Assets	9
Total Assets	9
Total Liabilities	319
Net Assets	(310)
Variable Interest Entity, Not Primary Beneficiary [Member] | Duke Energy Ohio [Member]
Variable Interest Entity [Line Items]
Accounts Receivable, Net	97		129
Intangibles	104		111
Total Assets	201		240
Net Assets	201		240
Variable Interest Entity, Not Primary Beneficiary [Member] | Duke Energy Indiana [Member]
Variable Interest Entity [Line Items]
Accounts Receivable, Net	116		139
Total Assets	116		139
Net Assets	$ 116		$ 139

[1] The entire balance of Investments and other assets and $274 million of the Deferred Credits and Other Liabilities balance applies to Progress Energy.