Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	$ 390		$ 483
Investments and other assets	3,539		2,904
Other current liabilities	2,003		2,355
Deferred credits and other liabilities	26,575		26,442
Long-term debt	40,256		39,461
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	213		292
Investments and other assets	4		11
Intangibles	96		104
Total assets	313		407
Other current liabilities	3		3
Deferred credits and other liabilities	15		336
Total liabilities	18		339
Net assets (liabilities)	295		68
DukeNet [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates			118
Total assets			118
Net assets (liabilities)			118
Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	153		147
Total assets	153		147
Net assets (liabilities)	153		147
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	60		27
Investments and other assets	4		2
Intangibles	96		104
Total assets	160		133
Other current liabilities	3		3
Deferred credits and other liabilities	15		17
Total liabilities	18		20
Net assets (liabilities)	142		113
FPC Capital I Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments and other assets			9	[1]
Total assets			9	[1]
Deferred credits and other liabilities			319	[1]
Total liabilities			319	[1]
Net assets (liabilities)			(310)	[1]
Duke Energy Carolinas [Member]
Variable Interest Entity [Line Items]
Investments and other assets	1,000		934
Other current liabilities	393		412
Deferred credits and other liabilities	10,923		10,602
Long-term debt	8,436		8,741
Progress Energy [Member]
Variable Interest Entity [Line Items]
Investments and other assets	804		530
Other current liabilities	896		1,090
Deferred credits and other liabilities	9,429		9,755
Long-term debt	14,115		14,428
Progress Energy [Member] | FPC Capital I Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investments and other assets			9
Deferred credits and other liabilities			274
Net assets (liabilities)			(265)
Duke Energy Progress [Member]
Variable Interest Entity [Line Items]
Investments and other assets	443		251
Other current liabilities	392		507
Deferred credits and other liabilities	6,502		6,451
Long-term debt	5,235		4,840
Duke Energy Florida [Member]
Variable Interest Entity [Line Items]
Investments and other assets	252		182
Other current liabilities	445		516
Deferred credits and other liabilities	3,821		3,934
Long-term debt	4,886		5,320
Duke Energy Ohio [Member]
Variable Interest Entity [Line Items]
Investments and other assets	232		204
Other current liabilities	110		87
Deferred credits and other liabilities	2,546		2,473
Long-term debt	2,188		1,997
Duke Energy Ohio [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Receivables	114	[2]	97	[2]
Intangibles	96	[2]	104	[2]
Total assets	210	[2]	201	[2]
Net assets (liabilities)	210	[2]	201	[2]
Duke Energy Indiana [Member]
Variable Interest Entity [Line Items]
Investments and other assets	269		163
Other current liabilities	88		154
Deferred credits and other liabilities	2,334		2,005
Long-term debt	3,796		3,702
Duke Energy Indiana [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Receivables	143	[3]	116	[3]
Total assets	143	[3]	116	[3]
Net assets (liabilities)	$ 143	[3]	$ 116	[3]

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

[2] Reflects OVEC and retained interest in CRC.

[3] Reflects retained interest in CRC.