Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity Note [Abstract]
Stockholders' equity note, stock split, conversion ratio		0.3333
Preferred Stock Of Subsidiaries [Abstract]
Payments for the redemption of preferred stock	$ 96
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	1,501	1,424		2,110	1,670
Restricted Cash [Abstract]
Restricted cash	307	574
Energy Related Inventory [Abstract]
Materials and supplies	1,901	1,691
Coal held for electric generation	1,018	1,187
Oil, gas and other fuel held for electric generation	331	345
Inventory, Net, Total	3,250	3,223
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.80%	2.90%		3.20%
Unbilled Receivables [Abstract]
Unbilled receivables, current	937	920
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	30	34		35
Restricted receivables, allowance for doubtful accounts	43	44		40
Other Current Assets and Liabilities [Abstract]
Collateral aready posted	135	163
Employee-related liabilities, current	621	725
Excise Taxes [Abstract]
Excise Taxes Collected	602	466		293
Foreign Jurisdictions [Member]
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	1,086
Duke Energy Carolinas [Member]
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	23	19		289	153
Energy Related Inventory [Abstract]
Materials and supplies	654	535
Coal held for electric generation	374	488
Oil, gas and other fuel held for electric generation	37	39
Inventory, Net, Total	1,065	1,062
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.80%	2.80%		2.60%
Unbilled Receivables [Abstract]
Unbilled receivables, current	323	315
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	3	3		3
Restricted receivables, allowance for doubtful accounts	6	6		6
Other Current Assets and Liabilities [Abstract]
Employee-related liabilities, current	198	203
Derivative, collateral, obligation to return cash	120	105
Excise Taxes [Abstract]
Excise Taxes Collected	164	161		153
Duke Energy Carolinas [Member] | State [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Annual Reduction In Excise Taxes	160
Duke Energy Carolinas [Member] | State [Member] | Utility Franchise Tax Member [Member] | Current [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	3.22%
Duke Energy Carolinas [Member] | State [Member] | Utility Franchise Tax Member [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	0.00%
Duke Energy Carolinas [Member] | State [Member] | Electricity Sales Tax Member [Member] | Current [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	3.00%
Duke Energy Carolinas [Member] | State [Member] | Electricity Sales Tax Member [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	7.00%
Progress Energy [Member]
Preferred Stock Of Subsidiaries [Abstract]
Payments for the redemption of preferred stock	96	0		0
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	58	231		230	611
Energy Related Inventory [Abstract]
Materials and supplies	854	768
Coal held for electric generation	334	392
Oil, gas and other fuel held for electric generation	236	281
Inventory, Net, Total	1,424	1,441
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.50%	2.60%		2.30%
Unbilled Receivables [Abstract]
Unbilled receivables, current	189	187
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	14	16		27
Other Current Assets and Liabilities [Abstract]
Collateral aready posted	10	59
Employee-related liabilities, current	214	304
Customer deposits, current	349	342
Derivative liabilities, current	0	221
Excise Taxes [Abstract]
Excise Taxes Collected	304	317		315
Duke Energy Progress [Member]
Preferred Stock Of Subsidiaries [Abstract]
Payments for the redemption of preferred stock	62	0		0
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	21	18		20	230
Energy Related Inventory [Abstract]
Materials and supplies	567	499
Coal held for electric generation	187	232
Oil, gas and other fuel held for electric generation	99	97
Inventory, Net, Total	853	828
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.50%	2.70%		2.10%
Unbilled Receivables [Abstract]
Unbilled receivables, current	120	112
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	10	9		9
Other Current Assets and Liabilities [Abstract]
Collateral aready posted		9
Employee-related liabilities, current	121	160
Customer deposits, current	129	120
Excise Taxes [Abstract]
Excise Taxes Collected	115	113		110
Duke Energy Progress [Member] | State [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Annual Reduction In Excise Taxes	110
Duke Energy Progress [Member] | State [Member] | Utility Franchise Tax Member [Member] | Current [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	3.22%
Duke Energy Progress [Member] | State [Member] | Utility Franchise Tax Member [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	0.00%
Duke Energy Progress [Member] | State [Member] | Electricity Sales Tax Member [Member] | Current [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	3.00%
Duke Energy Progress [Member] | State [Member] | Electricity Sales Tax Member [Member] | January 2014 [Member]
Excise Taxes [Abstract]
Statutory Tax Rate	7.00%
Duke Energy Progress [Member] | Minimum [Member]
Preferred Stock Of Subsidiaries [Abstract]
Redemption price	$ 101.00
Duke Energy Progress [Member] | Maximum [Member]
Preferred Stock Of Subsidiaries [Abstract]
Redemption price	$ 110.00
Duke Energy Florida [Member]
Preferred Stock Of Subsidiaries [Abstract]
Payments for the redemption of preferred stock	34	0		0
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	16	131		16	249
Energy Related Inventory [Abstract]
Materials and supplies	287	269
Coal held for electric generation	147	160
Oil, gas and other fuel held for electric generation	137	184
Inventory, Net, Total	571	613
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.40%	2.50%		2.40%
Unbilled Receivables [Abstract]
Unbilled receivables, current	69	74
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	4	7		18
Other Current Assets and Liabilities [Abstract]
Collateral aready posted	10	50
Employee-related liabilities, current	65	95
Customer deposits, current	220	222
Derivative liabilities, current	0	127
Excise Taxes [Abstract]
Excise Taxes Collected	189	205		205
Duke Energy Florida [Member] | Minimum [Member]
Preferred Stock Of Subsidiaries [Abstract]
Redemption price	$ 101.00
Duke Energy Florida [Member] | Maximum [Member]
Preferred Stock Of Subsidiaries [Abstract]
Redemption price	$ 104.25
Duke Energy Ohio [Member]
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	36	31		99	228
Energy Related Inventory [Abstract]
Materials and supplies	117	135
Coal held for electric generation	65	82
Oil, gas and other fuel held for electric generation	47	10
Inventory, Net, Total	229	227
Depreciation Rate [Abstract]
Weighted-average depreciation rate	3.30%	3.20%		3.50%
Unbilled Receivables [Abstract]
Unbilled receivables, current	55	47
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	2	2		16
Other Current Assets and Liabilities [Abstract]
Collateral aready posted	125	104
Excise Taxes [Abstract]
Excise Taxes Collected	105	102		109
Duke Energy Ohio [Member] | Current Collateral Assets [Member]
Other Current Assets and Liabilities [Abstract]
Collateral aready posted	122	99
Duke Energy Ohio [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	89	90
Duke Energy Indiana [Member]
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents at end of period	15	36		16	54
Energy Related Inventory [Abstract]
Materials and supplies	193	161
Coal held for electric generation	238	216
Oil, gas and other fuel held for electric generation	3	3
Inventory, Net, Total	434	380
Depreciation Rate [Abstract]
Weighted-average depreciation rate	2.80%	3.30%		3.40%
Unbilled Receivables [Abstract]
Unbilled receivables, current	5	3
Allowance For Doubtful Accounts [Abstract]
Receivables, allowance for doubtful accounts	1	1		1
Other Current Assets and Liabilities [Abstract]
Federal income taxes receivable	56	0
Employee-related liabilities, current	25	23	[1]
Derivative, collateral, obligation to return cash	40	37	[1]
Derivative liabilities, current	0	63
Excise Taxes [Abstract]
Excise Taxes Collected	29	33		31
Duke Energy Indiana [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	$ 144	$ 132

[1] Does not exceed 5 percent of Total current liabilities on the Consolidated Balance Sheets at December 31, 2012.