v2.4.0.8
Variable Interest Entities (Schedule of Consolidated VIEs) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs $ 2,069 $ 1,719
Other current assets 1,954 1,821
Investments and other assets 3,287 3,432
Property, plant and equipment, cost 104,140 103,115
Accumulated depreciation and amortization (34,545) (33,625)
Other deferred debits 174 181
Accounts payable 1,801 2,391
Current maturities of long-term debt 1,156 2,104
Other current liabilities 1,868 1,996
Long-Term Debt 38,702 38,152
Deferred income taxes 12,989 12,097
Asset retirement obligation 8,499 4,950
Other liabilities 1,823 1,749
Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 2,069 1,719
Other current assets 154 101
Investments and other assets 63 80
Property, plant and equipment, cost 1,874 [1] 1,680 [1]
Accumulated depreciation and amortization (237) (175)
Other deferred debits 37 36
Total assets 3,960 3,441
Accounts payable 2 2
Taxes accrued 6 10
Current maturities of long-term debt 83 80
Other current liabilities 38 27
Long-Term Debt 2,260 [2] 1,966 [2]
Deferred income taxes 292 290
Asset retirement obligation 31 26
Other liabilities 43 31
Total liabilities 2,755 2,432
Net assets of consolidated VIEs 1,205 1,009
Duke Energy Carolinas [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 695 673
Other current assets 247 309
Investments and other assets 975 1,000
Property, plant and equipment, cost 37,670 34,906
Accumulated depreciation and amortization (12,544) (11,894)
Other deferred debits 42 46
Accounts payable 514 701
Current maturities of long-term debt 7 47
Other current liabilities 399 393
Long-Term Debt 8,087 8,089
Deferred income taxes 5,725 5,706
Asset retirement obligation 3,691 1,594
Other liabilities 663 676
Duke Energy Progress [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 475 417
Other current assets 261 296
Investments and other assets 475 443
Property, plant and equipment, cost 23,511 22,273
Accumulated depreciation and amortization (8,931) (8,623)
Other deferred debits 34 32
Accounts payable 305 420
Current maturities of long-term debt 306 174
Other current liabilities 344 392
Long-Term Debt 5,410 5,061
Deferred income taxes 2,729 2,557
Asset retirement obligation 3,206 1,729
Other liabilities 159 222
Duke Energy Florida [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 403   
Other current assets 230 182
Investments and other assets 261 252
Property, plant and equipment, cost 14,275 13,863
Accumulated depreciation and amortization (4,460) (4,252)
Other deferred debits 42 44
Accounts payable 331 333
Current maturities of long-term debt 12 11
Other current liabilities 370 445
Long-Term Debt 5,090 4,875
Deferred income taxes 2,109 1,829
Asset retirement obligation 809 833
Other liabilities 270 255
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 695 673
Other current assets      
Investments and other assets      
Property, plant and equipment, cost      
Accumulated depreciation and amortization      
Other deferred debits 1 1
Total assets 696 674
Accounts payable      
Taxes accrued      
Current maturities of long-term debt      
Other current liabilities      
Long-Term Debt 400 [2] 400 [2]
Deferred income taxes      
Asset retirement obligation      
Other liabilities    1
Total liabilities 400 401
Net assets of consolidated VIEs 296 273
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 474 416
Other current assets      
Investments and other assets      
Property, plant and equipment, cost      
Accumulated depreciation and amortization      
Other deferred debits    1
Total assets 474 417
Accounts payable      
Taxes accrued      
Current maturities of long-term debt      
Other current liabilities      
Long-Term Debt 300 [2] 300 [2]
Deferred income taxes      
Asset retirement obligation      
Other liabilities      
Total liabilities 300 300
Net assets of consolidated VIEs 174 117
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 403  
Other current assets     
Investments and other assets     
Property, plant and equipment, cost     
Accumulated depreciation and amortization     
Other deferred debits 1  
Total assets 404  
Accounts payable     
Taxes accrued     
Current maturities of long-term debt     
Other current liabilities     
Long-Term Debt 225 [2]  
Deferred income taxes     
Asset retirement obligation     
Other liabilities     
Total liabilities 225  
Net assets of consolidated VIEs 179  
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 465 595
Other current assets      
Investments and other assets      
Property, plant and equipment, cost      
Accumulated depreciation and amortization      
Other deferred debits      
Total assets 465 595
Accounts payable      
Taxes accrued      
Current maturities of long-term debt      
Other current liabilities      
Long-Term Debt 325 [2] 325 [2]
Deferred income taxes      
Asset retirement obligation      
Other liabilities      
Total liabilities 325 325
Net assets of consolidated VIEs 140 270
Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 12 18
Other current assets 141 89
Investments and other assets 29 29
Property, plant and equipment, cost 1,856 [1] 1,662 [1]
Accumulated depreciation and amortization (232) (170)
Other deferred debits 35 34
Total assets 1,841 1,662
Accounts payable 2 2
Taxes accrued 6 10
Current maturities of long-term debt 67 66
Other current liabilities 26 17
Long-Term Debt 989 [2] 907 [2]
Deferred income taxes 292 290
Asset retirement obligation 31 26
Other liabilities 33 17
Total liabilities 1,446 1,335
Net assets of consolidated VIEs 395 327
Other VIEs [Member] | Variable Interest Entity, Primary Beneficiary [Member]
    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]    
Restricted receivables of VIEs 20 17
Other current assets 13 12
Investments and other assets 34 51
Property, plant and equipment, cost 18 [1] 18 [1]
Accumulated depreciation and amortization (5) (5)
Other deferred debits      
Total assets 80 93
Accounts payable      
Taxes accrued      
Current maturities of long-term debt 16 14
Other current liabilities 12 10
Long-Term Debt 21 [2] 34 [2]
Deferred income taxes      
Asset retirement obligation      
Other liabilities 10 13
Total liabilities 59 71
Net assets of consolidated VIEs $ 21 $ 22
[1] Restricted as collateral for non-recourse debt of VIEs.
[2] Non-recourse to the general assets of the applicable registrant.