Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets [Abstract]
Cash and cash equivalents	$ 1,571	$ 1,424
Short Term Investments	280	333
Receivables (net of allowance for doubtful accounts)	1,593	1,516
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	1,235	1,201
Inventory	3,130	3,223
Other	2,066	2,425
Total current assets	9,875	10,122
Investments and Other Assets [Abstract]
Investments in equity method unconsolidated affiliates	508	483
Nuclear decommissioning trust funds	4,567	4,242
Goodwill	16,345	16,365
Intangibles, net	350	372
Notes receivable	68	71
Restricted other assets of variable interest entities	57	62
Other	2,412	2,399
Total investments and other assets	24,307	23,994
Property, Plant and Equipment [Abstract]
Cost	99,661	98,833
Cost, variable interest entities	1,666	1,558
Accumulated depreciation and amortization	(32,511)	(31,969)
Generation facilities to be retired, net	61	136
Net property, plant and equipment	68,877	68,558
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	10,864	11,004
Other	177	178
Total regulatory assets and deferred debits	11,041	11,182
Total Assets	114,100	113,856
Current Liabilities [Abstract]
Accounts payable	1,936	2,444
Notes payable and commercial paper	1,501	745
Non-recourse notes payable of variable interest entities	325	312
Taxes accrued	553	459
Interest accrued	451	448
Current maturities of long-term debt	2,223	3,110
Other	3,026	2,511
Total current liabilities	10,015	10,029
Long-term Debt	36,100	35,499
Non-recourse long-term debt of variable interest entities	1,259	852
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	10,829	10,490
Investment tax credits	450	458
Accrued pension and other post-retirement benefit costs	2,373	2,520
Asset retirement obligations	5,284	5,169
Regulatory liabilities	5,483	5,584
Other	2,106	2,221
Total deferred credits and other liabilities	26,525	26,442
Commitments and Contingencies
Preferred Stock of Subsidiaries	0	93
Equity [Abstract]
Common stock	1	1
Additional paid-in capital	39,284	39,279
Retained earnings	1,223	1,889
Accumulated other comprehensive (loss) income	(376)	(306)
Total Common Shareholders' Equity	40,132	40,863
Noncontrolling interests	69	78
Total equity	40,201	40,941
Total Liabilities and Equity	114,100	113,856
Duke Energy Carolinas [Member]
Current Assets [Abstract]
Cash and cash equivalents	13	19
Receivables (net of allowance for doubtful accounts)	155	188
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	669	637
Receivables from affiliated companies	49	3
Notes receivable from affiliated companies	215	382
Inventory	1,063	1,062
Other	457	439
Total current assets	2,621	2,730
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,533	2,354
Other	948	934
Total investments and other assets	3,481	3,288
Property, Plant and Equipment [Abstract]
Cost	34,534	34,190
Accumulated depreciation and amortization	(11,502)	(11,437)
Generation facilities to be retired, net	0	73
Net property, plant and equipment	23,032	22,826
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	1,836	1,727
Other	47	71
Total regulatory assets and deferred debits	1,883	1,798
Total Assets	31,017	30,642
Current Liabilities [Abstract]
Accounts payable	487	599
Accounts payable to affiliated companies	122	128
Taxes accrued	108	114
Interest accrued	99	96
Current maturities of long-term debt	406	406
Other	441	490
Total current liabilities	1,663	1,833
Long-term Debt	7,734	7,735
Non-recourse long-term debt of variable interest entities	300	300
Long-term debt payable to affiliated companies	300	300
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	5,421	5,181
Investment tax credits	213	215
Accrued pension and other post-retirement benefit costs	212	221
Asset retirement obligations	2,021	1,959
Regulatory liabilities	2,223	2,102
Other	882	924
Total deferred credits and other liabilities	10,972	10,602
Commitments and Contingencies
Equity [Abstract]
Member's equity	10,064	9,888
Accumulated other comprehensive (loss) income	(16)	(16)
Total Member's Equity	10,048	9,872
Total Liabilities and Member's Equity	31,017	30,642
Progress Energy [Member]
Current Assets [Abstract]
Cash and cash equivalents	54	231
Receivables (net of allowance for doubtful accounts)	933	790
Receivables from affiliated companies	3	15
Notes receivable from affiliated companies	101	0
Inventory	1,371	1,441
Other	728	766
Total current assets	3,190	3,243
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,034	1,888
Goodwill	3,655	3,655
Other	516	530
Total investments and other assets	6,205	6,073
Property, Plant and Equipment [Abstract]
Cost	35,509	35,130
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(12,723)	(12,512)
Generation facilities to be retired, net	61	63
Net property, plant and equipment	22,863	22,697
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	5,193	5,292
Other	100	100
Total regulatory assets and deferred debits	5,293	5,392
Total Assets	37,551	37,405
Current Liabilities [Abstract]
Accounts payable	813	1,066
Accounts payable to affiliated companies	78	30
Notes payable to affiliated companies	858	455
Taxes accrued	208	83
Interest accrued	184	192
Current maturities of long-term debt	717	843
Other	1,285	1,118
Total current liabilities	4,143	3,787
Long-term Debt	13,503	13,311
Long-term debt payable to affiliated companies	0	274
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	2,654	2,558
Investment tax credits	91	95
Accrued pension and other post-retirement benefit costs	1,608	1,608
Asset retirement obligations	2,462	2,413
Regulatory liabilities	2,234	2,469
Other	535	612
Total deferred credits and other liabilities	9,584	9,755
Commitments and Contingencies
Preferred Stock of Subsidiaries	0	93
Equity [Abstract]
Additional paid-in capital	7,465	7,465
Retained earnings	2,916	2,783
Accumulated other comprehensive (loss) income	(63)	(67)
Total Common Shareholders' Equity	10,318	10,181
Noncontrolling interests	3	4
Total equity	10,321	10,185
Total Liabilities and Equity	37,551	37,405
Duke Energy Progress [Member]
Current Assets [Abstract]
Cash and cash equivalents	20	18
Receivables (net of allowance for doubtful accounts)	523	458
Receivables from affiliated companies	8	5
Inventory	805	828
Other	361	313
Total current assets	1,717	1,622
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	1,360	1,259
Other	281	251
Total investments and other assets	1,641	1,510
Property, Plant and Equipment [Abstract]
Cost	21,612	21,168
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(8,379)	(8,185)
Generation facilities to be retired, net	61	63
Net property, plant and equipment	13,310	13,062
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	1,905	1,845
Other	32	29
Total regulatory assets and deferred debits	1,937	1,874
Total Assets	18,605	18,068
Current Liabilities [Abstract]
Accounts payable	382	542
Accounts payable to affiliated companies	103	76
Notes payable and commercial paper	0	0
Notes payable to affiliated companies	257	364
Taxes accrued	63	23
Interest accrued	75	69
Current maturities of long-term debt	407	407
Other	451	517
Total current liabilities	1,738	1,998
Long-term Debt	4,929	4,433
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	2,305	2,162
Investment tax credits	88	92
Accrued pension and other post-retirement benefit costs	729	715
Asset retirement obligations	1,689	1,649
Regulatory liabilities	1,564	1,538
Other	251	295
Total deferred credits and other liabilities	6,626	6,451
Commitments and Contingencies
Preferred stock	0	59
Equity [Abstract]
Common stock	2,159	2,159
Retained earnings	3,153	2,968
Accumulated other comprehensive (loss) income	0	0
Total equity	5,312	5,127
Total Liabilities and Equity	18,605	18,068
Duke Energy Florida [Member]
Current Assets [Abstract]
Cash and cash equivalents	18	131
Receivables (net of allowance for doubtful accounts)	402	318
Receivables from affiliated companies	0	20
Notes receivable from affiliated companies	0	207
Inventory	569	613
Other	318	351
Total current assets	1,307	1,640
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	674	629
Other	173	182
Total investments and other assets	847	811
Property, Plant and Equipment [Abstract]
Cost	13,555	13,432
Accumulated depreciation and amortization	(4,130)	(4,072)
Net property, plant and equipment	9,425	9,360
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	3,167	3,321
Other	46	48
Total regulatory assets and deferred debits	3,213	3,369
Total Assets	14,792	15,180
Current Liabilities [Abstract]
Accounts payable	392	412
Accounts payable to affiliated companies	41	44
Notes payable to affiliated companies	11	0
Taxes accrued	175	48
Interest accrued	45	55
Current maturities of long-term debt	11	435
Other	774	534
Total current liabilities	1,449	1,528
Long-term Debt	4,881	4,885
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,567	1,518
Accrued pension and other post-retirement benefit costs	610	610
Asset retirement obligations	774	764
Regulatory liabilities	669	787
Other	216	255
Total deferred credits and other liabilities	3,836	3,934
Commitments and Contingencies
Preferred stock	0	34
Equity [Abstract]
Common stock	1,762	1,762
Retained earnings	2,864	3,037
Accumulated other comprehensive (loss) income	0	0
Total equity	4,626	4,799
Total Liabilities and Equity	14,792	15,180
Duke Energy Ohio [Member]
Current Assets [Abstract]
Cash and cash equivalents	15	31
Receivables (net of allowance for doubtful accounts)	128	108
Receivables from affiliated companies	90	82
Notes receivable from affiliated companies	19	1
Inventory	206	227
Other	279	267
Total current assets	737	716
Investments and Other Assets [Abstract]
Goodwill	920	921
Intangibles, net	122	129
Other	80	75
Total investments and other assets	1,122	1,125
Property, Plant and Equipment [Abstract]
Cost	10,970	10,824
Accumulated depreciation and amortization	(2,800)	(2,698)
Net property, plant and equipment	8,170	8,126
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	564	579
Other	13	14
Total regulatory assets and deferred debits	577	593
Total Assets	10,606	10,560
Current Liabilities [Abstract]
Accounts payable	265	318
Accounts payable to affiliated companies	58	62
Notes payable to affiliated companies	602	245
Taxes accrued	114	159
Interest accrued	14	14
Current maturities of long-term debt	8	261
Other	123	126
Total current liabilities	1,184	1,185
Long-term Debt	1,734	1,736
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,860	1,853
Investment tax credits	6	6
Accrued pension and other post-retirement benefit costs	154	157
Asset retirement obligations	29	28
Regulatory liabilities	256	254
Other	179	175
Total deferred credits and other liabilities	2,484	2,473
Commitments and Contingencies
Equity [Abstract]
Common stock	762	762
Additional paid-in capital	4,882	4,882
Retained earnings	(440)	(477)
Accumulated other comprehensive (loss) income	0	(1)
Total equity	5,204	5,166
Total Liabilities and Equity	10,606	10,560
Duke Energy Indiana [Member]
Current Assets [Abstract]
Cash and cash equivalents	8	36
Receivables (net of allowance for doubtful accounts)	32	33
Receivables from affiliated companies	110	104
Notes receivable from affiliated companies	21	0
Inventory	397	380
Other	160	138
Total current assets	728	691
Investments and Other Assets [Abstract]
Intangibles, net	35	41
Other	124	122
Total investments and other assets	159	163
Property, Plant and Equipment [Abstract]
Cost	12,213	12,012
Accumulated depreciation and amortization	(3,768)	(3,692)
Net property, plant and equipment	8,445	8,320
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	769	810
Other	23	24
Total regulatory assets and deferred debits	792	834
Total Assets	10,124	10,008
Current Liabilities [Abstract]
Accounts payable	134	173
Accounts payable to affiliated companies	47	60
Notes payable to affiliated companies	0	81
Taxes accrued	52	61
Interest accrued	55	53
Current maturities of long-term debt	5	405
Other	136	165
Total current liabilities	429	998
Long-term Debt	3,546	3,147
Long-term debt payable to affiliated companies	150	150
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	953	853
Investment tax credits	141	142
Accrued pension and other post-retirement benefit costs	183	186
Asset retirement obligations	37	37
Regulatory liabilities	755	741
Other	51	46
Total deferred credits and other liabilities	2,120	2,005
Commitments and Contingencies
Equity [Abstract]
Common stock	1	1
Additional paid-in capital	1,384	1,384
Retained earnings	2,490	2,318
Accumulated other comprehensive (loss) income	4	5
Total equity	3,879	3,708
Total Liabilities and Equity	$ 10,124	$ 10,008