Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 1,296	$ 1,424
Short Term Investments	288	333
Receivables (net of allowance for doubtful accounts)	1,503	1,516
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	1,304	1,201
Inventory	3,096	3,223
Other	2,062	2,425
Total current assets	9,549	10,122
Investments and Other Assets
Investments in equity method unconsolidated affiliates	478	483
Nuclear decommissioning trust funds	4,536	4,242
Goodwill	16,371	16,365
Intangibles, net	356	372
Notes receivable	69	71
Restricted other assets of variable interest entities	54	62
Other	2,466	2,399
Total investments and other assets	24,330	23,994
Property, Plant and Equipment
Cost	99,605	98,833
Cost, variable interest entities	1,579	1,558
Accumulated depreciation and amortization	(32,501)	(31,969)
Generation facilities to be retired, net	130	136
Net property, plant and equipment	68,813	68,558
Regulatory Assets and Deferred Debits
Regulatory assets	10,778	11,004
Other	196	178
Total regulatory assets and deferred debits	10,974	11,182
Total Assets	113,666	113,856
Current Liabilities
Accounts payable	1,985	2,444
Notes payable and commercial paper	1,361	745
Non-recourse notes payable of variable interest entities	325	312
Taxes accrued	425	459
Interest accrued	478	448
Current maturities of long-term debt	3,323	3,110
Other	2,068	2,511
Total current liabilities	9,965	10,029
Long-term Debt	35,084	35,499
Non-recourse Long-term debt of Variable Interest Entities	1,255	852
Deferred Credits and Other Liabilities
Deferred income taxes	10,518	10,490
Investment tax credits	454	458
Accrued pension and other post-retirement benefit costs	2,380	2,520
Asset retirement obligations	5,229	5,169
Regulatory liabilities	5,555	5,584
Other	2,196	2,221
Total deferred credits and other liabilities	26,332	26,442
Commitments and Contingencies
Preferred Stock of Subsidiaries	0	93
Equity
Common stock	1	1
Additional paid-in capital	39,263	39,279
Retained earnings	1,978	1,889
Accumulated other comprehensive (loss) income	(289)	(306)
Total Common Shareholders' Equity	40,953	40,863
Noncontrolling interests	77	78
Total equity	41,030	40,941
Total Liabilities and Equity	113,666	113,856
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	5	19
Receivables (net of allowance for doubtful accounts)	150	188
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	680	637
Receivables from affiliated companies	57	3
Notes receivable from affiliated companies	397	382
Inventory	1,010	1,062
Other	428	439
Total current assets	2,727	2,730
Investments and Other Assets
Nuclear decommissioning trust funds	2,519	2,354
Other	941	934
Total investments and other assets	3,460	3,288
Property, Plant and Equipment
Cost	34,559	34,190
Accumulated depreciation and amortization	(11,663)	(11,437)
Generation facilities to be retired, net	68	73
Net property, plant and equipment	22,964	22,826
Regulatory Assets and Deferred Debits
Regulatory assets	1,707	1,727
Other	69	71
Total regulatory assets and deferred debits	1,776	1,798
Total Assets	30,927	30,642
Current Liabilities
Accounts payable	520	599
Accounts payable to affiliated companies	112	128
Taxes accrued	65	114
Interest accrued	139	96
Current maturities of long-term debt	406	406
Other	409	490
Total current liabilities	1,651	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
Deferred income taxes	5,281	5,181
Investment tax credits	214	215
Accrued pension and other post-retirement benefit costs	215	221
Asset retirement obligations	1,990	1,959
Regulatory liabilities	2,214	2,102
Other	912	924
Total deferred credits and other liabilities	10,826	10,602
Commitments and Contingencies
Equity
Member's equity	10,132	9,888
Accumulated other comprehensive (loss) income	(16)	(16)
Total Member's Equity	10,116	9,872
Total Liabilities and Member's Equity	30,927	30,642
Progress Energy [Member]
Current Assets
Cash and cash equivalents	35	231
Receivables (net of allowance for doubtful accounts)	812	790
Receivables from affiliated companies	18	15
Notes receivable from affiliated companies	20	0
Inventory	1,405	1,441
Other	709	766
Total current assets	2,999	3,243
Investments and Other Assets
Nuclear decommissioning trust funds	2,017	1,888
Goodwill	3,655	3,655
Other	531	530
Total investments and other assets	6,203	6,073
Property, Plant and Equipment
Cost	35,369	35,130
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(12,624)	(12,512)
Generation facilities to be retired, net	62	63
Net property, plant and equipment	22,823	22,697
Regulatory Assets and Deferred Debits
Regulatory assets	5,158	5,292
Other	102	100
Total regulatory assets and deferred debits	5,260	5,392
Total Assets	37,285	37,405
Current Liabilities
Accounts payable	822	1,066
Accounts payable to affiliated companies	64	30
Notes payable to affiliated companies	980	455
Taxes accrued	155	83
Interest accrued	195	192
Current maturities of long-term debt	718	843
Other	924	1,118
Total current liabilities	3,858	3,787
Long-term Debt	13,506	13,311
Long-term Debt Payable to Affiliated Companies	0	274
Deferred Credits and Other Liabilities
Deferred income taxes	2,540	2,558
Investment tax credits	93	95
Accrued pension and other post-retirement benefit costs	1,610	1,608
Asset retirement obligations	2,441	2,413
Regulatory liabilities	2,324	2,469
Other	578	612
Total deferred credits and other liabilities	9,586	9,755
Commitments and Contingencies
Preferred Stock of Subsidiaries	0	93
Equity
Additional paid-in capital	7,465	7,465
Retained earnings	2,933	2,783
Accumulated other comprehensive (loss) income	(65)	(67)
Total Common Shareholders' Equity	10,333	10,181
Noncontrolling interests	2	4
Total equity	10,335	10,185
Total Liabilities and Equity	37,285	37,405
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	11	18
Receivables (net of allowance for doubtful accounts)	483	458
Receivables from affiliated companies	18	5
Inventory	808	828
Other	308	313
Total current assets	1,628	1,622
Investments and Other Assets
Nuclear decommissioning trust funds	1,347	1,259
Other	269	251
Total investments and other assets	1,616	1,510
Property, Plant and Equipment
Cost	21,413	21,168
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(8,312)	(8,185)
Generation facilities to be retired, net	62	63
Net property, plant and equipment	13,179	13,062
Regulatory Assets and Deferred Debits
Regulatory assets	1,791	1,845
Other	32	29
Total regulatory assets and deferred debits	1,823	1,874
Total Assets	18,246	18,068
Current Liabilities
Accounts payable	373	542
Accounts payable to affiliated companies	157	76
Notes payable and commercial paper	0	0
Notes payable to affiliated companies	38	364
Taxes accrued	55	23
Interest accrued	73	69
Current maturities of long-term debt	407	407
Other	407	517
Total current liabilities	1,510	1,998
Long-term Debt	4,929	4,433
Deferred Credits and Other Liabilities
Deferred income taxes	2,210	2,162
Investment tax credits	90	92
Accrued pension and other post-retirement benefit costs	723	715
Asset retirement obligations	1,669	1,649
Regulatory liabilities	1,598	1,538
Other	282	295
Total deferred credits and other liabilities	6,572	6,451
Commitments and Contingencies
Preferred stock	0	59
Equity
Common stock	2,159	2,159
Retained earnings	3,076	2,968
Accumulated other comprehensive (loss) income	0	0
Total equity	5,235	5,127
Total Liabilities and Equity	18,246	18,068
Duke Energy Florida [Member]
Current Assets
Cash and cash equivalents	7	131
Receivables (net of allowance for doubtful accounts)	313	318
Receivables from affiliated companies	64	20
Notes receivable from affiliated companies	0	207
Inventory	598	613
Other	354	351
Total current assets	1,336	1,640
Investments and Other Assets
Nuclear decommissioning trust funds	670	629
Other	176	182
Total investments and other assets	846	811
Property, Plant and Equipment
Cost	13,615	13,432
Accumulated depreciation and amortization	(4,102)	(4,072)
Net property, plant and equipment	9,513	9,360
Regulatory Assets and Deferred Debits
Regulatory assets	3,243	3,321
Other	47	48
Total regulatory assets and deferred debits	3,290	3,369
Total Assets	14,985	15,180
Current Liabilities
Accounts payable	382	412
Accounts payable to affiliated companies	65	44
Notes payable to affiliated companies	238	0
Taxes accrued	125	48
Interest accrued	68	55
Current maturities of long-term debt	10	435
Other	461	534
Total current liabilities	1,349	1,528
Long-term Debt	4,884	4,885
Deferred Credits and Other Liabilities
Deferred income taxes	1,502	1,518
Accrued pension and other post-retirement benefit costs	612	610
Asset retirement obligations	772	764
Regulatory liabilities	724	787
Other	234	255
Total deferred credits and other liabilities	3,844	3,934
Commitments and Contingencies
Preferred stock	0	34
Equity
Common stock	1,762	1,762
Retained earnings	3,146	3,037
Accumulated other comprehensive (loss) income	0	0
Total equity	4,908	4,799
Total Liabilities and Equity	14,985	15,180
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	27	31
Receivables (net of allowance for doubtful accounts)	124	108
Receivables from affiliated companies	123	82
Notes receivable from affiliated companies	4	1
Inventory	216	227
Other	257	267
Total current assets	751	716
Investments and Other Assets
Goodwill	921	921
Intangibles, net	124	129
Other	53	75
Total investments and other assets	1,098	1,125
Property, Plant and Equipment
Cost	10,897	10,824
Accumulated depreciation and amortization	(2,758)	(2,698)
Net property, plant and equipment	8,139	8,126
Regulatory Assets and Deferred Debits
Regulatory assets	582	579
Other	13	14
Total regulatory assets and deferred debits	595	593
Total Assets	10,583	10,560
Current Liabilities
Accounts payable	296	318
Accounts payable to affiliated companies	65	62
Notes payable to affiliated companies	337	245
Taxes accrued	124	159
Interest accrued	29	14
Current maturities of long-term debt	259	261
Other	117	126
Total current liabilities	1,227	1,185
Long-term Debt	1,735	1,736
Deferred Credits and Other Liabilities
Deferred income taxes	1,857	1,853
Investment tax credits	6	6
Accrued pension and other post-retirement benefit costs	155	157
Asset retirement obligations	29	28
Regulatory liabilities	255	254
Other	173	175
Total deferred credits and other liabilities	2,475	2,473
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	4,882	4,882
Retained earnings	(498)	(477)
Accumulated other comprehensive (loss) income	0	(1)
Total equity	5,146	5,166
Total Liabilities and Equity	10,583	10,560
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	23	36
Receivables (net of allowance for doubtful accounts)	29	33
Receivables from affiliated companies	143	104
Inventory	375	380
Other	141	138
Total current assets	711	691
Investments and Other Assets
Intangibles, net	37	41
Other	130	122
Total investments and other assets	167	163
Property, Plant and Equipment
Cost	12,119	12,012
Accumulated depreciation and amortization	(3,746)	(3,692)
Net property, plant and equipment	8,373	8,320
Regulatory Assets and Deferred Debits
Regulatory assets	785	810
Other	24	24
Total regulatory assets and deferred debits	809	834
Total Assets	10,060	10,008
Current Liabilities
Accounts payable	123	173
Accounts payable to affiliated companies	56	60
Notes payable to affiliated companies	27	81
Taxes accrued	80	61
Interest accrued	48	53
Current maturities of long-term debt	405	405
Other	146	165
Total current liabilities	885	998
Long-term Debt	3,147	3,147
Long-term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	920	853
Investment tax credits	141	142
Accrued pension and other post-retirement benefit costs	185	186
Asset retirement obligations	37	37
Regulatory liabilities	746	741
Other	51	46
Total deferred credits and other liabilities	2,080	2,005
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	1,384	1,384
Retained earnings	2,408	2,318
Accumulated other comprehensive (loss) income	5	5
Total equity	3,798	3,708
Total Liabilities and Equity	$ 10,060	$ 10,008