Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 1,424	$ 2,110
Short Term Investments	333	190
Receivables (net of allowance for doubtful accounts)	1,516	784
Restricted receivables of variable interest entities	1,201	1,157
Inventory	3,223	1,588
Total current assets	10,122	6,880
Investments and Other Assets
Investments in equity method unconsolidated affiliates	483	460
Nuclear decommissioning trust funds	4,242	2,060
Goodwill	16,365	3,849
Intangibles, net	372	363
Notes receivable	71	62
Restricted other assets of variable interest entities	62	135
Other	2,399	2,231
Total investments and other assets	23,994	9,160
Property, Plant and Equipment
Cost	98,833	60,377
Cost, variable interest entities	1,558	913
Accumulated depreciation and amortization	(31,969)	(18,709)
Generation facilities to be retired, net	136	80
Net property, plant and equipment	68,558	42,661
Regulatory Assets and Deferred Debits
Regulatory assets	11,004	3,672
Other	178	153
Total regulatory assets and deferred debits	11,182	3,825
Total Assets	113,856	62,526
Current Liabilities
Accounts payable	2,444	1,433
Notes payable and commercial paper	745	154
Non-recourse notes payable of variable interest entities	312	273
Taxes accrued	459	431
Interest accrued	448	252
Current maturities of long-term debt	3,110	1,894
Other	2,511	1,091
Total current liabilities	10,029	5,528
Long-term Debt	35,499	17,730
Non-recourse Long-term Debt of Variable Interest Entities	852	949
Deferred Credits and Other Liabilities
Deferred income taxes	10,490	7,581
Investment tax credits	458	384
Accrued pension and other post-retirement benefit costs	2,520	856
Asset retirement obligations	5,169	1,936
Regulatory liabilities	5,584	2,919
Other	2,221	1,778
Total deferred credits and other liabilities	26,442	15,454
Commitments and Contingencies
Preferred stock of subsidiaries	93	0
Equity
Common Stock	1	1
Additional paid-in capital	39,279	21,132
Retained earnings	1,889	1,873
Accumulated other comprehensive loss	(306)	(234)
Net Duke Energy Corporation Shareholders' Equity	40,863	22,772
Noncontrolling interests	78	93
Total equity	40,941	22,865
Total Liabilities and Equity	113,856	62,526
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	19	289
Receivables (net of allowance for doubtful accounts)	188	262
Restricted receivables of variable interest entities	637	581
Receivables from affiliated companies	3	2
Notes receivable from affiliated companies	382	923
Inventory	1,062	917
Other	439	278
Total current assets	2,730	3,252
Investments and Other Assets
Nuclear decommissioning trust funds	2,354	2,060
Other	934	968
Total investments and other assets	3,288	3,028
Property, Plant and Equipment
Cost	34,190	32,840
Accumulated depreciation and amortization	(11,437)	(11,269)
Generation facilities to be retired, net	73	80
Net property, plant and equipment	22,826	21,651
Regulatory Assets and Deferred Debits
Regulatory assets	1,727	1,894
Other	71	71
Total regulatory assets and deferred debits	1,798	1,965
Total Assets	30,642	29,896
Current Liabilities
Accounts payable	599	637
Accounts payable to affiliated companies	128	156
Taxes accrued	114	126
Interest accrued	96	115
Current maturities of long-term debt	406	1,178
Other	490	398
Total current liabilities	1,833	2,610
Long-term Debt	7,735	7,496
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	5,181	4,555
Investment tax credits	215	233
Accrued pension and other post-retirement benefit costs	221	248
Asset retirement obligations	1,959	1,846
Regulatory liabilities	2,102	1,928
Other	924	926
Total deferred credits and other liabilities	10,602	9,736
Commitments and Contingencies
Equity
Member's Equity	9,888	9,473
Accumulated other comprehensive loss	(16)	(19)
Total member's equity	9,872	9,454
Total Liabilities and Member's Equity	30,642	29,896
Progress Energy [Member]
Current Assets
Cash and cash equivalents	231	230
Receivables (net of allowance for doubtful accounts)	790	883
Receivables from affiliated companies	15	0
Inventory	1,441	1,429
Other	766	778
Total current assets	3,243	3,320
Investments and Other Assets
Nuclear decommissioning trust funds	1,888	1,647
Goodwill	3,655	3,655
Other	530	504
Total investments and other assets	6,073	5,806
Property, Plant and Equipment
Cost	35,130	34,797
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(12,512)	(12,684)
Generation facilities to be retired, net	63	163
Net property, plant and equipment	22,697	22,292
Regulatory Assets and Deferred Debits
Regulatory assets	5,292	3,424
Other	100	89
Total regulatory assets and deferred debits	5,392	3,513
Total Assets	37,405	34,931
Current Liabilities
Accounts payable	1,066	968
Accounts payable to affiliated companies	30	0
Notes payable and commercial paper	0	671
Taxes accrued	83	56
Interest accrued	192	200
Current maturities of long-term debt	843	961
Other	1,118	1,163
Total current liabilities	3,787	4,019
Long-term Debt	13,311	11,918
Long-term debt payable to affiliated companies	274	273
Deferred Credits and Other Liabilities
Deferred income taxes	2,558	2,193
Investment tax credits	95	103
Accrued pension and other post-retirement benefit costs	1,608	1,625
Asset retirement obligations	2,413	1,265
Regulatory liabilities	2,469	2,727
Other	612	690
Total deferred credits and other liabilities	9,755	8,603
Commitments and Contingencies
Preferred stock of subsidiaries	93	93
Equity
Common Stock	0	7,418
Additional paid-in capital	7,465	16
Retained earnings	2,783	2,752
Accumulated other comprehensive loss	(67)	(165)
Net Duke Energy Corporation Shareholders' Equity	10,181	10,021
Noncontrolling interests	4	4
Total equity	10,185	10,025
Total Liabilities and Equity	37,405	34,931
Progress Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	18	20
Receivables (net of allowance for doubtful accounts)	458	492
Receivables from affiliated companies	5	1
Inventory	828	770
Other	313	226
Total current assets	1,622	1,509
Investments and Other Assets
Nuclear decommissioning trust funds	1,259	1,088
Other	251	210
Total investments and other assets	1,510	1,298
Property, Plant and Equipment
Cost	21,168	19,367
Cost, variable interest entities	16	16
Accumulated depreciation and amortization	(8,185)	(7,991)
Generation facilities to be retired, net	63	163
Net property, plant and equipment	13,062	11,555
Regulatory Assets and Deferred Debits
Regulatory assets	1,845	1,682
Other	29	22
Total regulatory assets and deferred debits	1,874	1,704
Total Assets	18,068	16,066
Current Liabilities
Accounts payable	542	518
Accounts payable to affiliated companies	76	29
Notes payable and commercial paper	0	188
Taxes accrued	23	23
Interest accrued	69	77
Current maturities of long-term debt	407	502
Other	517	417
Total current liabilities	1,998	1,785
Long-term Debt	4,433	3,704
Deferred Credits and Other Liabilities
Deferred income taxes	2,162	1,903
Investment tax credits	92	98
Accrued pension and other post-retirement benefit costs	715	687
Asset retirement obligations	1,649	896
Regulatory liabilities	1,538	1,543
Other	295	303
Total deferred credits and other liabilities	6,451	5,430
Commitments and Contingencies
Preferred stock	59	59
Equity
Common Stock	2,159	2,148
Retained earnings	2,968	3,011
Accumulated other comprehensive loss	0	(71)
Total equity	5,127	5,088
Total Liabilities and Equity	18,068	16,066
Progress Energy Florida [Member]
Current Assets
Cash and cash equivalents	131	16
Receivables (net of allowance for doubtful accounts)	318	367
Receivables from affiliated companies	20	7
Notes receivable from affiliated companies	207	0
Inventory	613	659
Other	351	419
Total current assets	1,640	1,468
Investments and Other Assets
Nuclear decommissioning trust funds	629	559
Other	182	142
Total investments and other assets	811	701
Property, Plant and Equipment
Cost	13,432	14,926
Accumulated depreciation and amortization	(4,072)	(4,474)
Net property, plant and equipment	9,360	10,452
Regulatory Assets and Deferred Debits
Regulatory assets	3,321	1,629
Other	48	44
Total regulatory assets and deferred debits	3,369	1,673
Total Assets	15,180	14,294
Current Liabilities
Accounts payable	412	340
Accounts payable to affiliated companies	44	14
Notes payable and commercial paper	0	233
Taxes accrued	48	31
Interest accrued	55	54
Current maturities of long-term debt	435	10
Other	534	576
Total current liabilities	1,528	1,266
Long-term Debt	4,885	4,671
Deferred Credits and Other Liabilities
Deferred income taxes	1,518	1,325
Accrued pension and other post-retirement benefit costs	610	598
Asset retirement obligations	764	369
Regulatory liabilities	787	1,024
Other	255	332
Total deferred credits and other liabilities	3,934	3,648
Commitments and Contingencies
Preferred stock	34	34
Equity
Common Stock	1,762	1,757
Retained earnings	3,037	2,945
Accumulated other comprehensive loss	0	(27)
Net Duke Energy Corporation Shareholders' Equity	4,799	4,675
Total Liabilities and Equity	15,180	14,294
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	31	99
Receivables (net of allowance for doubtful accounts)	108	137
Receivables from affiliated companies	82	143
Notes receivable from affiliated companies	1	401
Inventory	227	243
Other	267	220
Total current assets	716	1,243
Investments and Other Assets
Goodwill	921	921
Intangibles, net	129	143
Other	75	58
Total investments and other assets	1,125	1,122
Property, Plant and Equipment
Cost	10,824	10,632
Accumulated depreciation and amortization	(2,698)	(2,594)
Net property, plant and equipment	8,126	8,038
Regulatory Assets and Deferred Debits
Regulatory assets	579	520
Other	14	16
Total regulatory assets and deferred debits	593	536
Total Assets	10,560	10,939
Current Liabilities
Accounts payable	318	318
Accounts payable to affiliated companies	62	84
Taxes accrued	159	180
Interest accrued	14	23
Current maturities of long-term debt	261	507
Other	126	122
Total current liabilities	1,185	1,234
Long-term Debt	1,736	2,048
Deferred Credits and Other Liabilities
Deferred income taxes	1,853	1,853
Investment tax credits	6	8
Accrued pension and other post-retirement benefit costs	157	147
Asset retirement obligations	28	27
Regulatory liabilities	254	273
Other	175	182
Total deferred credits and other liabilities	2,473	2,490
Commitments and Contingencies
Equity
Common Stock	762	762
Additional paid-in capital	4,882	5,085
Retained earnings	(477)	(652)
Accumulated other comprehensive loss	(1)	(28)
Net Duke Energy Corporation Shareholders' Equity	5,166	5,167
Total equity	5,166	5,167
Total Liabilities and Equity	10,560	10,939
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	36	16
Receivables (net of allowance for doubtful accounts)	33	42
Receivables from affiliated companies	104	156
Inventory	380	330
Other	138	135
Total current assets	691	679
Investments and Other Assets
Intangibles, net	41	50
Other	122	113
Total investments and other assets	163	163
Property, Plant and Equipment
Cost	12,012	11,791
Accumulated depreciation and amortization	(3,692)	(3,393)
Net property, plant and equipment	8,320	8,398
Regulatory Assets and Deferred Debits
Regulatory assets	810	798
Other	24	24
Total regulatory assets and deferred debits	834	822
Total Assets	10,008	10,062
Current Liabilities
Accounts payable	173	201
Accounts payable to affiliated companies	60	72
Notes Payable, Related Parties, Current	81	300
Taxes accrued	61	74
Interest accrued	53	50
Current maturities of long-term debt	405	6
Other	165	93
Total current liabilities	998	796
Long-term Debt	3,147	3,303
Long-term debt payable to affiliated companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	853	927
Investment tax credits	142	143
Accrued pension and other post-retirement benefit costs	186	161
Asset retirement obligations	37	43
Regulatory liabilities	741	683
Other	46	122
Total deferred credits and other liabilities	2,005	2,079
Commitments and Contingencies
Equity
Common Stock	1	1
Additional paid-in capital	1,384	1,358
Retained earnings	2,318	2,368
Accumulated other comprehensive loss	5	7
Net Duke Energy Corporation Shareholders' Equity	3,708	3,734
Total equity	3,708	3,734
Total Liabilities and Equity	$ 10,008	$ 10,062