Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets [Abstract]
Cash and cash equivalents	$ 1,531	$ 1,501
Short Term Investments	6	44
Receivables (net of allowance for doubtful accounts)	597	1,286
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	2,199	1,719
Inventory	2,908	3,250
Assets held for sale, current	515	0
Regulatory assets, current	1,148	895
Other	1,661	1,821
Total current assets	10,565	10,516
Investments and Other Assets [Abstract]
Investments in equity method unconsolidated affiliates	386	390
Nuclear decommissioning trust funds	5,231	5,132
Goodwill	16,342	16,340
Assets held for sale, noncurrent	2,341	107
Other	3,251	3,432
Total investments and other assets	27,551	25,401
Property, Plant and Equipment [Abstract]
Cost	99,874	103,115
Accumulated depreciation and amortization	(33,519)	(33,625)
Net property, plant and equipment	66,355	69,490
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	9,138	9,191
Other	183	181
Total regulatory assets and deferred debits	9,321	9,372
Total Assets	113,792	114,779
Current Liabilities [Abstract]
Accounts payable	1,892	2,391
Notes payable and commercial paper	1,737	839
Taxes accrued	423	551
Interest accrued	478	440
Liabilities associated with assets held for sale, current	222	7
Current maturities of long-term debt	885	2,104
Regulatory liabilities, current	243	316
Other	1,612	1,996
Total current liabilities	7,492	8,644
Long-term debt	39,000	38,152
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	11,852	12,097
Investment tax credits	438	442
Accrued pension and other post-retirement benefit costs	1,270	1,322
Liabilities associated with assets held for sale, noncurrent	71	66
Asset retirement obligations	4,994	4,950
Regulatory liabilities, noncurrent	6,125	5,949
Other	1,761	1,749
Total deferred credits and other liabilities	26,511	26,575
Commitments and Contingencies
Equity [Abstract]
Common stock	1	1
Additional paid-in capital	39,372	39,365
Retained earnings	1,713	2,363
Accumulated other comprehensive (loss) income	(377)	(399)
Total Common Shareholders' Equity	40,709	41,330
Noncontrolling interests	80	78
Total equity	40,789	41,408
Total Liabilities and Equity	113,792	114,779
Duke Energy Carolinas [Member]
Current Assets [Abstract]
Cash and cash equivalents	17	23
Receivables (net of allowance for doubtful accounts)	114	186
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	705	673
Receivables from affiliated companies	102	75
Notes receivable from affiliated companies	337	222
Inventory	886	1,065
Regulatory assets, current	320	295
Other	269	309
Total current assets	2,750	2,848
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,900	2,840
Other	994	1,000
Total investments and other assets	3,894	3,840
Property, Plant and Equipment [Abstract]
Cost	35,296	34,906
Accumulated depreciation and amortization	(12,125)	(11,894)
Net property, plant and equipment	23,171	23,012
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	1,459	1,527
Other	45	46
Total regulatory assets and deferred debits	1,504	1,573
Total Assets	31,319	31,273
Current Liabilities [Abstract]
Accounts payable	540	701
Accounts payable to affiliated companies	182	161
Taxes accrued	144	147
Interest accrued	136	97
Current maturities of long-term debt	47	47
Regulatory liabilities, current	44	65
Other	348	393
Total current liabilities	1,441	1,611
Long-term debt	8,089	8,089
Long-term debt payable to affiliated companies	300	300
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	5,727	5,706
Investment tax credits	208	210
Accrued pension and other post-retirement benefit costs	158	161
Asset retirement obligations	1,617	1,594
Regulatory liabilities, noncurrent	2,601	2,576
Other	667	676
Total deferred credits and other liabilities	10,978	10,923
Commitments and Contingencies	0	0
Equity [Abstract]
Member's equity	10,525	10,365
Accumulated other comprehensive (loss) income	(14)	(15)
Total Member's Equity	10,511	10,350
Total Liabilities and Equity	31,319	31,273
Progress Energy [Member]
Current Assets [Abstract]
Cash and cash equivalents	36	58
Receivables (net of allowance for doubtful accounts)	51	528
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	856	417
Receivables from affiliated companies	4	4
Notes receivable from affiliated companies	176	75
Inventory	1,391	1,424
Regulatory assets, current	530	353
Other	565	726
Total current assets	3,609	3,585
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,330	2,292
Goodwill	3,655	3,655
Other	767	804
Total investments and other assets	6,752	6,751
Property, Plant and Equipment [Abstract]
Cost	36,460	36,480
Accumulated depreciation and amortization	(13,093)	(13,098)
Net property, plant and equipment	23,367	23,382
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	4,157	4,155
Other	99	96
Total regulatory assets and deferred debits	4,256	4,251
Total Assets	37,984	37,969
Current Liabilities [Abstract]
Accounts payable	655	836
Accounts payable to affiliated companies	237	123
Notes payable to affiliated companies	922	1,213
Taxes accrued	102	105
Interest accrued	195	181
Current maturities of long-term debt	18	485
Regulatory liabilities, current	172	207
Other	747	896
Total current liabilities	3,048	4,046
Long-term debt	14,503	13,630
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	3,766	3,283
Accrued pension and other post-retirement benefit costs	633	765
Asset retirement obligations	2,587	2,562
Regulatory liabilities, noncurrent	2,402	2,292
Other	518	527
Total deferred credits and other liabilities	9,906	9,429
Commitments and Contingencies
Equity [Abstract]
Common stock	0	0
Additional paid-in capital	7,467	7,467
Retained earnings	3,112	3,452
Accumulated other comprehensive (loss) income	(54)	(59)
Total Common Shareholders' Equity	10,525	10,860
Noncontrolling interests	2	4
Total equity	10,527	10,864
Total Liabilities and Equity	37,984	37,969
Duke Energy Progress [Member]
Current Assets [Abstract]
Cash and cash equivalents	9	21
Receivables (net of allowance for doubtful accounts)	14	145
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	538	417
Receivables from affiliated companies	7	2
Notes receivable from affiliated companies	65
Inventory	823	853
Regulatory assets, current	315	127
Other	300	296
Total current assets	2,071	1,861
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	1,569	1,539
Other	459	443
Total investments and other assets	2,028	1,982
Property, Plant and Equipment [Abstract]
Cost	22,477	22,273
Accumulated depreciation and amortization	(8,749)	(8,623)
Net property, plant and equipment	13,728	13,650
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	1,446	1,384
Other	35	32
Total regulatory assets and deferred debits	1,481	1,416
Total Assets	19,308	18,909
Current Liabilities [Abstract]
Accounts payable	344	420
Accounts payable to affiliated companies	242	103
Notes payable to affiliated companies	0	462
Taxes accrued	37	37
Interest accrued	77	70
Current maturities of long-term debt	6	174
Regulatory liabilities, current	68	63
Other	329	392
Total current liabilities	1,103	1,721
Long-term debt	5,711	5,061
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	2,658	2,557
Accrued pension and other post-retirement benefit costs	316	321
Asset retirement obligations	1,758	1,729
Regulatory liabilities, noncurrent	1,792	1,673
Other	212	222
Total deferred credits and other liabilities	6,736	6,502
Equity [Abstract]
Common stock	2,159	2,159
Retained earnings	3,599	3,466
Total equity	5,758	5,625
Total Liabilities and Equity	19,308	18,909
Duke Energy Florida [Member]
Current Assets [Abstract]
Cash and cash equivalents	10	16
Receivables (net of allowance for doubtful accounts)	35	375
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	318
Receivables from affiliated companies	10	3
Notes receivable from affiliated companies	110
Inventory	568	571
Regulatory assets, current	214	221
Other	64	182
Total current assets	1,329	1,368
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	761	753
Other	252	252
Total investments and other assets	1,013	1,005
Property, Plant and Equipment [Abstract]
Cost	13,973	13,863
Accumulated depreciation and amortization	(4,337)	(4,252)
Net property, plant and equipment	9,636	9,611
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	2,711	2,729
Other	44	44
Total regulatory assets and deferred debits	2,755	2,773
Total Assets	14,733	14,757
Current Liabilities [Abstract]
Accounts payable	311	333
Accounts payable to affiliated companies	66	38
Notes payable to affiliated companies		181
Taxes accrued	75	66
Interest accrued	66	46
Current maturities of long-term debt	11	11
Regulatory liabilities, current	104	144
Other	406	445
Total current liabilities	1,039	1,264
Long-term debt	5,099	4,875
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,816	1,829
Accrued pension and other post-retirement benefit costs	284	286
Asset retirement obligations	829	833
Regulatory liabilities, noncurrent	609	618
Other	275	255
Total deferred credits and other liabilities	3,813	3,821
Commitments and Contingencies
Equity [Abstract]
Common stock	1,762	1,762
Retained earnings	3,020	3,036
Accumulated other comprehensive (loss) income		(1)
Total equity	4,782	4,797
Total Liabilities and Equity	14,733	14,757
Duke Energy Ohio [Member]
Current Assets [Abstract]
Cash and cash equivalents	38	36
Receivables (net of allowance for doubtful accounts)	53	121
Receivables from affiliated companies	127	121
Notes receivable from affiliated companies	167	57
Inventory	89	229
Assets held for sale, current	442
Regulatory assets, current	45	57
Other	128	270
Total current assets	1,089	891
Investments and Other Assets [Abstract]
Goodwill	920	920
Assets held for sale, noncurrent	2,167
Other	34	232
Total investments and other assets	3,121	1,152
Property, Plant and Equipment [Abstract]
Cost	7,029	11,143
Accumulated depreciation and amortization	(2,196)	(2,908)
Net property, plant and equipment	4,833	8,235
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	483	471
Other	9	14
Total regulatory assets and deferred debits	492	485
Total Assets	9,535	10,763
Current Liabilities [Abstract]
Accounts payable	197	319
Accounts payable to affiliated companies	64	77
Notes payable to affiliated companies	306	43
Taxes accrued	133	167
Interest accrued	30	17
Liabilities associated with assets held for sale, current	189	0
Current maturities of long-term debt	599	47
Regulatory liabilities, current	12	27
Other	72	110
Total current liabilities	1,602	807
Long-term debt	1,588	2,141
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,542	2,012
Accrued pension and other post-retirement benefit costs	32	58
Liabilities associated with assets held for sale, noncurrent	23
Asset retirement obligations	55	28
Regulatory liabilities, noncurrent	264	262
Other	150	186
Total deferred credits and other liabilities	2,066	2,546
Commitments and Contingencies
Equity [Abstract]
Common stock	762	762
Additional paid-in capital	4,782	4,882
Retained earnings	(1,265)	(375)
Total equity	4,279	5,269
Total Liabilities and Equity	9,535	10,763
Duke Energy Indiana [Member]
Current Assets [Abstract]
Cash and cash equivalents	26	15
Receivables (net of allowance for doubtful accounts)	46	22
Receivables from affiliated companies	141	151
Notes receivable from affiliated companies	190	96
Inventory	444	434
Regulatory assets, current	178	118
Other	112	125
Total current assets	1,137	961
Investments and Other Assets [Abstract]
Other	215	269
Total investments and other assets	215	269
Property, Plant and Equipment [Abstract]
Cost	12,578	12,489
Accumulated depreciation and amortization	(3,994)	(3,913)
Net property, plant and equipment	8,584	8,576
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets, noncurrent	669	717
Other	25	25
Total regulatory assets and deferred debits	694	742
Total Assets	10,630	10,548
Current Liabilities [Abstract]
Accounts payable	129	206
Accounts payable to affiliated companies	68	56
Taxes accrued	140	57
Interest accrued	51	56
Current maturities of long-term debt	5	5
Regulatory liabilities, current	15	16
Other	84	88
Total current liabilities	492	484
Long-term debt	3,641	3,641
Long-term debt payable to affiliated companies	150	150
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,175	1,171
Investment tax credits	140	140
Accrued pension and other post-retirement benefit costs	107	163
Asset retirement obligations	30	30
Regulatory liabilities, noncurrent	796	782
Other	46	48
Total deferred credits and other liabilities	2,294	2,334
Commitments and Contingencies
Equity [Abstract]
Common stock	1	1
Additional paid-in capital	1,384	1,384
Retained earnings	2,664	2,551
Accumulated other comprehensive (loss) income	4	3
Total equity	4,053	3,939
Total Liabilities and Equity	$ 10,630	$ 10,548