Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 960	$ 2,036
Receivables (net of allowance for doubtful accounts)	650	791
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	2,046	1,973
Inventory	3,469	3,459
Assets held for sale		364
Regulatory assets	975	1,115
Other	1,498	1,837
Total current assets	9,598	11,575
Investments and Other Assets
Investments in equity method unconsolidated affiliates	375	358
Nuclear decommissioning trust funds	5,529	5,546
Goodwill	16,328	16,321
Assets held for sale		2,642
Other	3,239	3,008
Total investments and other assets	25,471	27,875
Property, Plant and Equipment
Cost	107,125	104,861
Accumulated depreciation and amortization	(35,826)	(34,824)
Generation Facilities To Be Retired Net	460	9
Net property, plant and equipment	71,759	70,046
Regulatory Assets and Deferred Debits
Regulatory assets	11,564	11,042
Other	183	171
Total regulatory assets and deferred debits	11,747	11,213
Total Assets	118,575	120,709
Current Liabilities
Accounts payable	1,920	2,271
Notes payable and commercial paper	2,162	2,514
Taxes accrued	550	569
Interest accrued	419	418
Current maturities of long-term debt	2,374	2,807
Liabilities associated with assets held for sale		262
Regulatory liabilities	245	204
Other	1,976	2,188
Total current liabilities	9,646	11,233
Long-Term Debt	36,795	37,213
Deferred Credits and Other Liabilities
Deferred income taxes	13,664	13,423
Investment tax credits	420	427
Accrued pension and other post-retirement benefit costs	1,152	1,145
Liabilities associated with assets held for sale		35
Asset retirement obligations	9,490	8,466
Regulatory liabilities	6,203	6,193
Other	1,588	1,675
Total deferred credits and other liabilities	$ 32,517	$ 31,364
Commitments and Contingencies
Equity
Common stock	$ 1	$ 1
Additional paid-in capital	37,933	39,405
Retained earnings	2,294	2,012
Accumulated other comprehensive income (loss)	(648)	(543)
Total Duke Energy Corporation stockholders' equity	39,580	40,875
Noncontrolling interests	37	24
Total equity	39,617	40,899
Total Liabilities and Equity	118,575	120,709
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	28	13
Receivables (net of allowance for doubtful accounts)	76	129
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	692	647
Receivables from affiliated companies	106	75
Notes receivable from affiliated companies	700	150
Inventory	1,154	1,124
Regulatory assets	343	399
Other	54	77
Total current assets	3,153	2,614
Investments and Other Assets
Nuclear decommissioning trust funds	3,094	3,042
Other	1,041	959
Total investments and other assets	4,135	4,001
Property, Plant and Equipment
Cost	38,085	37,372
Accumulated depreciation and amortization	(13,120)	(12,700)
Net property, plant and equipment	24,965	24,672
Regulatory Assets and Deferred Debits
Regulatory assets	2,631	2,465
Other	44	42
Total regulatory assets and deferred debits	2,675	2,507
Total Assets	34,928	33,794
Current Liabilities
Accounts payable	494	709
Accounts payable to affiliated companies	141	154
Taxes accrued	225	146
Interest accrued	104	95
Current maturities of long-term debt	506	507
Regulatory liabilities	31	34
Other	379	434
Total current liabilities	1,880	2,079
Long-Term Debt	8,079	7,584
Long-Term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities
Deferred income taxes	6,019	5,812
Investment tax credits	201	204
Accrued pension and other post-retirement benefit costs	109	111
Asset retirement obligations	3,604	3,428
Regulatory liabilities	2,738	2,710
Other	617	642
Total deferred credits and other liabilities	$ 13,288	$ 12,907
Commitments and Contingencies
Equity
Member's equity	$ 11,394	$ 10,937
Accumulated other comprehensive income (loss)	(13)	(13)
Total member's equity	11,381	10,924
Total Liabilities and Equity	34,928	33,794
Progress Energy [Member]
Current Assets
Cash and cash equivalents	45	42
Receivables (net of allowance for doubtful accounts)	136	129
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	854	741
Receivables from affiliated companies	114	59
Notes receivable from affiliated companies		220
Inventory	1,529	1,590
Regulatory assets	435	491
Other	709	1,285
Total current assets	3,822	4,557
Investments and Other Assets
Nuclear decommissioning trust funds	2,435	2,503
Goodwill	3,655	3,655
Other	803	670
Total investments and other assets	6,893	6,828
Property, Plant and Equipment
Cost	38,958	38,650
Accumulated depreciation and amortization	(13,614)	(13,506)
Generation Facilities To Be Retired Net	460
Net property, plant and equipment	25,804	25,144
Regulatory Assets and Deferred Debits
Regulatory assets	5,813	5,408
Other	87	91
Total regulatory assets and deferred debits	5,900	5,499
Total Assets	42,419	42,028
Current Liabilities
Accounts payable	689	847
Accounts payable to affiliated companies	271	203
Notes payable to affiliated companies	945	835
Taxes accrued	209	114
Interest accrued	179	184
Current maturities of long-term debt	1,264	1,507
Regulatory liabilities	122	106
Other	918	1,021
Total current liabilities	4,597	4,817
Long-Term Debt	12,942	13,247
Deferred Credits and Other Liabilities
Deferred income taxes	4,907	4,759
Accrued pension and other post-retirement benefit costs	553	533
Asset retirement obligations	4,995	4,711
Regulatory liabilities	2,387	2,379
Other	384	406
Total deferred credits and other liabilities	$ 13,226	$ 12,788
Commitments and Contingencies
Equity
Common stock	$ 0	$ 0
Additional paid-in capital	7,467	7,467
Retained earnings	4,255	3,782
Accumulated other comprehensive income (loss)	(41)	(41)
Total Duke Energy Corporation stockholders' equity	11,681	11,208
Noncontrolling interests	(27)	(32)
Total equity	11,654	11,176
Total Liabilities and Equity	42,419	42,028
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	13	9
Receivables (net of allowance for doubtful accounts)	49	43
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	469	436
Receivables from affiliated companies	4	10
Notes receivable from affiliated companies		237
Inventory	914	966
Regulatory assets	316	287
Other	49	384
Total current assets	1,814	2,372
Investments and Other Assets
Nuclear decommissioning trust funds	1,734	1,701
Other	464	412
Total investments and other assets	2,198	2,113
Property, Plant and Equipment
Cost	24,093	24,207
Accumulated depreciation and amortization	(8,982)	(9,021)
Generation Facilities To Be Retired Net	460
Net property, plant and equipment	15,571	15,186
Regulatory Assets and Deferred Debits
Regulatory assets	3,119	2,675
Other	33	34
Total regulatory assets and deferred debits	3,152	2,709
Total Assets	22,735	22,380
Current Liabilities
Accounts payable	342	481
Accounts payable to affiliated companies	182	120
Notes payable to affiliated companies	192
Taxes accrued	113	47
Interest accrued	78	81
Current maturities of long-term debt	402	945
Regulatory liabilities	74	71
Other	349	409
Total current liabilities	1,732	2,154
Long-Term Debt	5,255	5,256
Deferred Credits and Other Liabilities
Deferred income taxes	3,012	2,908
Accrued pension and other post-retirement benefit costs	281	290
Asset retirement obligations	4,262	3,905
Regulatory liabilities	1,891	1,832
Other	167	168
Total deferred credits and other liabilities	$ 9,613	$ 9,103
Commitments and Contingencies
Equity
Common stock	$ 2,159	$ 2,159
Retained earnings	3,976	3,708
Total equity	6,135	5,867
Total Liabilities and Equity	22,735	22,380
Duke Energy Florida [Member]
Current Assets
Cash and cash equivalents	13	8
Receivables (net of allowance for doubtful accounts)	85	84
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	385	305
Receivables from affiliated companies	93	40
Inventory	615	623
Regulatory assets	119	203
Other	282	521
Total current assets	1,592	1,784
Investments and Other Assets
Nuclear decommissioning trust funds	701	803
Other	283	204
Total investments and other assets	984	1,007
Property, Plant and Equipment
Cost	14,854	14,433
Accumulated depreciation and amortization	(4,625)	(4,478)
Net property, plant and equipment	10,229	9,955
Regulatory Assets and Deferred Debits
Regulatory assets	2,694	2,733
Other	37	39
Total regulatory assets and deferred debits	2,731	2,772
Total Assets	15,536	15,518
Current Liabilities
Accounts payable	346	365
Accounts payable to affiliated companies	73	70
Notes payable to affiliated companies	221	84
Taxes accrued	130	65
Interest accrued	45	47
Current maturities of long-term debt	562	562
Regulatory liabilities	48	35
Other	543	586
Total current liabilities	1,968	1,814
Long-Term Debt	4,293	4,298
Deferred Credits and Other Liabilities
Deferred income taxes	2,500	2,452
Accrued pension and other post-retirement benefit costs	252	221
Asset retirement obligations	733	806
Regulatory liabilities	494	547
Other	146	158
Total deferred credits and other liabilities	$ 4,125	$ 4,184
Commitments and Contingencies
Equity
Common stock	$ 1,762	$ 1,762
Retained earnings	3,388	3,460
Total equity	5,150	5,222
Total Liabilities and Equity	15,536	15,518
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	22	20
Receivables (net of allowance for doubtful accounts)	84	93
Receivables from affiliated companies	61	107
Notes receivable from affiliated companies	15	145
Inventory	102	97
Assets held for sale		316
Regulatory assets	29	49
Other	142	167
Total current assets	455	994
Investments and Other Assets
Goodwill	920	920
Assets held for sale		2,605
Other	16	23
Total investments and other assets	936	3,548
Property, Plant and Equipment
Cost	7,613	7,141
Accumulated depreciation and amortization	(2,496)	(2,213)
Generation Facilities To Be Retired Net		9
Net property, plant and equipment	5,117	4,937
Regulatory Assets and Deferred Debits
Regulatory assets	506	512
Other	8	8
Total regulatory assets and deferred debits	514	520
Total Assets	7,022	9,999
Current Liabilities
Accounts payable	193	209
Accounts payable to affiliated companies	93	74
Notes payable to affiliated companies	5	491
Taxes accrued	117	163
Interest accrued	18	19
Current maturities of long-term debt	56	157
Liabilities associated with assets held for sale		246
Regulatory liabilities	34	10
Other	154	66
Total current liabilities	670	1,435
Long-Term Debt	1,524	1,584
Long-Term Debt Payable to Affiliated Companies	25	25
Deferred Credits and Other Liabilities
Deferred income taxes	1,330	1,765
Accrued pension and other post-retirement benefit costs	56	48
Liabilities associated with assets held for sale		34
Asset retirement obligations	143	27
Regulatory liabilities	247	241
Other	168	166
Total deferred credits and other liabilities	$ 1,944	$ 2,281
Commitments and Contingencies
Equity
Common stock	$ 762	$ 762
Additional paid-in capital	2,870	4,782
Retained earnings	(773)	(870)
Total equity	2,859	4,674
Total Liabilities and Equity	7,022	9,999
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	12	6
Receivables (net of allowance for doubtful accounts)	86	87
Receivables from affiliated companies	109	115
Notes receivable from affiliated companies	25
Inventory	579	537
Regulatory assets	91	93
Other	124	326
Total current assets	1,026	1,164
Investments and Other Assets
Other	250	251
Total investments and other assets	250	251
Property, Plant and Equipment
Cost	13,667	13,034
Accumulated depreciation and amortization	(4,344)	(4,219)
Net property, plant and equipment	9,323	8,815
Regulatory Assets and Deferred Debits
Regulatory assets	707	685
Other	23	24
Total regulatory assets and deferred debits	730	709
Total Assets	11,329	10,939
Current Liabilities
Accounts payable	165	179
Accounts payable to affiliated companies	60	58
Notes payable to affiliated companies		71
Taxes accrued	33	54
Interest accrued	58	56
Current maturities of long-term debt	330	5
Regulatory liabilities	57	54
Other	90	98
Total current liabilities	793	575
Long-Term Debt	3,311	3,636
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	1,696	1,591
Investment tax credits	138	139
Accrued pension and other post-retirement benefit costs	82	82
Asset retirement obligations	453	32
Regulatory liabilities	776	796
Other	57	90
Total deferred credits and other liabilities	$ 3,202	$ 2,730
Commitments and Contingencies
Equity
Common stock	$ 1	$ 1
Additional paid-in capital	1,384	1,384
Retained earnings	2,486	2,460
Accumulated other comprehensive income (loss)	2	3
Total equity	3,873	3,848
Total Liabilities and Equity	$ 11,329	$ 10,939