Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 1,370	$ 2,036
Receivables (net of allowance for doubtful accounts)	722	791
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	2,037	1,973
Inventory	3,537	3,459
Assets held for sale		364
Regulatory assets	963	1,115
Other	1,566	1,837
Total current assets	10,195	11,575
Investments and Other Assets
Investments in equity method unconsolidated affiliates	501	358
Nuclear decommissioning trust funds	5,566	5,546
Goodwill	16,312	16,321
Assets held for sale		2,642
Other	3,205	3,008
Total investments and other assets	25,584	27,875
Property, Plant and Equipment
Cost	110,795	104,861
Accumulated depreciation and amortization	(37,479)	(34,824)
Generation Facilities To Be Retired Net	460	9
Net property, plant and equipment	73,776	70,046
Regulatory Assets and Deferred Debits
Regulatory assets	11,290	11,042
Other	188	171
Total regulatory assets and deferred debits	11,478	11,213
Total Assets	121,033	120,709
Current Liabilities
Accounts payable	2,078	2,271
Notes payable and commercial paper	2,419	2,514
Taxes accrued	628	569
Interest accrued	483	418
Current maturities of long-term debt	2,536	2,807
Liabilities associated with assets held for sale		262
Regulatory liabilities	320	204
Other	2,052	2,188
Total current liabilities	10,516	11,233
Long-Term Debt	37,667	37,213
Deferred Credits and Other Liabilities
Deferred income taxes	13,999	13,423
Investment tax credits	416	427
Accrued pension and other post-retirement benefit costs	1,130	1,145
Liabilities associated with assets held for sale		35
Asset retirement obligations	9,713	8,466
Regulatory liabilities	6,129	6,193
Other	1,595	1,675
Total deferred credits and other liabilities	$ 32,982	$ 31,364
Commitments and Contingencies
Equity
Common stock	$ 1	$ 1
Additional paid-in capital	37,953	39,405
Retained earnings	2,656	2,012
Accumulated other comprehensive income (loss)	(778)	(543)
Total Duke Energy Corporation stockholders' equity	39,832	40,875
Noncontrolling interests	36	24
Total equity	39,868	40,899
Total Liabilities and Equity	121,033	120,709
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	198	13
Receivables (net of allowance for doubtful accounts)	110	129
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	687	647
Receivables from affiliated companies	75	75
Notes receivable from affiliated companies	699	150
Inventory	1,167	1,124
Regulatory assets	322	399
Other	164	77
Total current assets	3,422	2,614
Investments and Other Assets
Nuclear decommissioning trust funds	2,953	3,042
Other	1,018	959
Total investments and other assets	3,971	4,001
Property, Plant and Equipment
Cost	38,653	37,372
Accumulated depreciation and amortization	(13,445)	(12,700)
Net property, plant and equipment	25,208	24,672
Regulatory Assets and Deferred Debits
Regulatory assets	2,741	2,465
Other	43	42
Total regulatory assets and deferred debits	2,784	2,507
Total Assets	35,385	33,794
Current Liabilities
Accounts payable	623	709
Accounts payable to affiliated companies	143	154
Taxes accrued	335	146
Interest accrued	146	95
Current maturities of long-term debt	506	507
Regulatory liabilities	36	34
Other	415	434
Total current liabilities	2,204	2,079
Long-Term Debt	8,078	7,584
Long-Term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities
Deferred income taxes	6,067	5,812
Investment tax credits	200	204
Accrued pension and other post-retirement benefit costs	107	111
Asset retirement obligations	3,599	3,428
Regulatory liabilities	2,747	2,710
Other	618	642
Total deferred credits and other liabilities	$ 13,338	$ 12,907
Commitments and Contingencies
Equity
Member's equity	$ 11,476	$ 10,937
Accumulated other comprehensive income (loss)	(11)	(13)
Total member's equity	11,465	10,924
Total Liabilities and Equity	35,385	33,794
Progress Energy [Member]
Current Assets
Cash and cash equivalents	158	42
Receivables (net of allowance for doubtful accounts)	172	129
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	863	741
Receivables from affiliated companies	121	59
Notes receivable from affiliated companies	251	220
Inventory	1,604	1,590
Regulatory assets	442	491
Other	633	1,285
Total current assets	4,244	4,557
Investments and Other Assets
Nuclear decommissioning trust funds	2,612	2,503
Goodwill	3,655	3,655
Other	850	670
Total investments and other assets	7,117	6,828
Property, Plant and Equipment
Cost	41,940	38,650
Accumulated depreciation and amortization	(14,862)	(13,506)
Generation Facilities To Be Retired Net	460
Net property, plant and equipment	27,538	25,144
Regulatory Assets and Deferred Debits
Regulatory assets	5,535	5,408
Other	92	91
Total regulatory assets and deferred debits	5,627	5,499
Total Assets	44,526	42,028
Current Liabilities
Accounts payable	697	847
Accounts payable to affiliated companies	238	203
Notes payable to affiliated companies	434	835
Taxes accrued	192	114
Interest accrued	198	184
Current maturities of long-term debt	1,265	1,507
Regulatory liabilities	193	106
Other	954	1,021
Total current liabilities	4,171	4,817
Long-Term Debt	14,131	13,247
Deferred Credits and Other Liabilities
Deferred income taxes	5,001	4,759
Accrued pension and other post-retirement benefit costs	545	533
Asset retirement obligations	5,222	4,711
Regulatory liabilities	2,382	2,379
Other	345	406
Total deferred credits and other liabilities	$ 13,495	$ 12,788
Commitments and Contingencies
Equity
Additional paid-in capital	$ 8,092	$ 7,467
Retained earnings	4,703	3,782
Accumulated other comprehensive income (loss)	(41)	(41)
Total Duke Energy Corporation stockholders' equity	12,754	11,208
Noncontrolling interests	(25)	(32)
Total equity	12,729	11,176
Total Liabilities and Equity	44,526	42,028
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	123	9
Receivables (net of allowance for doubtful accounts)	63	43
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	468	436
Receivables from affiliated companies	6	10
Notes receivable from affiliated companies	307	237
Inventory	986	966
Regulatory assets	333	287
Other	53	384
Total current assets	2,339	2,372
Investments and Other Assets
Nuclear decommissioning trust funds	1,943	1,701
Other	484	412
Total investments and other assets	2,427	2,113
Property, Plant and Equipment
Cost	26,919	24,207
Accumulated depreciation and amortization	(10,207)	(9,021)
Generation Facilities To Be Retired Net	460
Net property, plant and equipment	17,172	15,186
Regulatory Assets and Deferred Debits
Regulatory assets	2,816	2,675
Other	40	34
Total regulatory assets and deferred debits	2,856	2,709
Total Assets	24,794	22,380
Current Liabilities
Accounts payable	381	481
Accounts payable to affiliated companies	141	120
Taxes accrued	83	47
Interest accrued	86	81
Current maturities of long-term debt	402	945
Regulatory liabilities	80	71
Other	375	409
Total current liabilities	1,548	2,154
Long-Term Debt	6,449	5,256
Deferred Credits and Other Liabilities
Deferred income taxes	3,097	2,908
Accrued pension and other post-retirement benefit costs	277	290
Asset retirement obligations	4,489	3,905
Regulatory liabilities	1,825	1,832
Other	120	168
Total deferred credits and other liabilities	$ 9,808	$ 9,103
Commitments and Contingencies
Equity
Member's equity	$ 6,989
Common stock		$ 2,159
Retained earnings		3,708
Total equity		5,867
Total member's equity	6,989
Total Liabilities and Equity	24,794	22,380
Duke Energy Florida [Member]
Current Assets
Cash and cash equivalents	16	8
Receivables (net of allowance for doubtful accounts)	107	84
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	395	305
Receivables from affiliated companies	98	40
Inventory	618	623
Regulatory assets	108	203
Other	179	521
Total current assets	1,521	1,784
Investments and Other Assets
Nuclear decommissioning trust funds	669	803
Other	308	204
Total investments and other assets	977	1,007
Property, Plant and Equipment
Cost	15,011	14,433
Accumulated depreciation and amortization	(4,648)	(4,478)
Net property, plant and equipment	10,363	9,955
Regulatory Assets and Deferred Debits
Regulatory assets	2,719	2,733
Other	36	39
Total regulatory assets and deferred debits	2,755	2,772
Total Assets	15,616	15,518
Current Liabilities
Accounts payable	316	365
Accounts payable to affiliated companies	80	70
Notes payable to affiliated companies	245	84
Taxes accrued	108	65
Interest accrued	62	47
Current maturities of long-term debt	563	562
Regulatory liabilities	113	35
Other	553	586
Total current liabilities	2,040	1,814
Long-Term Debt	4,287	4,298
Deferred Credits and Other Liabilities
Deferred income taxes	2,579	2,452
Accrued pension and other post-retirement benefit costs	249	221
Asset retirement obligations	732	806
Regulatory liabilities	556	547
Other	157	158
Total deferred credits and other liabilities	$ 4,273	$ 4,184
Commitments and Contingencies
Equity
Member's equity	$ 5,016
Common stock		$ 1,762
Retained earnings		3,460
Total equity		5,222
Total member's equity	5,016
Total Liabilities and Equity	15,616	15,518
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	24	20
Receivables (net of allowance for doubtful accounts)	81	93
Receivables from affiliated companies	61	107
Notes receivable from affiliated companies		145
Inventory	103	97
Assets held for sale		316
Regulatory assets	32	49
Other	167	167
Total current assets	468	994
Investments and Other Assets
Goodwill	920	920
Assets held for sale		2,605
Other	17	23
Total investments and other assets	937	3,548
Property, Plant and Equipment
Cost	7,649	7,141
Accumulated depreciation and amortization	(2,474)	(2,213)
Generation Facilities To Be Retired Net		9
Net property, plant and equipment	5,175	4,937
Regulatory Assets and Deferred Debits
Regulatory assets	495	512
Other	8	8
Total regulatory assets and deferred debits	503	520
Total Assets	7,083	9,999
Current Liabilities
Accounts payable	219	209
Accounts payable to affiliated companies	42	74
Notes payable to affiliated companies	134	491
Taxes accrued	131	163
Interest accrued	28	19
Current maturities of long-term debt	56	157
Liabilities associated with assets held for sale		246
Regulatory liabilities	25	10
Other	151	66
Total current liabilities	786	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	1,395	1,765
Accrued pension and other post-retirement benefit costs	52	48
Liabilities associated with assets held for sale		34
Asset retirement obligations	143	27
Regulatory liabilities	251	241
Other	165	166
Total deferred credits and other liabilities	$ 2,006	$ 2,281
Commitments and Contingencies
Equity
Common stock	$ 762	$ 762
Additional paid-in capital	2,721	4,782
Retained earnings	(741)	(870)
Total equity	2,742	4,674
Total Liabilities and Equity	7,083	9,999
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	62	6
Receivables (net of allowance for doubtful accounts)	90	87
Receivables from affiliated companies	72	115
Notes receivable from affiliated companies	166
Inventory	564	537
Regulatory assets	97	93
Other	167	326
Total current assets	1,218	1,164
Investments and Other Assets
Total investments and other assets	243	251
Property, Plant and Equipment
Cost	13,765	13,034
Accumulated depreciation and amortization	(4,425)	(4,219)
Net property, plant and equipment	9,340	8,815
Regulatory Assets and Deferred Debits
Regulatory assets	645	685
Other	22	24
Total regulatory assets and deferred debits	667	709
Total Assets	11,468	10,939
Current Liabilities
Accounts payable	149	179
Accounts payable to affiliated companies	50	58
Notes payable to affiliated companies		71
Taxes accrued	43	54
Interest accrued	53	56
Current maturities of long-term debt	480	5
Regulatory liabilities	67	54
Other	89	98
Total current liabilities	931	575
Long-Term Debt	3,160	3,636
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	1,774	1,591
Investment tax credits	138	139
Accrued pension and other post-retirement benefit costs	83	82
Asset retirement obligations	449	32
Regulatory liabilities	758	796
Other	107	90
Total deferred credits and other liabilities	$ 3,309	$ 2,730
Commitments and Contingencies
Equity
Common stock	$ 1	$ 1
Additional paid-in capital	1,384	1,384
Retained earnings	2,532	2,460
Accumulated other comprehensive income (loss)	1	3
Total equity	3,918	3,848
Total Liabilities and Equity	$ 11,468	$ 10,939