Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 778	$ 857
Receivables (net of allowance for doubtful accounts)	609	703
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	1,714	1,748
Inventory	3,721	3,810
Regulatory assets	813	877
Other	308	327
Total current assets	7,943	8,322
Investments and Other Assets
Investments in equity method unconsolidated affiliates	547	499
Nuclear decommissioning trust funds	5,880	5,825
Goodwill	16,349	16,343
Other	3,036	3,042
Total investments and other assets	25,812	25,709
Property, Plant and Equipment
Cost	113,942	112,826
Accumulated depreciation and amortization	(38,154)	(37,665)
Generation facilities to be retired, net	644	548
Net property, plant and equipment	76,432	75,709
Regulatory Assets and Deferred Debits
Regulatory assets	11,483	11,373
Other	39	43
Total regulatory assets and deferred debits	11,522	11,416
Total Assets	121,709	121,156
Current Liabilities
Accounts payable	2,086	2,400
Notes payable and commercial paper	3,486	3,633
Taxes accrued	394	348
Interest accrued	481	430
Current maturities of long-term debt	2,075	2,074
Regulatory liabilities	404	400
Other	1,965	2,115
Total current liabilities	10,891	11,400
Long-Term Debt	38,232	37,495
Deferred Credits and Other Liabilities
Deferred income taxes	12,825	12,705
Investment tax credits	493	472
Accrued pension and other post-retirement benefit costs	1,077	1,088
Asset retirement obligations	10,269	10,264
Regulatory liabilities	6,278	6,255
Other	1,703	1,706
Total deferred credits and other liabilities	$ 32,645	$ 32,490
Commitments and Contingencies
Equity
Common stock	$ 1	$ 1
Additional paid-in capital	37,969	37,968
Retained earnings	2,688	2,564
Accumulated other comprehensive income (loss)	(766)	(806)
Total Duke Energy Corporation stockholders' equity	39,892	39,727
Noncontrolling interests	49	44
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	39,941	39,771
Total Liabilities and Equity	121,709	121,156
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	17	13
Receivables (net of allowance for doubtful accounts)	129	142
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	615	596
Receivables from affiliated companies	74	107
Notes receivable from affiliated companies	854	163
Inventory	1,236	1,276
Regulatory assets	269	305
Other	32	128
Total current assets	3,226	2,730
Investments and Other Assets
Nuclear decommissioning trust funds	3,081	3,050
Other	1,003	999
Total investments and other assets	4,084	4,049
Property, Plant and Equipment
Cost	39,833	39,398
Accumulated depreciation and amortization	(13,769)	(13,521)
Net property, plant and equipment	26,064	25,877
Regulatory Assets and Deferred Debits
Regulatory assets	2,801	2,766
Other	4	4
Total regulatory assets and deferred debits	2,805	2,770
Total Assets	36,179	35,426
Current Liabilities
Accounts payable	597	753
Accounts payable to affiliated companies	250	229
Taxes accrued	76	25
Interest accrued	134	95
Current maturities of long-term debt	468	356
Regulatory liabilities	48	39
Other	452	519
Total current liabilities	2,025	2,016
Long-Term Debt	8,592	7,711
Long-Term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities
Deferred income taxes	6,298	6,146
Investment tax credits	197	199
Accrued pension and other post-retirement benefit costs	105	107
Asset retirement obligations	3,913	3,918
Regulatory liabilities	2,829	2,802
Other	642	621
Total deferred credits and other liabilities	$ 13,984	$ 13,793
Commitments and Contingencies
Equity
Member's equity	$ 11,288	$ 11,617
Accumulated other comprehensive income (loss)	(10)	(11)
Members' Equity	11,278	11,606
Total Liabilities and Equity	36,179	35,426
Progress Energy [Member]
Current Assets
Cash and cash equivalents	41	44
Receivables (net of allowance for doubtful accounts)	110	151
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	627	658
Receivables from affiliated companies	37	375
Inventory	1,748	1,751
Regulatory assets	333	362
Other	237	156
Total current assets	3,133	3,497
Investments and Other Assets
Nuclear decommissioning trust funds	2,798	2,775
Goodwill	3,655	3,655
Other	876	834
Total investments and other assets	7,329	7,264
Property, Plant and Equipment
Cost	43,166	42,666
Accumulated depreciation and amortization	(15,008)	(14,867)
Generation facilities to be retired, net	531	548
Net property, plant and equipment	28,689	28,347
Regulatory Assets and Deferred Debits
Regulatory assets	5,498	5,435
Other	5	5
Total regulatory assets and deferred debits	5,503	5,440
Total Assets	44,654	44,548
Current Liabilities
Accounts payable	666	722
Accounts payable to affiliated companies	256	311
Notes payable to affiliated companies	1,436	1,308
Taxes accrued	95	53
Interest accrued	185	195
Current maturities of long-term debt	265	315
Regulatory liabilities	279	286
Other	861	891
Total current liabilities	4,043	4,081
Long-Term Debt	13,795	13,999
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	4,937	4,790
Accrued pension and other post-retirement benefit costs	533	536
Asset retirement obligations	5,372	5,369
Regulatory liabilities	2,386	2,387
Other	371	383
Total deferred credits and other liabilities	$ 13,599	$ 13,465
Commitments and Contingencies
Equity
Additional paid-in capital	$ 8,092	$ 8,092
Retained earnings	5,040	4,831
Accumulated other comprehensive income (loss)	(45)	(48)
Total Duke Energy Corporation stockholders' equity	13,087	12,875
Noncontrolling interests	(20)	(22)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	13,067	12,853
Total Liabilities and Equity	44,654	44,548
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	11	15
Receivables (net of allowance for doubtful accounts)	47	87
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	372	349
Receivables from affiliated companies	6	16
Inventory	1,074	1,088
Regulatory assets	222	264
Other	51	121
Total current assets	1,783	1,940
Investments and Other Assets
Nuclear decommissioning trust funds	2,068	2,035
Other	521	486
Total investments and other assets	2,589	2,521
Property, Plant and Equipment
Cost	27,503	27,313
Accumulated depreciation and amortization	(10,266)	(10,141)
Generation facilities to be retired, net	531	548
Net property, plant and equipment	17,768	17,720
Regulatory Assets and Deferred Debits
Regulatory assets	2,768	2,710
Other	2	3
Total regulatory assets and deferred debits	2,770	2,713
Total Assets	24,910	24,894
Current Liabilities
Accounts payable	295	399
Accounts payable to affiliated companies	176	190
Notes payable to affiliated companies	108	209
Taxes accrued	33	15
Interest accrued	80	96
Current maturities of long-term debt	252	2
Regulatory liabilities	93	85
Other	382	412
Total current liabilities	1,419	1,408
Long-Term Debt	6,163	6,366
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	3,089	3,027
Investment tax credits	154	132
Accrued pension and other post-retirement benefit costs	261	262
Asset retirement obligations	4,573	4,567
Regulatory liabilities	1,876	1,878
Other	29	45
Total deferred credits and other liabilities	$ 9,982	$ 9,911
Commitments and Contingencies
Equity
Member's equity	$ 7,196	$ 7,059
Members' Equity	7,196	7,059
Total Liabilities and Equity	24,910	24,894
Duke Energy Florida [Member]
Current Assets
Cash and cash equivalents	12	8
Receivables (net of allowance for doubtful accounts)	61	60
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	256	308
Receivables from affiliated companies	27	84
Inventory	674	663
Regulatory assets	111	98
Other	52	21
Total current assets	1,193	1,242
Investments and Other Assets
Nuclear decommissioning trust funds	730	740
Other	301	292
Total investments and other assets	1,031	1,032
Property, Plant and Equipment
Cost	15,652	15,343
Accumulated depreciation and amortization	(4,734)	(4,720)
Net property, plant and equipment	10,918	10,623
Regulatory Assets and Deferred Debits
Regulatory assets	2,730	2,725
Other	2	2
Total regulatory assets and deferred debits	2,732	2,727
Total Assets	15,874	15,624
Current Liabilities
Accounts payable	371	322
Accounts payable to affiliated companies	76	116
Notes payable to affiliated companies	948	813
Taxes accrued	62	132
Interest accrued	59	43
Current maturities of long-term debt	13	13
Regulatory liabilities	186	200
Other	451	452
Total current liabilities	2,166	2,091
Long-Term Debt	4,252	4,253
Deferred Credits and Other Liabilities
Deferred income taxes	2,544	2,460
Accrued pension and other post-retirement benefit costs	240	242
Asset retirement obligations	799	802
Regulatory liabilities	509	509
Other	132	146
Total deferred credits and other liabilities	$ 4,224	$ 4,159
Commitments and Contingencies
Equity
Member's equity	$ 5,231	$ 5,121
Accumulated other comprehensive income (loss)	1
Members' Equity	5,232	5,121
Total Liabilities and Equity	15,874	15,624
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	19	14
Receivables (net of allowance for doubtful accounts)	85	66
Receivables from affiliated companies	93	84
Notes receivable from affiliated companies	19
Inventory	105	105
Regulatory assets	26	36
Other	32	110
Total current assets	379	415
Investments and Other Assets
Goodwill	920	920
Other	20	20
Total investments and other assets	940	940
Property, Plant and Equipment
Cost	7,803	7,750
Accumulated depreciation and amortization	(2,515)	(2,507)
Net property, plant and equipment	5,288	5,243
Regulatory Assets and Deferred Debits
Regulatory assets	503	497
Other	2	2
Total regulatory assets and deferred debits	505	499
Total Assets	7,112	7,097
Current Liabilities
Accounts payable	211	207
Accounts payable to affiliated companies	53	53
Notes payable to affiliated companies	8	103
Taxes accrued	141	171
Interest accrued	29	18
Current maturities of long-term debt	55	106
Regulatory liabilities	18	12
Other	151	153
Total current liabilities	666	823
Long-Term Debt	1,562	1,467
Long-Term Debt Payable to Affiliated Companies	25	25
Deferred Credits and Other Liabilities
Deferred income taxes	1,427	1,407
Accrued pension and other post-retirement benefit costs	55	56
Asset retirement obligations	125	125
Regulatory liabilities	245	245
Other	164	165
Total deferred credits and other liabilities	$ 2,016	$ 1,998
Commitments and Contingencies
Equity
Common stock	$ 762	$ 762
Additional paid-in capital	2,720	2,720
Retained earnings	(639)	(698)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,843	2,784
Total Liabilities and Equity	7,112	7,097
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	17	9
Receivables (net of allowance for doubtful accounts)	82	96
Receivables from affiliated companies	64	71
Notes receivable from affiliated companies	102	83
Inventory	525	570
Regulatory assets	114	102
Other	16	15
Total current assets	920	946
Investments and Other Assets
Total investments and other assets	208	212
Property, Plant and Equipment
Cost	13,864	14,007
Accumulated depreciation and amortization	(4,472)	(4,484)
Generation facilities to be retired, net	113
Net property, plant and equipment	9,505	9,523
Regulatory Assets and Deferred Debits
Regulatory assets	766	716
Other	2	2
Total regulatory assets and deferred debits	768	718
Total Assets	11,401	11,399
Current Liabilities
Accounts payable	124	189
Accounts payable to affiliated companies	61	83
Taxes accrued	119	89
Interest accrued	51	56
Current maturities of long-term debt	547	547
Regulatory liabilities	60	62
Other	78	97
Total current liabilities	1,040	1,123
Long-Term Debt	3,071	3,071
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities
Deferred income taxes	1,650	1,657
Investment tax credits	138	138
Accrued pension and other post-retirement benefit costs	78	80
Asset retirement obligations	525	525
Regulatory liabilities	759	754
Other	60	65
Total deferred credits and other liabilities	$ 3,210	$ 3,219
Commitments and Contingencies
Equity
Member's equity	$ 3,930
Common stock		$ 1
Additional paid-in capital		1,384
Retained earnings		2,450
Accumulated other comprehensive income (loss)		1
Members' Equity	3,930
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		3,836
Total Liabilities and Equity	$ 11,401	$ 11,399