Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current Assets [Abstract]
Cash and cash equivalents	$ 392	$ 383
Receivables (net of allowance for doubtful accounts)	751	515
Receivables of VIEs (net of allowance for doubtful accounts)	1,893	1,748
Inventory	3,522	3,746
Assets held for sale		746
Regulatory assets	1,023	877
Other	458	307
Total current assets	8,039	8,322
Investments and Other Assets [Abstract]
Investments in equity method unconsolidated affiliates	925	499
Nuclear decommissioning trust funds	6,205	5,825
Goodwill	19,425	16,072
Assets held for sale		2,413
Other	2,752	2,830
Total investments and other assets	29,307	27,639
Property, Plant and Equipment [Abstract]
Cost	121,397	109,967
Accumulated depreciation and amortization	(39,406)	(36,736)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	82,520	73,779
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	12,878	11,373
Other	17	43
Total regulatory assets and deferred debits	12,895	11,416
Total Assets	132,761	121,156
Current Liabilities [Abstract]
Accounts payable	2,994	2,350
Notes payable and commercial paper	2,487	3,633
Taxes accrued	384	289
Interest accrued	503	412
Current maturities of long-term debt	2,319	2,026
Liabilities associated with assets held for sale		279
Asset retirement obligations	411
Regulatory liabilities	409	400
Other	2,044	2,011
Total current liabilities	11,551	11,400
Long-Term Debt	45,576	36,842
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	14,155	12,548
Investment tax credits	493	472
Accrued pension and other post-retirement benefit costs	1,111	1,088
Liabilities associated with assets held for sale		900
Asset retirement obligations	10,200	10,249
Regulatory liabilities	6,881	6,255
Other	1,753	1,631
Total deferred credits and other liabilities	34,593	33,143
Commitments and Contingencies
Equity [Abstract]
Common stock	1	1
Additional paid-in capital	38,741	37,968
Retained earnings	2,384	2,564
Accumulated other comprehensive (loss) income	(93)	(806)
Total Duke Energy Corporation stockholders' equity	41,033	39,727
Noncontrolling interests	8	44
Total equity	41,041	39,771
Total Liabilities and Equity	132,761	121,156
Duke Energy Carolinas [Member]
Current Assets [Abstract]
Cash and cash equivalents	14	13
Receivables (net of allowance for doubtful accounts)	160	142
Receivables of VIEs (net of allowance for doubtful accounts)	645	596
Receivables from affiliated companies	163	107
Notes receivable from affiliated companies	66	163
Inventory	1,055	1,276
Regulatory assets	238	305
Other	37	128
Total current assets	2,378	2,730
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	3,273	3,050
Other	940	999
Total investments and other assets	4,213	4,049
Property, Plant and Equipment [Abstract]
Cost	41,127	39,398
Accumulated depreciation and amortization	(14,365)	(13,521)
Net property, plant and equipment	26,762	25,877
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	3,159	2,766
Other	3	4
Total regulatory assets and deferred debits	3,162	2,770
Total Assets	36,515	35,426
Current Liabilities [Abstract]
Accounts payable	833	753
Accounts payable to affiliated companies	247	229
Taxes accrued	143	25
Interest accrued	102	95
Current maturities of long-term debt	116	356
Asset retirement obligations	222
Regulatory liabilities	161	39
Other	468	519
Total current liabilities	2,292	2,016
Long-Term Debt	9,187	7,711
Long-Term Debt Payable to Affiliated Companies	300	300
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	6,544	6,146
Investment tax credits	203	199
Accrued pension and other post-retirement benefit costs	97	107
Asset retirement obligations	3,673	3,918
Regulatory liabilities	2,840	2,802
Other	607	621
Total deferred credits and other liabilities	13,964	13,793
Commitments and Contingencies
Equity [Abstract]
Members' Equity	10,781	11,617
Accumulated other comprehensive (loss) income	(9)	(11)
Total equity	10,772	11,606
Total Liabilities and Equity	36,515	35,426
Progress Energy [Member]
Current Assets [Abstract]
Cash and cash equivalents	46	44
Receivables (net of allowance for doubtful accounts)	114	151
Receivables of VIEs (net of allowance for doubtful accounts)	692	658
Receivables from affiliated companies	106	375
Notes receivable from affiliated companies	80
Inventory	1,717	1,751
Regulatory assets	401	362
Other	148	156
Total current assets	3,304	3,497
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,932	2,775
Goodwill	3,655	3,655
Other	852	834
Total investments and other assets	7,439	7,264
Property, Plant and Equipment [Abstract]
Cost	44,864	42,666
Accumulated depreciation and amortization	(15,212)	(14,867)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	30,181	28,347
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	5,722	5,435
Other	4	5
Total regulatory assets and deferred debits	5,726	5,440
Total Assets	46,650	44,548
Current Liabilities [Abstract]
Accounts payable	1,003	722
Accounts payable to affiliated companies	348	311
Notes payable to affiliated companies	729	1,308
Taxes accrued	83	53
Interest accrued	201	195
Current maturities of long-term debt	778	315
Asset retirement obligations	189
Regulatory liabilities	189	286
Other	745	891
Total current liabilities	4,265	4,081
Long-Term Debt	15,590	13,999
Long-Term Debt Payable to Affiliated Companies	1,173	150
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	5,246	4,790
Accrued pension and other post-retirement benefit costs	547	536
Asset retirement obligations	5,286	5,369
Regulatory liabilities	2,395	2,387
Other	341	383
Total deferred credits and other liabilities	13,815	13,465
Commitments and Contingencies
Equity [Abstract]
Additional paid-in capital	8,094	8,092
Retained earnings	3,764	4,831
Accumulated other comprehensive (loss) income	(38)	(48)
Total Duke Energy Corporation stockholders' equity	11,820	12,875
Noncontrolling interests	(13)	(22)
Total equity	11,807	12,853
Total Liabilities and Equity	46,650	44,548
Duke Energy Progress [Member]
Current Assets [Abstract]
Cash and cash equivalents	11	15
Receivables (net of allowance for doubtful accounts)	51	87
Receivables of VIEs (net of allowance for doubtful accounts)	404	349
Receivables from affiliated companies	5	16
Notes receivable from affiliated companies	165
Inventory	1,076	1,088
Regulatory assets	188	264
Other	57	121
Total current assets	1,957	1,940
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	2,217	2,035
Other	523	486
Total investments and other assets	2,740	2,521
Property, Plant and Equipment [Abstract]
Cost	28,419	27,313
Accumulated depreciation and amortization	(10,561)	(10,141)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	18,387	17,720
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	3,243	2,710
Other	2	3
Total regulatory assets and deferred debits	3,245	2,713
Total Assets	26,329	24,894
Current Liabilities [Abstract]
Accounts payable	589	399
Accounts payable to affiliated companies	227	190
Notes payable to affiliated companies	0	209
Taxes accrued	104	15
Interest accrued	102	96
Current maturities of long-term debt	452	2
Asset retirement obligations	189
Regulatory liabilities	158	85
Other	365	412
Total current liabilities	2,186	1,408
Long-Term Debt	6,409	6,366
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	3,323	3,027
Investment tax credits	146	132
Accrued pension and other post-retirement benefit costs	252	262
Asset retirement obligations	4,508	4,567
Regulatory liabilities	1,946	1,878
Other	51	45
Total deferred credits and other liabilities	10,226	9,911
Equity [Abstract]
Total equity	7,358	7,059
Total Liabilities and Equity	26,329	24,894
Duke Energy Florida [Member]
Current Assets [Abstract]
Cash and cash equivalents	16	8
Receivables (net of allowance for doubtful accounts)	61	60
Receivables of VIEs (net of allowance for doubtful accounts)	288	308
Receivables from affiliated companies	5	84
Inventory	641	663
Regulatory assets	213	98
Other	125	21
Total current assets	1,349	1,242
Investments and Other Assets [Abstract]
Nuclear decommissioning trust funds	715	740
Other	276	292
Total investments and other assets	991	1,032
Property, Plant and Equipment [Abstract]
Cost	16,434	15,343
Accumulated depreciation and amortization	(4,644)	(4,720)
Net property, plant and equipment	11,790	10,623
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	2,480	2,725
Other	2	2
Total regulatory assets and deferred debits	2,482	2,727
Total Assets	16,612	15,624
Current Liabilities [Abstract]
Accounts payable	413	322
Accounts payable to affiliated companies	125	116
Notes payable to affiliated companies	297	813
Taxes accrued	33	132
Interest accrued	49	43
Current maturities of long-term debt	326	13
Regulatory liabilities	31	200
Other	352	452
Total current liabilities	1,626	2,091
Long-Term Debt	5,799	4,253
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	2,694	2,460
Accrued pension and other post-retirement benefit costs	262	242
Asset retirement obligations	778	802
Regulatory liabilities	448	509
Other	105	146
Total deferred credits and other liabilities	4,287	4,159
Equity [Abstract]
Members' Equity	4,899	5,121
Accumulated other comprehensive (loss) income	1
Total equity	4,900	5,121
Total Liabilities and Equity	16,612	15,624
Duke Energy Ohio [Member]
Current Assets [Abstract]
Cash and cash equivalents	13	14
Receivables (net of allowance for doubtful accounts)	71	66
Receivables from affiliated companies	129	84
Notes receivable from affiliated companies	94
Inventory	137	105
Regulatory assets	37	36
Other	37	110
Total current assets	518	415
Investments and Other Assets [Abstract]
Goodwill	920	920
Other	21	20
Total investments and other assets	941	940
Property, Plant and Equipment [Abstract]
Cost	8,126	7,750
Accumulated depreciation and amortization	(2,579)	(2,507)
Net property, plant and equipment	5,547	5,243
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	520	497
Other	2	2
Total regulatory assets and deferred debits	522	499
Total Assets	7,528	7,097
Current Liabilities [Abstract]
Accounts payable	282	207
Accounts payable to affiliated companies	63	53
Notes payable to affiliated companies	16	103
Taxes accrued	178	171
Interest accrued	19	18
Current maturities of long-term debt	1	106
Regulatory liabilities	21	12
Other	91	153
Total current liabilities	671	823
Long-Term Debt	1,858	1,467
Long-Term Debt Payable to Affiliated Companies	25	25
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,443	1,407
Accrued pension and other post-retirement benefit costs	56	56
Asset retirement obligations	77	125
Regulatory liabilities	236	245
Other	166	165
Total deferred credits and other liabilities	1,978	1,998
Equity [Abstract]
Common stock	762	762
Additional paid-in capital	2,695	2,720
Retained earnings	(461)	(698)
Total equity	2,996	2,784
Total Liabilities and Equity	7,528	7,097
Duke Energy Indiana [Member]
Current Assets [Abstract]
Cash and cash equivalents	17	9
Receivables (net of allowance for doubtful accounts)	105	96
Receivables from affiliated companies	114	71
Notes receivable from affiliated companies	86	83
Inventory	504	570
Regulatory assets	149	102
Other	45	15
Total current assets	1,020	946
Investments and Other Assets [Abstract]
Total investments and other assets	145	212
Property, Plant and Equipment [Abstract]
Cost	14,241	14,007
Accumulated depreciation and amortization	(4,317)	(4,484)
Net property, plant and equipment	9,924	9,523
Regulatory Assets and Deferred Debits [Abstract]
Regulatory assets	1,073	716
Other	2	2
Total regulatory assets and deferred debits	1,075	718
Total Assets	12,164	11,399
Current Liabilities [Abstract]
Accounts payable	263	189
Accounts payable to affiliated companies	74	83
Notes payable to affiliated companies		0
Taxes accrued	31	89
Interest accrued	61	56
Current maturities of long-term debt	3	547
Regulatory liabilities	40	62
Other	93	97
Total current liabilities	565	1,123
Long-Term Debt	3,633	3,071
Long-Term Debt Payable to Affiliated Companies	150	150
Deferred Credits and Other Liabilities [Abstract]
Deferred income taxes	1,900	1,657
Investment tax credits	137	138
Accrued pension and other post-retirement benefit costs	71	80
Asset retirement obligations	866	525
Regulatory liabilities	748	754
Other	27	65
Total deferred credits and other liabilities	3,749	3,219
Equity [Abstract]
Members' Equity	4,067
Common stock		1
Additional paid-in capital		1,384
Retained earnings		2,450
Accumulated other comprehensive (loss) income		1
Total equity	4,067
Total equity		3,836
Total Liabilities and Equity	$ 12,164	$ 11,399