Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 282	$ 392
Receivables (net of allowance for doubtful accounts)	528	751
Receivables of VIEs (net of allowance for doubtful accounts)	2,089	1,893
Inventory	3,265	3,522
Regulatory assets	1,109	1,023
Other	433	458
Total current assets	7,706	8,039
Property, Plant and Equipment
Cost	125,582	121,397
Accumulated depreciation and amortization	(41,161)	(39,406)
Generation facilities to be retired, net	441	529
Net property, plant and equipment	84,862	82,520
Other Noncurrent Assets
Goodwill	19,418	19,425
Regulatory assets	13,367	12,878
Nuclear decommissioning trust funds	6,814	6,205
Investments in equity method unconsolidated affiliates	1,366	925
Other	2,792	2,769
Total other noncurrent assets	43,757	42,202
Total Assets	136,325	132,761
Current Liabilities
Accounts payable	2,645	2,994
Notes payable and commercial paper	1,899	2,487
Taxes accrued	627	384
Interest accrued	538	503
Current maturities of long-term debt	2,485	2,319
Asset retirement obligations	619	411
Regulatory liabilities	273	409
Other	1,734	2,044
Total current liabilities	10,820	11,551
Long-Term Debt	48,929	45,576
Other Noncurrent Liabilities
Deferred income taxes	15,058	14,155
Asset retirement obligations	9,586	10,200
Regulatory liabilities	7,027	6,881
Accrued pension and other post-retirement benefit costs	1,105	1,111
Investment tax credits	534	493
Other	1,624	1,753
Total other noncurrent liabilities	34,934	34,593
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	38,774	38,741
Retained earnings	2,936	2,384
Accumulated other comprehensive loss	(80)	(93)
Total Parent stockholders' equity	41,631	41,033
Noncontrolling interests	11	8
Total equity	41,642	41,041
Total Liabilities and Equity	136,325	132,761
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	18	14
Receivables (net of allowance for doubtful accounts)	180	160
Receivables of VIEs (net of allowance for doubtful accounts)	691	645
Receivables from affiliated companies	146	163
Notes receivable from affiliated companies		66
Inventory	1,000	1,055
Regulatory assets	237	238
Other	27	37
Total current assets	2,299	2,378
Property, Plant and Equipment
Cost	42,321	41,127
Accumulated depreciation and amortization	(14,969)	(14,365)
Net property, plant and equipment	27,352	26,762
Other Noncurrent Assets
Regulatory assets	3,077	3,159
Nuclear decommissioning trust funds	3,621	3,273
Other	910	943
Total other noncurrent assets	7,608	7,375
Total Assets	37,259	36,515
Current Liabilities
Accounts payable	726	833
Accounts payable to affiliated companies	159	247
Notes payable to affiliated companies	468
Taxes accrued	368	143
Interest accrued	135	102
Current maturities of long-term debt	705	116
Asset retirement obligations	304	222
Regulatory liabilities	105	161
Other	435	468
Total current liabilities	3,405	2,292
Long-Term Debt	8,520	9,187
Long-Term Debt Payable to Affiliated Companies	300	300
Other Noncurrent Liabilities
Deferred income taxes	6,796	6,544
Asset retirement obligations	3,297	3,673
Regulatory liabilities	2,884	2,840
Accrued pension and other post-retirement benefit costs	108	97
Investment tax credits	234	203
Other	559	607
Total other noncurrent liabilities	13,878	13,964
Commitments and Contingencies
Equity
Member's equity	11,164	10,781
Accumulated other comprehensive loss	(8)	(9)
Total member's equity	11,156	10,772
Total Liabilities and Equity	37,259	36,515
Progress Energy [Member]
Current Assets
Cash and cash equivalents	30	46
Receivables (net of allowance for doubtful accounts)	93	114
Receivables of VIEs (net of allowance for doubtful accounts)	900	692
Receivables from affiliated companies		106
Notes receivable from affiliated companies	170	80
Inventory	1,584	1,717
Regulatory assets	440	401
Other	243	148
Total current assets	3,460	3,304
Property, Plant and Equipment
Cost	46,659	44,864
Accumulated depreciation and amortization	(15,760)	(15,212)
Generation facilities to be retired, net	441	529
Net property, plant and equipment	31,340	30,181
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets	6,438	5,722
Nuclear decommissioning trust funds	3,194	2,932
Other	909	856
Total other noncurrent assets	14,196	13,165
Total Assets	48,996	46,650
Current Liabilities
Accounts payable	1,015	1,003
Accounts payable to affiliated companies	289	348
Notes payable to affiliated companies	576	729
Taxes accrued	227	83
Interest accrued	216	201
Current maturities of long-term debt	770	778
Asset retirement obligations	250	189
Regulatory liabilities	121	189
Other	652	745
Total current liabilities	4,116	4,265
Long-Term Debt	16,717	15,590
Long-Term Debt Payable to Affiliated Companies	150	1,173
Other Noncurrent Liabilities
Deferred income taxes	6,463	5,246
Asset retirement obligations	5,189	5,286
Regulatory liabilities	2,511	2,395
Accrued pension and other post-retirement benefit costs	535	547
Other	298	341
Total other noncurrent liabilities	14,996	13,815
Commitments and Contingencies
Equity
Additional paid-in capital	9,143	8,094
Retained earnings	3,906	3,764
Accumulated other comprehensive loss	(26)	(38)
Total Parent stockholders' equity	13,023	11,820
Noncontrolling interests	(6)	(13)
Total equity	13,017	11,807
Total Liabilities and Equity	48,996	46,650
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	15	11
Receivables (net of allowance for doubtful accounts)	29	51
Receivables of VIEs (net of allowance for doubtful accounts)	472	404
Receivables from affiliated companies	8	5
Notes receivable from affiliated companies	101	165
Inventory	1,018	1,076
Regulatory assets	230	188
Other	40	57
Total current assets	1,913	1,957
Property, Plant and Equipment
Cost	29,104	28,419
Accumulated depreciation and amortization	(10,793)	(10,561)
Generation facilities to be retired, net	441	529
Net property, plant and equipment	18,752	18,387
Other Noncurrent Assets
Regulatory assets	3,588	3,243
Nuclear decommissioning trust funds	2,463	2,217
Other	565	525
Total other noncurrent assets	6,616	5,985
Total Assets	27,281	26,329
Current Liabilities
Accounts payable	271	589
Accounts payable to affiliated companies	207	227
Taxes accrued	137	104
Interest accrued	91	102
Current maturities of long-term debt	203	452
Asset retirement obligations	250	189
Regulatory liabilities	107	158
Other	318	365
Total current liabilities	1,584	2,186
Long-Term Debt	7,204	6,409
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	3,606	3,323
Asset retirement obligations	4,426	4,508
Regulatory liabilities	2,097	1,946
Accrued pension and other post-retirement benefit costs	246	252
Investment tax credits	144	146
Other	44	51
Total other noncurrent liabilities	10,563	10,226
Commitments and Contingencies
Equity
Total member's equity	7,780	7,358
Total Liabilities and Equity	27,281	26,329
Duke Energy Florida [Member]
Current Assets
Cash and cash equivalents	8	16
Receivables (net of allowance for doubtful accounts)	61	61
Receivables of VIEs (net of allowance for doubtful accounts)	428	288
Receivables from affiliated companies		5
Notes receivable from affiliated companies	70
Inventory	566	641
Regulatory assets	211	213
Other	154	125
Total current assets	1,498	1,349
Property, Plant and Equipment
Cost	17,546	16,434
Accumulated depreciation and amortization	(4,960)	(4,644)
Net property, plant and equipment	12,586	11,790
Other Noncurrent Assets
Regulatory assets	2,850	2,480
Nuclear decommissioning trust funds	731	715
Other	293	278
Total other noncurrent assets	3,874	3,473
Total Assets	17,958	16,612
Current Liabilities
Accounts payable	744	413
Accounts payable to affiliated companies	90	125
Notes payable to affiliated companies		297
Taxes accrued	143	33
Interest accrued	71	49
Current maturities of long-term debt	567	326
Regulatory liabilities	14	31
Other	310	352
Total current liabilities	1,939	1,626
Long-Term Debt	6,129	5,799
Other Noncurrent Liabilities
Deferred income taxes	3,076	2,694
Asset retirement obligations	763	778
Regulatory liabilities	414	448
Accrued pension and other post-retirement benefit costs	257	262
Other	106	105
Total other noncurrent liabilities	4,616	4,287
Commitments and Contingencies
Equity
Member's equity	5,270	4,899
Accumulated other comprehensive loss	4	1
Total member's equity	5,274	4,900
Total Liabilities and Equity	17,958	16,612
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	7	13
Receivables (net of allowance for doubtful accounts)	68	71
Receivables from affiliated companies	81	129
Notes receivable from affiliated companies	87	94
Inventory	139	137
Regulatory assets	57	37
Other	18	37
Total current assets	457	518
Property, Plant and Equipment
Cost	8,509	8,126
Accumulated depreciation and amortization	(2,658)	(2,579)
Net property, plant and equipment	5,851	5,547
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets	510	520
Other	27	23
Total other noncurrent assets	1,457	1,463
Total Assets	7,765	7,528
Current Liabilities
Accounts payable	251	282
Accounts payable to affiliated companies	59	63
Notes payable to affiliated companies		16
Taxes accrued	157	178
Interest accrued	33	19
Current maturities of long-term debt		1
Asset retirement obligations	6
Regulatory liabilities	15	21
Other	74	91
Total current liabilities	595	671
Long-Term Debt	2,042	1,858
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	1,512	1,443
Asset retirement obligations	75	77
Regulatory liabilities	232	236
Accrued pension and other post-retirement benefit costs	52	56
Other	134	166
Total other noncurrent liabilities	2,005	1,978
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	2,670	2,695
Retained earnings	(334)	(461)
Total Parent stockholders' equity	3,098	2,996
Total Liabilities and Equity	7,765	7,528
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	22	17
Receivables (net of allowance for doubtful accounts)	74	105
Receivables from affiliated companies	83	114
Notes receivable from affiliated companies	29	86
Inventory	450	504
Regulatory assets	158	149
Other	34	45
Total current assets	850	1,020
Property, Plant and Equipment
Cost	14,716	14,241
Accumulated depreciation and amortization	(4,592)	(4,317)
Net property, plant and equipment	10,124	9,924
Other Noncurrent Assets
Regulatory assets	1,123	1,073
Other	170	147
Total other noncurrent assets	1,293	1,220
Total Assets	12,267	12,164
Current Liabilities
Accounts payable	188	263
Accounts payable to affiliated companies	73	74
Taxes accrued	146	31
Interest accrued	54	61
Current maturities of long-term debt	3	3
Asset retirement obligations	58
Regulatory liabilities	28	40
Other	111	93
Total current liabilities	661	565
Long-Term Debt	3,632	3,633
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	1,979	1,900
Asset retirement obligations	735	866
Regulatory liabilities	735	748
Accrued pension and other post-retirement benefit costs	78	71
Investment tax credits	147	137
Other	65	27
Total other noncurrent liabilities	3,739	3,749
Commitments and Contingencies
Equity
Total member's equity	4,085	4,067
Total Liabilities and Equity	12,267	12,164
Piedmont Natural Gas [Member]
Current Assets
Cash and cash equivalents	12	25
Receivables (net of allowance for doubtful accounts)	77	232
Receivables from affiliated companies	8	7
Inventory	53	66
Regulatory assets	133	124
Income taxes receivable	99	9
Other	31	12
Total current assets	413	475
Property, Plant and Equipment
Cost	6,579	6,174
Accumulated depreciation and amortization	(1,454)	(1,360)
Net property, plant and equipment	5,125	4,814
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets	322	373
Investments in equity method unconsolidated affiliates	76	212
Other	11	21
Total other noncurrent assets	458	655
Total Assets	5,996	5,944
Current Liabilities
Accounts payable	98	155
Accounts payable to affiliated companies	7	8
Notes payable and commercial paper		330
Notes payable to affiliated companies	284
Taxes accrued	30	67
Interest accrued	24	33
Current maturities of long-term debt		35
Regulatory liabilities	3
Other	72	102
Total current liabilities	518	730
Long-Term Debt	2,036	1,786
Other Noncurrent Liabilities
Deferred income taxes	1,046	931
Asset retirement obligations	15	14
Regulatory liabilities	627	608
Accrued pension and other post-retirement benefit costs	14	14
Other	141	189
Total other noncurrent liabilities	1,843	1,756
Commitments and Contingencies
Equity
Common stock	860	860
Retained earnings	739	812
Total Parent stockholders' equity	1,599	1,672
Total Liabilities and Equity	$ 5,996	$ 5,944