Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 298	$ 392
Receivables (net of allowance for doubtful accounts)	498	751
Receivables of VIEs (net of allowance for doubtful accounts)	1,880	1,893
Inventory	3,369	3,522
Regulatory assets	1,192	1,023
Other	436	458
Total current assets	7,673	8,039
Property, Plant and Equipment
Cost	124,439	121,397
Accumulated depreciation and amortization	(40,522)	(39,406)
Generation facilities to be retired, net	487	529
Net property, plant and equipment	84,404	82,520
Other Noncurrent Assets
Goodwill	19,425	19,425
Regulatory assets	12,808	12,878
Nuclear decommissioning trust funds	6,601	6,205
Investments in equity method unconsolidated affiliates	1,267	925
Other	2,826	2,769
Total other noncurrent assets	42,927	42,202
Total Assets	135,004	132,761
Current Liabilities
Accounts payable	2,177	2,994
Notes payable and commercial paper	3,488	2,487
Taxes accrued	432	384
Interest accrued	506	503
Current maturities of long-term debt	3,472	2,319
Asset retirement obligation	397	411
Regulatory liabilities	286	409
Other	1,708	2,044
Total current liabilities	12,466	11,551
Long-Term Debt	46,043	45,576
Other Noncurrent Liabilities
Deferred income taxes	14,695	14,155
Asset retirement obligations	10,165	10,200
Regulatory liabilities	7,048	6,881
Accrued pension and other post-retirement benefit costs	1,108	1,111
Investment tax credits	534	493
Other	1,651	1,753
Total other noncurrent liabilities	35,201	34,593
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	38,758	38,741
Retained earnings	2,607	2,384
Accumulated other comprehensive loss	(82)	(93)
Total Parent stockholders' equity	41,284	41,033
Noncontrolling interests	10	8
Total equity	41,294	41,041
Total Liabilities and Equity	135,004	132,761
Duke Energy Carolinas [Member]
Current Assets
Cash and cash equivalents	16	14
Receivables (net of allowance for doubtful accounts)	165	160
Receivables of VIEs (net of allowance for doubtful accounts)	611	645
Receivables from affiliated companies	85	163
Notes receivable from affiliated companies		66
Inventory	1,066	1,055
Regulatory assets	249	238
Other	34	37
Total current assets	2,226	2,378
Property, Plant and Equipment
Cost	41,881	41,127
Accumulated depreciation and amortization	(14,632)	(14,365)
Net property, plant and equipment	27,249	26,762
Other Noncurrent Assets
Regulatory assets	3,060	3,159
Nuclear decommissioning trust funds	3,499	3,273
Other	929	943
Total other noncurrent assets	7,488	7,375
Total Assets	36,963	36,515
Current Liabilities
Accounts payable	639	833
Accounts payable to affiliated companies	127	247
Notes payable to affiliated companies	534
Taxes accrued	162	143
Interest accrued	104	102
Current maturities of long-term debt	704	116
Asset retirement obligation	227	222
Regulatory liabilities	115	161
Other	409	468
Total current liabilities	3,021	2,292
Long-Term Debt	8,520	9,187
Long-Term Debt Payable to Affiliated Companies	300	300
Other Noncurrent Liabilities
Deferred income taxes	6,742	6,544
Asset retirement obligations	3,644	3,673
Regulatory liabilities	2,885	2,840
Accrued pension and other post-retirement benefit costs	103	97
Investment tax credits	235	203
Other	574	607
Total other noncurrent liabilities	14,183	13,964
Commitments and Contingencies
Equity
Member's equity	10,947	10,781
Accumulated other comprehensive loss	(8)	(9)
Total member's equity	10,939	10,772
Total Liabilities and Equity	36,963	36,515
Progress Energy [Member]
Current Assets
Cash and cash equivalents	39	46
Receivables (net of allowance for doubtful accounts)	95	114
Receivables of VIEs (net of allowance for doubtful accounts)	777	692
Receivables from affiliated companies	3	106
Notes receivable from affiliated companies	140	80
Inventory	1,621	1,717
Regulatory assets	533	401
Other	196	148
Total current assets	3,404	3,304
Property, Plant and Equipment
Cost	46,317	44,864
Accumulated depreciation and amortization	(15,652)	(15,212)
Generation facilities to be retired, net	487	529
Net property, plant and equipment	31,152	30,181
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets	5,853	5,722
Nuclear decommissioning trust funds	3,102	2,932
Other	865	856
Total other noncurrent assets	13,475	13,165
Total Assets	48,031	46,650
Current Liabilities
Accounts payable	649	1,003
Accounts payable to affiliated companies	208	348
Notes payable to affiliated companies	1,070	729
Taxes accrued	165	83
Interest accrued	228	201
Current maturities of long-term debt	1,022	778
Asset retirement obligation	170	189
Regulatory liabilities	120	189
Other	660	745
Total current liabilities	4,292	4,265
Long-Term Debt	15,950	15,590
Long-Term Debt Payable to Affiliated Companies	1,173	1,173
Other Noncurrent Liabilities
Deferred income taxes	5,662	5,246
Asset retirement obligations	5,288	5,286
Regulatory liabilities	2,511	2,395
Accrued pension and other post-retirement benefit costs	537	547
Other	321	341
Total other noncurrent liabilities	14,319	13,815
Commitments and Contingencies
Equity
Additional paid-in capital	8,096	8,094
Retained earnings	4,237	3,764
Accumulated other comprehensive loss	(28)	(38)
Total Parent stockholders' equity	12,305	11,820
Noncontrolling interests	(8)	(13)
Total equity	12,297	11,807
Total Liabilities and Equity	48,031	46,650
Duke Energy Progress [Member]
Current Assets
Cash and cash equivalents	12	11
Receivables (net of allowance for doubtful accounts)	32	51
Receivables of VIEs (net of allowance for doubtful accounts)	422	404
Receivables from affiliated companies	5	5
Notes receivable from affiliated companies		165
Inventory	1,053	1,076
Regulatory assets	212	188
Other	76	57
Total current assets	1,812	1,957
Property, Plant and Equipment
Cost	28,936	28,419
Accumulated depreciation and amortization	(10,734)	(10,561)
Generation facilities to be retired, net	487	529
Net property, plant and equipment	18,689	18,387
Other Noncurrent Assets
Regulatory assets	3,379	3,243
Nuclear decommissioning trust funds	2,380	2,217
Other	536	525
Total other noncurrent assets	6,295	5,985
Total Assets	26,796	26,329
Current Liabilities
Accounts payable	277	589
Accounts payable to affiliated companies	169	227
Notes payable to affiliated companies	633
Taxes accrued	61	104
Interest accrued	101	102
Current maturities of long-term debt	203	452
Asset retirement obligation	170	189
Regulatory liabilities	113	158
Other	308	365
Total current liabilities	2,035	2,186
Long-Term Debt	6,407	6,409
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	3,539	3,323
Asset retirement obligations	4,520	4,508
Regulatory liabilities	2,048	1,946
Accrued pension and other post-retirement benefit costs	246	252
Investment tax credits	145	146
Other	47	51
Total other noncurrent liabilities	10,545	10,226
Commitments and Contingencies
Equity
Total member's equity	7,659	7,358
Total Liabilities and Equity	26,796	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)	354	288
Receivables from affiliated companies	1	5
Notes receivable from affiliated companies	230
Inventory	568	641
Regulatory assets	321	213
Other	50	125
Total current assets	1,593	1,349
Property, Plant and Equipment
Cost	17,369	16,434
Accumulated depreciation and amortization	(4,910)	(4,644)
Net property, plant and equipment	12,459	11,790
Other Noncurrent Assets
Regulatory assets	2,474	2,480
Nuclear decommissioning trust funds	723	715
Other	279	278
Total other noncurrent assets	3,476	3,473
Total Assets	17,528	16,612
Current Liabilities
Accounts payable	372	413
Accounts payable to affiliated companies	42	125
Notes payable to affiliated companies		297
Taxes accrued	112	33
Interest accrued	58	49
Current maturities of long-term debt	819	326
Regulatory liabilities	7	31
Other	322	352
Total current liabilities	1,732	1,626
Long-Term Debt	6,160	5,799
Other Noncurrent Liabilities
Deferred income taxes	2,893	2,694
Asset retirement obligations	768	778
Regulatory liabilities	462	448
Accrued pension and other post-retirement benefit costs	258	262
Other	103	105
Total other noncurrent liabilities	4,484	4,287
Commitments and Contingencies
Equity
Member's equity	5,149	4,899
Accumulated other comprehensive loss	3	1
Total member's equity	5,152	4,900
Total Liabilities and Equity	17,528	16,612
Duke Energy Ohio [Member]
Current Assets
Cash and cash equivalents	9	13
Receivables (net of allowance for doubtful accounts)	61	71
Receivables from affiliated companies	74	129
Notes receivable from affiliated companies	63	94
Inventory	134	137
Regulatory assets	42	37
Other	38	37
Total current assets	421	518
Property, Plant and Equipment
Cost	8,348	8,126
Accumulated depreciation and amortization	(2,626)	(2,579)
Net property, plant and equipment	5,722	5,547
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets	519	520
Other	23	23
Total other noncurrent assets	1,462	1,463
Total Assets	7,605	7,528
Current Liabilities
Accounts payable	267	282
Accounts payable to affiliated companies	47	63
Notes payable to affiliated companies	24	16
Taxes accrued	100	178
Interest accrued	19	19
Current maturities of long-term debt	1	1
Regulatory liabilities	16	21
Other	77	91
Total current liabilities	551	671
Long-Term Debt	1,951	1,858
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	1,506	1,443
Asset retirement obligations	76	77
Regulatory liabilities	240	236
Accrued pension and other post-retirement benefit costs	56	56
Other	157	166
Total other noncurrent liabilities	2,035	1,978
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	2,670	2,695
Retained earnings	(389)	(461)
Total Parent stockholders' equity	3,043	2,996
Total Liabilities and Equity	7,605	7,528
Duke Energy Indiana [Member]
Current Assets
Cash and cash equivalents	17	17
Receivables (net of allowance for doubtful accounts)	45	105
Receivables from affiliated companies	87	114
Notes receivable from affiliated companies	19	86
Inventory	470	504
Regulatory assets	159	149
Other	88	45
Total current assets	885	1,020
Property, Plant and Equipment
Cost	14,573	14,241
Accumulated depreciation and amortization	(4,484)	(4,317)
Net property, plant and equipment	10,089	9,924
Other Noncurrent Assets
Regulatory assets	1,100	1,073
Other	159	147
Total other noncurrent assets	1,259	1,220
Total Assets	12,233	12,164
Current Liabilities
Accounts payable	171	263
Accounts payable to affiliated companies	50	74
Taxes accrued	28	31
Interest accrued	59	61
Current maturities of long-term debt	3	3
Regulatory liabilities	36	40
Other	122	93
Total current liabilities	469	565
Long-Term Debt	3,631	3,633
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	2,011	1,900
Asset retirement obligations	865	866
Regulatory liabilities	745	748
Accrued pension and other post-retirement benefit costs	77	71
Investment tax credits	148	137
Other	23	27
Total other noncurrent liabilities	3,869	3,749
Commitments and Contingencies
Equity
Total member's equity	4,114	4,067
Total Liabilities and Equity	12,233	12,164
Piedmont Natural Gas [Member]
Current Assets
Cash and cash equivalents	14	25
Receivables (net of allowance for doubtful accounts)	80	232
Receivables from affiliated companies	8	7
Inventory	38	66
Regulatory assets	119	124
Other	87	21
Total current assets	346	475
Property, Plant and Equipment
Cost	6,430	6,174
Accumulated depreciation and amortization	(1,424)	(1,360)
Net property, plant and equipment	5,006	4,814
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets	346	373
Investments in equity method unconsolidated affiliates	74	212
Other	12	21
Total other noncurrent assets	481	655
Total Assets	5,833	5,944
Current Liabilities
Accounts payable	105	155
Accounts payable to affiliated companies	50	8
Notes payable and commercial paper		330
Notes payable to affiliated companies	167
Taxes accrued	21	67
Interest accrued	30	33
Current maturities of long-term debt	35	35
Other	67	102
Total current liabilities	475	730
Long-Term Debt	1,911	1,786
Other Noncurrent Liabilities
Deferred income taxes	1,019	931
Asset retirement obligations	15	14
Regulatory liabilities	625	608
Accrued pension and other post-retirement benefit costs	14	14
Other	164	189
Total other noncurrent liabilities	1,837	1,756
Commitments and Contingencies
Equity
Common stock	860	860
Retained earnings	750	812
Total Parent stockholders' equity	1,610	1,672
Total Liabilities and Equity	$ 5,833	$ 5,944