Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 14,062	$ 15,018
Less: current portion	1,641	1,796
Total noncurrent regulatory assets	12,421	13,222
Total regulatory liabilities	16,406	16,048
Less: current portion	1,377	784
Total noncurrent regulatory liabilities	15,029	15,264
Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	7,368	7,872
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	5,883	5,756
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,512	1,100
Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	344	370
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	177	176
Amounts to be refunded to customers
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	51	34
Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	18	1
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,053	739
AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,408	4,084
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	754	739
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,317	2,391
Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,102	1,399
Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	991	1,042
Debt fair value adjustment
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	950	1,019
Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	417	331
Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	402	329
Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	356	388
Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	351	356
Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	311	338
Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	288	343
Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	221	214
Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	213	528
COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	128	133
NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	124	72
Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	123	107
Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	122	117
CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	117	76
Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	110	36
Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107	121
Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	105	65
Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	102
ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	98	65
Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	92	79
Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	86
Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	76
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	589	544
Progress Energy
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6,533	7,292
Less: current portion	758	946
Total noncurrent regulatory assets	5,775	6,346
Total regulatory liabilities	5,691	5,555
Less: current portion	640	330
Total noncurrent regulatory liabilities	5,051	5,225
Progress Energy | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,411	2,595
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,666	2,561
Progress Energy | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	123	123
Progress Energy | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	491	275
Progress Energy | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,357	1,843
Progress Energy | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	685	668
Progress Energy | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	875	897
Progress Energy | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	893	1,214
Progress Energy | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	991	1,042
Progress Energy | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	363	266
Progress Energy | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	51	33
Progress Energy | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	38
Progress Energy | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	148	129
Progress Energy | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	102	114
Progress Energy | Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	241	241
Progress Energy | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	41
Progress Energy | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	162	305
Progress Energy | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	33	35
Progress Energy | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	124	72
Progress Energy | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	35	40
Progress Energy | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107	121
Progress Energy | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	55	37
Progress Energy | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	27	15
Progress Energy | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	29
Progress Energy | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	158	141
Duke Energy Carolinas
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,469	3,910
Less: current portion	473	550
Total noncurrent regulatory assets	2,996	3,360
Total regulatory liabilities	7,008	6,678
Less: current portion	473	255
Total noncurrent regulatory liabilities	6,535	6,423
Duke Energy Carolinas | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,874	3,060
Duke Energy Carolinas | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,975	1,936
Duke Energy Carolinas | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,512	1,100
Duke Energy Carolinas | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	170	175
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	32	39
Duke Energy Carolinas | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	18
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	427	368
Duke Energy Carolinas | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,414	1,696
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	427	477
Duke Energy Carolinas | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	205	178
Duke Energy Carolinas | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	11	16
Duke Energy Carolinas | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	33
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	324	350
Duke Energy Carolinas | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	174	198
Duke Energy Carolinas | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	154	166
Duke Energy Carolinas | Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	46	100
Duke Energy Carolinas | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	84	80
Duke Energy Carolinas | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	222
Duke Energy Carolinas | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	95	98
Duke Energy Carolinas | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	88	67
Duke Energy Carolinas | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	50	28
Duke Energy Carolinas | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	71	50
Duke Energy Carolinas | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	57
Duke Energy Carolinas | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	31
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	164	151
Duke Energy Progress
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	4,468	4,678
Less: current portion	492	526
Total noncurrent regulatory assets	3,976	4,152
Total regulatory liabilities	4,924	4,468
Less: current portion	530	236
Total noncurrent regulatory liabilities	4,394	4,232
Duke Energy Progress | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,662	1,802
Duke Energy Progress | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,666	2,294
Duke Energy Progress | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	123	123
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	473	249
Duke Energy Progress | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,347	1,834
Duke Energy Progress | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	683	509
Duke Energy Progress | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	393	423
Duke Energy Progress | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	785	801
Duke Energy Progress | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	189	83
Duke Energy Progress | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	51	33
Duke Energy Progress | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	38
Duke Energy Progress | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	89	85
Duke Energy Progress | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	57	61
Duke Energy Progress | Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	224	216
Duke Energy Progress | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	41
Duke Energy Progress | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	158	266
Duke Energy Progress | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	33	35
Duke Energy Progress | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	124	72
Duke Energy Progress | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	35	40
Duke Energy Progress | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	25	17
Duke Energy Progress | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	27	15
Duke Energy Progress | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	29
Duke Energy Progress | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	122	109
Duke Energy Florida
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,064	2,613
Less: current portion	265	419
Total noncurrent regulatory assets	1,799	2,194
Total regulatory liabilities	768	1,087
Less: current portion	110	94
Total noncurrent regulatory liabilities	658	993
Duke Energy Florida | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	749	793
Duke Energy Florida | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		267
Duke Energy Florida | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	19	26
Duke Energy Florida | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	10	9
Duke Energy Florida | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2	159
Duke Energy Florida | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	482	474
Duke Energy Florida | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	108	413
Duke Energy Florida | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	991	1,042
Duke Energy Florida | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	174	183
Duke Energy Florida | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	59	44
Duke Energy Florida | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	45	53
Duke Energy Florida | Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	17	25
Duke Energy Florida | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	4	39
Duke Energy Florida | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107	121
Duke Energy Florida | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	30	20
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	35	31
Duke Energy Ohio
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	649	598
Less: current portion	39	49
Total noncurrent regulatory assets	610	549
Total regulatory liabilities	813	827
Less: current portion	65	64
Total noncurrent regulatory liabilities	748	763
Duke Energy Ohio | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	628	654
Duke Energy Ohio | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	68	86
Duke Energy Ohio | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	45	31
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	17	16
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	55	40
Duke Energy Ohio | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	16
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	149	155
Duke Energy Ohio | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	4	7
Duke Energy Ohio | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	16	17
Duke Energy Ohio | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	7	6
Duke Energy Ohio | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	36	40
Duke Energy Ohio | Demand side management (DSM)/Energy Efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1	2
Duke Energy Ohio | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6	5
Duke Energy Ohio | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1
Duke Energy Ohio | CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	117	76
Duke Energy Ohio | Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	102
Duke Energy Ohio | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	21	17
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	166	154
Duke Energy Indiana
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,328	1,172
Less: current portion	125	90
Total noncurrent regulatory assets	1,203	1,082
Total regulatory liabilities	1,738	1,740
Less: current portion	111	55
Total noncurrent regulatory liabilities	1,627	1,685
Duke Energy Indiana | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	956	1,008
Duke Energy Indiana | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	599	599
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	100	90
Duke Energy Indiana | Amounts to be refunded to customers
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	17
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	66	43
Duke Energy Indiana | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	615	529
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	245	243
Duke Energy Indiana | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	43	49
Duke Energy Indiana | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	303	246
Duke Energy Indiana | Hedge costs deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	23
Duke Energy Indiana | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	19	18
Duke Energy Indiana | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	12	12
Duke Energy Indiana | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	9
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	60	52
Piedmont
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	455	363
Less: current portion	153	73
Total noncurrent regulatory assets	302	290
Total regulatory liabilities	1,132	1,212
Less: current portion	88	81
Total noncurrent regulatory liabilities	1,044	1,131
Piedmont | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	499	555
Piedmont | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	575	574
Piedmont | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	6	41
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	3	3
Piedmont | Amounts to be refunded to customers
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	34	34
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	15	5
Piedmont | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	20	16
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	88	90
Piedmont | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	12	12
Piedmont | Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	122	117
Piedmont | Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	110	36
Piedmont | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	71	62
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 32	$ 30