Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 14,637	$ 14,062
Less: current portion	2,150	1,641
Total noncurrent regulatory assets	12,487	12,421
Total regulatory liabilities	17,363	16,406
Less: current portion	1,211	1,377
Total noncurrent regulatory liabilities	16,152	15,029
Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	7,199	7,368
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	6,150	5,883
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,053	1,512
Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	274	344
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	271	24
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	213	177
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,203	1,098
AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,408	3,408
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	684	754
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,017	2,317
Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,253	213
Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	991
Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Debt fair value adjustment
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	884	950
Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	357	417
Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	356	397
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	348	351
Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	317	356
Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	311	311
Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	242	136
Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	235	242
Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	221	221
Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	213	1,102
NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	161	117
Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	139	122
COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	123	128
Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	120	123
Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	108	92
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	104
Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	90	98
Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	87	76
Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	85	110
Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	54	86
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	426	609
Progress Energy
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6,939	6,533
Less: current portion	1,030	758
Total noncurrent regulatory assets	5,909	5,775
Total regulatory liabilities	6,044	5,691
Less: current portion	478	640
Total noncurrent regulatory liabilities	5,566	5,051
Progress Energy | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,394	2,411
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,955	2,666
Progress Energy | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	87	123
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	117	8
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	491	483
Progress Energy | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,399	1,357
Progress Energy | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	620	685
Progress Energy | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	725	875
Progress Energy | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	718	162
Progress Energy | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	759
Progress Energy | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Progress Energy | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	265	363
Progress Energy | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	47	51
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	137	148
Progress Energy | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	21	32
Progress Energy | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	130	102
Progress Energy | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	124	55
Progress Energy | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	230	241
Progress Energy | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	42
Progress Energy | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	189	893
Progress Energy | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
Progress Energy | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	33
Progress Energy | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	35
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Progress Energy | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
Progress Energy | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23	27
Progress Energy | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	28	23
Progress Energy | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	18	29
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	87	158
Duke Energy Carolinas
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,479	3,469
Less: current portion	544	473
Total noncurrent regulatory assets	2,935	2,996
Total regulatory liabilities	7,685	7,008
Less: current portion	487	473
Total noncurrent regulatory liabilities	7,198	6,535
Duke Energy Carolinas | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,785	2,874
Duke Energy Carolinas | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,009	1,975
Duke Energy Carolinas | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,053	1,512
Duke Energy Carolinas | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	124	170
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	154	16
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	44	32
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	516	429
Duke Energy Carolinas | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,227	1,414
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	365	427
Duke Energy Carolinas | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	339	42
Duke Energy Carolinas | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	232
Duke Energy Carolinas | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	54	11
Duke Energy Carolinas | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	31	32
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	171	174
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	296	324
Duke Energy Carolinas | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	140	154
Duke Energy Carolinas | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	66	50
Duke Energy Carolinas | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	83	84
Duke Energy Carolinas | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	205
Duke Energy Carolinas | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	91	95
Duke Energy Carolinas | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	78	88
Duke Energy Carolinas | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	67	71
Duke Energy Carolinas | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	51	31
Duke Energy Carolinas | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	36	57
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	130	210
Duke Energy Progress
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	4,651	4,468
Less: current portion	533	492
Total noncurrent regulatory assets	4,118	3,976
Total regulatory liabilities	5,249	4,924
Less: current portion	381	530
Total noncurrent regulatory liabilities	4,868	4,394
Duke Energy Progress | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,695	1,662
Duke Energy Progress | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,955	2,666
Duke Energy Progress | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	87	123
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	117	8
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	395	465
Duke Energy Progress | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,389	1,347
Duke Energy Progress | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	613	683
Duke Energy Progress | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	351	393
Duke Energy Progress | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	303	158
Duke Energy Progress | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	759
Duke Energy Progress | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	171	189
Duke Energy Progress | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	47	51
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	60	89
Duke Energy Progress | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	21	32
Duke Energy Progress | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	92	57
Duke Energy Progress | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	57	25
Duke Energy Progress | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	218	224
Duke Energy Progress | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	42
Duke Energy Progress | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	170	785
Duke Energy Progress | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
Duke Energy Progress | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	33
Duke Energy Progress | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	35
Duke Energy Progress | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23	27
Duke Energy Progress | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	28	23
Duke Energy Progress | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	18	29
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	50	122
Duke Energy Florida
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,288	2,064
Less: current portion	497	265
Total noncurrent regulatory assets	1,791	1,799
Total regulatory liabilities	796	768
Less: current portion	98	110
Total noncurrent regulatory liabilities	698	658
Duke Energy Florida | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	699	749
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	97	19
Duke Energy Florida | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	10	10
Duke Energy Florida | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	7	2
Duke Energy Florida | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	374	482
Duke Energy Florida | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	415	4
Duke Energy Florida | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Duke Energy Florida | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	174
Duke Energy Florida | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	77	59
Duke Energy Florida | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38	45
Duke Energy Florida | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	67	30
Duke Energy Florida | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	12	17
Duke Energy Florida | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	19	108
Duke Energy Florida | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Duke Energy Florida | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	37	35
Duke Energy Ohio
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	707	649
Less: current portion	72	39
Total noncurrent regulatory assets	635	610
Total regulatory liabilities	801	813
Less: current portion	62	65
Total noncurrent regulatory liabilities	739	748
Duke Energy Ohio | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	602	628
Duke Energy Ohio | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	39	68
Duke Energy Ohio | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	61	45
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	21	17
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	78	55
Duke Energy Ohio | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	33	22
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	133	149
Duke Energy Ohio | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38
Duke Energy Ohio | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	16	16
Duke Energy Ohio | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	5	7
Duke Energy Ohio | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	24	36
Duke Energy Ohio | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	41	26
Duke Energy Ohio | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	5	1
Duke Energy Ohio | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6	6
Duke Energy Ohio | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2	4
Duke Energy Ohio | CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	161	117
Duke Energy Ohio | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	24	21
Duke Energy Ohio | Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	104
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	115	140
Duke Energy Indiana
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,555	1,328
Less: current portion	277	125
Total noncurrent regulatory assets	1,278	1,203
Total regulatory liabilities	1,692	1,738
Less: current portion	127	111
Total noncurrent regulatory liabilities	1,565	1,627
Duke Energy Indiana | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	908	956
Duke Energy Indiana | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	575	599
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	113	100
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	96	83
Duke Energy Indiana | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	749	615
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	222	245
Duke Energy Indiana | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	158	9
Duke Energy Indiana | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38	43
Duke Energy Indiana | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	262	298
Duke Energy Indiana | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	35	22
Duke Energy Indiana | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	17	19
Duke Energy Indiana | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	11	5
Duke Energy Indiana | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	13	12
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	50	60
Piedmont
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	457	455
Less: current portion	141	153
Total noncurrent regulatory assets	316	302
Total regulatory liabilities	1,114	1,132
Less: current portion	56	88
Total noncurrent regulatory liabilities	1,058	1,044
Piedmont | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	510	499
Piedmont | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	572	575
Piedmont | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2	6
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	5	3
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	25	49
Piedmont | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	20
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	82	88
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	139	122
Piedmont | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	84	71
Piedmont | Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	85	110
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 33	$ 32