Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	Jan. 31, 2023	Dec. 31, 2022	Aug. 31, 2022	Jul. 31, 2022	May 31, 2022	Apr. 30, 2022	Dec. 31, 2021
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		$ 18,130					$ 14,637
Less: current portion		3,485					2,150
Total noncurrent regulatory assets		14,645					12,487
Total regulatory liabilities		15,048					17,363
Less: current portion		1,466					1,211
Total noncurrent regulatory liabilities		13,582					16,152
Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		6,462					7,199
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		5,151					6,150
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1,038					2,053
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		683					364
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		211					213
DOE Settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		154
Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		78					274
Amounts to be refunded to customers
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		45
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1,226					1,110
AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		3,205					3,408
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		945					684
Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		3,866					1,253
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		2,336					2,017
Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		940					991
Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		881					937
Debt fair value adjustment
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		829					884
Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		666					213
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		378					348
Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		342					356
Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		316					357
Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		288					317
Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		283					311
Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		271					242
Costs of removal regulatory asset
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		221					107
Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		222					221
Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		210					87
CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		190					161
Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		189					235
Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		168					139
NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		157					165
Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		154					120
Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		121					108
COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		120					123
Deferred coal ash handling system costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		92					90
Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		81					94
Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		57					85
Propane caverns
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		26
Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		21					54
Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets							104
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		555					426
Progress Energy
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		8,979					6,939
Less: current portion		1,833					1,030
Total noncurrent regulatory assets		7,146					5,909
Total regulatory liabilities		5,329					6,044
Less: current portion		576					478
Total noncurrent regulatory liabilities		4,753					5,566
Progress Energy | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		2,192					2,394
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		2,269					2,955
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		252					155
Progress Energy | DOE Settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		154
Progress Energy | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		28					87
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		434					453
Progress Energy | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,429					1,399
Progress Energy | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		884					620
Progress Energy | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		2,060					718
Progress Energy | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		759					725
Progress Energy | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		720					759
Progress Energy | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		881					937
Progress Energy | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		559					189
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		128					137
Progress Energy | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		42					47
Progress Energy | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		243					265
Progress Energy | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		21					21
Progress Energy | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		111					130
Progress Energy | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		136					124
Progress Energy | Costs of removal regulatory asset
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		221					107
Progress Energy | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		43					42
Progress Energy | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		78					28
Progress Energy | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		188					230
Progress Energy | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		157					165
Progress Energy | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		64					42
Progress Energy | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		32					32
Progress Energy | Deferred coal ash handling system costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		25					23
Progress Energy | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		81					94
Progress Energy | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		7					18
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		110					87
Duke Energy Carolinas
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		5,388					3,479
Less: current portion		1,095					544
Total noncurrent regulatory assets		4,293					2,935
Total regulatory liabilities		6,313					7,685
Less: current portion		530					487
Total noncurrent regulatory liabilities		5,783					7,198
Duke Energy Carolinas | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		2,475					2,785
Duke Energy Carolinas | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1,769					2,009
Duke Energy Carolinas | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1,038					2,053
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		350					209
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		44					44
Duke Energy Carolinas | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		50					124
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		587					461
Duke Energy Carolinas | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,391					1,227
Duke Energy Carolinas | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,614					339
Duke Energy Carolinas | Deferred Fuel Costs | NCUC
Regulatory Assets Liabilities [Line Items]
Total regulatory assets					$ 327
Duke Energy Carolinas | Deferred Fuel Costs | PSCSC
Regulatory Assets Liabilities [Line Items]
Total regulatory assets				$ 79
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		614					365
Duke Energy Carolinas | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		220					232
Duke Energy Carolinas | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		93					22
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		228					171
Duke Energy Carolinas | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		30					31
Duke Energy Carolinas | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		39					54
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		267					296
Duke Energy Carolinas | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		139					140
Duke Energy Carolinas | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		62					66
Duke Energy Carolinas | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		84					83
Duke Energy Carolinas | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		127					51
Duke Energy Carolinas | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		90					78
Duke Energy Carolinas | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		88					91
Duke Energy Carolinas | Deferred coal ash handling system costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		67					67
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		235					166
Duke Energy Progress
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		5,414					4,651
Less: current portion		690					533
Total noncurrent regulatory assets		4,724					4,118
Total regulatory liabilities		4,452					5,249
Less: current portion		332					381
Total noncurrent regulatory liabilities		4,120					4,868
Duke Energy Progress | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		1,559					1,695
Duke Energy Progress | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		2,269					2,955
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		252					155
Duke Energy Progress | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		28					87
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		344					357
Duke Energy Progress | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,418					1,389
Duke Energy Progress | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		869					613
Duke Energy Progress | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		705					303
Duke Energy Progress | Deferred Fuel Costs | NCUC
Regulatory Assets Liabilities [Line Items]
Total regulatory assets			$ 251
Duke Energy Progress | Deferred Fuel Costs | PSCSC
Regulatory Assets Liabilities [Line Items]
Total regulatory assets						$ 44
Duke Energy Progress | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		417					351
Duke Energy Progress | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		720					759
Duke Energy Progress | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		234					170
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		55					60
Duke Energy Progress | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		42					47
Duke Energy Progress | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		149					171
Duke Energy Progress | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		21					21
Duke Energy Progress | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		81					92
Duke Energy Progress | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		54					57
Duke Energy Progress | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		43					42
Duke Energy Progress | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		78					28
Duke Energy Progress | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		180					218
Duke Energy Progress | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		157					165
Duke Energy Progress | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		64					42
Duke Energy Progress | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		32					32
Duke Energy Progress | Deferred coal ash handling system costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		25					23
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		70					68
Duke Energy Florida
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		3,565					2,288
Less: current portion		1,143					497
Total noncurrent regulatory assets		2,422					1,791
Total regulatory liabilities		877					796
Less: current portion		244					98
Total noncurrent regulatory liabilities		633					698
Duke Energy Florida | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		633					699
Duke Energy Florida | DOE Settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		154
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		90					97
Duke Energy Florida | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		11					10
Duke Energy Florida | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		15					7
Duke Energy Florida | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,355					415
Duke Energy Florida | Deferred Fuel Costs | FPSC
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,200
Duke Energy Florida | Deferred Fuel Costs | FPSC | Subsequent Event
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 795
Duke Energy Florida | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		342					374
Duke Energy Florida | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		881					937
Duke Energy Florida | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		325					19
Duke Energy Florida | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		73					77
Duke Energy Florida | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		94					94
Duke Energy Florida | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		30					38
Duke Energy Florida | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		82					67
Duke Energy Florida | Costs of removal regulatory asset
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		221					107
Duke Energy Florida | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		81					94
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		55					49
Duke Energy Ohio
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		684					707
Less: current portion		103					72
Total noncurrent regulatory assets		581					635
Total regulatory liabilities		633					801
Less: current portion		99					62
Total noncurrent regulatory liabilities		534					739
Duke Energy Ohio | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		496					602
Duke Energy Ohio | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		9					39
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		21					21
Duke Energy Ohio | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities							61
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		107					78
Duke Energy Ohio | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets							33
Duke Energy Ohio | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		54					38
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		129					133
Duke Energy Ohio | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		14					2
Duke Energy Ohio | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		2					5
Duke Energy Ohio | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		15					16
Duke Energy Ohio | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		18					24
Duke Energy Ohio | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		54					41
Duke Energy Ohio | CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		190					161
Duke Energy Ohio | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		28					24
Duke Energy Ohio | Propane caverns
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		26
Duke Energy Ohio | Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets							104
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		154					126
Duke Energy Indiana
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		1,124					1,555
Less: current portion		249					277
Total noncurrent regulatory assets		875					1,278
Total regulatory liabilities		1,641					1,692
Less: current portion		187					127
Total noncurrent regulatory liabilities		1,454					1,565
Duke Energy Indiana | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		840					908
Duke Energy Indiana | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		531					575
Duke Energy Indiana | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		81
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		104					113
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		85					96
Duke Energy Indiana | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		385					749
Duke Energy Indiana | Deferred Fuel Costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		138					158
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		214					222
Duke Energy Indiana | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		20					35
Duke Energy Indiana | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		255					262
Duke Energy Indiana | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		34					38
Duke Energy Indiana | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		15					17
Duke Energy Indiana | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		19					11
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		44					63
Piedmont
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		511					457
Less: current portion		119					141
Total noncurrent regulatory assets		392					316
Total regulatory liabilities		1,098					1,114
Less: current portion		74					56
Total noncurrent regulatory liabilities		1,024					1,058
Piedmont | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		459					510
Piedmont | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		573					572
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities		66					32
Piedmont | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		27					22
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		119					82
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		168					139
Piedmont | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		93					84
Piedmont | Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		57					85
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets		$ 35					$ 33