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Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [1] $ 528 $ 418
Regulatory Liability, Noncurrent [1] 5,827 5,569
Regulatory assets not currently earning a return 1,085 1,020
Regulatory assets not currently earning a return 1,085 1,020
Other Current Liabilities    
Regulatory Liabilities [Line Items]    
Entity's Recorded Provision for Revenue Subject To Refund 187 67
Deferred income tax adjustment and TCJA refunds    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [2] 7 9
Regulatory Liability, Noncurrent [2] 3,015 3,110
Plant removal costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 0 0
Regulatory Liability, Noncurrent 1,984 1,819
Effects of regulation on employee benefit costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [3] 0 0
Regulatory Liability, Noncurrent [3] 253 247
Renewable resources and environmental initiatives    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 9 6
Regulatory Liability, Noncurrent 188 173
Net AROs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [4] 0 0
Regulatory Liability, Noncurrent [4] 90 0
Sales true-up and revenue decoupling    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 18 0
Regulatory Liability, Noncurrent $ 76 77
Sales true-up and revenue decoupling | Maximum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 2 years  
ITC deferrals    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current $ 1 1
Regulatory Liability, Noncurrent 60 61
LP&L Departure Payment    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 33 0
Regulatory Liability, Noncurrent $ 33 0
LP&L Departure Payment | Maximum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 10 years  
Formula rates    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current $ 29 32
Regulatory Liability, Noncurrent $ 18 17
Formula rates | Minimum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 1 year  
Formula rates | Maximum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 2 years  
DOE settlement    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current $ 18 12
Regulatory Liability, Noncurrent $ 6 3
DOE settlement | Minimum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 1 year  
DOE settlement | Maximum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 2 years  
Contract valuation adjustments    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [5] $ 56 175
Regulatory Liability, Noncurrent [5] 0 1
Deferred electric, natural gas and steam production costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 220 39
Regulatory Liability, Noncurrent 0 0
Conservation programs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [6] 47 72
Regulatory Liability, Noncurrent [6] $ 0 0
Conservation programs | Minimum    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Amortization Period 1 year  
Other    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current $ 90 72
Regulatory Liability, Noncurrent $ 104 $ 61
[1] Revenue subject to refund of $187 million and $67 million for 2023 and 2022, respectively, is included in other current liabilities.
[2] Includes the revaluation of recoverable/regulated plant accumulated deferred income taxes and revaluation impact of non-plant accumulated deferred income taxes due to the TCJA.
[3] Includes regulatory amortization and certain 2018 TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset.
[4] Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.
[5] Includes the fair value of FTR instruments utilized/intended to offset the impacts of transmission system congestion.
[6] Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.