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Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [1] $ 407 $ 436
Regulatory Liability, Noncurrent [1] 5,077 5,187
Regulatory assets not currently earning a return 544 512
Other Current Liabilities    
Regulatory Liabilities [Line Items]    
Entity's Recorded Provision for Revenue Subject To Refund 28 29
Deferred income tax adjustment and TCJA refunds    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [2] 75 157
Regulatory Liability, Noncurrent [2] 3,523 3,715
Plant removal costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 0 0
Regulatory Liability, Noncurrent 1,217 1,175
Effects of regulation on employee benefit costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [3] 0 0
Regulatory Liability, Noncurrent [3] 196 137
Renewable resources and environmental initiatives    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 0 9
Regulatory Liability, Noncurrent 45 54
ITC deferrals    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [4] 0 0
Regulatory Liability, Noncurrent [4] 38 40
Deferred electric, natural gas and steam production costs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 138 102
Regulatory Liability, Noncurrent 0 0
Contract valuation adjustments    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [5] 19 26
Regulatory Liability, Noncurrent [5] 0 0
Conservation programs    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current [6] 37 36
Regulatory Liability, Noncurrent [6] 0 0
DOE settlement    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 37 19
Regulatory Liability, Noncurrent 0 0
Other    
Regulatory Liabilities [Line Items]    
Regulatory Liability, Current 101 87
Regulatory Liability, Noncurrent $ 58 $ 66
[1]
Revenue subject to refund of $28 million and $29 million for 2019 and 2018, respectively, is included in other current liabilities.
[2]
Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT 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 impact of lower federal tax rate due to the TCJA.
[5]
Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.
[6]
Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.