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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Regulatory Assets [Line Items]    
Regulatory Asset, Current $ 21 $ 19
Regulatory Asset, Noncurrent 225 215
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided 0 0
Environmental Remediation Costs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 13 13
Regulatory Asset, Noncurrent 79 94
Pension and Retiree Medical Obligations    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 4 4
Regulatory Asset, Noncurrent 55 67
Deferred Fuel Costs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 2 0
Regulatory Asset, Noncurrent $ 29 0
Deferred Fuel Costs | Maximum    
Regulatory Assets [Line Items]    
Regulatory Asset, Amortization Period 2 years  
Deferred Fuel Costs | Minimum    
Regulatory Assets [Line Items]    
Regulatory Asset, Amortization Period 1 year  
State Commission Adjustments    
Regulatory Assets [Line Items]    
Regulatory Asset, Current $ 1 1
Regulatory Asset, Noncurrent 21 20
Recoverable Deferred Taxes on AFUDC Recorded in Plant    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 0 0
Regulatory Asset, Noncurrent 19 18
Asset Retirement Obligation Costs    
Regulatory Assets [Line Items]    
Regulatory Asset, Current [1] 0 0
Regulatory Asset, Noncurrent [1] (10) 6
Losses on Reacquired Debt    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 0 0
Regulatory Asset, Noncurrent 2 2
Other    
Regulatory Assets [Line Items]    
Regulatory Asset, Current 1 1
Regulatory Asset, Noncurrent $ 10 $ 8
[1] Includes amounts recorded for future recovery of AROs.