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Commodity Derivatives (Details)
MWh in Millions, MMBTU in Millions, $ in Millions
Dec. 31, 2023
USD ($)
MWh
MMBTU
Dec. 31, 2022
USD ($)
MWh
MMBTU
Derivative [Line Items]    
Reclaim Cash Collateral $ 7 $ 53
Cash Flow Hedges    
Derivative [Line Items]    
Commodity contracts designated as cash flow hedges $ 0  
Electric Commodity    
Derivative [Line Items]    
Notional Amount | MWh [1],[2] 48 61
Natural Gas Commodity    
Derivative [Line Items]    
Notional Amount | MMBTU [1],[2] 84 131
[1] Not reflective of net positions in the underlying commodities.
[2] Notional amounts for options included on a gross basis but weighted for the probability of exercise.