XML 63 R50.htm IDEA: XBRL DOCUMENT v3.25.2
Commodity Derivatives (Details)
MWh in Millions, MMBTU in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
MMBTU
MWh
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
MMBTU
MWh
Jun. 30, 2024
USD ($)
Dec. 31, 2024
MWh
MMBTU
Other Derivative Instruments          
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]          
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ 9 $ 41 $ 21 $ 44  
Cash Flow Hedge Commodity [Member]          
Derivative [Line Items]          
Commodity contracts designated as cash flow hedges $ 0   $ 0    
Electric Commodity [Member]          
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]          
Derivative, Nonmonetary Notional Amount | MWh [1],[2] 65   65   38
Natural Gas Commodity          
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]          
Derivative, Nonmonetary Notional Amount | MMBTU [1],[2] 60   60   77
Natural Gas Commodity | Other Derivative Instruments          
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]          
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities   $ (1) $ 7 [3] $ 3  
[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.
[3] Other than $2 million of 2025 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.