v3.25.2
Interest Rate Derivative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Other Derivative Instruments        
Interest Rate Derivatives [Abstract]        
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) $ 2 $ 2 $ 8 $ 6
Pre-tax gains (losses) recognized during the period in income 4 (14) (12) (18)
Interest Rate Derivatives        
Interest Rate Derivatives [Abstract]        
Derivative Liability, Notional Amount 0   0  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 0   0  
Commodity Trading Contract | Other Derivative Instruments        
Interest Rate Derivatives [Abstract]        
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) 0 0 0 0
Pre-tax gains (losses) recognized during the period in income [1] 4 (14) (8) (13)
Electric Commodity | Other Derivative Instruments        
Interest Rate Derivatives [Abstract]        
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) [2] (2) (2) (8) (6)
Pre-tax gains (losses) recognized during the period in income $ 0 $ 0 0 0
Natural Gas Commodity | Other Derivative Instruments        
Interest Rate Derivatives [Abstract]        
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)     0 0
Pre-tax gains (losses) recognized during the period in income [3],[4]     $ (4) $ (5)
[1]
(a)Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[2] Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[3] Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[4] Relates primarily to option premium amortization