v3.26.1
Accounting Policies and Supplemental Disclosures - Derivative Instruments (Details)
MWh in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
MWh
Dec. 31, 2025
USD ($)
Derivative [Line Items]      
Energy contract quantity | MWh   270  
Period for which the majority of mega-watt hours is expected to be delivered   9 years  
Unrealized gain on derivatives $ 551 $ 599  
Assets 705 705 $ 112
Liabilities 133 133 $ 139
Net Investment Hedging      
Derivative [Line Items]      
Net investment hedges $ 20,700 $ 20,700  
Maximum      
Derivative [Line Items]      
Derivative term   20 years  
Maximum | Fair Value, Inputs, Level 3 | Electric Future Prices      
Derivative [Line Items]      
Derivative, remaining maturity 6 years 6 years  
Maximum | Fair Value, Inputs, Level 3 | Various Management Assumptions      
Derivative [Line Items]      
Derivative, remaining maturity 6 years 6 years  
Minimum | Fair Value, Inputs, Level 3 | Electric Future Prices      
Derivative [Line Items]      
Derivative, remaining maturity 4 years 4 years  
Minimum | Fair Value, Inputs, Level 3 | Various Management Assumptions      
Derivative [Line Items]      
Derivative, remaining maturity 4 years 4 years  
Weighted Average      
Derivative [Line Items]      
Derivative term   15 years