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Summary of Significant Accounting Policies (Other Noncurrent Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Offsetting Assets [Line Items]    
Other (including amounts related to VIEs) $ 4,167 $ 3,507
Renewable Energy Program    
Offsetting Assets [Line Items]    
Other (including amounts related to VIEs) $ 150 $ 150