v3.25.2
Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Coal $ 67 $ 92
Oil products 54 65
Fuel inventory for electric generation 121 157
Materials and supplies, net 100 88
Environmental products 3 57
Inventory, net $ 224 $ 302