XML 101 R44.htm IDEA: XBRL DOCUMENT v3.24.0.1
Inventories (Tables)
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Schedule of Utility Inventory
($ millions)2023 2022 
Materials and supplies431 394 
Gas and fuel in storage96 235 
Coal inventory39 32 
566 661