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Allowance for Uncollectible Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ (53) $ (51) $ (60)
Amounts charged to expense (48) (31) (24)
Amounts written off 43 29 33
Ending balance $ (58) $ (53) $ (51)