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Accounts Receivable (Activity In The Allowance For Credit Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Receivable [Abstract]      
Allowance for credit losses, Beginning Balance $ 53 $ 47 $ 57
Increases: Provision for bad debt charged to expense 39 35 26
Increases: Provision for bad debt charged to revenue 80 23 30
Write-offs charged against allowance, net of recoveries (106) (52) (66)
Allowance for credit losses, Ending Balance $ 66 $ 53 $ 47