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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

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