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Revenues - Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance $ 268 $ 219 $ 157
Charged to expense 762 743 758
Uncollected balances written off, net of recoveries (826) (694) (696)
Balance $ 204 $ 268 $ 219