Summary of Significant Accounting Policies (Summary of Activity of Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Allowance for doubtful accounts | |||
| Beginning balance | $ 199 | $ 221 | $ 154 |
| Bad debt expense | 83 | 127 | 125 |
| Write-offs | (114) | (149) | (58) |
| Ending balance | $ 168 | $ 199 | $ 221 |
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- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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