Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions |
6 Months Ended | |
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Jun. 30, 2021 |
Jun. 30, 2020 |
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| Accounts Receivable, Allowance for Credit Loss [Roll Forward] | ||
| Balance as of January 1, | $ 72 | $ 47 |
| Provision for doubtful accounts | 14 | 21 |
| Bad debt write-offs | (8) | (13) |
| Balance as of June 30, | 78 | $ 67 |
| Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | ||
| Accounts Receivable, Allowance for Credit Loss [Roll Forward] | ||
| Balance as of January 1, | $ 12 | |
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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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