Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Summary of Significant Accounting Policies | ||
| Receivables | $ 217 | $ 351 |
| Deferred revenue | $ 32 | $ 34 |
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- References No definition available.
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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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