Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions |
9 Months Ended | |
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Sep. 30, 2021 |
Dec. 31, 2020 |
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| Revenue from Contract with Customer [Abstract] | ||
| Franchise agreement, revenue recognition period (within) | 12 years | |
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, net | $ 32 | $ 33 |
| Other Current Assets | ||
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, net | 4 | 7 |
| Other Noncurrent Assets | ||
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, net | $ 28 | $ 26 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Revenue Recognition Period, Franchise Agreement No definition available.
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