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Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Contract With Customer, Liability [Roll Forward] |  |
Deferred lease revenues – current | $ 168 | $ 188
Customer Loyalty |  |
Disaggregation of Revenue [Line Items] |  |
Term | 12 months |
Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 61 | 50
Revenue deferred | 58 | 52
Revenue recognized | (52) | (41)
Ending balance | 67 | 61
Deferred lease revenues – current | 20 | 15
Contract with customer, liability, noncurrent | $ 47 | $ 46
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Minimum |  |
Contract With Customer, Liability [Roll Forward] |  |
Revenue recognition period | 2 years |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Maximum |  |
Contract With Customer, Liability [Roll Forward] |  |
Revenue recognition period | 3 years |

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