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Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Contract With Customer, Liability [Roll Forward] |  |
Deferred lease revenues – current | $ 185 | $ 70
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Minimum |  |
Contract With Customer, Liability [Roll Forward] |  |
Revenue recognition period | 2 years |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Maximum |  |
Contract With Customer, Liability [Roll Forward] |  |
Revenue recognition period | 3 years |
Customer Loyalty |  |
Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 34 | 59
Revenue deferred | 49 | 26
Revenue recognized | (33) | (51)
Ending balance | 50 | 34
Deferred lease revenues – current | 33 | 17
Contract with customer, liability, noncurrent | $ 17 | $ 17

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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