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Basis of Presentation Deferred Revenue Rollforward in Basis of Presentation (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue | $ 66 | $ 72 | $ 64 | $ 69
Deferred Revenue, Additions | 12 | 10 |  |
Deferred Revenue, Revenue Recognized | (10) | (7) |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue | 22 | 18 |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue | $ 44 | 54 |  |
Prepaid Rentals and Membership Fees [Member] |  |  |  |
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue |  | 231 |  | $ 125
Deferred Revenue, Additions |  | 989 |  |
Deferred Revenue, Revenue Recognized |  | (883) |  |
Prepaid Rentals and Membership Fees [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue |  | 229 |  |
Prepaid Rentals and Membership Fees [Member] | Other Noncurrent Liabilities [Member] |  |  |  |
Deferred Revenue Rollforward [Line Items] |  |  |  |
Deferred Revenue |  | $ 2 |  |

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- Definition [Line Items] for Deferred Revenue Rollforward [Table] + References No definition available. + Details
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- Definition Amount of deferred income and obligation to transfer product and 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
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