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Summary of Significant Accounting Policies Deferred Revenue (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | $ 187 | $ 194
Deferred Revenue, Additions | 1,982 |
Deferred Revenue, Revenue Recognized | 1,989 |
Prepaid Rentals [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | 104 | 101
Deferred Revenue, Additions | 1,764 |
Deferred Revenue, Revenue Recognized | 1,761 |
Other Deferred Revenue [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | 83 | $ 93
Deferred Revenue, Additions | 218 |
Deferred Revenue, Revenue Recognized | 228 |
Accounts Payable and Accrued Liabilities [Member] | Other Deferred Revenue [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | 36 |
Other Noncurrent Liabilities [Member] | Other Deferred Revenue [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Deferred Revenue | $ 47 |

X
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets 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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X
- 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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- 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. + References No definition available. + Details
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- Details
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- Details
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