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Revenues Deferred Revenue (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Deferred Revenue Rollforward [Line Items] |  |
Document Period End Date | Sep. 30, 2018 |
Deferred Revenue | $ 216 | $ 194
Deferred Revenue, Additions | 1,573 |
Deferred Revenue, Revenue Recognized | 1,551 |
Prepaid Rentals [Member] |  |
Deferred Revenue Rollforward [Line Items] |  |
Deferred Revenue | 123 | 101
Deferred Revenue, Additions | 1,406 |
Deferred Revenue, Revenue Recognized | 1,384 |
Other Deferred Revenue [Member] |  |
Deferred Revenue Rollforward [Line Items] |  |
Deferred Revenue | 93 | $ 93
Deferred Revenue, Additions | 167 |
Deferred Revenue, Revenue Recognized | 167 |
Accounts Payable and Accrued Liabilities [Member] | Other Deferred Revenue [Member] |  |
Deferred Revenue Rollforward [Line Items] |  |
Deferred Revenue | 38 |
Other Noncurrent Liabilities [Member] | Other Deferred Revenue [Member] |  |
Deferred Revenue Rollforward [Line Items] |  |
Deferred Revenue | $ 55 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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