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Summary of Significant Accounting Policies - 10-K - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Contract period (or less) | 1 year |  |
Activation fee revenue recognition period (months) | 1 month |  |
Other Income and Expenses [Abstract] |  |  |
Advertising expense | $ 392 | $ 267 | $ 263
Engineering, design and development | 280 | 123 | 112
Engineering, Design and Development |  |  |
Other Income and Expenses [Abstract] |  |  |
Engineering, design and development | $ 231 | $ 106 | $ 97
Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Data trial contract period | 3 years |  |
Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of deferred revenue related to long-term contracts | 10.00% |  |
Data trial contract period | 5 years |  |
Subscription prepayment period | 3 years |  |
Prepaid Vehicle Subscriptions | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract period (or less) | 3 months |  |
Prepaid Vehicle Subscriptions | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract period (or less) | 12 months |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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