Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - 10-K - Additional Information (Details)

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Summary of Significant Accounting Policies - 10-K - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
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