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Revenue - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Adjustments to sales incentives $ 340 $ 560      
Contract liabilities 2,300   $ 2,300   $ 2,200
Deferred revenue recognized 245 $ 434 872 $ 1,300  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Deferred revenue expected to be recognized $ 387   $ 387    
Expected timing of performance obligation 3 months   3 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Deferred revenue expected to be recognized $ 839   $ 839    
Expected timing of performance obligation 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Deferred revenue expected to be recognized $ 414   $ 414    
Expected timing of performance obligation 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Deferred revenue expected to be recognized $ 617   $ 617    
Expected timing of performance obligation