Annual report pursuant to Section 13 and 15(d)

Business & Basis of Presentation - Reclassification (Details)

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Business & Basis of Presentation - Reclassification (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue $ 2,062 $ 2,011 $ 1,977 $ 1,744 $ 1,496 $ 1,468 $ 1,432 $ 1,375 $ 7,794 $ 5,771 $ 5,425
Subscription Revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                 6,120 5,264 4,990
Advertising revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                 1,336 188 160
Equipment                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                 173 155 132
Other revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                 $ 165 164 143
As Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   5,771 5,425
As Reported | Subscription Revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   4,594 4,472
As Reported | Advertising revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   188 160
As Reported | Equipment                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   155 132
As Reported | Other revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   834 661
Reclassification                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   0 0
Reclassification | Subscription Revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   670 518
Reclassification | Advertising revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   0 0
Reclassification | Equipment                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   0 0
Reclassification | Other revenue                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenue                   $ (670) $ (518)