Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - 10-K - ASU 2014-09 (Details)

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Summary of Significant Accounting Policies - 10-K - ASU 2014-09 (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
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Activation fee revenue recognition period (months)                 1 month      
Accumulated deficit $ (1,143)       $ (2,057)       $ (1,143) $ (2,057)    
Revenue 2,062 $ 2,011 $ 1,977 $ 1,744 1,496 $ 1,468 $ 1,432 $ 1,375 7,794 5,771 $ 5,425  
Cost of services (916) $ (881) $ (882) $ (748) (572) $ (565) $ (637) $ (535) 3,383      
Subscriber acquisition costs                 427 470 499  
Income tax expense                 (283) (245) (616)  
Net income                 914 1,176 648  
Accumulated other comprehensive income (loss), net of tax $ 8       $ (6)       8 (6)    
Subscription Revenue                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Revenue                 6,120 5,264 4,990  
Revenue Share and Royalties                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of services                 $ 2,291 1,394 $ 1,210  
Adjustments Due to ASU 2018-02                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Accumulated other comprehensive income (loss), net of tax                       $ 4
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Subscriber acquisition costs                   4    
Income tax expense                   0    
Net income                   3    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Activation Fees                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Reduction in deferred revenue                       8
Accumulated deficit                       8
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Loyalty Payments                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Accumulated deficit                       10
Prepaid expense and other assets                       $ 10
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Subscription Revenue                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Revenue                   95    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Revenue Share and Royalties                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of services                   88    
Calculated under Revenue Guidance in Effect before Topic 606                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Subscriber acquisition costs                   474    
Income tax expense                   (245)    
Net income                   1,179    
Calculated under Revenue Guidance in Effect before Topic 606 | Subscription Revenue                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Revenue                   5,359    
Calculated under Revenue Guidance in Effect before Topic 606 | Revenue Share and Royalties                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of services                   $ 1,482