Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Adoption of New Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies Adoption of New Accounting Pronouncements (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, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Operating Lease, Right-of-Use Asset $ 214       $ 0       $ 214 $ 0   $ 92
Accumulated deficit (2,390)       (2,269)       (2,390) (2,269)    
Selling, General and Administrative, Including Transaction Related Costs and Stock-Based Compensation                 1,128 1,200 $ 744  
Operating                 768 881 601  
Cost of Goods and Services Sold                 7,148 7,248 5,598  
Accrued liabilities 1,045       1,026       1,045 1,026    
Prepaid expenses and other current assets 184       216       184 216    
Income Tax Expense (Benefit)                 262 334 139  
Inventories 1,214       1,280       1,214 1,280    
Net income 225 $ 188 $ 218 $ 186 291 $ 181 $ 244 $ 212 817 928 947  
Net revenue 3,467 $ 2,504 $ 2,514 $ 2,501 3,555 $ 2,569 $ 2,556 $ 2,602 10,986 11,282 $ 8,771  
Allowance for sales returns 238       242       238 242    
Operating Lease, Liability, Current 28       $ 0       28 0   18
Operating Lease, Liability, Noncurrent $ 190               $ 190     87
Deferred Rent Credit                       $ 13
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Selling, General and Administrative, Including Transaction Related Costs and Stock-Based Compensation                   118    
Cost of Goods and Services Sold                   10    
Income Tax Expense (Benefit)                   2    
Net income                   7    
Net revenue                   139    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Selling, General and Administrative, Including Transaction Related Costs and Stock-Based Compensation                   1,082    
Cost of Goods and Services Sold                   7,238    
Income Tax Expense (Benefit)                   332    
Net income                   921    
Net revenue                   $ 11,143