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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Accumulated deficit $ (2,269)       $ (2,797)       $ (2,269) $ (2,797)   $ (2,784)
Selling, General and Administrative, Including Transaction Related Costs and Stock-Based Compensation                 1,200 744    
Operating                 881 601 $ 606  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization                 7,248 5,598 5,540  
Accrued liabilities 1,026       1,057       1,026 1,057   1,021
Prepaid expenses and other current assets 216       71       216 71   70
Income Tax Expense (Benefit)                 334 139 385  
Inventories 1,280       1,204       1,280 1,204   1,182
Net income 291 $ 181 $ 244 $ 212 495 $ 166 $ 151 $ 135 928 947 642  
Net revenue 3,555 $ 2,569 $ 2,556 $ 2,602 2,817 $ 2,010 $ 1,979 $ 1,965 11,282 8,771 $ 8,682  
Allowance for sales returns 242       $ 119       242 $ 119    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Accumulated deficit                       14
Selling, General and Administrative, Including Transaction Related Costs and Stock-Based Compensation                 118      
Operating                 2      
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization                 10      
Accrued liabilities                       (36)
Prepaid expenses and other current assets $ 116               116      
Income Tax Expense (Benefit)                 2      
Inventories                       (22)
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      
Operating                 879      
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization                 7,238      
Income Tax Expense (Benefit)                 332      
Net income                 921      
Net revenue                 $ 11,143      
Adjustments for New Accounting Pronouncement [Member]                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Accumulated deficit                       (1)
Accrued liabilities                       0
Prepaid expenses and other current assets                       (1)
Inventories                       $ 0