Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements (Revenue Recognition) (Details)

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Recent Accounting Pronouncements (Revenue Recognition) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventories $ 1,727   $ 1,727   $ 1,384 $ 1,411
Other current assets 198   198   114 125
Other current liabilities 175   175   123 169
Deferred income tax liabilities 2,008   2,008   2,502 2,500
Retained earnings 5,747   5,747   $ 9,074 9,068
Net revenue 3,231   9,694      
Cost of retail sales 2,109 $ 1,554 6,252 $ 4,553    
Selling, general and administrative expenses, including stock based compensation 477 279 1,357 777    
Operating expenses 241 160 707 461    
Income tax (expense) benefit (6) 33 (60) (127)    
Net income 72 $ 296 643 $ 978    
Other Current Assets            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventory expected return current 77   77      
Other Current Liabilities            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Sales return liability current 190   190      
Before Adoption | ASU 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net revenue 3,177   9,552      
Cost of retail sales 2,098   6,229      
Selling, general and administrative expenses, including stock based compensation 446   1,263      
Operating expenses 240   704      
Income tax (expense) benefit (3)   (55)      
Net income 64   626      
Adjustment | ASU 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventories           (27)
Other current assets           (11)
Other current liabilities           (46)
Deferred income tax liabilities           2
Retained earnings           $ 6
Net revenue (54)   (142)      
Cost of retail sales (11)   (23)      
Selling, general and administrative expenses, including stock based compensation (31)   (94)      
Operating expenses (1)   (3)      
Income tax (expense) benefit 3   5      
Net income $ (8)   $ (17)