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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
[1]
Jun. 30, 2019
[1]
Mar. 31, 2019
[1]
Dec. 31, 2018
Sep. 30, 2018
[1]
Jun. 30, 2018
[1]
Mar. 31, 2018
[1]
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Jun. 01, 2019
Integration and Separation Costs $ 50 [1] $ 152 $ 330 $ 212 $ 295 [1] $ 253 $ 249 $ 195 $ 255 $ 744 $ 992  
Restricted Cash                       $ 319
Percentage of FIFO Inventory 59.00%       57.00%         59.00% 57.00%  
Percentage of Weighted Average Cost Inventory 41.00%       43.00%         41.00% 43.00%  
Minimum [Member]                        
Definite-Lived Intangible Asset, Useful Life                   2 years    
Maximum [Member]                        
Definite-Lived Intangible Asset, Useful Life                   25 years    
Other Current Assets [Member]                        
Prepaid Royalties $ 440                 $ 440    
Restricted Cash 409       $ 460         409 $ 460  
Other Assets [Member]                        
Prepaid Royalties $ 794                 $ 794    
[1] Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, for additional information related to integration and separation costs, restructuring and asset related charges - net, discontinued operations, and goodwill impairment charge, respectively.