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Restructuring and Asset Related Charges Asset Impairments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]        
Equity Method Investment, Other than Temporary Impairment     $ 41  
Other Asset Related [Member]        
Restructuring Cost and Reserve [Line Items]        
Accelerated Prepaid Royalty Amortization Expense       $ 159
IPR&D [Member]        
Restructuring Cost and Reserve [Line Items]        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 90 $ 54 85  
Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax $ 69 $ 41 $ 66