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Supplemental Financial Information - Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2018
Dec. 31, 2019
Investments        
Long-term Investments   $ 803   $ 883
Equity method investments carrying value   292    
Equity investment without readily determinable fair value   112    
Impairment of investments $ 60 110    
Additional investments   30    
Unrealized gain     $ 50  
Equity securities        
Investments        
Long-term Investments   755   836
Other        
Investments        
Long-term Investments   48   $ 47
St Jude Medical | Equity securities        
Investments        
Securities in mutual funds held in a rabbi trust   $ 336