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Supplemental Financial Information - Investments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2018
Jun. 30, 2021
Dec. 31, 2020
Investments        
Long-term Investments     $ 805 $ 821
Equity method investments carrying value     260  
Equity investment without readily determinable fair value     91  
Impairment of investments $ 60      
Unrealized gain   $ 50    
Equity securities        
Investments        
Long-term Investments     754 776
Other        
Investments        
Long-term Investments     51 $ 45
St Jude Medical | Equity securities        
Investments        
Securities in mutual funds held in a rabbi trust     $ 388