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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, fair value     $ 1,715 $ 39
Remaining cash equivalents     1,167 497
Fair value of long-term debt     18,700 19,200
Fair value of debt reclassified from long term to short term     1,600 $ 1,300
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized     $ 317  
Life Sciences        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Intangible Assets (Excluding Goodwill) $ 39      
Surgery        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Intangible Assets (Excluding Goodwill)   $ 30    
Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maturity period of short-term investments at the time of purchase     3 months  
Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maturity period of short-term investments at the time of purchase     1 year