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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 8,339   $ 8,339   $ 8,378
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 10.00%   10.00%    
Discount Rate, fair value inputs     8.50%    
Terminal Growth Rate, fair value inputs     2.00%    
Amortization of intangible assets $ 129 $ 133 $ 385 $ 399  
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year 134   134    
Estimated annual amortization of intangible assets - Year Two 442   442    
Estimated annual amortization of intangible assets - Year Three 408   408    
Estimated annual amortization of intangible assets - Year Four 358   358    
Estimated annual amortization of intangible assets - Year Five 328   328    
Medical Reporting Unit [Member]          
Finite-Lived Intangible Assets [Line Items]          
Carrying Value 10,100   10,100    
Goodwill $ 4,200   $ 4,200