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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets $ 133 $ 152 $ 266 $ 287
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 264   264  
Estimated annual amortization of intangible assets - Year Two 503   503  
Estimated annual amortization of intangible assets - Year Three 435   435  
Estimated annual amortization of intangible assets - Year Four 400   400  
Estimated annual amortization of intangible assets - Year Five $ 351   $ 351