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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets $ 133 $ 148 $ 399 $ 435
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 133   133  
Estimated annual amortization of intangible assets - Year Two 504   504  
Estimated annual amortization of intangible assets - Year Three 436   436  
Estimated annual amortization of intangible assets - Year Four 401   401  
Estimated annual amortization of intangible assets - Year Five $ 351   $ 351