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Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of shares invested by employees in company stock (in shares) 4,000,000.0 4,500,000  
Defined contribution plan, annual contributions per employee not grandfathered (as percent) 3.00%    
Corporate-owned life insurance policies $ 260 $ 238  
Deferred compensation liabilities $ 171 164  
United States      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of assets held in U.S. defined benefit plans from total defined plan assets 61.00%    
Matching contribution $ 187 194 $ 167
Non-U.S. Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of assets held in U.S. defined benefit plans from total defined plan assets 24.00%    
Matching contribution $ 33 31 $ 30
Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Maximum percentage of employer 401K matching contribution 5.00%    
Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted-average target asset allocation (as percent) 20.00%    
Fixed income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted-average target asset allocation (as percent) 48.00%    
Other investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted-average target asset allocation (as percent) 32.00%    
Equity securities, U.S. based companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Company stock included in U.S. based company equity securities   672  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated benefit obligation for all defined benefit plans $ 5,400 $ 5,400  
Expected cash contributions to defined benefit pension plans in next fiscal year 58    
Pension Plan | United States      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected cash contributions to defined benefit pension plans in next fiscal year 11    
Pension Plan | Non-U.S. Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected cash contributions to defined benefit pension plans in next fiscal year $ 47