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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2024
JPY (¥)
Jun. 30, 2023
JPY (¥)
Jun. 30, 2023
EUR (€)
Jun. 30, 2022
JPY (¥)
Derivative [Line Items]                
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments   $ 0 $ 0 $ 0        
Proceeds from net investment hedge terminations   34 29 71        
September 2018                
Derivative [Line Items]                
Proceeds from net investment hedge terminations $ 19              
March 2022                
Derivative [Line Items]                
Proceeds from net investment hedge terminations 10              
January 2023                
Derivative [Line Items]                
Proceeds from net investment hedge terminations   28            
June 2027 [Member]                
Derivative [Line Items]                
Proceeds from net investment hedge terminations   6            
Currency Swap [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount       600       ¥ 64,000
Foreign Currency Contracts                
Derivative [Line Items]                
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax   26 (6)          
Interest Income (Expense), Nonoperating, Net   14 16          
Fair Value Hedging | Interest Rate Swap                
Derivative [Line Items]                
Derivative, notional amount 1,100 1,600 1,100          
Notional Amount 1,100 1,600 1,100          
Cash Flow Hedging | Currency Swap [Member]                
Derivative [Line Items]                
Notional Amount 514 334 514          
Cash Flow Hedging | Foreign Currency Contracts                
Derivative [Line Items]                
Derivative, notional amount 376 401 376          
Notional Amount 513 579 513          
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap                
Derivative [Line Items]                
Derivative Liability, Notional Amount 300 500 300 600        
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2018                
Derivative [Line Items]                
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount 233   233       € 200  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2022                
Derivative [Line Items]                
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount 400   400     ¥ 48,000    
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | January 2023                
Derivative [Line Items]                
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount   300     ¥ 38,000      
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 [Member]                
Derivative [Line Items]                
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount   120     18,000      
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2025 [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount 150   150 200   19,000   24,000
Notional Amount   120     18,000      
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2026 [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount 107   107       100  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025 [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount 107   107       € 100  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount $ 150   $ 150 $ 200   ¥ 19,000   ¥ 24,000
Notional Amount   $ 120     ¥ 18,000