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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
JPY (¥)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
JPY (¥)
Mar. 31, 2024
JPY (¥)
Derivative [Line Items]                    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0 $ 0 $ 0            
Proceeds from net investment hedge terminations     2 28            
January 2023                    
Derivative [Line Items]                    
Proceeds from net investment hedge terminations     28              
March 2025                    
Derivative [Line Items]                    
Proceeds from Hedge, Financing Activities     2              
Cash Flow Hedging [Member]                    
Derivative [Line Items]                    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (4) (1) 5 2            
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]                    
Derivative [Line Items]                    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax   (2) (3) (4)            
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Forecast [Member] | Subsequent Event                    
Derivative [Line Items]                    
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months         $ 1          
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap                    
Derivative [Line Items]                    
Derivative Liability, Notional Amount   500   500            
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member]                    
Derivative [Line Items]                    
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax (16) (19) (11) (14)            
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net (3)   (7) (10)            
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   300       ¥ 38,000      
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2023                    
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                    
Derivative [Line Items]                    
Derivative, Notional Amount 120   120       ¥ 18,000      
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027                    
Derivative [Line Items]                    
Derivative, Notional Amount   $ 120   $ 120           ¥ 18,000
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | February 2027                    
Derivative [Line Items]                    
Derivative, Notional Amount 105   105     € 100        
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025                    
Derivative [Line Items]                    
Derivative, Notional Amount 107   107     € 100        
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]                    
Derivative [Line Items]                    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 3   $ (1)