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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, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
JPY (¥)
Mar. 31, 2023
JPY (¥)
Mar. 31, 2023
EUR (€)
Derivative [Line Items]                
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0 $ 0 $ 0        
Proceeds from net investment hedge terminations     28 29        
Effective March 2022                
Derivative [Line Items]                
Proceeds from net investment hedge terminations   10            
Effective September 2018                
Derivative [Line Items]                
Proceeds from net investment hedge terminations   19            
January 2023                
Derivative [Line Items]                
Proceeds from net investment hedge terminations     28          
Cash Flow Hedging [Member]                
Derivative [Line Items]                
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 1 2 2 4        
Foreign Exchange Contract [Member]                
Derivative [Line Items]                
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax 19   14 21        
Interest Income (Expense), Nonoperating, Net 3 4 10 12        
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]                
Derivative [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2 4 4 8        
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Forecast [Member] | Subsequent Event                
Derivative [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net         $ 3      
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap                
Derivative [Line Items]                
Derivative Liability, Notional Amount 500 200 500 200        
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | Effective 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] | Effective 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] | 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 2025                
Derivative [Line Items]                
Derivative, Notional Amount 120 150 120 150   18,000 19,000  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027                
Derivative [Line Items]                
Derivative, Notional Amount $ 120 150 $ 120 150   ¥ 18,000 ¥ 19,000  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025                
Derivative [Line Items]                
Derivative, Notional Amount   107   107       100
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2026                
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