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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2026
EUR (€)
Mar. 31, 2026
JPY (¥)
Dec. 31, 2025
EUR (€)
Mar. 31, 2025
EUR (€)
Derivative [Line Items]                  
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0   $ 0 $ 0        
September 2023                  
Derivative [Line Items]                  
[Proceeds from net investment hedge terminations]       3          
March 2023                  
Derivative [Line Items]                  
[Proceeds from net investment hedge terminations]         2        
Payments for Hedge, Investing Activities     $ (3) (7)          
Fair Value Hedging | Interest Rate Swap | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivative Liability, Notional Amount 400     400          
Net Investment Hedging [Member] | Currency Swap [Member] | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax       (24)          
Net Investment Hedging [Member] | Currency Swap [Member] | September 2023 | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount 120     120     ¥ 18,000    
Net Investment Hedging [Member] | Currency Swap [Member] | March 2023 | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount 73 107 $ 37 73 107 € 68   € 32 € 100
Net Investment Hedging [Member] | Currency Swap [Member] | September 2027 | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivative, Notional Amount 120     120     ¥ 18,000    
Net Investment Hedging [Member] | Currency Swap [Member] | February 2027 | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivative, Notional Amount   $ 105     $ 105       € 100
Net Investment Hedging [Member] | Currency Swap [Member] | March 2028 | Designated as Hedging Instrument                  
Derivative [Line Items]                  
Derivative, Notional Amount $ 80     $ 80   € 68