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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, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2024
USD ($)
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     29 71      
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            
Cash Flow Hedging [Member]              
Derivative [Line Items]              
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2 1 4 4      
Foreign Exchange Contract [Member]              
Derivative [Line Items]              
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax   22 21 44      
Interest Income (Expense), Nonoperating, Net 4 5 12 16      
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]              
Derivative [Line Items]              
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 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         $ 7    
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap              
Derivative [Line Items]              
Derivative Liability, Notional Amount 200 300 200 $ 300      
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] | September 2025              
Derivative [Line Items]              
Derivative Asset, Notional Amount 150   150     19,000  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027              
Derivative [Line Items]              
Derivative Asset, Notional Amount 150   150     ¥ 19,000  
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025              
Derivative [Line Items]              
Derivative Liability, Notional Amount 107   107       100
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2026              
Derivative [Line Items]              
Derivative Liability, 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   $ (4) $ (3)