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Hedging Activities - Schedule of Foreign Currency Gains and (Losses) from Non-Derivative Instruments (Details) - Derivatives designated for hedge accounting:
€ in Millions, £ in Millions, $ in Millions, $ in Millions
Mar. 31, 2026
CAD ($)
Mar. 31, 2026
GBP (£)
Mar. 31, 2026
EUR (€)
Mar. 31, 2026
USD ($)
Jan. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
GBP (£)
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
GBP (£)
Interest rate swaps (non-current) | Fair Value Hedges                      
Derivatives, Fair Value [Line Items]                      
Notional       $ 1,300              
Interest rate swaps (non-current) | Cash Flow Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional           $ 1,400          
CAD | Cross-currency swaps | Net Investment Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional $ 6,500           $ 6,500        
GBP | Cross-currency swaps | Fair Value Hedges                      
Derivatives, Fair Value [Line Items]                      
Notional | £   £ 450           £ 450      
GBP | Foreign currency forwards | Cash Flow Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional | £   £ 0           £ 11     £ 45
EUR | Cross-currency swaps | Fair Value Hedges                      
Derivatives, Fair Value [Line Items]                      
Notional | €     € 500           € 1,100    
USD | Interest rate swaps (non-current) | Fair Value Hedges                      
Derivatives, Fair Value [Line Items]                      
Notional       750           $ 750  
USD | Interest rate swaps (non-current) | Cash Flow Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional       $ 0           $ 850  
USD | Foreign currency forwards | Cash Flow Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional         $ 791