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Hedging Activities - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2024
CAD ($)
Mar. 31, 2024
CAD ($)
Jun. 15, 2023
USD ($)
Derivative [Line Items]            
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax $ 0 $ 0        
Net Investment Hedging | CAD | Currency swap | Derivatives designated for hedge accounting            
Derivative [Line Items]            
Derivative, notional amount       $ 2,500 $ 1,500  
Derivative notional amount, terminated       $ 1,500    
Cash Flow Hedges | Currency swap | Derivatives designated for hedge accounting            
Derivative [Line Items]            
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax $ 0 (6,000,000)        
Cash Flow Hedges | Floating interest rate swaps | Derivatives designated for hedge accounting            
Derivative [Line Items]            
Derivative, notional amount           $ 500,000,000
Derivative, notional amount, entered into during period   $ 50,000,000 $ 450,000,000      
Derivative termination proceeds, amortization period (in years) 10 years