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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Derivative [Line Items]        
Net gains (losses) on derivative instruments   $ 15,000,000 $ (15,000,000)  
Pre-tax gains (losses) associated with net investment hedges   55,000,000 (32,000,000)  
Maximum amount of loss   201,000,000    
Cash collateral received   31,000,000 17,000,000 $ 14,000,000
Revolver | Credit Agreement        
Derivative [Line Items]        
Net gains (losses) on derivative instruments $ 32,000,000      
IRPAs        
Derivative [Line Items]        
Notional amount   0 $ 0 $ 0
Pre-tax net gains associated with interest rate hedges   $ 5,000,000    
Forward foreign currency exchange contracts        
Derivative [Line Items]        
Derivative notional amount percent of required need coverage   90.00%