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Derivatives - Narrative (Details) - USD ($)
$ in Millions
 2 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Maximum length of time hedged in cash flow hedge   24 months    
Derivatives designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount $ 1,221 $ 1,221   $ 892
Derivatives designated as hedging instruments | Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount 200 200    
Derivatives designated as hedging instruments | Treasury Lock        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount 400 400    
Derivatives designated as hedging instruments | Intersest Rate Swap & Treasury Lock        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain on derivative 11      
Cash Flow Hedging | Derivatives designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax net unrealized loss associated with cash flow hedging instruments recorded in AOCI $ 12 12    
After-tax net unrealized loss to be reclassified within 12 months   $ 8    
Net Investment Hedging | Derivatives designated as hedging instruments | Cross Currency Interest Rate Contract, Entered in March 2025        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, notional amount     $ 377