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Leases - Additional information regarding leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lessee, Lease, Description [Line Items]      
Operating lease costs $ 34 $ 33  
Sublease income [1] (2) (2)  
Cash payments included in the measurement of lease liabilities reported in operating cash flows 30 31  
Right-of-use assets obtained in exchange for new lease liabilities 30 28  
Right-of-use assets [2] 129 125  
Operating lease liability [2] $ 163 $ 156  
Weighted average discount rate 4.90% 4.70%  
Weighted average remaining lease term 7 years 2 months 12 days 7 years 2 months 12 days  
Balance sheet location of right of use asset Other assets Other assets  
Balance sheet location of operating lease liability Other liabilities Other liabilities  
Rental expense $ 35 $ 38 $ 39
Maximum      
Lessee, Lease, Description [Line Items]      
Operating lease term 13 years    
[1] The sublease income primarily relates to office property in Raleigh, North Carolina.
[2] The right-of-use assets are included in ‘other assets’ while the operating lease liability is included in ‘other liabilities.’