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Goodwill and Other Intangibles - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, impairment loss $ (26)     $ (26)
Amortizable intangible assets related to acquisitions   $ 189 $ 203  
Accumulated amortization   75 59  
Amortization of intangible assets   20 $ 20 $ 15
Write-off of amortizable intangible assets   $ 2    
Weighted average useful life of finite-lived intangible assets acquired   5 years    
Future amortization of intangibles in next year   $ 20    
Future amortization of intangibles in year two   22    
Future amortization of intangibles in year three   19    
Future amortization of intangibles in year four   18    
Future amortization of intangibles in year five   17    
Future amortization of intangibles after year five   $ 93    
Goodwill, impairment loss, Statement of Income or Comprehensive Income [Extensible Enumeration]       Realized gains (losses) on subsidiaries