v3.25.4
Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Cost $ 7,567 $ 7,126
Accumulated Amortization 2,821 2,306
Net Carrying Amount 4,746 4,820
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Cost 7,091 6,650
Accumulated Amortization 2,422 1,961
Net Carrying Amount 4,669 4,689
Customer relationships | Mc Griff Insurance Services L L C    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount   2,100
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Cost 476 476
Accumulated Amortization 399 345
Net Carrying Amount $ 77 131
Other | Mc Griff Insurance Services L L C    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount   $ 60