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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Cost $ 7,380 $ 7,126
Accumulated Amortization 2,709 2,306
Net Carrying Amount 4,671 4,820
Client relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Cost 6,918 6,650
Accumulated Amortization 2,322 1,961
Net Carrying Amount 4,596 4,689
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Cost 462 476
Accumulated Amortization 387 345
Net Carrying Amount $ 75 $ 131