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Goodwill and Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]    
2025 (excludes amortization through September 30, 2025) $ 135  
2026 521  
2027 485  
2028 461  
2029 432  
Subsequent years 2,637  
Net Carrying Amount $ 4,671 $ 4,820