Acquisitions and Dispositions (Acquired Finite-Lived Intangible Assets by Major class) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amount	$ 100
Client relationships
Finite-Lived Intangible Assets [Line Items]
Amount	$ 96
Weighted Average Amortization Period	11 years 4 months 24 days
Other
Finite-Lived Intangible Assets [Line Items]
Amount	$ 4
Weighted Average Amortization Period	4 years 2 months 12 days