Acquisitions and Dispositions (Acquired Finite-Lived Intangible Assets) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amount	$ 371
Client relationships
Finite-Lived Intangible Assets [Line Items]
Amount	$ 349
Weighted Average Amortization Period	12 years 3 months 18 days
Other
Finite-Lived Intangible Assets [Line Items]
Amount	$ 22
Weighted Average Amortization Period	2 years 9 months 18 days