Goodwill and Acquired Intangible Assets (Finite-Lived Intangible Assets Amortization Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Intangible Asset, Goodwill and Other [Abstract]
Amortization expense	$ 121	$ 122	$ 243	$ 243