Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 6,833	$ 3,529
Accumulated amortization	(1,881)	(1,715)
Net carrying value	4,952	1,814
Foreign currency translation, Gross carrying value	99	(28)
Foreign currency translation, Accumulated amortization	(12)	3
Foreign currency translation, Net carrying value	87	(25)
Purchased Customer Accounts and Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, excluding foreign currency translation	6,734	3,557
Accumulated amortization, excluding foreign currency translation	(1,869)	(1,718)
Net carrying value, excluding foreign currency translation	$ 4,865	$ 1,839