Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Business Combination [Line Items]
Pre-tax gain on sale		$ 0	$ 21	$ 3	$ 21
Sale | Fincentric
Business Combination [Line Items]
Pre-tax gain on sale			21	3	21
Gain on sale after tax			$ 12	$ 2	$ 12
Forecast | With Intelligence | Subsequent Event
Business Combination [Line Items]
Business combination, consideration transferred	$ 1,800