Contingencies (Details) - USD ($)	Oct. 08, 2026	Oct. 16, 2025	Sep. 30, 2026
Minimum
Loss Contingencies [Line Items]
Range of possible loss, in excess of accruals			$ 0
Maximum
Loss Contingencies [Line Items]
Range of possible loss, in excess of accruals			$ 150,000,000
Kabbage Acquisition | KServicing Wind Down Corp.
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 746,000,000
OCC Consent Order | American Express National Bank (AENB) | Subsequent Event
Loss Contingencies [Line Items]
Loss contingency, damages paid	$ 350,000,000