Commitments, Contingencies, Guarantees, and Others - Litigation (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) claim	Dec. 31, 2021 USD ($) claim
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 200	$ 200
Interchange litigation | Pending litigation
Loss Contingencies [Line Items]
Litigation settlement, attributable to reporting entity and third party		$ 5,500
Cybersecurity Incident
Loss Contingencies [Line Items]
Number of consumer class action cases filed for Cybersecurity Incident | claim	75	75
Litigation settlement amount of consumer class actions	$ 190
Penalty Paid to the US Treasury	$ 80	$ 80