Short-Term Borrowings - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Short-term Debt [Line Items]
Federal home loan bank, advances, maturity period	90 days
Trading liabilities maturity period (less than)	90 days
Other short-term borrowings maturity period (or less)	1 year
Fixed Income Securities
Short-term Debt [Line Items]
Securities pledged to secure other short term borrowings	$ 33