Short-Term Borrowings - Overnight maturity (Details) $ in Millions	Dec. 31, 2021 USD ($)
Securities Sold
Short-term Debt [Line Items]
Amortized cost of overnight maturity	$ 1,226
Fair value of overnight maturity	1,227
Repurchase Agreements
Short-term Debt [Line Items]
Amortized cost of overnight maturity	$ 1,575

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration