Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS - Parenthetical (Details) - Debt securities available-for-sale - USD ($) $ in Billions	Dec. 31, 2022	Dec. 31, 2021
Asset pledged as collateral
Schedule of Available-for-sale Securities [Line Items]
Debt securities	$ 10.3	$ 20.9
Asset Not Pledged as Collateral
Schedule of Available-for-sale Securities [Line Items]
Debt securities	$ 11.3	$ 22.0

Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

No definition available.

Name:	us-gaap_DebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant