Short-Term Borrowings and Long-Term Debt - Narrative (Details)	Dec. 31, 2023 USD ($) trust	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Number of wholly owned subsidiaries that are statutory business trusts | trust	6
Junior subordinated debt
Debt Instrument [Line Items]
Number of statutory business trusts formed for the purpose of issuing junior subordinated debt to third party investors | trust	6
Asset Pledged as Collateral with Right | Notes Payable, Other Payables | Bank Term Funding Program (BTFP)
Debt Instrument [Line Items]
Short-term borrowings | $	$ 4,300,000,000	$ 0
Unused borrowing capacity, amount | $	$ 121,000,000