Loans - Summary of Subsequently Delinquent Loans With Payment Modifications (Details) - 90+ Days - Commercial loans $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	$ 166
Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	0
Principal Forgiveness
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	0
Term Extension / Significant Payment Deferral
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	166
Combination
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	0
Real estate, including construction
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	166
Real estate, including construction | Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	0
Real estate, including construction | Principal Forgiveness
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	0
Real estate, including construction | Term Extension / Significant Payment Deferral
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	166
Real estate, including construction | Combination
Financing Receivable, Modified [Line Items]
Loans modified, subsequently default	$ 0