Financial Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2024 USD ($)
Other Commitments [Line Items]
Lessee, operating lease, liability, to be paid	$ 43
Lessee term	11 years
FHLB, maximum amount available	$ 881
Municipal Bonds and Collateralized Mortgage Obligations
Other Commitments [Line Items]
FHLB, collateral pledged	800
Commercial Loan
Other Commitments [Line Items]
FHLB, collateral pledged	727
Subsidiaries
Other Commitments [Line Items]
Letters of credit outstanding, amount	6
Commitments For Real Estate And Fund Loans And Investments Funds
Other Commitments [Line Items]
Aggregate commitments	4,700
Lease Office Space, Technological Equipment, And Automobiles \| Subsidiaries
Other Commitments [Line Items]
Aggregate commitments	$ 30

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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