Financial Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2025 USD ($)
Other Commitments [Line Items]
Lessee, operating lease, liability, to be paid	$ 87
Lessee term	11 years
FHLB, maximum amount available	$ 1,400
Municipal Bonds and Collateralized Mortgage Obligations
Other Commitments [Line Items]
FHLB, collateral pledged	800
Commercial Loan
Other Commitments [Line Items]
FHLB, collateral pledged	956
Subsidiaries
Other Commitments [Line Items]
Letters of credit outstanding, amount	6
Commitments to purchase, expand, or improve real estate and to fund mortgage loans, private loans and investment funds
Other Commitments [Line Items]
Aggregate commitments	3,100
Commitments to lease office space, technological equipment, and automobiles \| Subsidiaries
Other Commitments [Line Items]
Aggregate commitments	$ 24

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

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Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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