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Financial Commitments and Contingencies (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Other Commitments [Line Items]  
FHLB, maximum amount available $ 1,500
Municipal Bonds and Collateralized Mortgage Obligations  
Other Commitments [Line Items]  
FHLB, collateral pledged 442
Commercial Loan  
Other Commitments [Line Items]  
FHLB, collateral pledged 1,600
Commitments to purchase, expand, or improve real estate and to fund mortgage loans, private loans and investment funds  
Other Commitments [Line Items]  
Aggregate commitments 3,300
Subsidiaries  
Other Commitments [Line Items]  
Letters of credit outstanding, amount 4
Subsidiaries | Commitments to lease office space, technological equipment, and automobiles  
Other Commitments [Line Items]  
Aggregate commitments $ 32