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Debt - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) class subsidiaryBusinessTrust
Debt Instrument [Line Items] |  |
Number of classes of financial instruments | class |  | 2
Number of business subsidiary trusts | subsidiaryBusinessTrust |  | 2
Interest Rate Swap |  |
Debt Instrument [Line Items] |  |
Amount of hedged item |  | $ 20
Federal Reserve Bank Advances |  |
Debt Instrument [Line Items] |  |
Collateral, at carrying cost |  | 1,200
Collateral, at fair value |  | $ 1,200
Bank Term Funding Program Advance |  |
Debt Instrument [Line Items] |  |
Proceeds from short-term debt | $ 100 |
Weighted average interest rate (in percent) |  | 4.76%
ACST III | London Interbank Offered Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (in percent) |  | 2.00%
ACST III | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (in percent) |  | 2.00%
Junior Subordinated Debt, Preferred Securities | ACST II | London Interbank Offered Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (in percent) |  | 3.15%
Junior Subordinated Debt, Preferred Securities | ACST II | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (in percent) |  | 3.15%
Federal Home Loan Bank of New York |  |
Debt Instrument [Line Items] |  |
Collateral, at carrying cost |  | $ 861
Collateral, at fair value |  | $ 717

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