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Debt - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) class subsidiaryBusinessTrust bank | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |
Number of banks | bank | 2 |
Number of classes of financial instruments | class | 2 |
Number of business subsidiary trusts | subsidiaryBusinessTrust | 2 |
Federal Reserve Bank of New York |  |
Debt Instrument [Line Items] |  |
Collateral, at carrying cost | $ 1,000 | $ 1,000
Federal Home Loan Bank of New York |  |
Debt Instrument [Line Items] |  |
Collateral, at carrying cost | 865 | $ 703
Interest Rate Swap |  |
Debt Instrument [Line Items] |  |
Amount of hedged item | $ 20 |
ACST III | London Interbank Offered Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
ACST III | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
Junior Subordinated Debt, Preferred Securities | ACST II | London Interbank Offered Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.15% |
Junior Subordinated Debt, Preferred Securities | ACST II | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.15% |

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