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Securities - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) Investment | Dec. 31, 2021 USD ($) Investment | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Federal Home Loan Bank and Federal Reserve Bank stock, at cost | $ | $ 1,267 | $ 734 | [1] |
Federal Reserve Bank Stock | $ | 176 | 0 |  |
Net unrealized (loss) gains on equity securities | $ | (2) | 0 |  | $ 1
FHLB - NY |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Federal Home Loan Bank and Federal Reserve Bank stock, at cost | $ | 762 | $ 734 |  |
FHLB - Indianapolis |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Federal Home Loan Bank and Federal Reserve Bank stock, at cost | $ | $ 329 |  |  |
Collateralized Mortgage Obligations |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 23 | 4 |  |
Capital Trust Notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 5 | 5 |  |
Asset-backed Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 7 | 4 |  |
Corporate Bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 2 | 2 |  |
Municipal Bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 1 | 1 |  |
US Government Agencies Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 33 | 20 |  |
Mortgage-Related Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 133 | 21 |  |
Mutual Fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 1 |  |  |
[1] | Carryin g value and estimated fair value are at cost.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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