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Securities - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) Investment | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) Investment
Schedule of Investments [Line Items] |  |  |  |  |
Federal Home Loan Bank stock, at cost | $ | $ 679 | [1] |  | $ 734 | [2]
Net losses on equity securities | $ | $ 1 |  | $ 0 |  |
Collateralized Mortgage Obligations |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 11 |  |  | 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 | 4 |  |  | 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 |
U.S. Government Agency Bonds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 24 |  |  | 20 |
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 |
Mortgage-Related Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 31 |  |  |  |
Agency Mortgage-backed Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more |  |  |  | 21 |
Equity Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | 1 |  |  |  |
[1] | Carrying value and estimated fair value are at cost.
[2] | Carrying 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 http://asc.fasb.org/extlink&oid=123583765&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 http://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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