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Investment Securities - Investment Securities, Narrative (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) loan | Mar. 31, 2022 USD ($) | Mar. 11, 2023 USD ($) | Dec. 31, 2022 USD ($) loan
Schedule of Investments [Line Items] |  |  |  |
Federal home loan bank stock | $ | $ 1,356 |  |  | $ 1,267
Federal reserve bank stock | $ | 200 |  |  | $ 176
Equity securities, FV-NI, gain (loss) | $ | $ 0 | $ (1) |  |
Collateralized Debt Obligations |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 54 |  |  | 23
Capital trust notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 6 |  |  | 5
Asset-backed securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 7 |  |  | 7
Corporate bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 8 |  |  | 2
Debt Securities | $ |  |  | $ 20 |
Provision for Other Credit Losses | $ | $ 20 |  |  |
US Government Agencies Debt Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 33 |  |  | 33
Agency - commercial |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 242 |  |  | 133
Mutual funds and common stock |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 1 |  |  | 1
Municipal bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of securities continuous unrealized loss position more than twelve months | 1 |  |  | 1
Federal Home Loan Bank of New York |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Federal home loan bank stock | $ | $ 827 |  |  | $ 762
Federal Home Loan Bank of Indianapolis |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Federal home loan bank stock | $ | $ 329 |  |  | $ 329

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + 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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