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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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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).

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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).

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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).

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