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] Carrying value and estimated fair value are at cost.