Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 34,000,000	$ 33,000,000	$ 23,000,000
Remaining Investment in Qualified Affordable Housing Projects	246,000,000	262,000,000
Unfunded Equity Contributions Obligation Amount	40,000,000	80,000,000
Affordable Housing Project Investment, Write-down, Amount	0	0	$ 0
Loans repurchased under make whole requests	6,000,000	8,000,000
Loans Sold To Outside Investors Loss Reimbursement Settlement Paid		114,000
Loans sold to outside investors original amount	6,800,000,000
Loans sold to outside investors remaining outstanding amount	4,300,000,000
Mortgage Repurchase Reserve	1,000,000	1,000,000
Residential mortgage loans sold with recourse risk	7,000,000	10,000,000
Residential mortgage loans sold with credit recourse risk	19,000,000	24,000,000
Community Reinvestment, Obtaining Tax Credits, and Other Tax Benefits [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	250,000,000	268,000,000
Tax Credit and Other Investments
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	$ 27,000,000	$ 25,000,000