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Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
	Sep. 03, 2024	Jun. 03, 2024	Dec. 31, 2024	Sep. 06, 2034	Jun. 06, 2029	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Short-term borrowings			$ 500			$ 0
FHLB, Advances, maximum amount available			$ 93,600
Weighted-average interest rate			6.30%			6.50%	5.10%
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Short-term borrowings			$ 500			$ 0
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
FHLB, average interest rate for the year			4.60%
Parent Company | Senior Notes | Scenario, Forecast
Debt Instrument [Line Items]
Long-termdebtfloatingrateinterestequaltoCompoundSOFR				2.06%	1.49%
Parent Company | Five point Seven Two Two Percent Senior Note due June Two Thousand Thirty | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 750
Stated interest rate			5.722%
Parent Company | Five point Five Zero Two Percent Senior Note due Septmeber Two Thousand Thirty Five | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 1,000
Stated interest rate			5.502%

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