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Debt Securities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) security	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities Transferred from Available for Sale to Held to Maturity, Amortized Cost	$ 1,000
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax	153
Debt securities available for sale	$ 25,942		$ 26,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1,570		1,722
Debt Securities, Available-for-Sale, Realized Loss	$ 26	$ 50
Debt Securities, Available-for-sale, Realized Gain	1	$ 0
Gross Realized Gain (Loss), net	25
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 21,000		$ 20,900

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