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Debt Securities (Narrative) (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($) security	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 26,224,000,000		$ 26,224,000,000	$ 28,104,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1,722		1,722	1,703
Debt Securities, Available-for-Sale, Realized Loss			$ 222,000,000
Debt Securities, Available-for-sale, Realized Gain			14,000,000
Gross Realized Gain (Loss), net			208,000,000
Debt Securities Transferred from Available for Sale to Held to Maturity, Amortized Cost	$ 2,000,000,000.0	$ 2,500,000,000	2,000,000,000.0
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax	318,000,000	$ 436,000,000
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Debt securities available for sale	$ 20,900,000,000		$ 20,900,000,000	$ 24,000,000,000.0

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