Goodwill and Mortgage Servicing Rights (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment charges related to goodwill	$ 0	$ 0	$ 0
Mortgage servicing rights	3,686,000,000	3,423,000,000
Fees from Mortgage and Other Loan Servicing	$ 700,000,000	$ 600,000,000	$ 500,000,000

Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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