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Fair Value Measurements (Fair Value Option, Fair Value and Unpaid Principal Balance) (Details) - Mortgage loans held for sale [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held for Sale	$ 232		$ 184
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal	227		$ 177
Net gains (losses) resulting from changes in fair value	$ (2)	$ 2

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- Definition

Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal

+ References

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

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-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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- Definition

Fair value portion of mortgage loans held-for-sale.

+ References

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