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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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans Held for Sale	$ 195		$ 195		$ 160
Fair Value Option Mortgages Held For Sale Aggregate Unpaid Principal	193		193		$ 157
Net gains (losses) resulting from changes in fair value	$ (2)	$ (11)	$ (1)	$ (27)

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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.

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

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