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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans Held For Sale | Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) - FVO: Changes in Fair Value	$ 10	$ 32	$ (80)
Loans Held For Sale | Commercial Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) - FVO: Changes in Fair Value	24	53	52
Loans | Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) - FVO: Changes in Fair Value	21	26	42
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) - FVO: Changes in Fair Value	25	7	(16)
Other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) - FVO: Changes in Fair Value	$ (19)	$ (41)	$ (67)

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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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