Financial Derivatives (Gains (Losses) on Derivatives Not Designated As Hedging) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	$ 8	$ (260)	$ (85)
Mortgage Banking | Interest rate contracts
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	(201)	(70)	(671)
Customer-related Contracts
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	123	205	331
Customer-related Contracts | Interest rate contracts
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	(26)	(15)	220
Customer-related Contracts | Foreign exchange contracts and other
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	149	220	111
Other Risk Management Activity | Foreign exchange contracts and other
Derivative [Line Items]
Total gains (losses) from derivatives not designated as hedging instruments	$ 86	$ (395)	$ 255