Derivatives and Hedging Activities - Schedule of Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	$ 107	$ (658)
Net Gains (Losses) Reclassified From OCI Into Income	(216)	65
Interest income – loans | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	109	(670)
Net Gains (Losses) Reclassified From OCI Into Income	(215)	64
Interest expense — Long-term debt | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(1)	3
Net Gains (Losses) Reclassified From OCI Into Income	(1)	(1)
Investment banking and debt placement fees | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(1)	9
Net Gains (Losses) Reclassified From OCI Into Income	$ 0	$ 2