Derivatives and Hedging Activities - Schedule of Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	$ (467)	$ (237)	$ (360)	$ (895)
Net Gains (Losses) Reclassified From OCI Into Income	(246)	23	(461)	87
Interest income – loans | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(465)	(241)	(356)	(911)
Net Gains (Losses) Reclassified From OCI Into Income	(245)	19	(460)	82
Interest expense — Long-term debt | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(4)	1	(5)	4
Net Gains (Losses) Reclassified From OCI Into Income	(1)	(1)	(1)	(2)
Investment banking and debt placement fees | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	2	3	1	12
Net Gains (Losses) Reclassified From OCI Into Income	$ 0	$ 5	$ 0	$ 7