Accumulated Other Comprehensive Income - Reclassification Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Securities losses, net	$ (82)	$ (7)	$ 62
Interest and fees on loans and leases	4,954	4,079	4,424
Compensation and benefits	(2,554)	(2,626)	(2,590)
Applicable income tax expense	647	747	370
Net Income	2,446	2,770	1,427
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net Income	74	213	214
Reclassification out of AOCI | Net unrealized gains on available-for-sale debt securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Securities losses, net	2	(4)	45
Income before income taxes	2	(4)	45
Applicable income tax expense	0	1	(11)
Net Income	2	(3)	34
Reclassification out of AOCI | Net unrealized gains on cash flow hedge
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest and fees on loans and leases	99	293	237
Income before income taxes	99	293	237
Applicable income tax expense	(22)	(70)	(50)
Net Income	77	223	187
Reclassification out of AOCI | Net periodic benefit costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	(6)	(9)	(9)
Applicable income tax expense	1	2	2
Net Income	(5)	(7)	(7)
Reclassification out of AOCI | Amortization of net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Compensation and benefits	(3)	(6)	(6)
Reclassification out of AOCI | Settlements
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Compensation and benefits	$ (3)	$ (3)	$ (3)