CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income for the period	$ 214	$ 175	$ 568	$ 554
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on investment securities	139	(161)	137	(170)
Unrealized loss amortization associated with the securities transferred from AFS to HTM	51	56	147	159
Net unrealized gains on other noninterest-bearing investments	0	1	1	1
Net unrealized holding gains (losses) on derivative instruments	2	(6)	1	15
Reclassification adjustment for decrease in interest income recognized in earnings on derivative instruments	21	32	70	99
Other comprehensive income (loss), net of tax	213	(78)	356	104
Comprehensive income	$ 427	$ 97	$ 924	$ 658