Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
INTEREST INCOME:
Loans and leases	$ 1,251	$ 442	$ 3,279	$ 1,259
Securities and money market investments	261	67	765	152
Total interest income	1,512	509	4,044	1,411
INTEREST EXPENSE:
Interest-bearing checking and money market accounts	268	72	657	104
Savings accounts	43	15	122	33
Certificates of deposit	180	23	436	46
Borrowed funds	139	73	492	211
Total interest expense	630	183	1,707	394
Net interest income	882	326	2,337	1,017
Provision for (recovery of) credit losses	62	2	281	9
Net interest income after provision for credit loan losses	820	324	2,056	1,008
NON-INTEREST INCOME:
Fee income	58	5	133	17
Bank-owned life insurance	11	10	32	24
Net (loss) on securities	0	(1)	(1)	(2)
Net return on mortgage servicing rights	23	0	70	0
Net gain on loan sales and securitizations	28	0	73	0
Net Loan administration income	19	0	65	0
Bargain purchase gain	0	0	2,142	0
Other	21	3	46	10
Total non-interest income	160	17	2,560	49
NON-INTEREST EXPENSE:
Compensation and benefits	346	79	854	238
Occupancy and equipment	55	22	142	67
General and administrative	184	31	496	95
Total operating expense	585	132	1,492	400
Amortization of intangibles	36	0	90	0
Merger-related and restructuring expenses	91	4	267	15
Total non-interest expense	712	136	1,849	415
Income before income taxes	268	205	2,767	642
Income tax expense	61	53	141	164
Net income	207	152	2,626	478
Preferred stock dividends	8	8	25	25
Net income available to common stockholders	$ 199	$ 144	$ 2,601	$ 453
Basic (in usd per share)	$ 0.27	$ 0.31	$ 3.62	$ 0.96
Diluted (in usd per share)	$ 0.27	$ 0.30	$ 3.61	$ 0.96
Net income	$ 207	$ 152	$ 2,626	$ 478
Other comprehensive loss, net of tax:
Change in net unrealized loss on securities available for sale, net of tax of $69; $67; $84 and $217, respectively	(195)	(176)	(237)	(567)
Change in pension and post-retirement obligations, net of tax of $—; $—; $(1) and $—, respectively	0	0	2	(1)
Change in net unrealized gain on cash flow hedges, net of tax of $(17); $(11); $(26) and $(18), respectively	47	28	72	46
Reclassification adjustment for defined benefit pension plan, net of tax of $—; $—; $— and $—, respectively	1	1	2	2
Reclassification adjustment for net (loss) gain on cash flow hedges included in net income, net of tax $2; $1; $5 and $(1), respectively	(6)	(2)	(14)	3
Total other comprehensive loss, net of tax	(153)	(149)	(175)	(517)
Total comprehensive income (loss), net of tax	$ 54	$ 3	$ 2,451	$ (39)