Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,663	$ 4,544	$ 4,410	$ 4,486	$ 4,486
Acquisition PCD reserves	0	0	93	0
Acquisition PSL reserves	0	0	229	0
Charge-offs	(324)	(324)	(633)	(636)
Recoveries	98	126	199	233
Acquired gross charge-offs	0	0	(45)	0
Net (charge-offs)	(226)	(198)	(479)	(403)
Provision for credit losses	213	171	401	431
Other	2	6	(2)	9
Ending balance	4,652	4,523	4,652	4,523	4,410
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	832	674	818	719	719
Provision for (recapture of) credit losses	(20)	84	(6)	38
Other	(3)	1	(3)	2
Ending balance	809	759	809	759	818
Allowance for credit loss	5,461	5,282	5,461	5,282	5,200
Allowances for investment securities and other financial assets	99	88	99	88
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,663	4,544	4,732	4,486	4,486
Ending balance					4,732
FirstBank Holding Company
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Acquired gross charge-offs			(45)
Total commercial lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,269	3,205	3,089	3,148	3,148
Acquisition PCD reserves	0	0	53	0
Acquisition PSL reserves	0	0	184	0
Charge-offs	(165)	(163)	(313)	(294)	(510)
Recoveries	36	61	74	108
Acquired gross charge-offs	0	0	(10)	0
Net (charge-offs)	(129)	(102)	(249)	(186)
Provision for credit losses	114	121	181	259
Other	0	6	(4)	9
Ending balance	3,254	3,230	3,254	3,230	3,089
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	693	528	681	580	580
Provision for (recapture of) credit losses	(23)	87	(11)	34
Other	0	1	0	2
Ending balance	670	616	670	616	681
Allowance for credit loss	3,924	3,846	3,924	3,846
Total commercial lending \| Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,269	3,205	3,326	3,148	3,148
Ending balance					3,326
Total consumer lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,394	1,339	1,321	1,338	1,338
Acquisition PCD reserves	0	0	40	0
Acquisition PSL reserves	0	0	45	0
Charge-offs	(159)	(161)	(320)	(342)
Recoveries	62	65	125	125
Acquired gross charge-offs	0	0	(35)	0
Net (charge-offs)	(97)	(96)	(230)	(217)
Provision for credit losses	99	50	220	172
Other	2	0	2	0
Ending balance	1,398	1,293	1,398	1,293	1,321
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	139	146	137	139	139
Provision for (recapture of) credit losses	3	(3)	5	4
Other	(3)	0	(3)	0
Ending balance	139	143	139	143	137
Allowance for credit loss	1,537	1,436	1,537	1,436
Total consumer lending \| Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,394	$ 1,339	$ 1,406	$ 1,338	1,338
Ending balance					$ 1,406

Debt Securities, Available-For-Sale And Held-To-Maturity, And Other Financial Assets, Allowance for Credit Loss

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- Definition

Total allowance for credit losses related to loans, including the allowance for loan and lease losses and allowance for unfunded lending related commitments

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Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Business Combination, Writeoff

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Financing Receivable, Excluding Accrued Interest, Purchased Seasoned Loan, Allowance for Credit Loss at Acquisition Date

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No definition available.

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Financing Receivable, Excluding Interest, Allowance for Credit Loss, Other Increase (Decrease)

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Off-Balance-Sheet, Credit Loss, Liability, Other Credit Loss Expense (Reversal)

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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