Commitments to originate real estate loans for sale.

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Commitments to sell real estate loans net.

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Interest rate swap agreements used for interest rate risk management.

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Amount before allowance of consumer installment revolving and home equity loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts.

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Other credit-related commitments.

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Other financial instruments.

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Amount of domestic interest-bearing checking and savings accounts, which may include money market accounts, NOW accounts, interest-bearing corporate checking accounts, brokered deposits and other savings accounts.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Amount of time deposit liabilities, including certificates of deposit.

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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Interest-bearing deposits at banks	$ 36,025,382	$ 41,872,304
Investment securities	9,356,832	7,155,860
Loans and leases:
Commercial loans and leases	92,004,751	93,136,678
Allowance for credit losses	(1,472,359)	(1,469,226)	$ (1,636,206)	$ (1,736,387)
Loans and leases, net	90,336,033	91,443,226
Financial liabilities:
Noninterest-bearing deposits	(58,520,366)	(60,131,480)
Savings and interest-checking deposits	(65,273,150)	(68,603,966)
Time deposits	(2,525,197)	(2,807,963)
Long-term borrowings	(3,443,587)	(3,485,369)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,292,609	1,205,269
Trading account assets	46,655	49,545
Investment securities	72,166	68,850
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	118,851	132,308
Interest-bearing deposits at banks	36,025,382	41,872,304
Trading account assets	150,903	418,486
Investment securities	9,090,244	7,066,293
Loans and leases:
Loans and leases, net	4,890,450	4,949,028
Accrued interest receivable	301,864	335,162
Financial liabilities:
Noninterest-bearing deposits	(58,520,366)	(60,131,480)
Savings and interest-checking deposits	(65,273,150)	(68,603,966)
Time deposits	(2,526,204)	(2,810,143)
Short-term borrowings	(50,307)	(47,046)
Long-term borrowings	(3,464,637)	(3,562,223)
Accrued interest payable	(23,316)	(40,866)
Trading account liabilities	(302,506)	(83,434)
Other financial instruments:
Commitments to sell real estate loans	35,809	7,525
Interest rate swap agreements used for interest rate risk management	3,841	(207)
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	56,505	57,333
Loans and leases:
Consumer loans	18,307,086	18,121,363
Loans and leases, net	85,570,672	87,348,549
Other financial instruments:
Commitments to originate real estate loans for sale	(15,428)	6,440
Other credit-related commitments	(118,390)	(123,032)
Commercial Loans And Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	23,231,047	23,285,224
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	215,764	425,010
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	33,588,368	34,305,181
Residential Real Estate Loans [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	4,674,686	4,524,018
Residential Real Estate Loans [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	10,444,171	11,636,781
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,411,460	1,337,577
Interest-bearing deposits at banks	36,025,382	41,872,304
Trading account assets	197,558	468,031
Investment securities	9,356,832	7,155,860
Loans and leases:
Consumer loans	18,162,938	17,974,953
Allowance for credit losses	(1,472,359)	(1,469,226)
Loans and leases, net	90,336,033	91,443,226
Accrued interest receivable	301,864	335,162
Financial liabilities:
Noninterest-bearing deposits	(58,520,366)	(60,131,480)
Savings and interest-checking deposits	(65,273,150)	(68,603,966)
Time deposits	(2,525,197)	(2,807,963)
Short-term borrowings	(50,307)	(47,046)
Long-term borrowings	(3,443,587)	(3,485,369)
Accrued interest payable	(23,316)	(40,866)
Trading account liabilities	(302,506)	(83,434)
Other financial instruments:
Commitments to originate real estate loans for sale	(15,428)	6,440
Commitments to sell real estate loans	35,809	7,525
Other credit-related commitments	(118,390)	(123,032)
Interest rate swap agreements used for interest rate risk management	3,841	(207)
Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	23,496,017	23,473,324
Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	34,553,558	35,389,730
Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	15,595,879	16,074,445
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,411,460	1,337,577
Interest-bearing deposits at banks	36,025,382	41,872,304
Trading account assets	197,558	468,031
Investment securities	9,218,915	7,192,476
Loans and leases:
Consumer loans	18,307,086	18,121,363
Loans and leases, net	90,461,122	92,297,577
Accrued interest receivable	301,864	335,162
Financial liabilities:
Noninterest-bearing deposits	(58,520,366)	(60,131,480)
Savings and interest-checking deposits	(65,273,150)	(68,603,966)
Time deposits	(2,526,204)	(2,810,143)
Short-term borrowings	(50,307)	(47,046)
Long-term borrowings	(3,464,637)	(3,562,223)
Accrued interest payable	(23,316)	(40,866)
Trading account liabilities	(302,506)	(83,434)
Other financial instruments:
Commitments to originate real estate loans for sale	(15,428)	6,440
Commitments to sell real estate loans	35,809	7,525
Other credit-related commitments	(118,390)	(123,032)
Interest rate swap agreements used for interest rate risk management	3,841	(207)
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	23,231,047	23,285,224
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	33,804,132	34,730,191
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	$ 15,118,857	$ 16,160,799