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Fair Values of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Assets |  |
Cash and due from banks | $ 66,637 | $ 56,502
Investment securities held-to-maturity | 67,346 | 66,275
Financial Liabilities |  |
Long-term debt | 62,535 | 58,002
Carrying Amount |  |
Financial Assets |  |
Cash and due from banks | 66,637 | 56,502
Federal funds sold and securities purchased under resale agreements | 5,373 | 6,380
Investment securities held-to-maturity | 76,931 | 78,634
Loans held for sale | 202 | 322
Loans, net of allowance for losses | 374,960 | 372,249
Other | 2,281 | 2,482
Financial Liabilities |  |
Time deposits | 50,102 | 49,015
Short-term borrowings | 12,857 | 13,583
Long-term debt | 61,127 | 57,611
Other | 4,628 | 5,220
Fair Value |  |
Financial Assets |  |
Cash and due from banks | 66,637 | 56,502
Federal funds sold and securities purchased under resale agreements | 5,373 | 6,380
Investment securities held-to-maturity | 67,346 | 66,275
Loans held for sale | 202 | 322
Loans, net of allowance for losses | 373,152 | 365,628
Other | 2,281 | 2,482
Financial Liabilities |  |
Time deposits | 50,149 | 49,156
Short-term borrowings | 12,703 | 13,419
Long-term debt | 60,837 | 56,441
Other | 4,628 | 5,220
Fair Value | Level 1 |  |
Financial Assets |  |
Cash and due from banks | 66,637 | 56,502
Federal funds sold and securities purchased under resale agreements | 0 | 0
Investment securities held-to-maturity | 641 | 1,275
Loans held for sale | 0 | 0
Loans, net of allowance for losses | 0 | 0
Other | 0 | 0
Financial Liabilities |  |
Time deposits | 0 | 0
Short-term borrowings | 0 | 0
Long-term debt | 0 | 0
Other | 0 | 0
Fair Value | Level 2 |  |
Financial Assets |  |
Cash and due from banks | 0 | 0
Federal funds sold and securities purchased under resale agreements | 5,373 | 6,380
Investment securities held-to-maturity | 66,705 | 65,000
Loans held for sale | 0 | 0
Loans, net of allowance for losses | 0 | 0
Other | 1,637 | 1,767
Financial Liabilities |  |
Time deposits | 50,149 | 49,156
Short-term borrowings | 12,703 | 13,419
Long-term debt | 60,837 | 56,441
Other | 1,399 | 1,369
Fair Value | Level 3 |  |
Financial Assets |  |
Cash and due from banks | 0 | 0
Federal funds sold and securities purchased under resale agreements | 0 | 0
Investment securities held-to-maturity | 0 | 0
Loans held for sale | 202 | 322
Loans, net of allowance for losses | 373,152 | 365,628
Other | 644 | 715
Financial Liabilities |  |
Time deposits | 0 | 0
Short-term borrowings | 0 | 0
Long-term debt | 0 | 0
Other | $ 3,229 | $ 3,851

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)(A)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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