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Derivative financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Information about Interest Rate Swap Agreements | Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by the type of financial instrument the swap agreements were intended to hedge follows:
| Notional Amount |  | Weighted-Average Maturity (In years) |  | Weighted- Average Rate |  | Estimated Fair Value Gain (Loss) (a)
(Dollars in millions) |  |  | Fixed |  | Variable |
September 30, 2025 |  |  |  |  |  |  |  |  |
Fair value hedges: |  |  |  |  |  |  |  |  |
Fixed rate long-term borrowings (b) (d) | $ | 6,100 |  |  | 5.1 |  | 3.56 | % |  | 4.26 | % |  | $ | 4 |
Cash flow hedges: |  |  |  |  |  |  |  |  |
Interest payments on variable rate commercial real estate and commercial and industrial loans (b) (e) | 25,000 |  |  | 1.5 |  | 3.65 |  |  | 4.28 |  |  | 8 |
Total | $ | 31,100 |  |  | 2.2 |  |  |  |  |  | $ | 12 |
December 31, 2024 |  |  |  |  |  |  |  |  |
Fair value hedges: |  |  |  |  |  |  |  |  |
Fixed rate long-term borrowings (b) (f) | $ | 5,350 |  |  | 5.9 |  | 3.55 | % |  | 4.71 | % |  | $ | (2) |
Fixed rate investment securities available for sale (c) | 15 |  |  | 0.1 |  | 4.84 |  |  | 4.36 |  |  | — |
Cash flow hedges: |  |  |  |  |  |  |  |  |
Interest payments on variable rate commercial real estate and commercial and industrial loans (b) (g) | 30,819 |  |  | 1.6 |  | 3.41 |  |  | 4.47 |  |  | 1 |
Total | $ | 36,184 |  |  | 2.2 |  |  |  |  |  | $ | (1) |
__________________________________________________________________________________ (a)Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such payments for interest rate swap agreements designated as fair value hedges was a net settlement of gains of $1 million and of losses of $153 million at September 30, 2025 and December 31, 2024, respectively. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of gains of $83 million and of losses of $136 million at September 30, 2025 and December 31, 2024, respectively. (b)Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate. (c)Under the terms of these agreements, the Company receives settlement amounts at a variable rate and pays at a fixed rate. (d)Includes notional amount and terms of $2.8 billion of forward-starting interest rate swap agreements that become effective in 2025 and 2026. (e)Includes notional amount and terms of $10.4 billion of forward-starting interest rate swap agreements that become effective in 2025, 2026 and 2027. (f)Includes notional amount and terms of $3.4 billion of forward-starting interest rate swap agreements that become effective in 2025 and 2026. (g)Includes notional amount and terms of $10.0 billion of forward-starting interest rate swap agreements that become effective in 2025 and 2026.
Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet | Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows:
| Asset Derivatives |  | Liability Derivatives
| Fair Value |  | Fair Value
(Dollars in millions) | September 30, 2025 |  | December 31, 2024 |  | September 30, 2025 |  | December 31, 2024
Derivatives designated and qualifying as hedging instruments (a) |  |  |  |  |  |  |
Interest rate swap agreements | $ | 12 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 3 |
Commitments to sell real estate loans | 1 |  |  | 4 |  |  | — |  |  | — |
| 13 |  |  | 6 |  |  | — |  |  | 3 |
Derivatives not designated and qualifying as hedging instruments (a) |  |  |  |  |  |  |
Mortgage banking: |  |  |  |  |  |  |
Commitments to originate real estate loans for sale | 20 |  |  | 4 |  |  | 23 |  |  | 32 |
Commitments to sell real estate loans | 28 |  |  | 39 |  |  | 6 |  |  | — |
| 48 |  |  | 43 |  |  | 29 |  |  | 32 |
Other: |  |  |  |  |  |  |
Interest rate contracts (b) | 174 |  |  | 185 |  |  | 435 |  |  | 769 |
Foreign exchange and other option and futures contracts | 18 |  |  | 21 |  |  | 16 |  |  | 18 |
| 192 |  |  | 206 |  |  | 451 |  |  | 787 |
Total derivatives | $ | 253 |  |  | $ | 255 |  |  | $ | 480 |  |  | $ | 822 |
__________________________________________________________________________________ (a)Asset derivatives are included in Accrued interest and other assets and liability derivatives are included in Accrued interest and other liabilities in the Company's Consolidated Balance Sheet. (b)The impact of variation margin payments at September 30, 2025 and December 31, 2024 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $379 million and $686 million, respectively, and in a liability position of $33 million and $15 million, respectively.
| Carrying Amount of the Hedged Item |  | Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item
(Dollars in millions) | September 30, 2025 |  | December 31, 2024 |  | September 30, 2025 |  | December 31, 2024
Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges |  |  |  |  |  |  |
Long-term borrowings | $ | 6,092 |  |  | $ | 5,184 |  |  | $ | 5 |  |  | $ | (155) |
Investment securities available for sale |  |  | 381 |  |  |  |  | — |
Information about Fair Values of Derivative Instruments in Consolidated Statement of Income |
| Amount of Gain (Loss) Recognized
| Three Months Ended September 30,
| 2025 |  | 2024
(Dollars in millions) | Derivative |  | Hedged Item |  | Derivative |  | Hedged Item
Derivatives in fair value hedging relationships |  |  |  |  |  |  |
Interest rate swap agreements: |  |  |  |  |  |  |
Fixed rate long-term borrowings (a) | $ | 13 |  |  | $ | (13) |  |  | $ | 130 |  |  | $ | (130) |
Fixed rate investment securities available for sale (b) |  |  |  |  | — |  |  | — |
Total | $ | 13 |  |  | $ | (13) |  |  | $ | 130 |  |  | $ | (130) |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |
Interest rate contracts (c) | $ | 11 |  |  |  |  | $ | 5 |  |  |
Foreign exchange and other option and futures contracts (c) | 5 |  |  |  |  | 5 |  |  |
Total | $ | 16 |  |  |  |  | $ | 10 |  |  |
__________________________________________________________________________________ (a)Reported as an adjustment to Interest expense in the Company's Consolidated Statement of Income. (b)Reported as an adjustment to Interest income in the Company's Consolidated Statement of Income. (c)Included in Trading account and other non-hedging derivative gains in the Company's Consolidated Statement of Income.
| Amount of Gain (Loss) Recognized
| Nine Months Ended September 30,
| 2025 |  | 2024
(Dollars in millions) | Derivative |  | Hedged Item |  | Derivative |  | Hedged Item
Derivatives in fair value hedging relationships |  |  |  |  |  |  |
Interest rate swap agreements: |  |  |  |  |  |  |
Fixed rate long-term borrowings (a) | $ | 160 |  |  | $ | (160) |  |  | $ | 52 |  |  | $ | (52) |
Fixed rate investment securities available for sale (b) |  |  |  |  | — |  |  | — |
Total | $ | 160 |  |  | $ | (160) |  |  | $ | 52 |  |  | $ | (52) |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |
Interest rate contracts (c) | $ | 23 |  |  |  |  | $ | 11 |  |  |
Foreign exchange and other option and futures contracts (c) | 11 |  |  |  |  | 13 |  |  |
Total | $ | 34 |  |  |  |  | $ | 24 |  |  |
__________________________________________________________________________________ (a)Reported as an adjustment to Interest expense in the Company's Consolidated Statement of Income. (b)Reported as an adjustment to Interest income in the Company's Consolidated Statement of Income. (c)Included in Trading account and other non-hedging derivative gains in the Company's Consolidated Statement of Income.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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