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Derivative financial instruments (Tables)
 9 Months Ended
Sep. 30, 2024
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 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, 2024 
Fair value hedges: 
Fixed rate long-term borrowings (b) (d)$3,850 5.43.48 %5.06 %$(8)
Fixed rate investment securities available for sale (c)15 0.34.84 4.86 — 
Cash flow hedges:
Interest payments on variable rate commercial real estate and commercial
   and industrial loans (b) (e)		26,705 1.53.39 5.02 (30)
Total$30,570 2.0$(38)
December 31, 2023
Fair value hedges:
Fixed rate long-term borrowings (b) (f)$3,000 5.83.45 %5.62 %$(1)
Cash flow hedges:
Interest payments on variable rate commercial real estate loans (b) (g)23,977 1.73.45 5.36 11 
Total$26,977 2.2$10 
_______________________________________________________________
(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 $15 million at September 30, 2024 and of losses of $43 million at December 31, 2023. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of gains of $89 million at September 30, 2024 and of losses of $214 million at December 31, 2023.
(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 $1.9 billion of forward-starting interest rate swap agreements that become effective in 2025.
(e)Includes notional amount and terms of $6.6 billion of forward-starting interest rate swap agreements that become effective in 2024, 2025 and 2026.
(f)Includes notional amount and terms of $1.0 billion of forward-starting interest rate swap agreements that become effective in 2025.
(g)Includes notional amount and terms of $9.0 billion of forward-starting interest rate swap agreements that become effective in 2024.
Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet
Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows:
 Asset DerivativesLiability Derivatives
 Fair ValueFair Value
(Dollars in millions)September 30,
2024		December 31,
2023		September 30,
2024		December 31,
2023
Derivatives designated and qualifying as hedging instruments (a)    
Interest rate swap agreements$— $12 $38 $2 
Commitments to sell real estate loans1 6 17 8 
 1 18 55 10 
Derivatives not designated and qualifying as hedging instruments (a)    
Mortgage banking:    
Mortgage-related commitments to originate real estate loans for sale29 15 21 32 
Commitments to sell real estate loans24 35 19 3 
 53 50 40 35 
Other:    
Interest rate contracts (b)218 237 571 879 
Foreign exchange and other option and futures contracts14 19 13 19 
 232 256 584 898 
Total derivatives$286 $324 $679 $943 
_______________________________________________________________
(a)Asset derivatives are reported in "accrued interest and other assets" and liability derivatives are reported in "accrued interest and other liabilities" in the Consolidated Balance Sheet.
(b)The impact of variation margin payments at September 30, 2024 and December 31, 2023 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $496 million and $783 million, respectively, as of each period end, and in a liability position of $51 million and $32 million, respectively.
Carrying Amount of the Hedged ItemCumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying
Amount of the Hedged Item
(Dollars in millions)September 30,
2024		December 31, 2023September 30,
2024		December 31, 2023
Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges
Long-term borrowings$3,853 $2,954 $8 $(44)
Investment securities available for sale 391 — 
Information about Fair Values of Derivative Instruments in Consolidated Statement of Income
Amount of Gain (Loss) Recognized
Three Months Ended September 30,
20242023
(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)$130 $(130)$(61)$61 
Fixed rate investment securities available for sale (b)— — 
Total$130 $(130)$(61)$61 
Derivatives not designated as hedging instruments
Interest rate contracts (c)$5 $6 
Foreign exchange and other option and futures contracts (c)5 4 
Total$10 $10 
Amount of Gain (Loss) Recognized
Nine Months Ended September 30,
20242023
(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)$52 $(52)$(95)$96 
Fixed rate investment securities available for sale (b)— — 
Total$52 $(52)$(95)$96 
Derivatives not designated as hedging instruments
Interest rate contracts (c)$11 $25 
Foreign exchange and other option and futures contracts (c)13 11 
Total$24 $36 
_______________________________________________________________
(a)Reported as an adjustment to "interest expense" in the Consolidated Statement of Income.
(b)Reported as an adjustment to "interest income" in the Consolidated Statement of Income.
(c)Reported as "trading account and other non-hedging derivative gains" in the Consolidated Statement of Income.