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Revenue from contracts with customers (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance The following tables summarize sources of the Company’s noninterest income during the three-month and nine-month periods ended September 30, 2025 and 2024 that are subject to the revenue recognition accounting guidance.
(Dollars in millions)Commercial BankRetail BankInstitutional Services and Wealth ManagementTotal
Three Months Ended September 30, 2025
Classification in Consolidated Statement of Income 
Service charges on deposit accounts$45 $96 $— $141 
Trust income1 — 180 181 
Brokerage services income1 — 33 34 
Other revenues from operations:
Merchant discount and credit card interchange fees20 27 — 47 
Other11 7 2 20 
$78 $130 $215 $423 
Three Months Ended September 30, 2024
Classification in Consolidated Statement of Income
Service charges on deposit accounts$40 $92 $— $132 
Trust income1 — 169 170 
Brokerage services income2 — 30 32 
Other revenues from operations:
Merchant discount and credit card interchange fees18 23 — 41 
Other8 8 3 19 
$69 $123 $202 $394 
(Dollars in millions)Commercial BankRetail BankInstitutional Services and Wealth ManagementTotal
Nine Months Ended September 30, 2025
Classification in Consolidated Statement of Income
Service charges on deposit accounts$133 $278 $— $411 
Trust income3 — 537 540 
Brokerage services income4 — 93 97 
Other revenues from operations:
Merchant discount and credit card interchange fees55 75 — 130 
Other31 22 6 59 
$226 $375 $636 $1,237 
Nine Months Ended September 30, 2024
Classification in Consolidated Statement of Income
Service charges on deposit accounts$120 $263 $— $383 
Trust income3 — 497 500 
Brokerage services income5 — 86 91 
Other revenues from operations:
Merchant discount and credit card interchange fees54 67 — 121 
Other23 23 8 54 
$205 $353 $591 $1,149