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Segment information (Tables)
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Information about Company's Segments
Information about the Company's segments follows:
Three Months Ended September 30,
20242023
(Dollars in millions)Total
Revenues(a)
Inter-
segment
Revenues
Net
Income
(Loss)
Total Average AssetsTotal
Revenues(a)
Inter-
segment
Revenues
Net
Income
(Loss)
Total Average Assets
Commercial Bank$723 $— $239 $80,434 $738 $1 $251 $80,473 
Retail Bank1,292 — 446 53,128 1,307 — 473 51,024 
Institutional Services and Wealth
   Management		389 4 137 3,898 363 3 120 3,664 
All Other(72)(4)(101)72,121 (73)(4)(154)70,630 
Total$2,332 $— $721 $209,581 $2,335 $— $690 $205,791 

Nine Months Ended September 30,
20242023
(Dollars in millions)
Total
Revenues(a)
Inter-
segment
Revenues
Net
Income
(Loss)
Total Average Assets
Total
Revenues(a)
Inter-
segment
Revenues
Net
Income
(Loss)
Total Average Assets
Commercial Bank$2,139 $4 $645 $80,903 $2,308 $4 $819 $80,169 
Retail Bank3,854 — 1,364 52,771 3,837 — 1,400 51,124 
Institutional Services and Wealth
   Management		1,167 10 409 3,735 1,344 9 515 3,680 
All Other(266)(14)(511)73,599 (146)(13)(475)69,293 
Total$6,894 $— $1,907 $211,008 $7,343 $— $2,259 $204,266 
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(a)Total revenues are comprised of net interest income and other income. Net interest income is the difference between taxable-equivalent interest earned on assets and interest paid on liabilities owed by a segment and a funding charge (credit) based on the Company's internal funds transfer and allocation methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated $13 million and $15 million for the three-month periods ended September 30, 2024 and 2023, respectively, and $38 million and $41 million for the nine-month periods ended September 30, 2024 and 2023, respectively, and is eliminated in "All Other" total revenues.