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Variable interest entities and asset securitizations (Tables)
12 Months Ended
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities Information on the Company's carrying amount of its investments in tax equity partnerships and its related future funding commitments are presented in the following table:
December 31,
(Dollars in millions)20242023
Affordable housing projects:
Carrying amount (a)$1,384 $1,340 
Amount of future funding commitments included in carrying amount (b)467 410 
Contingent commitments69 55 
Renewable energy:
Carrying amount (a)135 80 
Amount of future funding commitments included in carrying amount (b)46 31 
Other:
Carrying amount (a)37 41 
Amount of future funding commitments included in carrying amount (b)— — 
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(a)Included in Accrued interest and other assets in the Consolidated Balance Sheet.
(b)Included in Accrued interest and other liabilities in the Consolidated Balance Sheet.