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Variable interest entities and asset securitizations - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Other assets for its "investment" in the common securities recognized by the company of various trusts $ 16   $ 16   $ 17
Total assets of partnerships in which the company invested 211,277   211,277   208,105
Variable Interest Entity Primary Beneficiary          
Total assets of partnerships in which the company invested 10,600   10,600   $ 10,500
Federal tax credits and other federal tax benefits recognized 9 $ 10 29 $ 25  
Investments amortized to income tax expense 49 47 138 135  
Maximum exposure to loss of investments in real estate partnerships 2,200   2,200    
Variable Interest Entity Primary Beneficiary | Renewable Energy          
Federal tax credits and other federal tax benefits recognized $ 1 $ 8      
Investments amortized to income tax expense     $ 13 $ 28