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Investments in equity securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Summary of Investment Holdings [Line Items]    
Cost Basis $ 83,177 $ 75,506
Net Unrealized Gains 200,064 196,082
Fair Value 283,241 271,588
Banks, insurance and finance [Member]    
Summary of Investment Holdings [Line Items]    
Cost Basis 14,966 15,707
Net Unrealized Gains 82,006 75,936
Fair Value 96,972 91,643
Consumer products [Member]    
Summary of Investment Holdings [Line Items]    
Cost Basis 12,198 12,658
Net Unrealized Gains 80,191 92,091
Fair Value 92,389 104,749
Commercial, industrial and other [Member]    
Summary of Investment Holdings [Line Items]    
Cost Basis 56,013 47,141
Net Unrealized Gains 37,867 28,055
Fair Value $ 93,880 $ 75,196