v3.25.4
Equity method investments - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2025
Jun. 30, 2025
Sep. 30, 2025
Dec. 31, 2025
Schedule Of Equity Method Investments [Line Items]        
Equity method investments, pre-tax impairment loss       $ 10,681,000,000
The Kraft Heinz Company [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 27.50%     27.50%
Equity method investments, pre-tax impairment loss   $ 5,000,000,000    
Excess of equity method carrying value   $ 5,000,000,000 $ 2,400,000,000  
Equity in net earnings of impairment loss after tax     8,700,000,000  
Berkadia Commercial Mortgage LLC [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 50.00%     50.00%
Berkadia Commercial Mortgage LLC [Member] | Commercial Paper [Member]        
Schedule Of Equity Method Investments [Line Items]        
Maximum outstanding balance of commercial paper borrowings $ 1,500,000,000     $ 1,500,000,000
Berkadia Commercial Mortgage LLC [Member] | Jefferies Financial Group Inc. [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 50.00%     50.00%
Occidental Petroleum Corporation [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity method investment ownership percentage 26.90%     26.90%
Equity method investments, pre-tax impairment loss $ 5,700,000,000      
Occidental Petroleum Corporation [Member] | Common Stock [Member]        
Schedule Of Equity Method Investments [Line Items]        
Excess of carrying value of investment over investees equity     $ 3,400,000,000