v3.26.1
Equity method investments - Narrative (Detail) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Dec. 27, 2025
The Kraft Heinz Company [Member]      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 27.50%    
The Kraft Heinz Company [Member] | Common Stock [Member]      
Schedule Of Equity Method Investments [Line Items]      
Percentage of excess of carrying values over fair values of investments 15.70%    
Excess of carrying value over fair value of equity investment $ 1,400,000,000    
Excess of carrying value of investment over investees equity     $ 2,800,000,000
Occidental Petroleum Corporation [Member]      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 26.90%    
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  
Berkadia Commercial Mortgage LLC [Member]      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 50.00%    
Berkadia Commercial Mortgage LLC [Member] | Jefferies Financial Group Inc. [Member]      
Schedule Of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 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