v3.25.2
Equity method investments - Narrative (Detail) - USD ($)
3 Months Ended
Jun. 30, 2025
Mar. 31, 2025
The Kraft Heinz Company [Member]    
Schedule Of Equity Method Investments [Line Items]    
Equity method investment ownership percentage 27.40%  
Equity method investments, pre-tax impairment loss $ 5,000,000,000  
Occidental Petroleum Corporation [Member]    
Schedule Of Equity Method Investments [Line Items]    
Equity method investment ownership percentage 28.10%  
Occidental Petroleum Corporation [Member] | Common Stock [Member]    
Schedule Of Equity Method Investments [Line Items]    
Percentage of excess of carrying values over fair values of investments 32.00%  
Excess of carrying value over fair value of equity investment $ 5,300,000,000  
Excess of carrying value of investment over investees equity   $ 9,000,000,000
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