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Equity method investments - Narrative (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Aug. 04, 2022
Schedule Of Equity Method Investments [Line Items]            
Equity method investments   $ 31,134,000,000 $ 29,066,000,000      
Equity method earnings   $ 1,841,000,000 1,973,000,000 $ 1,863,000,000    
The Kraft Heinz Company [Member]            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment ownership percentage   27.20%        
Percentage of excess of carrying values over fair values of investments   25.00%        
Equity method investments   $ 13,395,000,000 13,230,000,000      
Equity method earnings   $ 745,000,000 758,000,000 628,000,000    
Berkadia Commercial Mortgage LLC [Member]            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment ownership percentage   50.00%        
Berkadia Commercial Mortgage LLC [Member] | Commercial Paper [Member]            
Schedule Of Equity Method Investments [Line Items]            
Maximum outstanding balance of commercial paper borrowings   $ 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%        
Pilot Travel Centers LLC [Member]            
Schedule Of Equity Method Investments [Line Items]            
Equity method earnings $ 105,000,000          
Occidental Petroleum Corporation [Member]            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment ownership percentage   28.20%        
Percentage of excess of carrying values over fair values of investments   25.00%        
Equity method investments   $ 17,287,000,000 15,410,000,000      
Equity method earnings   $ 1,005,000,000 $ 1,077,000,000 $ 323,000,000    
Occidental Petroleum Corporation [Member] | Common Stock [Member]            
Schedule Of Equity Method Investments [Line Items]            
Excess of carrying value of investment over investees equity         $ 9,900,000,000  
Occidental Petroleum Corporation [Member] | Occidental Common Stock [Member] | Minimum [Member]            
Schedule Of Equity Method Investments [Line Items]            
Equity method investment ownership percentage           20.00%