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Equity method investments - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]              
Equity method investments   $ 30,133,000,000   $ 30,133,000,000     $ 29,066,000,000
Equity method earnings   $ 222,000,000 $ 262,000,000 $ 967,000,000 $ 1,461,000,000    
The Kraft Heinz Company [Member]              
Schedule Of Equity Method Investments [Line Items]              
Equity method investment ownership percentage   26.90%   26.90%      
Percentage of excess of carrying values over fair values of investments   12.00%   12.00%      
Equity method investments   $ 13,008,000,000   $ 13,008,000,000     13,230,000,000
Equity method earnings   $ (78,000,000) 69,000,000 $ 164,000,000 556,000,000    
Occidental Petroleum Corporation [Member]              
Schedule Of Equity Method Investments [Line Items]              
Equity method investment ownership percentage   28.20%   28.20%      
Percentage of excess of carrying values over fair values of investments   21.00%   21.00%      
Equity method investments   $ 16,672,000,000   $ 16,672,000,000     $ 15,410,000,000
Equity method earnings   $ 277,000,000 $ 169,000,000 $ 740,000,000 $ 773,000,000    
Occidental Petroleum Corporation [Member] | Common Stock [Member]              
Schedule Of Equity Method Investments [Line Items]              
Excess of carrying value of investment over investees equity           $ 10,000,000,000  
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] | Jefferies Financial Group Inc. [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      
Pilot Travel Centers LLC [Member]              
Schedule Of Equity Method Investments [Line Items]              
Equity method earnings $ 105,000,000