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Equity method investments - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]              
Equity method investments   $ 30,065,000,000   $ 30,065,000,000     $ 29,066,000,000
Equity method earnings   $ 252,000,000 $ 511,000,000 $ 745,000,000 $ 1,199,000,000    
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   20.00%   20.00%      
Equity method investments   $ 13,161,000,000   $ 13,161,000,000     13,230,000,000
Equity method earnings   $ 27,000,000 265,000,000 $ 242,000,000 487,000,000    
Occidental Petroleum Corporation [Member]              
Schedule Of Equity Method Investments [Line Items]              
Equity method investment ownership percentage   28.80%   28.80%      
Percentage of excess of carrying values over fair values of investments   2.00%   2.00%      
Equity method investments   $ 16,455,000,000   $ 16,455,000,000     $ 15,410,000,000
Equity method earnings   $ 200,000,000 $ 234,000,000 $ 463,000,000 $ 604,000,000    
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