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Equity method investments - Narrative (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 29,066,000,000 | $ 28,050,000,000 |  |
Equity method earnings | $ 1,973,000,000 | 1,863,000,000 | $ 886,000,000 |
The Kraft Heinz Company [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percentage | 26.70% |  |  |
Percentage of excess of carrying values over fair values of investments | 9.00% |  |  |
Equity method investments | $ 13,230,000,000 | 12,937,000,000 |  |
Equity method earnings | $ 758,000,000 | 628,000,000 | 269,000,000 |
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 investments |  | 3,200,000,000 |  |
Equity method earnings | $ 105,000,000 | 812,000,000 | $ 474,000,000 |
Occidental Petroleum Corporation [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percentage | 27.80% |  |  |
Percentage of excess of carrying values over fair values of investments | 6.00% |  |  |
Equity method investments | $ 15,410,000,000 | 11,484,000,000 |  |
Equity method earnings | $ 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 |  |  |  | $ 9,600,000,000

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