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Equity method investments - Narrative (Detail) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
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The Kraft Heinz Company [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 27.30% |
Percentage of excess of carrying values over fair values of investments | 27.00% |
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 | 24.00% |
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
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 |

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