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Equity method investments - Narrative (Detail) - USD ($) | 3 Months Ended |
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Jun. 30, 2025 | Mar. 31, 2025
The Kraft Heinz Company [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 27.40% |
Equity method investments, pre-tax impairment loss | $ 5,000,000,000 |
Occidental Petroleum Corporation [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Equity method investment ownership percentage | 28.10% |
Occidental Petroleum Corporation [Member] | Common Stock [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Percentage of excess of carrying values over fair values of investments | 32.00% |
Excess of carrying value over fair value of equity investment | $ 5,300,000,000 |
Excess of carrying value of investment over investees equity |  | $ 9,000,000,000
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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