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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 |  |  |  |  |  |

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