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Investment gains (losses) - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Jan. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Sales of equity securities | $ 19,972 | $ 13,283 |
Taxable gains (losses) on sales of equity securities | $ 14,200 | 2,200 |
Pilot Travel Centers LLC [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Non-cash gain from remeasurement |  | $ 3,000 |
Equity interest ownership percentage |  | 38.60% | 38.60%

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