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Investment gains (losses) - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jan. 31, 2023
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Sales of equity securities |  |  | $ 97,123 | $ 25,833 |
Taxable gains (losses) on sales of equity securities | $ 59,600 | $ 2,400 | $ 73,700 | 4,600 |
Pilot Travel Centers LLC [Member] |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Non-cash gain from remeasurement |  |  |  | $ 3,000 |
Equity interest ownership percentage |  | 38.60% |  | 38.60% | 38.60%

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