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Investment gains (losses) - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jan. 31, 2023
Gain (Loss) on Securities [Line Items]          
Sales of equity securities     $ 133,218 $ 32,786  
Taxable gains (losses) on sales of equity securities $ 23,400 $ 759 $ 97,100 5,400  
Pilot Travel Centers LLC [Member]          
Gain (Loss) on Securities [Line Items]          
Non-cash gain from remeasurement       $ 3,000  
Equity interest ownership percentage         38.60%