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Significant business acquisitions - Narrative (Detail) $ in Millions |  |  |  | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2023 USD ($) | Jan. 31, 2023 USD ($) | Oct. 19, 2022 USD ($) | Jan. 31, 2024 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) Store Location | Dec. 31, 2023 USD ($) Store Location | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Aug. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 254,906 | $ 207,771 | $ 191,252 |
Net Income (Loss) |  |  |  |  |  |  | $ 96,223 | $ (22,759) | $ 89,937 |
Alleghany Corporation [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, effective date of acquisition |  |  | Oct. 19, 2022 |  |  |  |  |  |  |
Business acquisition, cash consideration |  |  | $ 11,500 |  |  |  |  |  |  |
Pilot Travel Centers LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of additional interest acquired |  | 41.40% |  |  |  |  |  |  |  |
Business acquisition, cash consideration |  | $ 8,200 |  |  |  |  |  |  |  |
Economic interest |  | 38.60% |  |  | 38.60% | 38.60% | 38.60% |  |  |
Economic interest after subsequent acquisition |  | 80.00% |  |  | 80.00% |  |  |  |  |
Revenues |  |  |  |  |  | $ 51,700 |  |  |  |
Net Income (Loss) |  |  |  |  |  | $ 603 |  |  |  |
One-time, non-cash remeasurement gain recognized |  |  |  |  | $ 3,000 |  |  |  |  |
Pilot Travel Centers LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, cash consideration |  |  |  | $ 2,600 |  |  |  |  |  |
Economic interest after subsequent acquisition |  |  |  | 100.00% |  |  |  |  |  |
Pilot Travel Centers LLC [Member] | U.S. and Canada [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of fuel only retail locations | Location |  |  |  |  |  | 75 | 75 |  |  |
Pilot Travel Centers LLC [Member] | Travel Center Locations [Member] | U.S. States [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of places retail locations located | Location |  |  |  |  |  | 44 | 44 |  |  |
Pilot Travel Centers LLC [Member] | Travel Center Locations [Member] | Canadian Provinces [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of places retail locations located | Location |  |  |  |  |  | 5 | 5 |  |  |
Pilot Travel Centers LLC [Member] | Minimum [Member] | Travel Center Locations [Member] | U.S. and Canada [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of retail | Store |  |  |  |  |  | 650 | 650 |  |  |
Berkshire Hathaway Energy [Member] | Cove Point LNG LP [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, effective date of acquisition | Sep. 01, 2023 |  |  |  |  |  |  |  |  |
Business acquisition, cash consideration | $ 3,300 |  |  |  |  |  |  |  |  |
Excess consideration paid for acquiring noncontrolling Interest | $ 667 |  |  |  |  |  |  |  |  |
Berkshire Hathaway Energy [Member] | Cove Point LNG LP [Member] | General Partner [Member] | Cove Point [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Economic interest | 100.00% |  |  |  |  |  |  |  |  |
Berkshire Hathaway Energy [Member] | Cove Point LNG LP [Member] | Limited Partner [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of additional interest acquired | 50.00% |  |  |  |  |  |  |  |  |
Economic interest |  |  |  |  |  |  |  |  |  | 25.00%
Economic interest after subsequent acquisition | 75.00% |  |  |  |  |  |  |  |  |

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