Contingencies and Commitments - Narrative (Detail) $ in Millions		1 Months Ended	12 Months Ended
	Jan. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Store Location	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Other Commitments [Line Items]
Purchase commitments - 2023			$ 12,000
Purchase commitments - 2024			5,000
Purchase commitments - 2025			3,000
Purchase commitments - 2026			2,000
Purchase commitments - 2027			2,000
Purchase commitments - After 2027			18,000
Equity method investments, carrying value			28,050	$ 16,045
Revenues			302,089	276,203	$ 245,579
Earnings before income taxes			(30,576)	111,686	55,693
Assets			948,452	958,784	873,729
Excess consideration paid for acquiring noncontrolling Interest		$ 362
Berkshire Hathaway Energy [Member] | Greg Abel
Other Commitments [Line Items]
Acquisition of outstanding shares, value		$ 870
Berkshire Hathaway Inc. (Parent) [Member]
Other Commitments [Line Items]
Equity method investments, carrying value			12,937	13,112
Revenues			(22,908)	88,658	$ 43,911
Assets			495,384	528,592
Liabilities			23,024	$ 22,393
Pilot Travel Centers LLC [Member]
Other Commitments [Line Items]
Equity method investments, carrying value			$ 3,200
Pilot Travel Centers LLC [Member] | Subsequent Event [Member]
Other Commitments [Line Items]
Percentage of additional interest acquired	41.40%
Consideration for additional interest acquired	$ 8,200
Pilot Travel Centers LLC [Member] | Canadian Provinces [Member]
Other Commitments [Line Items]
Number of places retail locations located | Location			6
Pilot Travel Centers LLC [Member] | U.S. States [Member]
Other Commitments [Line Items]
Number of places retail locations located | Location			44
Pilot Travel Centers LLC [Member] | U.S. and Canada [Member] | Retail Locations [Member] | Minimum [Member]
Other Commitments [Line Items]
Number of retail | Store			150
Pilot Travel Centers LLC [Member] | U.S. and Canada [Member] | Travel Center Locations [Member] | Minimum [Member]
Other Commitments [Line Items]
Number of retail | Store			650
Pilot Travel Centers LLC [Member]
Other Commitments [Line Items]
Equity method investment ownership percentage			38.60%