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Notes payable and other borrowings - Narrative (Detail) € in Millions, £ in Millions, $ in Millions, ¥ in Billions	1 Months Ended		3 Months Ended
	Apr. 30, 2024 USD ($)	Apr. 30, 2024 JPY (¥)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 JPY (¥)	Mar. 31, 2024 EUR (€)	Mar. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Notes payable and other borrowings					¥ 1,259.0	€ 5,850	£ 1,750
Line of Credit and Commercial Paper Facilities [Member] \| Subsidiaries [Member]
Debt Instrument [Line Items]
Unused lines of credit available			$ 9,900
Line of Credit and Commercial Paper Facilities [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy and Subsidiaries [Member]
Debt Instrument [Line Items]
Unused lines of credit available			8,700
Insurance and Other [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings			40,723					$ 42,692
Insurance and Other [Member] \| Berkshire Hathaway Inc. (Parent) [Member] \| Subsidiaries Excluding Berkshire Hathaway Finance Corporation [Member]
Debt Instrument [Line Items]
Guarantee obligation			$ 2,700
Insurance and Other [Member] \| Subsidiaries [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage			4.50%		4.50%	4.50%	4.50%
Notes payable and other borrowings			$ 4,649					4,696
Insurance and Other [Member] \| Senior Notes [Member] \| Berkshire Hathaway Inc. (Parent) [Member]
Debt Instrument [Line Items]
Repayments of borrowings			1,100
Insurance and Other [Member] \| Senior Notes [Member] \| Berkshire Hathaway Inc. (Parent) [Member] \| Berkshire Hathaway Finance Corporation [Member]
Debt Instrument [Line Items]
Gains (loss) attributable to changes in foreign currency exchange rates			$ 781	$ (26)
Insurance and Other [Member] \| Senior Notes [Member] \| Debt Due 2027 to 2054 [Member] \| Berkshire Hathaway Inc. (Parent) [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount of debt issued	$ 1,700	¥ 263.3
Insurance and Other [Member] \| Minimum [Member] \| Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2024
Insurance and Other [Member] \| Minimum [Member] \| Senior Notes [Member] \| Debt Due 2027 to 2054 [Member] \| Berkshire Hathaway Inc. (Parent) [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate during period	0.974%	0.974%
Debt maturity year	2027	2027
Insurance and Other [Member] \| Maximum [Member] \| Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2051
Insurance and Other [Member] \| Maximum [Member] \| Senior Notes [Member] \| Debt Due 2027 to 2054 [Member] \| Berkshire Hathaway Inc. (Parent) [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate during period	2.498%	2.498%
Debt maturity year	2054	2054
Railroad, Utilities and Energy [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings			$ 82,031					85,579
Railroad, Utilities and Energy [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy ("BHE") [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage			4.40%		4.40%	4.40%	4.40%
Railroad, Utilities and Energy [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage			4.60%		4.60%	4.60%	4.60%
Notes payable and other borrowings			$ 43,924					39,072
Railroad, Utilities and Energy [Member] \| Subsidiaries [Member] \| Pilot Travel Centers And Subsidiaries [Member]
Debt Instrument [Line Items]
Proceeds from borrowings			$ 5,700
Weighted average interest rate, percentage			0.00%		0.00%	0.00%	0.00%
Notes payable and other borrowings								$ 5,776
Railroad, Utilities and Energy [Member] \| Term Debt [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy and Subsidiaries [Member]
Debt Instrument [Line Items]
Repayments of short-term borrowings			$ 2,600
Railroad, Utilities and Energy [Member] \| Term Debt [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Principal amount of debt issued			$ 5,100
Weighted average interest rate, percentage			5.40%		5.40%	5.40%	5.40%
Railroad, Utilities and Energy [Member] \| Minimum [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy ("BHE") [Member]
Debt Instrument [Line Items]
Debt maturity year			2025
Railroad, Utilities and Energy [Member] \| Minimum [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2024
Railroad, Utilities and Energy [Member] \| Minimum [Member] \| Term Debt [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2029
Railroad, Utilities and Energy [Member] \| Maximum [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy ("BHE") [Member]
Debt Instrument [Line Items]
Debt maturity year			2053
Railroad, Utilities and Energy [Member] \| Maximum [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2064
Railroad, Utilities and Energy [Member] \| Maximum [Member] \| Term Debt [Member] \| Subsidiaries [Member] \| Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Debt maturity year			2055