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Contingencies and commitments - Narrative (Details) $ in Millions						1 Months Ended								2 Months Ended	3 Months Ended	9 Months Ended		15 Months Ended	61 Months Ended
	Oct. 02, 2025 USD ($)	Jul. 28, 2025 Plaintiff	Oct. 31, 2023 USD ($) Cases	Jul. 29, 2022 a Structure People	Aug. 16, 2020 a Wildfire	Oct. 31, 2025 USD ($) Plaintiff	Dec. 31, 2024 USD ($) Plaintiff	Sep. 30, 2024 USD ($)	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Jun. 30, 2023 USD ($) Plaintiff	Nov. 30, 2021 USD ($)	Sep. 30, 2020 a Structure	Oct. 31, 2024 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) Cases Damage	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)
Pilot [Member]
Commitments and Contingencies [Line Items]
Remaining noncontrolling interests acquired										$ 2,600
OxyChem [Member] \| Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Cash consideration to acquire business	$ 9,700
BHE [Member] \| Common Class B [Member]
Commitments and Contingencies [Line Items]
Number of shares exchanged \| shares														2,291,631
Value of shares exchanged														$ 1,045
Berkshire Hathaway Energy [Member]
Commitments and Contingencies [Line Items]
Percentage of outstanding common stock repurchased								5.85%									5.85%
Consideration for repurchase of common stock held by noncontrolling shareholders								$ 2,900
Berkshire Hathaway Energy [Member] \| HomeServices of America [Member] \| Antitrust Cases [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount																$ 9,000
Number of cases \| Cases																2
Berkshire Hathaway Energy [Member] \| HomeServices of America [Member] \| Antitrust Burnett Case [Member]
Commitments and Contingencies [Line Items]
Loss contingency, awarded value			$ 1,800
Legal settlements amount paid																		$ 67
Litigation settlement, scheduled payments term									4 years
Settlement payments to be paid									$ 250
Number of cases \| Cases			1
NICO [Member]
Commitments and Contingencies [Line Items]
Loss contingency accrual								535
Net loss contingency accrual								490
Loss contingency recoverable from a third party, received								$ 45
PacifiCorp [Member] \| Wildfires [Member]
Commitments and Contingencies [Line Items]
Estimated pre-tax probable loss															$ 2,850	$ 2,850			$ 2,850
Legal settlements amount paid																			1,400
Unpaid estimated liability															1,450	1,450			$ 1,450
Loss contingency accrual															$ 100	100	$ 251
Insurance recoveries																530
PacifiCorp [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount																55,000
PacifiCorp [Member] \| 2020 Wildfires, Economic and Noneconomic Damages [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount																$ 52,000
PacifiCorp [Member] \| 2022 Wildfire [Member]
Commitments and Contingencies [Line Items]
Number of structures destroyed \| Structure				185
Number of structures damaged \| Structure				11
Number of injuries in wildfire \| People				12
Number of fatalities in wildfire \| People				4
PacifiCorp [Member] \| Beachie Creek Fire [Member]
Commitments and Contingencies [Line Items]
Number of fires caused \| Wildfire					12
Number of acres burned \| a					193,000
PacifiCorp [Member] \| South Obenchain Fire [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a													33,000
PacifiCorp [Member] \| Echo Mountain Complex Fire [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a													3,000
PacifiCorp [Member] \| 242 Fire [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a													14,000
PacifiCorp [Member] \| Santiam Canyon Fires [Member]
Commitments and Contingencies [Line Items]
Number of fires caused \| Wildfire					7
PacifiCorp [Member] \| James Case Multnomah County Circuit Court [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of named plaintiffs \| Plaintiff		2,000
Number of additional damages phase trials \| Damage																9
Loss contingency estimates for additional damage expected											$ 497
PacifiCorp [Member] \| James Case Multnomah County Circuit Court [Member] \| 2020 Wildfires [Member] \| Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Number of named plaintiffs \| Plaintiff						1,700
Multiplier used to determine economic and non-economic damages						0.25
PacifiCorp [Member] \| James Case Multnomah County Circuit Court [Member] \| Economic Damages [Member] \| Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount						$ 5
PacifiCorp [Member] \| James Case Multnomah County Circuit Court [Member] \| Non-Economic Damages [Member] \| Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount						$ 25
PacifiCorp [Member] \| James Case Multnomah County Circuit All Trials [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Loss contingency, accrual interest rate																9.00%
PacifiCorp [Member] \| James Case Multnomah County Circuit Court First Trial [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of named plaintiffs \| Plaintiff											17
Multiplier used to determine economic and non-economic damages											0.25
PacifiCorp [Member] \| James Case Multnomah County Circuit Court First Trial [Member] \| Economic Damages [Member]
Commitments and Contingencies [Line Items]
Amount of damages awarded to plaintiffs											$ 92
PacifiCorp [Member] \| James Case Multnomah County Circuit Additional Trials [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of additional plaintiffs \| Plaintiff							1,500
PacifiCorp [Member] \| Minimum [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a													500,000
Loss contingency, sought amount							$ 900
Number of structures destroyed \| Structure													2,000
PacifiCorp [Member] \| Minimum [Member] \| 2022 Wildfire [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a				60,000
PacifiCorp [Member] \| Minimum [Member] \| James Case Multnomah County Circuit Court [Member] \| Economic Damages [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount												$ 600
PacifiCorp [Member] \| Minimum [Member] \| James Case Multnomah County Circuit Court [Member] \| Non-Economic Damages [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount												$ 1,000
Berkshire Hathaway Inc. (Parent) [Member] \| BHE [Member]
Commitments and Contingencies [Line Items]
Percentage of outstanding common stock repurchased														2.12%