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Contingencies and commitments - Narrative (Details)				1 Months Ended							2 Months Ended	3 Months Ended	6 Months Ended	10 Months Ended	14 Months Ended	15 Months Ended	42 Months Ended	58 Months Ended
Contingencies and commitments - Narrative (Details)	Oct. 31, 2023 USD ($) Cases	Jul. 29, 2022 a People Structure	Aug. 16, 2020 a Wildfire	Dec. 31, 2024 USD ($) Complaint 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	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) Cases	Jan. 31, 2025 Plaintiff	May 31, 2025 Complaint Plaintiff	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)
Pilot [Member]
Commitments and Contingencies [Line Items]
Remaining noncontrolling interests acquired							$ 2,600,000,000
BHE [Member] \| Common Class B [Member]
Commitments and Contingencies [Line Items]
Number of shares exchanged \| shares											2,291,631
Value of shares exchanged											$ 1,045,000,000.000
Berkshire Hathaway Energy [Member]
Commitments and Contingencies [Line Items]
Percentage of outstanding common stock repurchased					5.85%
Consideration for repurchase of common stock held by noncontrolling shareholders					$ 2,900,000,000
Berkshire Hathaway Energy [Member] \| HomeServices of America [Member] \| Antitrust Cases [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount													$ 9,000,000,000
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	$ 1,800,000,000
Legal settlements amount paid																$ 67,000,000
Litigation settlement, scheduled payments term						4 years
Settlement payments to be paid						$ 250,000,000
Number of cases \| Cases	1
NICO [Member]
Commitments and Contingencies [Line Items]
Loss contingency accrual					535,000,000
Net loss contingency accrual					490,000,000
Loss contingency recoverable from a third party, received					$ 45,000,000
PacifiCorp [Member] \| Wildfires [Member]
Commitments and Contingencies [Line Items]
Estimated pre-tax probable loss													$ 2,750,000,000			2,750,000,000	$ 2,750,000,000	$ 2,750,000,000
Legal settlements amount paid																		1,370,000,000
Unpaid estimated liability													1,380,000,000			$ 1,380,000,000	1,380,000,000	$ 1,380,000,000
Loss contingency accrual												$ 251,000,000	0
Insurance recoveries																	$ 530,000,000
PacifiCorp [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount													54,000,000,000
PacifiCorp [Member] \| 2020 Wildfires, Economic and Noneconomic Damages [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount													$ 51,000,000,000
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														1,690
Number of additional plaintiffs \| Plaintiff				8
Number of complaints \| Complaint															7
Number of plaintiffs dismissed \| Plaintiff															10
Number of additional complaints filed \| Complaint				2
Loss contingency estimates for additional damage expected								$ 370,000,000
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								$ 93,000,000
PacifiCorp [Member] \| Minimum [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of acres burned \| a										500,000
Loss contingency, sought amount				$ 900,000,000
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									$ 600,000,000
PacifiCorp [Member] \| Minimum [Member] \| James Case Multnomah County Circuit Court [Member] \| Non-Economic Damages [Member]
Commitments and Contingencies [Line Items]
Loss contingency, sought amount									$ 1,000,000,000
PacifiCorp [Member] \| Maximum [Member] \| James Case Multnomah County Circuit Additional Trials [Member] \| 2020 Wildfires [Member]
Commitments and Contingencies [Line Items]
Number of plaintiffs per trial \| Plaintiff								11
Berkshire Hathaway Inc. (Parent) [Member] \| BHE [Member]
Commitments and Contingencies [Line Items]
Percentage of outstanding common stock repurchased											2.12%